initial commit

2026-08-19 11:03:29 +05:30
commit 3914e4f304
23 changed files with 3050 additions and 0 deletions
--- a/.gitattributes
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,33 @@
+HELP.md
+target/
+.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
--- a/.mvn/wrapper/maven-wrapper.properties
+++ b/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,3 @@
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.16/apache-maven-3.9.16-bin.zip
--- a/APIforIMS.md
+++ b/APIforIMS.md
--- a/295
+++ b/295
@@ -0,0 +1,295 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.3.4
+#
+# Optional ENV vars
+# -----------------
+#   JAVA_HOME - location of a JDK home dir, required when download maven via java source
+#   MVNW_REPOURL - repo url base for downloading maven distribution
+#   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+#   MVNW_VERBOSE - true: enable verbose log; debug: trace the mvnw script; others: silence the output
+# ----------------------------------------------------------------------------
+
+set -euf
+[ "${MVNW_VERBOSE-}" != debug ] || set -x
+
+# OS specific support.
+native_path() { printf %s\\n "$1"; }
+case "$(uname)" in
+CYGWIN* | MINGW*)
+  [ -z "${JAVA_HOME-}" ] || JAVA_HOME="$(cygpath --unix "$JAVA_HOME")"
+  native_path() { cygpath --path --windows "$1"; }
+  ;;
+esac
+
+# set JAVACMD and JAVACCMD
+set_java_home() {
+  # For Cygwin and MinGW, ensure paths are in Unix format before anything is touched
+  if [ -n "${JAVA_HOME-}" ]; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ]; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+      JAVACCMD="$JAVA_HOME/jre/sh/javac"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+      JAVACCMD="$JAVA_HOME/bin/javac"
+
+      if [ ! -x "$JAVACMD" ] || [ ! -x "$JAVACCMD" ]; then
+        echo "The JAVA_HOME environment variable is not defined correctly, so mvnw cannot run." >&2
+        echo "JAVA_HOME is set to \"$JAVA_HOME\", but \"\$JAVA_HOME/bin/java\" or \"\$JAVA_HOME/bin/javac\" does not exist." >&2
+        return 1
+      fi
+    fi
+  else
+    JAVACMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v java
+    )" || :
+    JAVACCMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v javac
+    )" || :
+
+    if [ ! -x "${JAVACMD-}" ] || [ ! -x "${JAVACCMD-}" ]; then
+      echo "The java/javac command does not exist in PATH nor is JAVA_HOME set, so mvnw cannot run." >&2
+      return 1
+    fi
+  fi
+}
+
+# hash string like Java String::hashCode
+hash_string() {
+  str="${1:-}" h=0
+  while [ -n "$str" ]; do
+    char="${str%"${str#?}"}"
+    h=$(((h * 31 + $(LC_CTYPE=C printf %d "'$char")) % 4294967296))
+    str="${str#?}"
+  done
+  printf %x\\n $h
+}
+
+verbose() { :; }
+[ "${MVNW_VERBOSE-}" != true ] || verbose() { printf %s\\n "${1-}"; }
+
+die() {
+  printf %s\\n "$1" >&2
+  exit 1
+}
+
+trim() {
+  # MWRAPPER-139:
+  #   Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
+  #   Needed for removing poorly interpreted newline sequences when running in more
+  #   exotic environments such as mingw bash on Windows.
+  printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+scriptDir="$(dirname "$0")"
+scriptName="$(basename "$0")"
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+  case "${key-}" in
+  distributionUrl) distributionUrl=$(trim "${value-}") ;;
+  distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+  esac
+done <"$scriptDir/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+
+case "${distributionUrl##*/}" in
+maven-mvnd-*bin.*)
+  MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/
+  case "${PROCESSOR_ARCHITECTURE-}${PROCESSOR_ARCHITEW6432-}:$(uname -a)" in
+  *AMD64:CYGWIN* | *AMD64:MINGW*) distributionPlatform=windows-amd64 ;;
+  :Darwin*x86_64) distributionPlatform=darwin-amd64 ;;
+  :Darwin*arm64) distributionPlatform=darwin-aarch64 ;;
+  :Linux*x86_64*) distributionPlatform=linux-amd64 ;;
+  *)
+    echo "Cannot detect native platform for mvnd on $(uname)-$(uname -m), use pure java version" >&2
+    distributionPlatform=linux-amd64
+    ;;
+  esac
+  distributionUrl="${distributionUrl%-bin.*}-$distributionPlatform.zip"
+  ;;
+maven-mvnd-*) MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/ ;;
+*) MVN_CMD="mvn${scriptName#mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${MVNW_REPOURL-}" ] || distributionUrl="$MVNW_REPOURL$_MVNW_REPO_PATTERN${distributionUrl#*"$_MVNW_REPO_PATTERN"}"
+distributionUrlName="${distributionUrl##*/}"
+distributionUrlNameMain="${distributionUrlName%.*}"
+distributionUrlNameMain="${distributionUrlNameMain%-bin}"
+MAVEN_USER_HOME="${MAVEN_USER_HOME:-${HOME}/.m2}"
+MAVEN_HOME="${MAVEN_USER_HOME}/wrapper/dists/${distributionUrlNameMain-}/$(hash_string "$distributionUrl")"
+
+exec_maven() {
+  unset MVNW_VERBOSE MVNW_USERNAME MVNW_PASSWORD MVNW_REPOURL || :
+  exec "$MAVEN_HOME/bin/$MVN_CMD" "$@" || die "cannot exec $MAVEN_HOME/bin/$MVN_CMD"
+}
+
+if [ -d "$MAVEN_HOME" ]; then
+  verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  exec_maven "$@"
+fi
+
+case "${distributionUrl-}" in
+*?-bin.zip | *?maven-mvnd-?*-?*.zip) ;;
+*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
+esac
+
+# prepare tmp dir
+if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
+  clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
+  trap clean HUP INT TERM EXIT
+else
+  die "cannot create temp dir"
+fi
+
+mkdir -p -- "${MAVEN_HOME%/*}"
+
+# Download and Install Apache Maven
+verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+verbose "Downloading from: $distributionUrl"
+verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+# select .zip or .tar.gz
+if ! command -v unzip >/dev/null; then
+  distributionUrl="${distributionUrl%.zip}.tar.gz"
+  distributionUrlName="${distributionUrl##*/}"
+fi
+
+# verbose opt
+__MVNW_QUIET_WGET=--quiet __MVNW_QUIET_CURL=--silent __MVNW_QUIET_UNZIP=-q __MVNW_QUIET_TAR=''
+[ "${MVNW_VERBOSE-}" != true ] || __MVNW_QUIET_WGET='' __MVNW_QUIET_CURL='' __MVNW_QUIET_UNZIP='' __MVNW_QUIET_TAR=v
+
+# normalize http auth
+case "${MVNW_PASSWORD:+has-password}" in
+'') MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+has-password) [ -n "${MVNW_USERNAME-}" ] || MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+esac
+
+if [ -z "${MVNW_USERNAME-}" ] && command -v wget >/dev/null; then
+  verbose "Found wget ... using wget"
+  wget ${__MVNW_QUIET_WGET:+"$__MVNW_QUIET_WGET"} "$distributionUrl" -O "$TMP_DOWNLOAD_DIR/$distributionUrlName" || die "wget: Failed to fetch $distributionUrl"
+elif [ -z "${MVNW_USERNAME-}" ] && command -v curl >/dev/null; then
+  verbose "Found curl ... using curl"
+  curl ${__MVNW_QUIET_CURL:+"$__MVNW_QUIET_CURL"} -f -L -o "$TMP_DOWNLOAD_DIR/$distributionUrlName" "$distributionUrl" || die "curl: Failed to fetch $distributionUrl"
+elif set_java_home; then
+  verbose "Falling back to use Java to download"
+  javaSource="$TMP_DOWNLOAD_DIR/Downloader.java"
+  targetZip="$TMP_DOWNLOAD_DIR/$distributionUrlName"
+  cat >"$javaSource" <<-END
+	public class Downloader extends java.net.Authenticator
+	{
+	  protected java.net.PasswordAuthentication getPasswordAuthentication()
+	  {
+	    return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
+	  }
+	  public static void main( String[] args ) throws Exception
+	  {
+	    setDefault( new Downloader() );
+	    java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );
+	  }
+	}
+	END
+  # For Cygwin/MinGW, switch paths to Windows format before running javac and java
+  verbose " - Compiling Downloader.java ..."
