# SPDX-License-Identifier: GPL-3.0-or-later
name: CI

on:
  pull_request:
    branches: [main]

# A new push to a PR cancels any in-flight run for that PR.
concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

env:
  # SDK packages this project builds against (compileSdk 37 / build-tools 37.0.0).
  # Quote the package ids when passed to sdkmanager — the ';' is a shell separator.
  ANDROID_PLATFORM: "platforms;android-37.0"
  ANDROID_BUILD_TOOLS: "build-tools;37.0.0"

jobs:
  debug-build:
    name: Debug build
    # x86_64: Linux-arm64 runners can't set up this SDK — android-actions/setup-android's sdkmanager
    # fails (exit 1) on the android-37.0 preview platform, and the emulator package has no arm64-Linux
    # build. Build/unit-test results are host-arch-independent anyway (R8/AGP/JVM); real arm64
    # device-ABI coverage would need arm64 emulators, which require macOS hosts.
    runs-on: ubuntu-latest
    steps:
      - name: Check out source
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Set up JDK 21
        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
        with:
          distribution: temurin
          java-version: "21"

      - name: Set up Android SDK
        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1

      - name: Install SDK platform and build-tools
        run: sdkmanager "$ANDROID_PLATFORM" "$ANDROID_BUILD_TOOLS"

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0

      - name: Assemble debug APK
        run: ./gradlew assembleDebug --stacktrace

      - name: Upload debug APK
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: debug-apk
          path: app/build/outputs/apk/debug/*.apk
          if-no-files-found: error

  unit-tests:
    name: Unit tests
    runs-on: ubuntu-latest
    steps:
      - name: Check out source
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Set up JDK 21
        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
        with:
          distribution: temurin
          java-version: "21"

      - name: Set up Android SDK
        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1

      - name: Install SDK platform and build-tools
        run: sdkmanager "$ANDROID_PLATFORM" "$ANDROID_BUILD_TOOLS"

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0

      - name: Run unit tests
        run: ./gradlew testDebugUnitTest --stacktrace

      - name: Upload unit test report
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: unit-test-report
          path: app/build/reports/tests/testDebugUnitTest/
          if-no-files-found: warn

      # JaCoCo XML + HTML coverage for the JVM unit tests (issue #192). Reporting only — no
      # threshold gate yet, so a coverage regression does not fail CI (a jacocoTestCoverageVerification
      # gate is a natural follow-up once there's a baseline to enforce).
      - name: Generate JaCoCo coverage report
        if: ${{ !cancelled() }}
        run: ./gradlew :app:jacocoTestReport --stacktrace

      - name: Upload coverage report
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: jacoco-coverage-report
          path: app/build/reports/jacoco/jacocoTestReport/
          if-no-files-found: warn

  static-analysis:
    name: Static analysis
    runs-on: ubuntu-latest
    steps:
      - name: Check out source
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Set up JDK 21
        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
        with:
          distribution: temurin
          java-version: "21"

      # AGP configuration needs the SDK even for ktlint/detekt (they run on the :app module).
      - name: Set up Android SDK
        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1

      - name: Install SDK platform and build-tools
        run: sdkmanager "$ANDROID_PLATFORM" "$ANDROID_BUILD_TOOLS"

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0

      # --continue so a ktlint failure still lets detekt report (and vice versa).
      - name: Run ktlint and detekt
        run: ./gradlew :app:ktlintCheck :app:detekt --continue --stacktrace

      - name: Upload analysis reports
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: static-analysis-reports
          path: |
            app/build/reports/ktlint/
            app/build/reports/detekt/
          if-no-files-found: warn

  e2e:
    name: E2E
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        # Every Android API level across the rolling ~7-year support window: minSdk (29 / Android 10,
        # 2019) through the latest stable. Each level boots its own emulator and runs the full
        # instrumented + Compose UI (E2E) suite; all of them fan in to the "CI passed" gate. When a
        # new Android ships, add it and drop the oldest level that has aged out of ~7 years. API 37
        # (preview) is NOT in this matrix because emulator-runner can't provision its nonstandard
        # android-37.0 / google_apis_ps16k image (it would wedge the gate) — it's covered separately
        # by the custom-provisioned `e2e-preview` job below. Keep in sync with
        # testOptions.managedDevices in app/build.gradle.kts.
        api-level: [29, 30, 31, 32, 33, 34, 35, 36]
    steps:
      - name: Check out source
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Set up JDK 21
        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
        with:
          distribution: temurin
          java-version: "21"

      - name: Set up Android SDK
        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1

