name: Android build

permissions:
  contents: write
  releases: write

on:
  push:
    branches:
      - '**'
  pull_request:
  release:
    types:
      - published
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    timeout-minutes: 60

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

      - name: Set up Java 17
        uses: actions/setup-java@v5
        with:
          distribution: temurin
          java-version: '17'

      - name: Install Android SDK command-line tools and packages
        shell: bash
        run: |
          set -euxo pipefail
          export ANDROID_SDK_ROOT="$HOME/.android/sdk"
          export ANDROID_HOME="$ANDROID_SDK_ROOT"
          mkdir -p "$ANDROID_SDK_ROOT/cmdline-tools"
          if [ ! -x "$ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager" ]; then
            tools_url="$(curl -fsSL https://developer.android.com/studio | grep -o 'https://dl.google.com/android/repository/commandlinetools-linux-[0-9][0-9]*_latest.zip' | head -n 1)"
            test -n "$tools_url"
            curl -fsSL -o /tmp/commandlinetools.zip "$tools_url"
            rm -rf "$ANDROID_SDK_ROOT/cmdline-tools/latest" "$ANDROID_SDK_ROOT/cmdline-tools/cmdline-tools"
            unzip -q /tmp/commandlinetools.zip -d "$ANDROID_SDK_ROOT/cmdline-tools"
            mv "$ANDROID_SDK_ROOT/cmdline-tools/cmdline-tools" "$ANDROID_SDK_ROOT/cmdline-tools/latest"
          fi
          export PATH="$ANDROID_SDK_ROOT/cmdline-tools/latest/bin:$ANDROID_SDK_ROOT/platform-tools:$PATH"
          set +o pipefail
          yes | sdkmanager --licenses >/dev/null
          set -o pipefail
          sdkmanager \
            "platform-tools" \
            "platforms;android-36" \
            "build-tools;36.0.0"

      - name: Prepare optional release signing
        if: github.event_name == 'release'
        continue-on-error: true
        env:
          ANDROID_KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
          ANDROID_KEY_ALIAS: ${{ secrets.ANDROID_KEY_ALIAS }}
          ANDROID_KEY_PASSWORD: ${{ secrets.ANDROID_KEY_PASSWORD }}
        shell: bash
        run: |
          set -euo pipefail
          missing=()
          for key in ANDROID_KEYSTORE_BASE64 ANDROID_KEYSTORE_PASSWORD ANDROID_KEY_ALIAS ANDROID_KEY_PASSWORD; do
            if [ -z "${!key:-}" ]; then
              missing+=("$key")
            fi
          done

          if [ ${#missing[@]} -gt 0 ]; then
            printf -v missing_csv '%s, ' "${missing[@]}"
            missing_csv="${missing_csv%, }"
            echo "::error::Release signing secrets missing: ${missing_csv}. Continuing with unsigned/default-signed release AAB."
            exit 1
          fi

          mkdir -p .ci-secrets
          printf '%s' "$ANDROID_KEYSTORE_BASE64" | base64 -d > .ci-secrets/release-keystore.jks
          cat > keystore.properties <<EOF
          storeFile=.ci-secrets/release-keystore.jks
          storePassword=$ANDROID_KEYSTORE_PASSWORD
          keyAlias=$ANDROID_KEY_ALIAS
          keyPassword=$ANDROID_KEY_PASSWORD
          EOF

      - name: Make Gradle wrapper executable
        run: chmod +x gradlew

      - name: Write Android SDK location
        shell: bash
        run: |
          set -euxo pipefail
          printf 'sdk.dir=%s/.android/sdk\n' "$HOME" > local.properties

      - name: Prepare CI build metadata
        id: build_meta
        shell: bash
        run: |
          set -euxo pipefail
          timestamp_utc="$(date -u +%Y%m%d-%H%M%S)"
          version_code="$(date -u +%s)"
          project_name="$(basename "$GITHUB_REPOSITORY")"
          python3 - "$version_code" <<'PY'
          from pathlib import Path
          import re, sys
          path = Path('app/build.gradle.kts')
          text = path.read_text(encoding='utf-8')
          new_text, count = re.subn(r'(\bversionCode\s*=\s*)\d+', rf'\g<1>{sys.argv[1]}', text, count=1)
          if count != 1:
              raise SystemExit('versionCode not found in app/build.gradle.kts')
          path.write_text(new_text, encoding='utf-8')
          PY
          echo "Using CI versionCode: $version_code"
          echo "project_name=$project_name" >> "$GITHUB_OUTPUT"
          echo "timestamp_utc=$timestamp_utc" >> "$GITHUB_OUTPUT"
          echo "version_code=$version_code" >> "$GITHUB_OUTPUT"

      - name: Build debug APK
        if: github.event_name != 'release'
        shell: bash
        run: |
          set -euxo pipefail
          export ANDROID_SDK_ROOT="$HOME/.android/sdk"
          export ANDROID_HOME="$ANDROID_SDK_ROOT"
          ./gradlew --no-daemon clean assembleDebug

      - name: Build release AAB
        if: github.event_name == 'release'
        shell: bash
        run: |
          set -euxo pipefail
          export ANDROID_SDK_ROOT="$HOME/.android/sdk"
          export ANDROID_HOME="$ANDROID_SDK_ROOT"
          ./gradlew --no-daemon bundleRelease

      - name: Rename release AAB for upload
        if: github.event_name == 'release'
        id: release_aab
        shell: bash
        run: |
          set -euxo pipefail
          aab="$(find app/build/outputs/bundle/release -name '*.aab' | head -n 1)"
          renamed="app/build/outputs/bundle/release/${{ steps.build_meta.outputs.project_name }}-${{ steps.build_meta.outputs.timestamp_utc }}-release.aab"
          mv -f "$aab" "$renamed"
          echo "Renamed release AAB to $(basename "$renamed")"
          echo "path=$renamed" >> "$GITHUB_OUTPUT"

      - name: Upload debug APK
        if: github.event_name != 'release'
        uses: actions/upload-artifact@v3
        with:
          name: debug-apk
          path: app/build/outputs/apk/debug/*.apk
          if-no-files-found: error

      - name: Attach release AAB to Gitea release
        if: github.event_name == 'release'
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          GITHUB_TOKEN: ${{ github.token }}
        shell: bash
        run: |
          set -euxo pipefail
          token="${GITHUB_TOKEN:-${GITEA_TOKEN:-}}"
          if [ -z "$token" ]; then
            echo "::error::No release upload token is available from secrets.GITEA_TOKEN or github.token"
            exit 1
          fi
          release_id="$(python3 -c 'import json, os; print(json.load(open(os.environ["GITHUB_EVENT_PATH"], encoding="utf-8"))["release"]["id"])')"
          aab="${{ steps.release_aab.outputs.path }}"
          curl --fail-with-body \
            --request POST \
            --header "Authorization: token ${token}" \
            --form "attachment=@${aab}" \
            "${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}/releases/${release_id}/assets?name=$(basename "$aab")"