name: Build Android APK

on:
  push:
    branches:
      - main
      - master
      - 'refactor/**'
    tags:
      - 'v*'
  pull_request:
    branches:
      - main
      - master
  workflow_dispatch:

jobs:
  build-android:
    name: Build Release APKs
    runs-on: ubuntu-latest
    container:
      image: ghcr.io/cirruslabs/flutter:3.19.3
      options: --privileged
    steps:
      - name: Setup Node.js 20 & ARM64 Flutter Engine
        run: |
          ARCH=$(uname -m)
          if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then NODE_ARCH="arm64"; else NODE_ARCH="x64"; fi
          curl -fsSL "https://nodejs.org/dist/v20.18.0/node-v20.18.0-linux-${NODE_ARCH}.tar.gz" | tar -xzf - -C /usr/local --strip-components=1
          node --version
          git config --global --add safe.directory "$GITHUB_WORKSPACE"
          git config --global --add safe.directory '*'

          # On Linux ARM64, Flutter engine and Android AAPT2 need x86_64 emulation via QEMU.
          if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then
            echo "Setting up ARM64 Flutter environment & QEMU binfmt emulation..."
            apt-get update -qq && apt-get install -y -qq qemu-user-static binfmt-support libc6-amd64-cross libstdc++6-amd64-cross

            # Mount binfmt_misc pseudo-filesystem (supported under --privileged)
            mkdir -p /proc/sys/fs/binfmt_misc
            if ! grep -qs '/proc/sys/fs/binfmt_misc' /proc/mounts; then
              mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc 2>/dev/null || true
            fi

            # Cleanly unregister any conflicting or broken host binfmt handlers (e.g. host FEX)
            if [ -f /proc/sys/fs/binfmt_misc/register ]; then
              echo "=== Active binfmt_misc handlers before cleanup ==="
              ls -la /proc/sys/fs/binfmt_misc/ || true
              for entry in /proc/sys/fs/binfmt_misc/*; do
                [ -f "$entry" ] || continue
                name="$(basename "$entry")"
                [ "$name" = "register" ] && continue
                [ "$name" = "status" ] && continue
                if grep -qi "fex" "$entry" 2>/dev/null || [ "$name" = "FEX-x86_64" ] || [ "$name" = "fex-x86_64" ] || [ "$name" = "x86_64" ] || [ "$name" = "qemu-x86_64" ]; then
                  echo "Unregistering conflicting binfmt handler: $name"
                  echo -1 > "$entry" 2>/dev/null || true
                fi
              done

              # Register QEMU x86_64 emulator directly with OCF flags (Fix-binary)
              echo ':qemu-x86_64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x3e\x00:\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-x86_64-static:OCF' > /proc/sys/fs/binfmt_misc/register 2>/dev/null || true
              echo "=== Active binfmt_misc handlers after registration ==="
              ls -la /proc/sys/fs/binfmt_misc/ || true
            fi

            # Setup x86_64 dynamic libraries & prefix for QEMU emulation of AAPT2 and tools
            mkdir -p /etc/qemu-binfmt
            ln -sf /usr/x86_64-linux-gnu /etc/qemu-binfmt/x86_64
            mkdir -p /lib64 /usr/lib64
            ln -sf /usr/x86_64-linux-gnu/lib/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2
            ln -sf /usr/x86_64-linux-gnu/lib/* /lib64/ 2>/dev/null || true
            ln -sf /usr/x86_64-linux-gnu/lib/* /usr/lib64/ 2>/dev/null || true

            export QEMU_LD_PREFIX=/usr/x86_64-linux-gnu
            echo "QEMU_LD_PREFIX=/usr/x86_64-linux-gnu" >> "$GITHUB_ENV"

            QEMU_BIN=$(command -v qemu-x86_64-static || command -v qemu-x86_64)

            # Dummy fallbacks for FEX binaries/sockets to eliminate unexpected errors
            for fex in /usr/bin/FEXInterpreter /usr/bin/FEX /usr/local/bin/FEXInterpreter /usr/bin/FEXServer /usr/local/bin/FEXServer; do
              printf '#!/bin/sh\nexit 0\n' > "$fex"
              chmod +x "$fex" 2>/dev/null || true
            done

            flutter precache --android
            for dir in /sdks/flutter/bin/cache/artifacts/engine/android-*; do
              if [ -d "$dir/linux-x64" ]; then
                mkdir -p "$dir/linux-arm64"
                printf '#!/bin/sh\nSCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"\nexec %s -L /usr/x86_64-linux-gnu "$SCRIPT_DIR/../linux-x64/gen_snapshot" "$@"\n' "$QEMU_BIN" > "$dir/linux-arm64/gen_snapshot"
                chmod +x "$dir/linux-arm64/gen_snapshot"
                echo "Configured gen_snapshot wrapper for $(basename "$dir")"
              fi
            done
          fi