+  "$(native_path "$JAVACCMD")" "$(native_path "$javaSource")" || die "Failed to compile Downloader.java"
+  verbose " - Running Downloader.java ..."
+  "$(native_path "$JAVACMD")" -cp "$(native_path "$TMP_DOWNLOAD_DIR")" Downloader "$distributionUrl" "$(native_path "$targetZip")"
+fi
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+if [ -n "${distributionSha256Sum-}" ]; then
+  distributionSha256Result=false
+  if [ "$MVN_CMD" = mvnd.sh ]; then
+    echo "Checksum validation is not supported for maven-mvnd." >&2
+    echo "Please disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  elif command -v sha256sum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c - >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  elif command -v shasum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  else
+    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available." >&2
+    echo "Please install either command, or disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  fi
+  if [ $distributionSha256Result = false ]; then
+    echo "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised." >&2
+    echo "If you updated your Maven version, you need to update the specified distributionSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+# unzip and move
+if command -v unzip >/dev/null; then
+  unzip ${__MVNW_QUIET_UNZIP:+"$__MVNW_QUIET_UNZIP"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -d "$TMP_DOWNLOAD_DIR" || die "failed to unzip"
+else
+  tar xzf${__MVNW_QUIET_TAR:+"$__MVNW_QUIET_TAR"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -C "$TMP_DOWNLOAD_DIR" || die "failed to untar"
+fi
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+actualDistributionDir=""
+
+# First try the expected directory name (for regular distributions)
+if [ -d "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" ]; then
+  if [ -f "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/bin/$MVN_CMD" ]; then
+    actualDistributionDir="$distributionUrlNameMain"
+  fi
+fi
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if [ -z "$actualDistributionDir" ]; then
+  # enable globbing to iterate over items
+  set +f
+  for dir in "$TMP_DOWNLOAD_DIR"/*; do
+    if [ -d "$dir" ]; then
+      if [ -f "$dir/bin/$MVN_CMD" ]; then
+        actualDistributionDir="$(basename "$dir")"
+        break
+      fi
+    fi
+  done
+  set -f
+fi
+
+if [ -z "$actualDistributionDir" ]; then
+  verbose "Contents of $TMP_DOWNLOAD_DIR:"
+  verbose "$(ls -la "$TMP_DOWNLOAD_DIR")"
+  die "Could not find Maven distribution directory in extracted archive"
+fi
+
+verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$actualDistributionDir/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$actualDistributionDir" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"
--- a/mvnw.cmd
+++ b/mvnw.cmd
@@ -0,0 +1,189 @@
+<# : batch portion
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.3.4
+@REM
+@REM Optional ENV vars
+@REM   MVNW_REPOURL - repo url base for downloading maven distribution
+@REM   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+@REM   MVNW_VERBOSE - true: enable verbose log; others: silence the output
+@REM ----------------------------------------------------------------------------
+
+@IF "%__MVNW_ARG0_NAME__%"=="" (SET __MVNW_ARG0_NAME__=%~nx0)
+@SET __MVNW_CMD__=
+@SET __MVNW_ERROR__=
+@SET __MVNW_PSMODULEP_SAVE=%PSModulePath%
+@SET PSModulePath=
+@FOR /F "usebackq tokens=1* delims==" %%A IN (`powershell -noprofile "& {$scriptDir='%~dp0'; $script='%__MVNW_ARG0_NAME__%'; icm -ScriptBlock ([Scriptblock]::Create((Get-Content -Raw '%~f0'))) -NoNewScope}"`) DO @(
+  IF "%%A"=="MVN_CMD" (set __MVNW_CMD__=%%B) ELSE IF "%%B"=="" (echo %%A) ELSE (echo %%A=%%B)
+)
+@SET PSModulePath=%__MVNW_PSMODULEP_SAVE%
+@SET __MVNW_PSMODULEP_SAVE=
+@SET __MVNW_ARG0_NAME__=
+@SET MVNW_USERNAME=
+@SET MVNW_PASSWORD=
+@IF NOT "%__MVNW_CMD__%"=="" ("%__MVNW_CMD__%" %*)
+@echo Cannot start maven from wrapper >&2 && exit /b 1
+@GOTO :EOF
+: end batch / begin powershell #>
+
+$ErrorActionPreference = "Stop"
+if ($env:MVNW_VERBOSE -eq "true") {
+  $VerbosePreference = "Continue"
+}
+
+# calculate distributionUrl, requires .mvn/wrapper/maven-wrapper.properties
+$distributionUrl = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionUrl
+if (!$distributionUrl) {
+  Write-Error "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+}
+
+switch -wildcard -casesensitive ( $($distributionUrl -replace '^.*/','') ) {
+  "maven-mvnd-*" {
+    $USE_MVND = $true
+    $distributionUrl = $distributionUrl -replace '-bin\.[^.]*$',"-windows-amd64.zip"
+    $MVN_CMD = "mvnd.cmd"
+    break
+  }
+  default {
+    $USE_MVND = $false
+    $MVN_CMD = $script -replace '^mvnw','mvn'
+    break
+  }
+}
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+if ($env:MVNW_REPOURL) {
+  $MVNW_REPO_PATTERN = if ($USE_MVND -eq $False) { "/org/apache/maven/" } else { "/maven/mvnd/" }
+  $distributionUrl = "$env:MVNW_REPOURL$MVNW_REPO_PATTERN$($distributionUrl -replace "^.*$MVNW_REPO_PATTERN",'')"
+}
+$distributionUrlName = $distributionUrl -replace '^.*/',''
+$distributionUrlNameMain = $distributionUrlName -replace '\.[^.]*$','' -replace '-bin$',''
+
+$MAVEN_M2_PATH = "$HOME/.m2"
+if ($env:MAVEN_USER_HOME) {
+  $MAVEN_M2_PATH = "$env:MAVEN_USER_HOME"
+}
+
+if (-not (Test-Path -Path $MAVEN_M2_PATH)) {
+    New-Item -Path $MAVEN_M2_PATH -ItemType Directory | Out-Null
+}
+
+$MAVEN_WRAPPER_DISTS = $null
+if ((Get-Item $MAVEN_M2_PATH).Target[0] -eq $null) {
+  $MAVEN_WRAPPER_DISTS = "$MAVEN_M2_PATH/wrapper/dists"
+} else {
+  $MAVEN_WRAPPER_DISTS = (Get-Item $MAVEN_M2_PATH).Target[0] + "/wrapper/dists"
+}
+
+$MAVEN_HOME_PARENT = "$MAVEN_WRAPPER_DISTS/$distributionUrlNameMain"
+$MAVEN_HOME_NAME = ([System.Security.Cryptography.SHA256]::Create().ComputeHash([byte[]][char[]]$distributionUrl) | ForEach-Object {$_.ToString("x2")}) -join ''
+$MAVEN_HOME = "$MAVEN_HOME_PARENT/$MAVEN_HOME_NAME"
+
+if (Test-Path -Path "$MAVEN_HOME" -PathType Container) {
+  Write-Verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
+  exit $?