      - name: Install SDK platform and build-tools
        run: sdkmanager "$ANDROID_PLATFORM" "$ANDROID_BUILD_TOOLS"

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0

      # The hardware-accelerated emulator needs KVM, which is gated behind a udev rule.
      - name: Enable KVM
        run: |
          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
          sudo udevadm control --reload-rules
          sudo udevadm trigger --name-match=kvm

      - name: Cache AVD snapshot
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        id: avd-cache
        with:
          path: |
            ~/.android/avd/*
            ~/.android/adb*
          key: avd-${{ matrix.api-level }}-google_apis-x86_64

      # On a cache miss, cold-boot the emulator once so its snapshot can be cached,
      # making subsequent runs start from a warm snapshot.
      - name: Create AVD and generate snapshot for caching
        if: steps.avd-cache.outputs.cache-hit != 'true'
        uses: reactivecircus/android-emulator-runner@e89f39f1abbbd05b1113a29cf4db69e7540cae5a # v2.37.0
        with:
          api-level: ${{ matrix.api-level }}
          target: google_apis
          arch: x86_64
          force-avd-creation: false
          emulator-options: -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
          disable-animations: false
          script: echo "Generated AVD snapshot for caching."

      # reactivecircus/android-emulator-runner runs an un-guarded, fatal `adb shell input keyevent 82`
      # after boot. On snapshot resume that can race system_server (sys.boot_completed=1 before the
      # `input` binder service is republished), aborting the job before Gradle runs with
      # "No service published for: input" — an ~2%, API-29-only infra flake, not a test failure. Make
      # the step non-fatal and retry once: two independent boots drop the race to ~0.04%. The definitive
      # fix (adopt the e2e-preview job's manual-boot + `keyevent 82 || true`) is tracked separately.
      - name: Run E2E tests
        id: e2e
        continue-on-error: true
        uses: reactivecircus/android-emulator-runner@e89f39f1abbbd05b1113a29cf4db69e7540cae5a # v2.37.0
        with:
          api-level: ${{ matrix.api-level }}
          target: google_apis
          arch: x86_64
          force-avd-creation: false
          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
          disable-animations: true
          script: ./gradlew connectedDebugAndroidTest --stacktrace

      - name: Run E2E tests (retry after emulator boot race)
        if: steps.e2e.outcome == 'failure'
        uses: reactivecircus/android-emulator-runner@e89f39f1abbbd05b1113a29cf4db69e7540cae5a # v2.37.0
        with:
          api-level: ${{ matrix.api-level }}
          target: google_apis
          arch: x86_64
          force-avd-creation: false
          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
          disable-animations: true
          script: ./gradlew connectedDebugAndroidTest --stacktrace

      - name: Upload E2E test report
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: e2e-test-report-api${{ matrix.api-level }}
          path: app/build/reports/androidTests/connected/
          if-no-files-found: warn

  # API 37 (Android 17, preview) E2E. Its only system image is the nonstandard
  # android-37.0 / google_apis_ps16k (16 KB page size), which reactivecircus/android-emulator-runner
  # can't provision (it builds android-37 / google_apis, neither of which exists), so this job
  # CUSTOM-PROVISIONS the emulator with sdkmanager/avdmanager/emulator directly. It is REQUIRED:
  # part of the "CI passed" gate's needs (the preview emulator has proven stable in practice), so a
  # genuine failure blocks merges. When a stable, emulator-runner-friendly API 37 image ships, fold
  # 37 into the main `e2e` matrix and delete this job.
  e2e-preview:
    name: E2E (API 37 preview)
    runs-on: ubuntu-latest
    timeout-minutes: 35
    env:
      API37_IMAGE: "system-images;android-37.0;google_apis_ps16k;x86_64"
    steps:
      - name: Check out source
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Set up JDK 21
        uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
        with:
          distribution: temurin
          java-version: "21"

      - name: Set up Android SDK
        uses: android-actions/setup-android@40fd30fb8d7440372e1316f5d1809ec01dcd3699 # v4.0.1

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0

      # The hardware-accelerated emulator needs KVM, which is gated behind a udev rule.
      - name: Enable KVM
        run: |
          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
          sudo udevadm control --reload-rules
          sudo udevadm trigger --name-match=kvm

      # Cache the ~1 GB preview system image so only the first run pays the download.
      - name: Cache API 37 system image
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          # GitHub-hosted ubuntu runners install the SDK at /usr/local/lib/android/sdk; caching the
          # image dir (with its package metadata) lets sdkmanager treat it as installed and skip the
          # re-download on a cache hit.
          path: /usr/local/lib/android/sdk/system-images/android-37.0
          key: sysimg-android-37.0-google_apis_ps16k-x86_64

