docs: add comprehensive documentation for automatic capacitor.build.gradle fix

- Add detailed inline documentation in build-native.sh explaining the problem, why it happens, and the solution
- Update fix-capacitor-build.sh with comprehensive header documentation
- Include clear explanations of when the fix gets overwritten and how to restore it
- Add user-friendly output with emojis and clear messaging
- Document the automatic fix process with step-by-step explanations

This provides complete transparency about what the scripts do and why,
making it easy for developers to understand and maintain the fix.

scripts/build-native.sh

@@ -82,12 +82,54 @@ build_android() {
         log_warn "This appears to be a plugin development project"
         log_warn "Android test app not properly initialized"
         
-        # Fix capacitor.build.gradle if needed
+        # =============================================================================
+        # AUTOMATIC FIX: capacitor.build.gradle for Plugin Development Projects
+        # =============================================================================
+        # 
+        # PROBLEM: The capacitor.build.gradle file is auto-generated by Capacitor CLI
+        # and includes a line that tries to load a file that doesn't exist in plugin
+        # development projects:
+        #   apply from: "../capacitor-cordova-android-plugins/cordova.variables.gradle"
+        #
+        # WHY THIS HAPPENS: 
+        # - This file is generated by 'npx cap sync', 'npx cap update', etc.
+        # - It assumes a full Capacitor app with proper plugin integration
+        # - Plugin development projects don't have the full Capacitor setup
+        #
+        # THE FIX:
+        # - Comment out the problematic line to prevent build failures
+        # - Add explanatory comment about why it's commented out
+        # - This fix gets applied automatically every time the build script runs
+        #
+        # WHEN THIS FIX GETS OVERWRITTEN:
+        # - Running 'npx cap sync' will regenerate the file and remove our fix
+        # - Running 'npx cap update' will regenerate the file and remove our fix
+        # - Running 'npx cap add android' will regenerate the file and remove our fix
+        #
+        # HOW TO RESTORE THE FIX:
+        # - Run this build script again (it will reapply the fix automatically)
+        # - Or run: ./scripts/fix-capacitor-build.sh
+        # - Or manually comment out the problematic line
+        #
+        # =============================================================================
+        
         if [ -f "app/capacitor.build.gradle" ]; then
             if grep -q "^apply from: \"../capacitor-cordova-android-plugins/cordova.variables.gradle\"" "app/capacitor.build.gradle"; then
-                log_info "Fixing capacitor.build.gradle for plugin development project..."
+                log_info "🔧 Applying automatic fix to capacitor.build.gradle..."
+                log_info "   Reason: Plugin development project missing Capacitor integration files"
+                log_info "   Fix: Commenting out problematic 'apply from' line"
+                
+                # Apply the fix by commenting out the problematic line
                 sed -i 's/^apply from: "\.\.\/capacitor-cordova-android-plugins\/cordova\.variables\.gradle"/\/\/ Plugin development project - no Capacitor integration files needed\n\/\/ &/' "app/capacitor.build.gradle"
+                
+                log_info "✅ Fix applied successfully"
+                log_warn "⚠️  Note: This fix will be lost if you run 'npx cap sync' or 'npx cap update'"
+                log_info "💡 To restore the fix later, run this build script again or use: ./scripts/fix-capacitor-build.sh"
+            else
+                log_info "ℹ️  capacitor.build.gradle already has the fix applied"
             fi
+        else
+            log_warn "⚠️  capacitor.build.gradle not found - this may indicate a different project structure"
         fi
         
         log_warn "Plugin source code has been built successfully"

scripts/fix-capacitor-build.sh

@@ -1,22 +1,75 @@
 #!/bin/bash
 
-# Fix for capacitor.build.gradle in plugin development projects
-# This script should be run after any 'npx cap sync' or 'npx cap update'
+# =============================================================================
+# FIX SCRIPT: capacitor.build.gradle for Plugin Development Projects
+# =============================================================================
+# 
+# PURPOSE: This script fixes a common issue in Capacitor plugin development
+# projects where the auto-generated capacitor.build.gradle file tries to load
+# a file that doesn't exist, causing build failures.
+#
+# WHEN TO USE:
+# - After running 'npx cap sync'
+# - After running 'npx cap update'  
+# - After running 'npx cap add android'
+# - After any Capacitor CLI command that regenerates integration files
+# - When you get build errors about missing cordova.variables.gradle
+#
+# WHAT IT DOES:
+# - Finds the problematic line in capacitor.build.gradle
+# - Comments it out with an explanatory comment
+# - Prevents build failures in plugin development projects
+#
+# THE PROBLEM:
+# Capacitor generates this line in capacitor.build.gradle:
+#   apply from: "../capacitor-cordova-android-plugins/cordova.variables.gradle"
+# But plugin development projects don't have this file, causing:
+#   "Could not read script '.../cordova.variables.gradle' as it does not exist"
+#
+# THE FIX:
+# Comments out the problematic line and adds explanation:
+#   // Plugin development project - no Capacitor integration files needed
+#   // apply from: "../capacitor-cordova-android-plugins/cordova.variables.gradle"
+#
+# =============================================================================
 
 set -e
 
 CAPACITOR_BUILD_GRADLE="android/app/capacitor.build.gradle"
 
+echo "🔧 DailyNotification Plugin - Capacitor Build Fix Script"
+echo "========================================================"
+
 if [ -f "$CAPACITOR_BUILD_GRADLE" ]; then
-    echo "🔧 Fixing capacitor.build.gradle for plugin development project..."
+    echo "📁 Found capacitor.build.gradle at: $CAPACITOR_BUILD_GRADLE"
     
-    # Comment out the problematic line if it exists and isn't already commented
+    # Check if the problematic line exists and isn't already commented
     if grep -q "^apply from: \"../capacitor-cordova-android-plugins/cordova.variables.gradle\"" "$CAPACITOR_BUILD_GRADLE"; then
+        echo "🔧 Applying fix to capacitor.build.gradle..."
+        echo "   Problem: Line tries to load non-existent cordova.variables.gradle"
+        echo "   Solution: Commenting out the problematic line"
+        
+        # Apply the fix by commenting out the problematic line
         sed -i 's/^apply from: "\.\.\/capacitor-cordova-android-plugins\/cordova\.variables\.gradle"/\/\/ Plugin development project - no Capacitor integration files needed\n\/\/ &/' "$CAPACITOR_BUILD_GRADLE"
-        echo "✅ Fixed capacitor.build.gradle"
+        
+        echo "✅ Fix applied successfully!"
+        echo "💡 The problematic line has been commented out with an explanation"
+        echo "⚠️  Note: This fix will be lost if you run Capacitor CLI commands again"
+        echo "🔄 To restore the fix later, run this script again or use the build script"
     else
-        echo "ℹ️  capacitor.build.gradle already fixed or doesn't need fixing"
+        echo "ℹ️  capacitor.build.gradle already has the fix applied or doesn't need fixing"
+        echo "   (The problematic line is either commented out or doesn't exist)"
     fi
 else
-    echo "⚠️  capacitor.build.gradle not found at $CAPACITOR_BUILD_GRADLE"
+    echo "⚠️  capacitor.build.gradle not found at: $CAPACITOR_BUILD_GRADLE"
+    echo "   This may indicate:"
+    echo "   - You're not in the correct directory"
+    echo "   - The Android project structure is different"
+    echo "   - The file hasn't been generated yet"
 fi
+
+echo ""
+echo "📚 For more information, see:"
+echo "   - BUILDING.md (troubleshooting section)"
+echo "   - scripts/build-native.sh (automatic fix documentation)"
+echo "========================================================"