+}
+
+if (! $distributionUrlNameMain -or ($distributionUrlName -eq $distributionUrlNameMain)) {
+  Write-Error "distributionUrl is not valid, must end with *-bin.zip, but found $distributionUrl"
+}
+
+# prepare tmp dir
+$TMP_DOWNLOAD_DIR_HOLDER = New-TemporaryFile
+$TMP_DOWNLOAD_DIR = New-Item -Itemtype Directory -Path "$TMP_DOWNLOAD_DIR_HOLDER.dir"
+$TMP_DOWNLOAD_DIR_HOLDER.Delete() | Out-Null
+trap {
+  if ($TMP_DOWNLOAD_DIR.Exists) {
+    try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+    catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+  }
+}
+
+New-Item -Itemtype Directory -Path "$MAVEN_HOME_PARENT" -Force | Out-Null
+
+# Download and Install Apache Maven
+Write-Verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+Write-Verbose "Downloading from: $distributionUrl"
+Write-Verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+$webclient = New-Object System.Net.WebClient
+if ($env:MVNW_USERNAME -and $env:MVNW_PASSWORD) {
+  $webclient.Credentials = New-Object System.Net.NetworkCredential($env:MVNW_USERNAME, $env:MVNW_PASSWORD)
+}
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+$webclient.DownloadFile($distributionUrl, "$TMP_DOWNLOAD_DIR/$distributionUrlName") | Out-Null
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+$distributionSha256Sum = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionSha256Sum
+if ($distributionSha256Sum) {
+  if ($USE_MVND) {
+    Write-Error "Checksum validation is not supported for maven-mvnd. `nPlease disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties."
+  }
+  Import-Module $PSHOME\Modules\Microsoft.PowerShell.Utility -Function Get-FileHash
+  if ((Get-FileHash "$TMP_DOWNLOAD_DIR/$distributionUrlName" -Algorithm SHA256).Hash.ToLower() -ne $distributionSha256Sum) {
+    Write-Error "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised. If you updated your Maven version, you need to update the specified distributionSha256Sum property."
+  }
+}
+
+# unzip and move
+Expand-Archive "$TMP_DOWNLOAD_DIR/$distributionUrlName" -DestinationPath "$TMP_DOWNLOAD_DIR" | Out-Null
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+$actualDistributionDir = ""
+
+# First try the expected directory name (for regular distributions)
+$expectedPath = Join-Path "$TMP_DOWNLOAD_DIR" "$distributionUrlNameMain"
+$expectedMvnPath = Join-Path "$expectedPath" "bin/$MVN_CMD"
+if ((Test-Path -Path $expectedPath -PathType Container) -and (Test-Path -Path $expectedMvnPath -PathType Leaf)) {
+  $actualDistributionDir = $distributionUrlNameMain
+}
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if (!$actualDistributionDir) {
+  Get-ChildItem -Path "$TMP_DOWNLOAD_DIR" -Directory | ForEach-Object {
+    $testPath = Join-Path $_.FullName "bin/$MVN_CMD"
+    if (Test-Path -Path $testPath -PathType Leaf) {
+      $actualDistributionDir = $_.Name
+    }
+  }
+}
+
+if (!$actualDistributionDir) {
+  Write-Error "Could not find Maven distribution directory in extracted archive"
+}
+
+Write-Verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+Rename-Item -Path "$TMP_DOWNLOAD_DIR/$actualDistributionDir" -NewName $MAVEN_HOME_NAME | Out-Null
+try {
+  Move-Item -Path "$TMP_DOWNLOAD_DIR/$MAVEN_HOME_NAME" -Destination $MAVEN_HOME_PARENT | Out-Null
+} catch {
+  if (! (Test-Path -Path "$MAVEN_HOME" -PathType Container)) {
+    Write-Error "fail to move MAVEN_HOME"
+  }
+} finally {
+  try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+  catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+}
+
+Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
--- a/pom.xml
+++ b/pom.xml
@@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>4.1.0</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.rit</groupId>
+	<artifactId>whatsapp-bot</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>whatsapp-bot</name>
+	<description/>
+	<url/>
+	<licenses>
+		<license/>
+	</licenses>
+	<developers>
+		<developer/>
+	</developers>
+	<scm>
+		<connection/>
+		<developerConnection/>
+		<tag/>
+		<url/>
+	</scm>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-webmvc-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>default-compile</id>
+						<phase>compile</phase>
+						<goals>
+							<goal>compile</goal>
+						</goals>
+						<configuration>
+							<annotationProcessorPaths>
+								<path>
+									<groupId>org.projectlombok</groupId>
+									<artifactId>lombok</artifactId>
+								</path>
+							</annotationProcessorPaths>
+						</configuration>
+					</execution>
+					<execution>
+						<id>default-testCompile</id>
+						<phase>test-compile</phase>
+						<goals>
+							<goal>testCompile</goal>
+						</goals>
+						<configuration>
+							<annotationProcessorPaths>
+								<path>
+									<groupId>org.projectlombok</groupId>
+									<artifactId>lombok</artifactId>
+								</path>
+							</annotationProcessorPaths>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
--- a/src/main/java/com/rit/whatsapp/WhatsappBotApplication.java
+++ b/src/main/java/com/rit/whatsapp/WhatsappBotApplication.java
@@ -0,0 +1,13 @@
+package com.rit.whatsapp;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WhatsappBotApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(WhatsappBotApplication.class, args);
+	}
+
+}
--- a/src/main/java/com/rit/whatsapp/controller/WebhookController.java
+++ b/src/main/java/com/rit/whatsapp/controller/WebhookController.java
@@ -0,0 +1,178 @@
+package com.rit.whatsapp.controller;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.rit.whatsapp.handler.GrievanceHandler;
+import com.rit.whatsapp.handler.LoginHandler;
+import com.rit.whatsapp.handler.StudentMenuHandler;
+import com.rit.whatsapp.model.UserState;
+import com.rit.whatsapp.service.SessionService;
+import com.rit.whatsapp.service.WhatsAppMessageService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/webhook")
+public class WebhookController {
+
+    @Value("${whatsapp.verify-token:my_secure_verify_token}")
+    private String verifyToken;
+
+    private final WhatsAppMessageService messageService;
+    private final SessionService sessionService;
+    private final StudentMenuHandler studentMenuHandler;
+    private final GrievanceHandler grievanceHandler;
+    private final LoginHandler loginHandler;
+    private final ObjectMapper objectMapper;
+
+    @Autowired
+    public WebhookController(WhatsAppMessageService messageService, 
+                             SessionService sessionService,
+                             StudentMenuHandler studentMenuHandler,
+                             GrievanceHandler grievanceHandler,
+                             LoginHandler loginHandler) {
+        this.messageService = messageService;
+        this.sessionService = sessionService;
+        this.studentMenuHandler = studentMenuHandler;
+        this.grievanceHandler = grievanceHandler;
+        this.loginHandler = loginHandler;
+        this.objectMapper = new ObjectMapper();
+    }
+
+    @GetMapping
+    public ResponseEntity<String> verifyWebhook(
+            @RequestParam(name = "hub.mode", required = false) String mode,
+            @RequestParam(name = "hub.verify_token", required = false) String token,
+            @RequestParam(name = "hub.challenge", required = false) String challenge) {
+
+        if ("subscribe".equals(mode) && verifyToken.equals(token)) {
+            return ResponseEntity.ok(challenge);
+        } else {
+            return ResponseEntity.status(HttpStatus.FORBIDDEN).build();
+        }
+    }
+
+    @PostMapping
+    public ResponseEntity<String> receiveMessage(@RequestBody String payload) {
+        System.out.println("Received Webhook Payload: " + payload);
+        try {
+            JsonNode rootNode = objectMapper.readTree(payload);
+            
+            if (rootNode.has("entry") && rootNode.get("entry").isArray()) {
+                JsonNode entryNode = rootNode.get("entry").get(0);
+                
+                if (entryNode.has("changes") && entryNode.get("changes").isArray()) {
+                    JsonNode changesNode = entryNode.get("changes").get(0);