      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Make Gradlew Executable
        run: |
          if [ -f android/gradlew ]; then
            chmod +x android/gradlew
          fi

      - name: Inspect Build Environment
        run: |
          flutter --version
          java -version
          node --version

      - name: Fetch Flutter Dependencies
        run: flutter pub get

      - name: Run Code Analysis & Tests
        run: |
          flutter analyze
          flutter test

      - name: Build Universal Release APK
        run: |
          ARCH=$(uname -m)
          if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then
            (
              while true; do
                for aapt2_bin in $(find /root/.gradle /opt/android-sdk-linux -type f -name "aapt2" 2>/dev/null); do
                  if [ -f "$aapt2_bin" ] && ! [ -f "${aapt2_bin}.orig" ]; then
                    if head -c 4 "$aapt2_bin" 2>/dev/null | grep -q 'ELF'; then
                      echo "Wrapping newly extracted AAPT2: $aapt2_bin"
                      mv "$aapt2_bin" "${aapt2_bin}.orig"
                      printf '#!/bin/sh\nexec /usr/bin/qemu-x86_64-static -L /usr/x86_64-linux-gnu "$0.orig" "$@"\n' > "$aapt2_bin"
                      chmod +x "$aapt2_bin" "${aapt2_bin}.orig"
                    fi
                  fi
                done
                sleep 0.5
              done
            ) &
            AAPT2_WATCHER_PID=$!
            echo "AAPT2 Watcher started with PID $AAPT2_WATCHER_PID"
          fi

          flutter build apk --release

          if [ -n "$AAPT2_WATCHER_PID" ]; then
            kill "$AAPT2_WATCHER_PID" 2>/dev/null || true
          fi

      - name: Build Split-per-ABI Release APKs
        run: |
          ARCH=$(uname -m)
          if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then
            (
              while true; do
                for aapt2_bin in $(find /root/.gradle /opt/android-sdk-linux -type f -name "aapt2" 2>/dev/null); do
                  if [ -f "$aapt2_bin" ] && ! [ -f "${aapt2_bin}.orig" ]; then
                    if head -c 4 "$aapt2_bin" 2>/dev/null | grep -q 'ELF'; then
                      echo "Wrapping newly extracted AAPT2: $aapt2_bin"
                      mv "$aapt2_bin" "${aapt2_bin}.orig"
                      printf '#!/bin/sh\nexec /usr/bin/qemu-x86_64-static -L /usr/x86_64-linux-gnu "$0.orig" "$@"\n' > "$aapt2_bin"
                      chmod +x "$aapt2_bin" "${aapt2_bin}.orig"
                    fi
                  fi
                done
                sleep 0.5
              done
            ) &
            AAPT2_WATCHER_PID=$!
          fi

          flutter build apk --release --split-per-abi

          if [ -n "$AAPT2_WATCHER_PID" ]; then
            kill "$AAPT2_WATCHER_PID" 2>/dev/null || true
          fi

      - name: Organize Artifacts
        run: |
          mkdir -p release-apks
          # Copy universal APK
          if [ -f build/app/outputs/flutter-apk/app-release.apk ]; then
            cp build/app/outputs/flutter-apk/app-release.apk release-apks/oggauer-gemeindetrommler-universal-release.apk
          fi
          # Copy split APKs
          if [ -f build/app/outputs/flutter-apk/app-arm64-v8a-release.apk ]; then
            cp build/app/outputs/flutter-apk/app-arm64-v8a-release.apk release-apks/oggauer-gemeindetrommler-arm64-v8a.apk
          fi
          if [ -f build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk ]; then
            cp build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk release-apks/oggauer-gemeindetrommler-armeabi-v7a.apk
          fi
          if [ -f build/app/outputs/flutter-apk/app-x86_64-release.apk ]; then
            cp build/app/outputs/flutter-apk/app-x86_64-release.apk release-apks/oggauer-gemeindetrommler-x86_64.apk
          fi
          echo "=== Generated APK Artifacts ==="
          ls -lah release-apks/

      - name: Upload APKs to Gitea Artifacts
        uses: actions/upload-artifact@v4
        with:
          name: oggauer-gemeindetrommler-apks
          path: release-apks/*.apk
          retention-days: 30