      - name: Install SDK packages + preview system image
        run: sdkmanager "$ANDROID_PLATFORM" "$ANDROID_BUILD_TOOLS" "platform-tools" "emulator" "$API37_IMAGE"

      - name: Create API 37 AVD
        run: |
          # avdmanager and the emulator disagree on the default AVD dir when ANDROID_SDK_HOME is set
          # on the runner (avdmanager writes $ANDROID_SDK_HOME/.android/avd; the emulator looks in
          # $ANDROID_SDK_HOME/avd), which made the boot step report "Unknown AVD name [api37]". Pin
          # ANDROID_AVD_HOME so both agree, and carry it to the boot step via $GITHUB_ENV.
          export ANDROID_AVD_HOME="$HOME/.android/avd"
          echo "ANDROID_AVD_HOME=$ANDROID_AVD_HOME" >> "$GITHUB_ENV"
          mkdir -p "$ANDROID_AVD_HOME"
          echo "no" | avdmanager create avd -n api37 -k "$API37_IMAGE" -d pixel_2 --force
          echo "AVDs visible to the emulator:"; "$ANDROID_SDK_ROOT/emulator/emulator" -list-avds

      - name: Boot emulator and run E2E
        run: |
          set -euo pipefail
          EMU_LOG="${RUNNER_TEMP:-/tmp}/emulator.log"

          boot_emulator() {
            echo "::group::Start API 37 emulator (attempt $1)"
            # Capture the emulator's own output — without this a boot failure is invisible.
            "$ANDROID_SDK_ROOT/emulator/emulator" -avd api37 \
              -no-window -no-audio -no-boot-anim -no-snapshot -accel on \
              -gpu swiftshader_indirect -camera-back none -camera-front none > "$EMU_LOG" 2>&1 &
            # ONE bounded wait covering both device registration and full boot, so a stuck emulator
            # fails fast instead of hanging the whole job until the 35-min cap (the original bug).
            if timeout 300 adb wait-for-device shell \
                'while [ "$(getprop sys.boot_completed | tr -d "\r")" != "1" ]; do sleep 2; done'; then
              echo "::endgroup::"; return 0
            fi
            echo "::endgroup::"
            echo "::warning::API 37 emulator did not boot within 300s (attempt $1)"
            adb devices || true
            echo "--- emulator.log (tail) ---"; tail -120 "$EMU_LOG" || true
            adb emu kill 2>/dev/null || true
            sleep 5
            return 1
          }

          booted=0
          for attempt in 1 2; do boot_emulator "$attempt" && { booted=1; break; }; done
          [ "$booted" = "1" ] || { echo "::error::API 37 preview emulator failed to boot after 2 attempts"; exit 1; }

          adb shell input keyevent 82 || true
          ./gradlew connectedDebugAndroidTest --stacktrace

      - name: Dump emulator log on failure
        if: failure()
        run: |
          echo "--- emulator.log ---"; tail -200 "${RUNNER_TEMP:-/tmp}/emulator.log" 2>/dev/null || echo "(none)"
          echo "--- logcat ---"; adb logcat -d 2>/dev/null | tail -120 || echo "(device unavailable)"

      - name: Shut down emulator
        if: always()
        run: adb emu kill || true

      - name: Upload E2E (API 37) report
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: e2e-test-report-api37-preview
          path: app/build/reports/androidTests/connected/
          if-no-files-found: warn

  # Single aggregating gate so branch protection can require ALL CI jobs with one stable status
  # check. It depends on every job — including each api-level of the E2E matrix — so adding/removing
  # a matrix level needs no change to branch protection (the per-"(api-level)" check names would
  # otherwise have to be re-listed each time).
  ci-passed:
    name: CI passed
    if: always()
    needs: [static-analysis, debug-build, unit-tests, e2e, e2e-preview]
    runs-on: ubuntu-latest
    steps:
      - name: Verify every required job succeeded
        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
        run: |
          echo "Required CI jobs did not all succeed:"
          echo "  static-analysis: ${{ needs.static-analysis.result }}"
          echo "  debug-build: ${{ needs.debug-build.result }}"
          echo "  unit-tests:  ${{ needs.unit-tests.result }}"
          echo "  e2e:         ${{ needs.e2e.result }}"
          echo "  e2e-preview: ${{ needs.e2e-preview.result }}"
          exit 1