+                    JsonNode valueNode = changesNode.get("value");
+                    
+                    if (valueNode != null && valueNode.has("messages") && valueNode.get("messages").isArray()) {
+                        JsonNode messageNode = valueNode.get("messages").get(0);
+                        
+                        String fromPhoneNumber = messageNode.get("from").asText();
+                        String messageType = messageNode.get("type").asText();
+                        
+                        UserState currentState = sessionService.getUserState(fromPhoneNumber);
+                        boolean isAuthenticated = sessionService.isAuthenticated(fromPhoneNumber);
+
+                        // Global reset command
+                        if ("text".equals(messageType) && messageNode.get("text").get("body").asText().trim().equalsIgnoreCase("reset")) {
+                            sessionService.resetState(fromPhoneNumber);
+                            if (isAuthenticated) {
+                                studentMenuHandler.sendMainMenu(fromPhoneNumber);
+                            } else {
+                                loginHandler.startLoginFlow(fromPhoneNumber);
+                            }
+                            return ResponseEntity.ok("EVENT_RECEIVED");
+                        }
+
+                        // Route unauthenticated users strictly to Login Flow
+                        if (!isAuthenticated) {
+                            if ("text".equals(messageType)) {
+                                String body = messageNode.get("text").get("body").asText();
+                                handleUnauthenticatedUser(fromPhoneNumber, body, currentState);
+                            } else {
+                                // If they send a sticker/image/etc before logging in, force login
+                                handleUnauthenticatedUser(fromPhoneNumber, "", currentState);
+                            }
+                            return ResponseEntity.ok("EVENT_RECEIVED");
+                        }
+
+                        // Authenticated users flow
+                        if ("text".equals(messageType)) {
+                            String messageBody = messageNode.get("text").get("body").asText();
+                            handleAuthenticatedTextMessage(fromPhoneNumber, messageBody, currentState);
+                        } else if ("interactive".equals(messageType)) {
+                            JsonNode interactiveNode = messageNode.get("interactive");
+                            String interactiveType = interactiveNode.get("type").asText();
+                            
+                            if ("list_reply".equals(interactiveType)) {
+                                String selectedListId = interactiveNode.get("list_reply").get("id").asText();
+                                handleInteractiveListSelection(fromPhoneNumber, selectedListId, currentState);
+                            } else if ("button_reply".equals(interactiveType)) {
+                                String selectedButtonId = interactiveNode.get("button_reply").get("id").asText();
+                                handleInteractiveButtonSelection(fromPhoneNumber, selectedButtonId, currentState);
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+            System.err.println("Error processing webhook payload: " + e.getMessage());
+        }
+        
+        return ResponseEntity.ok("EVENT_RECEIVED");
+    }
+
+    private void handleUnauthenticatedUser(String phoneNumber, String messageBody, UserState currentState) {
+        switch (currentState) {
+            case AWAITING_LOGIN_ID:
+                loginHandler.handleLoginIdInput(phoneNumber, messageBody);
+                break;
+            case AWAITING_LOGIN_PASSCODE:
+                loginHandler.handlePasscodeInput(phoneNumber, messageBody);
+                break;
+            default:
+                // Trigger the start of the login flow
+                loginHandler.startLoginFlow(phoneNumber);
+                break;
+        }
+    }
+
+    private void handleAuthenticatedTextMessage(String phoneNumber, String messageBody, UserState currentState) {
+        switch (currentState) {
+            case AWAITING_GRIEVANCE_DESC:
+                grievanceHandler.handleGrievanceDescription(phoneNumber, messageBody);
+                break;
+            case MAIN_MENU:
+            default:
+                // Fallback to main menu
+                studentMenuHandler.sendMainMenu(phoneNumber);
+                break;
+        }
+    }
+
+    private void handleInteractiveListSelection(String phoneNumber, String selectedListId, UserState currentState) {
+        if (currentState == UserState.MAIN_MENU) {
+            studentMenuHandler.handleMenuSelection(phoneNumber, selectedListId);
+        } else {
+            studentMenuHandler.sendMainMenu(phoneNumber);
+        }
+    }
+
+    private void handleInteractiveButtonSelection(String phoneNumber, String selectedButtonId, UserState currentState) {
+        if ("student_logout".equals(selectedButtonId)) {
+            sessionService.logoutUser(phoneNumber);
+            messageService.sendMessage(phoneNumber, "You have been logged out successfully. Type 'Hi' to log in again.");
+            return;
+        }
+
+        if (currentState == UserState.AWAITING_GRIEVANCE_CATEGORY) {
+            grievanceHandler.handleCategorySelection(phoneNumber, selectedButtonId);
+        } else {
+            studentMenuHandler.sendMainMenu(phoneNumber);
+        }
+    }
+}
--- a/src/main/java/com/rit/whatsapp/handler/GrievanceHandler.java
+++ b/src/main/java/com/rit/whatsapp/handler/GrievanceHandler.java
@@ -0,0 +1,71 @@
+package com.rit.whatsapp.handler;
+
+import com.rit.whatsapp.model.UserState;
+import com.rit.whatsapp.service.SessionService;
+import com.rit.whatsapp.service.WhatsAppMessageBuilder;
+import com.rit.whatsapp.service.WhatsAppMessageService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+@Component
+public class GrievanceHandler {
+
+    private final WhatsAppMessageService messageService;
+    private final SessionService sessionService;
+
+    @Autowired
+    public GrievanceHandler(WhatsAppMessageService messageService, SessionService sessionService) {
+        this.messageService = messageService;
+        this.sessionService = sessionService;
+    }
+
+    public void startGrievanceFlow(String phoneNumber) {
+        sessionService.setUserState(phoneNumber, UserState.AWAITING_GRIEVANCE_CATEGORY);
+
+        List<Map<String, String>> buttons = new ArrayList<>();
+        buttons.add(createButton("grievance_academic", "Academic"));
+        buttons.add(createButton("grievance_hostel", "Hostel"));
+        buttons.add(createButton("grievance_other", "Other"));
+
+        Map<String, Object> buttonMessage = WhatsAppMessageBuilder.buildButtonMessage(
+                "Please select the category for your grievance:",
+                buttons
+        );
+
+        messageService.sendInteractiveMessage(phoneNumber, buttonMessage);
+    }
+
+    public void handleCategorySelection(String phoneNumber, String selectedCategory) {
+        sessionService.setUserState(phoneNumber, UserState.AWAITING_GRIEVANCE_DESC);
+        messageService.sendMessage(phoneNumber, "You selected " + selectedCategory + ". Please type a brief description of your issue:");
+    }
+
+    public void handleGrievanceDescription(String phoneNumber, String description) {
+        // Generate a mock ticket ID
+        String ticketId = "TKT-" + UUID.randomUUID().toString().substring(0, 6).toUpperCase();
+        
+        String confirmationMessage = "Thank you. Your grievance has been recorded.\n\n" +
+                "Ticket ID: *" + ticketId + "*\n" +
+                "Department Notified: Yes\n" +
+                "Status: Open\n\n" +
+                "You can check the status of this ticket anytime using the main menu.";
+
+        messageService.sendMessage(phoneNumber, confirmationMessage);
+        
+        // Reset state back to main menu
+        sessionService.resetState(phoneNumber);
+    }
+
+    private Map<String, String> createButton(String id, String title) {
+        Map<String, String> btn = new HashMap<>();
+        btn.put("id", id);
+        btn.put("title", title);
+        return btn;
+    }
+}
--- a/src/main/java/com/rit/whatsapp/handler/LoginHandler.java
+++ b/src/main/java/com/rit/whatsapp/handler/LoginHandler.java
@@ -0,0 +1,64 @@
+package com.rit.whatsapp.handler;
+
+import com.rit.whatsapp.model.UserState;
+import com.rit.whatsapp.service.ImsApiService;
+import com.rit.whatsapp.service.SessionService;
+import com.rit.whatsapp.service.WhatsAppMessageService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class LoginHandler {
+
+    private final WhatsAppMessageService messageService;
+    private final SessionService sessionService;
+    private final ImsApiService imsApiService;
+    private final StudentMenuHandler studentMenuHandler;
+
+    @Autowired
+    public LoginHandler(WhatsAppMessageService messageService, 
+                        SessionService sessionService, 
+                        ImsApiService imsApiService,
+                        StudentMenuHandler studentMenuHandler) {
+        this.messageService = messageService;
+        this.sessionService = sessionService;
+        this.imsApiService = imsApiService;
+        this.studentMenuHandler = studentMenuHandler;
+    }
+
+    public void startLoginFlow(String phoneNumber) {
+        sessionService.setUserState(phoneNumber, UserState.AWAITING_LOGIN_ID);
+        messageService.sendMessage(phoneNumber, "Welcome to RIT Digital Assistant! 🎓\n\nPlease enter your IMS User ID to login:");
+    }
+
+    public void handleLoginIdInput(String phoneNumber, String imsId) {
+        sessionService.setTempLoginId(phoneNumber, imsId);
+        sessionService.setUserState(phoneNumber, UserState.AWAITING_LOGIN_PASSCODE);
+        messageService.sendMessage(phoneNumber, "Thanks. Now, please enter your IMS Passcode:");
+    }
+
+    public void handlePasscodeInput(String phoneNumber, String passcode) {
+        String imsId = sessionService.getTempLoginId(phoneNumber);
+        
+        messageService.sendMessage(phoneNumber, "Authenticating with IMS... ⏳");
+
+        String imsSessionToken = imsApiService.authenticate(imsId, passcode);
+
+        if (imsSessionToken != null) {
+            // Authentication successful
+            sessionService.authenticateUser(phoneNumber, imsId, passcode, imsSessionToken);
+            sessionService.clearTempLoginId(phoneNumber);
+            sessionService.resetState(phoneNumber); // Reset the flow state
+            
+            messageService.sendMessage(phoneNumber, "✅ Login Successful!");
+            
+            // Show the main menu
+            studentMenuHandler.sendMainMenu(phoneNumber);
+        } else {
+            // Authentication failed
+            sessionService.clearTempLoginId(phoneNumber);
+            sessionService.setUserState(phoneNumber, UserState.AWAITING_LOGIN_ID);
+            messageService.sendMessage(phoneNumber, "❌ Login Failed. Invalid ID or Passcode. Please try again.\n\nEnter your IMS User ID:");
+        }
+    }
+}
--- a/src/main/java/com/rit/whatsapp/handler/StudentMenuHandler.java
+++ b/src/main/java/com/rit/whatsapp/handler/StudentMenuHandler.java
@@ -0,0 +1,117 @@
+package com.rit.whatsapp.handler;
+
+import com.rit.whatsapp.model.UserState;
+import com.rit.whatsapp.service.ImsApiService;
+import com.rit.whatsapp.service.SessionService;
+import com.rit.whatsapp.service.WhatsAppMessageBuilder;
+import com.rit.whatsapp.service.WhatsAppMessageService;
+import com.rit.whatsapp.util.MessageFormatter;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Component
+public class StudentMenuHandler {
+
+    private final WhatsAppMessageService messageService;
+    private final SessionService sessionService;
+    private final GrievanceHandler grievanceHandler;
+    private final ImsApiService imsApiService;
+
+    @Autowired
+    public StudentMenuHandler(WhatsAppMessageService messageService, 
+                              SessionService sessionService, 
+                              GrievanceHandler grievanceHandler,
+                              ImsApiService imsApiService) {
+        this.messageService = messageService;
+        this.sessionService = sessionService;
+        this.grievanceHandler = grievanceHandler;
+        this.imsApiService = imsApiService;
+    }
+
+    public void sendMainMenu(String phoneNumber) {
+        sessionService.setUserState(phoneNumber, UserState.MAIN_MENU);
+
+        List<Map<String, String>> rows = new ArrayList<>();
+        rows.add(createRow("student_attendance", "Attendance", "Overall % and Subject-wise"));
+        rows.add(createRow("student_timetable", "Timetable", "Today's classes and Weekly"));
+        rows.add(createRow("student_internal_marks", "Internal marks", "CAT 1, CAT 2, Overall"));
+        rows.add(createRow("student_semester_results", "Semester results", "Latest result and CGPA"));
+        rows.add(createRow("student_fee_details", "Fee details & receipt", "Fee paid, Pending, Due date"));
+        rows.add(createRow("student_academic_calendar", "Academic calendar", "Holidays and Important dates"));
+        rows.add(createRow("student_exam_schedule", "Exam schedule", "Upcoming exams and Hall details"));
+        rows.add(createRow("student_circulars", "Circulars & Notices", "Department circulars"));
+        rows.add(createRow("student_raise_grievance", "Raise a grievance \u2B50", "Submit an issue ticket"));
+        rows.add(createRow("student_contact_department", "Contact department", "Faculty mentor, HOD, etc."));
+
+        Map<String, Object> interactiveList = WhatsAppMessageBuilder.buildListMessage(
+                "RIT Digital Assistant",
+                "Welcome to the RITz Student Portal! Please select an option from the menu below.",
+                "Student Menu",
+                rows
+        );
+
+        messageService.sendInteractiveMessage(phoneNumber, interactiveList);
+
+        // Send a separate Logout button since the list is maxed out at 10 items
+        List<Map<String, String>> logoutBtn = new ArrayList<>();
+        Map<String, String> btn = new HashMap<>();
+        btn.put("id", "student_logout");
+        btn.put("title", "Logout");
+        logoutBtn.add(btn);
+
+        Map<String, Object> logoutMessage = WhatsAppMessageBuilder.buildButtonMessage(
+                "Need to switch accounts?",
+                logoutBtn
+        );
+        messageService.sendInteractiveMessage(phoneNumber, logoutMessage);
+    }
+
+    public void handleMenuSelection(String phoneNumber, String selectedOptionId) {
+        String token = sessionService.getImsToken(phoneNumber);
+        if (token == null) {
+            messageService.sendMessage(phoneNumber, "Your session has expired. Please type 'Reset' to login again.");
+            return;
+        }
+
+        switch (selectedOptionId) {
+            case "student_attendance":
+                String rawAttendance = imsApiService.getAttendance(token);
+                messageService.sendMessage(phoneNumber, MessageFormatter.formatAttendance(rawAttendance));
+                break;
+                
+            case "student_timetable":
+                String rawTimetable = imsApiService.getTimetable(token);
+                messageService.sendMessage(phoneNumber, MessageFormatter.formatTimetable(rawTimetable));
+                break;
+                
+            case "student_semester_results":
+                // Defaulting to semester 1 for now
+                String rawResults = imsApiService.getResults(token, 1);
+                messageService.sendMessage(phoneNumber, MessageFormatter.formatResults(rawResults, 1));
+                break;
+
+            case "student_raise_grievance":
+                grievanceHandler.startGrievanceFlow(phoneNumber);
+                break;
+                
+            default:
+                messageService.sendMessage(phoneNumber, "You selected an option that is currently under development. Please check back later!");
+                // Resend main menu
+                sendMainMenu(phoneNumber);
+                break;
+        }
+    }
+
+    private Map<String, String> createRow(String id, String title, String description) {
+        Map<String, String> row = new HashMap<>();
+        row.put("id", id);
+        row.put("title", title);
+        row.put("description", description);
+        return row;
+    }
+}
--- a/src/main/java/com/rit/whatsapp/model/UserEntity.java
+++ b/src/main/java/com/rit/whatsapp/model/UserEntity.java
@@ -0,0 +1,50 @@
+package com.rit.whatsapp.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "users")
+public class UserEntity {
+
+    @Id
+    private String phoneNumber;
+    
+    private String imsId;
+    
+    private String encryptedPasscode;
+
+    public UserEntity() {
+    }
+
+    public UserEntity(String phoneNumber, String imsId, String encryptedPasscode) {
+        this.phoneNumber = phoneNumber;
+        this.imsId = imsId;
+        this.encryptedPasscode = encryptedPasscode;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getImsId() {
+        return imsId;
+    }
+
+    public void setImsId(String imsId) {
+        this.imsId = imsId;
+    }
+
+    public String getEncryptedPasscode() {
+        return encryptedPasscode;
+    }
+
+    public void setEncryptedPasscode(String encryptedPasscode) {
+        this.encryptedPasscode = encryptedPasscode;
+    }
+}
--- a/src/main/java/com/rit/whatsapp/model/UserState.java
+++ b/src/main/java/com/rit/whatsapp/model/UserState.java
@@ -0,0 +1,9 @@
+package com.rit.whatsapp.model;
+
+public enum UserState {
+    MAIN_MENU,
+    AWAITING_LOGIN_ID,
+    AWAITING_LOGIN_PASSCODE,
+    AWAITING_GRIEVANCE_CATEGORY,
+    AWAITING_GRIEVANCE_DESC
+}
--- a/src/main/java/com/rit/whatsapp/repository/UserRepository.java
+++ b/src/main/java/com/rit/whatsapp/repository/UserRepository.java
@@ -0,0 +1,9 @@
+package com.rit.whatsapp.repository;
+
+import com.rit.whatsapp.model.UserEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<UserEntity, String> {
+}
--- a/src/main/java/com/rit/whatsapp/service/ImsApiService.java
+++ b/src/main/java/com/rit/whatsapp/service/ImsApiService.java
@@ -0,0 +1,105 @@
+package com.rit.whatsapp.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Service
+public class ImsApiService {
+
+    private final String BASE_URL = "https://ims-api.sidharthprabhu.co.in";
+    private final RestTemplate restTemplate;
+    private final ObjectMapper objectMapper;
+
+    public ImsApiService() {
+        this.restTemplate = new RestTemplate();
+        this.objectMapper = new ObjectMapper();
+    }
+
+    /**
+     * Authenticates the user against the real IMS backend.
+     * @param imsId The user ID
+     * @param passcode The passcode
+     * @return The API session token if successful, null otherwise.
+     */
+    public String authenticate(String imsId, String passcode) {
+        String url = BASE_URL + "/api/auth/login";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+
+        Map<String, String> requestBody = new HashMap<>();
+        requestBody.put("username", imsId);
+        requestBody.put("password", passcode);
+
+        HttpEntity<Map<String, String>> request = new HttpEntity<>(requestBody, headers);
+
+        try {
+            ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
+            if (response.getStatusCode().is2xxSuccessful() && response.getBody() != null) {
+                JsonNode rootNode = objectMapper.readTree(response.getBody());
+                if (rootNode.has("success") && rootNode.get("success").asBoolean()) {
+                    if (rootNode.has("session")) {
+                        return rootNode.get("session").asText();
+                    }
+                }
+            }
+        } catch (Exception e) {
+            System.err.println("Failed to authenticate with IMS API: " + e.getMessage());
+        }
+        
+        return null;
+    }
+
+    private String fetchFromIms(String endpoint, String token) {
+        String url = BASE_URL + endpoint;
+        HttpHeaders headers = new HttpHeaders();
+        headers.setBearerAuth(token);
+        
+        HttpEntity<String> request = new HttpEntity<>(headers);
+        
+        try {
+            ResponseEntity<String> response = restTemplate.exchange(url, org.springframework.http.HttpMethod.GET, request, String.class);
+            if (response.getStatusCode().is2xxSuccessful()) {
+                return response.getBody();
+            }
+        } catch (Exception e) {
+            System.err.println("Failed to fetch from IMS API (" + endpoint + "): " + e.getMessage());
+        }
+        return null;
+    }
+
+    public String getAttendance(String token) {
+        return fetchFromIms("/api/student/attendance", token);
+    }
+
+    public String getTimetable(String token) {
+        return fetchFromIms("/api/student/timetable", token);
+    }
+
+    public String getResults(String token, int semester) {
+        return fetchFromIms("/api/student/results?semester=" + semester, token);
+    }
+
+    public void logout(String token) {
+        String url = BASE_URL + "/api/auth/logout";
+        HttpHeaders headers = new HttpHeaders();
+        headers.setBearerAuth(token);
+        
+        HttpEntity<String> request = new HttpEntity<>(headers);
+        
+        try {
+            restTemplate.postForEntity(url, request, String.class);
+        } catch (Exception e) {
+            System.err.println("Failed to logout from IMS API: " + e.getMessage());
+        }
+    }
+}
--- a/src/main/java/com/rit/whatsapp/service/SessionService.java
+++ b/src/main/java/com/rit/whatsapp/service/SessionService.java
@@ -0,0 +1,107 @@
+package com.rit.whatsapp.service;
+
+import com.rit.whatsapp.model.UserEntity;
+import com.rit.whatsapp.model.UserState;
+import com.rit.whatsapp.repository.UserRepository;
+import com.rit.whatsapp.util.EncryptionUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Service
+public class SessionService {
+
+    private final Map<String, UserState> userStates = new ConcurrentHashMap<>();
+    
+    // In-memory cache for API session tokens
+    private final Map<String, String> sessionTokens = new ConcurrentHashMap<>();
+    private final Map<String, String> temporaryLoginIds = new ConcurrentHashMap<>();
+
+    private final UserRepository userRepository;
+    private final EncryptionUtils encryptionUtils;
+    private final ImsApiService imsApiService;
+
+    @Autowired
+    public SessionService(UserRepository userRepository, 
+                          EncryptionUtils encryptionUtils,
+                          ImsApiService imsApiService) {
+        this.userRepository = userRepository;
+        this.encryptionUtils = encryptionUtils;
+        this.imsApiService = imsApiService;
+    }
+
+    public UserState getUserState(String phoneNumber) {
+        return userStates.getOrDefault(phoneNumber, UserState.MAIN_MENU);
+    }
+
+    public void setUserState(String phoneNumber, UserState state) {
+        userStates.put(phoneNumber, state);
+    }
+    
+    public void resetState(String phoneNumber) {
+        userStates.remove(phoneNumber);
+    }
+
+    public boolean isAuthenticated(String phoneNumber) {
+        if (sessionTokens.containsKey(phoneNumber)) {
+            return true;
+        }
+
+        // Check database for persistent session
+        Optional<UserEntity> userOpt = userRepository.findById(phoneNumber);
+        if (userOpt.isPresent()) {
+            UserEntity user = userOpt.get();
+            String decryptedPasscode = encryptionUtils.decrypt(user.getEncryptedPasscode());
+            
+            // Silent background login
+            String token = imsApiService.authenticate(user.getImsId(), decryptedPasscode);
+            if (token != null) {
+                sessionTokens.put(phoneNumber, token);
+                return true;
+            }
+        }
+        
+        return false;
+    }
+
+    public void authenticateUser(String phoneNumber, String imsId, String passcode, String token) {
+        sessionTokens.put(phoneNumber, token);
+        
+        // Persist to database
+        String encryptedPasscode = encryptionUtils.encrypt(passcode);
+        UserEntity user = new UserEntity(phoneNumber, imsId, encryptedPasscode);
+        userRepository.save(user);
+    }
+
+    public String getImsToken(String phoneNumber) {
+        // Ensure they are authenticated (which populates the token cache if needed)
+        if (isAuthenticated(phoneNumber)) {
+            return sessionTokens.get(phoneNumber);
+        }
+        return null;
+    }
+
+    public void logoutUser(String phoneNumber) {
+        String token = sessionTokens.remove(phoneNumber);
+        if (token != null) {
+            imsApiService.logout(token);
+        }
+        userRepository.deleteById(phoneNumber);
+        resetState(phoneNumber);
+    }
+
+    public void setTempLoginId(String phoneNumber, String tempId) {
+        temporaryLoginIds.put(phoneNumber, tempId);
+    }
+
+    public String getTempLoginId(String phoneNumber) {
+        return temporaryLoginIds.get(phoneNumber);
+    }
+
+    public void clearTempLoginId(String phoneNumber) {
+        temporaryLoginIds.remove(phoneNumber);
+    }
+}
--- a/src/main/java/com/rit/whatsapp/service/WhatsAppMessageBuilder.java
+++ b/src/main/java/com/rit/whatsapp/service/WhatsAppMessageBuilder.java
@@ -0,0 +1,66 @@
+package com.rit.whatsapp.service;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class WhatsAppMessageBuilder {
+
+    public static Map<String, Object> buildListMessage(String header, String body, String buttonText, List<Map<String, String>> rows) {
+        Map<String, Object> interactive = new HashMap<>();
+        interactive.put("type", "list");
+
+        if (header != null && !header.isEmpty()) {
+            Map<String, Object> headerMap = new HashMap<>();
+            headerMap.put("type", "text");
+            headerMap.put("text", header);
+            interactive.put("header", headerMap);
+        }
+
+        Map<String, Object> bodyMap = new HashMap<>();
+        bodyMap.put("text", body);
+        interactive.put("body", bodyMap);
+
+        Map<String, Object> action = new HashMap<>();
+        action.put("button", buttonText);
+
+        List<Map<String, Object>> sections = new ArrayList<>();
+        Map<String, Object> section = new HashMap<>();
+        section.put("title", "Options"); // Default section title
+        section.put("rows", rows);
+        sections.add(section);
+
+        action.put("sections", sections);
+        interactive.put("action", action);
+
+        return interactive;
+    }
+
+    public static Map<String, Object> buildButtonMessage(String body, List<Map<String, String>> buttons) {
+        Map<String, Object> interactive = new HashMap<>();
+        interactive.put("type", "button");
+
+        Map<String, Object> bodyMap = new HashMap<>();
+        bodyMap.put("text", body);
+        interactive.put("body", bodyMap);
+
+        Map<String, Object> action = new HashMap<>();
+        List<Map<String, Object>> actionButtons = new ArrayList<>();
+
+        for (Map<String, String> btn : buttons) {
+            Map<String, Object> buttonWrapper = new HashMap<>();
+            buttonWrapper.put("type", "reply");
+            Map<String, String> reply = new HashMap<>();
+            reply.put("id", btn.get("id"));
+            reply.put("title", btn.get("title"));
+            buttonWrapper.put("reply", reply);
+            actionButtons.add(buttonWrapper);
+        }
+
+        action.put("buttons", actionButtons);
+        interactive.put("action", action);
+
+        return interactive;
+    }
+}
--- a/src/main/java/com/rit/whatsapp/service/WhatsAppMessageService.java
+++ b/src/main/java/com/rit/whatsapp/service/WhatsAppMessageService.java
@@ -0,0 +1,68 @@
+package com.rit.whatsapp.service;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Service
+public class WhatsAppMessageService {
+
+    @Value("${whatsapp.api-token}")
+    private String apiToken;
+
+    @Value("${whatsapp.phone-number-id}")
+    private String phoneNumberId;
+
+    private final RestTemplate restTemplate;
+
+    public WhatsAppMessageService() {
+        this.restTemplate = new RestTemplate();
+    }
+
+    public void sendMessage(String toPhoneNumber, String messageText) {
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("messaging_product", "whatsapp");
+        payload.put("to", toPhoneNumber);
+        payload.put("type", "text");
+
+        Map<String, String> textPayload = new HashMap<>();
+        textPayload.put("body", messageText);
+        payload.put("text", textPayload);
+        
+        executePost(payload);
+    }
+
+    public void sendInteractiveMessage(String toPhoneNumber, Map<String, Object> interactiveObject) {
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("messaging_product", "whatsapp");
+        payload.put("to", toPhoneNumber);
+        payload.put("type", "interactive");
+        payload.put("interactive", interactiveObject);
+
+        executePost(payload);
+    }
+
+    private void executePost(Map<String, Object> payload) {
+        String url = "https://graph.facebook.com/v19.0/" + phoneNumberId + "/messages";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        headers.setBearerAuth(apiToken);
+
+        HttpEntity<Map<String, Object>> request = new HttpEntity<>(payload, headers);
+
+        try {
+            ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
+            System.out.println("Message sent successfully. Response: " + response.getBody());
+        } catch (Exception e) {
+            System.err.println("Failed to send message: " + e.getMessage());
+        }
+    }
+}
--- a/src/main/java/com/rit/whatsapp/util/EncryptionUtils.java
+++ b/src/main/java/com/rit/whatsapp/util/EncryptionUtils.java
@@ -0,0 +1,43 @@
+package com.rit.whatsapp.util;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+@Component
+public class EncryptionUtils {
+
+    @Value("${bot.encryption.secret}")
+    private String secretKey;
+
+    private static final String ALGORITHM = "AES";
+
+    public String encrypt(String value) {
+        try {
+            SecretKeySpec key = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), ALGORITHM);
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            cipher.init(Cipher.ENCRYPT_MODE, key);
+            byte[] encryptedValue = cipher.doFinal(value.getBytes(StandardCharsets.UTF_8));
+            return Base64.getEncoder().encodeToString(encryptedValue);
+        } catch (Exception e) {
+            throw new RuntimeException("Error encrypting value", e);
+        }
+    }
+
+    public String decrypt(String value) {
+        try {
+            SecretKeySpec key = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), ALGORITHM);
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            cipher.init(Cipher.DECRYPT_MODE, key);
+            byte[] decodedValue = Base64.getDecoder().decode(value);
+            byte[] decryptedValue = cipher.doFinal(decodedValue);
+            return new String(decryptedValue, StandardCharsets.UTF_8);
+        } catch (Exception e) {
+            throw new RuntimeException("Error decrypting value", e);
+        }
+    }
+}
--- a/src/main/java/com/rit/whatsapp/util/MessageFormatter.java
+++ b/src/main/java/com/rit/whatsapp/util/MessageFormatter.java
@@ -0,0 +1,104 @@
+package com.rit.whatsapp.util;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class MessageFormatter {
+
+    private static final ObjectMapper mapper = new ObjectMapper();
+
+    public static String formatAttendance(String rawJson) {
+        if (rawJson == null) return "❌ Failed to retrieve attendance data.";
+        
+        try {
+            JsonNode root = mapper.readTree(rawJson);
+            // Assuming the JSON has an array of subjects or an overall percentage
+            // Since we don't have the exact schema, this is a best-effort template.
+            
+            StringBuilder sb = new StringBuilder();
+            sb.append("\ud83d\udcca *Your Attendance Report*\n\n");
+            
+            if (root.has("overall_percentage")) {
+                sb.append("*Overall Attendance:* ").append(root.get("overall_percentage").asText()).append("% \ud83d\udfe2\n\n");
+            } else {
+                sb.append("*Overall Attendance:* Data unavailable\n\n");
+            }
+            
+            sb.append("*Subject-wise Breakdown:*\n");
+            if (root.has("data") && root.get("data").isArray()) {
+                for (JsonNode subject : root.get("data")) {
+                    String name = subject.has("course_name") ? subject.get("course_name").asText() : "Unknown";
+                    String percentage = subject.has("percentage") ? subject.get("percentage").asText() : "0";
+                    sb.append("- ").append(name).append(": ").append(percentage).append("%\n");
+                }
+            } else {
+                sb.append("- Details not available in this format.\n");
+            }
+            
+            sb.append("\n_Keep up the good work!_");
+            return sb.toString();
+        } catch (Exception e) {
+            return "⚠️ Error formatting attendance data.";
+        }
+    }
+
+    public static String formatTimetable(String rawJson) {
+        if (rawJson == null) return "❌ Failed to retrieve timetable data.";
+        
+        try {
+            JsonNode root = mapper.readTree(rawJson);
+            StringBuilder sb = new StringBuilder();
+            sb.append("\ud83d\uddd3\ufe0f *Today's Classes*\n\n");
+            
+            if (root.has("data") && root.get("data").isArray()) {
+                for (JsonNode classNode : root.get("data")) {
+                    String time = classNode.has("time") ? classNode.get("time").asText() : "TBA";
+                    String course = classNode.has("course_name") ? classNode.get("course_name").asText() : "Unknown";
+                    String room = classNode.has("room") ? classNode.get("room").asText() : "Unknown";
+                    
+                    sb.append("*").append(time).append(":* ").append(course).append(" (Room ").append(room).append(")\n");
+                }
+            } else {
+                sb.append("No classes scheduled for today.\n");
+            }
+            
+            return sb.toString();
+        } catch (Exception e) {
+            return "⚠️ Error formatting timetable data.";
+        }
+    }
+
+    public static String formatResults(String rawJson, int semester) {
+        if (rawJson == null) return "❌ Failed to retrieve semester results.";
+        
+        try {
+            JsonNode root = mapper.readTree(rawJson);
+            StringBuilder sb = new StringBuilder();
+            sb.append("\ud83c\udf93 *Semester ").append(semester).append(" Results*\n\n");
+            
+            boolean passedAll = true;
+            
+            if (root.has("data") && root.get("data").isArray()) {
+                for (JsonNode courseNode : root.get("data")) {
+                    String name = courseNode.has("course_name") ? courseNode.get("course_name").asText() : "Unknown";
+                    String total = courseNode.has("total_mark") ? courseNode.get("total_mark").asText() : "0";
+                    String grade = courseNode.has("grade") ? courseNode.get("grade").asText() : "N/A";
+                    String result = courseNode.has("result") ? courseNode.get("result").asText() : "N/A";
+                    
+                    if (!"PASS".equalsIgnoreCase(result)) {
+                        passedAll = false;
+                    }
+                    
+                    sb.append("*").append(name).append(":* ").append(total).append("/100 (Grade: ").append(grade).append(")\n");
+                }
+            } else {
+                sb.append("No results found for this semester.\n");
+            }
+            
+            sb.append("\n*Result:* ").append(passedAll ? "PASS \ud83c\udf89" : "Arrears \u26a0\ufe0f");
+            return sb.toString();
+        } catch (Exception e) {
+            return "⚠️ Error formatting results data.";
+        }
+    }
+}
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -0,0 +1,22 @@
+spring.application.name=whatsapp-bot
+server.port=8080
+
+# WhatsApp Verification Token (You provide this to Meta during webhook setup)
+whatsapp.verify-token=rit_bot_secret_token_123
+
+# WhatsApp Graph API Token (You get this from the Meta developer console)
+whatsapp.api-token=EAAc3Wjql00oBSZAZAWjbSjOOoX3dZBPZAb4VHcQqg1oZAYqPQXvd9fpoNb3bOoPeHtR6irmZB5zQtBApBctcS72eMRgIMa0TOqbP9huKHFoeKq3RJVgcLEtMRJGus4yDrSM23YJpkEbolrT2HDIxahm75fI3oetVZC27jmtoqkdTnVEAOO5wbhZAF7ZAg05nMqFWwMBvpd6cf4Regtfljj0ZBCZBfDaUkOSAf4ZC6D7VFU7djl6RY0qfbRRMRuf0F2D9gV7JzF8WZBZBcvepFixU7PAd6SUsCrxQZDZD
+# WhatsApp Phone Number ID (You get this from the Meta developer console)
+whatsapp.phone-number-id=1236658909534007
+
+# H2 Database Configuration
+spring.datasource.url=jdbc:h2:file:./db/whatsappbot
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=update
+spring.h2.console.enabled=true
+
+# Encryption Secret for Passcodes (Must be 16, 24, or 32 bytes)
+bot.encryption.secret=12345678901234567890123456789012
--- a/src/test/java/com/rit/whatsapp/WhatsappBotApplicationTests.java
+++ b/src/test/java/com/rit/whatsapp/WhatsappBotApplicationTests.java
@@ -0,0 +1,13 @@
+package com.rit.whatsapp;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class WhatsappBotApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}