name: APK Diff

on:
  pull_request:

permissions:
  contents: read # to fetch code (actions/checkout)
  pull-requests: write # to comment on PR

env:
  NDK_VERSION: '27.0.12077973'

jobs:
  assemble-base:
    if: ${{ github.repository != 'signalapp/Signal-Android' }}
    runs-on: ubuntu-latest-8-cores
    
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: true
        ref: ${{ github.event.pull_request.base.sha }}

    - name: set up JDK 17
      uses: actions/setup-java@v3
      with:
        distribution: temurin
        java-version: 17
        cache: gradle

    - name: Install NDK
      run: echo "y" | ${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin/sdkmanager --install "ndk;${{ env.NDK_VERSION }}"

    - name: Validate Gradle Wrapper
      uses: gradle/wrapper-validation-action@v1

    - name: Cache base apk
      id: cache-base
      uses: actions/cache@v3
      with:
        path: diffuse-base.apk
        key: diffuse-${{ github.event.pull_request.base.sha }}

    - name: Build with Gradle
      if: steps.cache-base.outputs.cache-hit != 'true'
      run: ./gradlew assemblePlayProdRelease

    - name: Copy base apk
      if: steps.cache-base.outputs.cache-hit != 'true'
      run: mv app/build/outputs/apk/playProd/release/*arm64*.apk diffuse-base.apk

    - uses: actions/checkout@v3
      with:
        submodules: true
        clean: 'false'

    - name: Build with Gradle
      run: ./gradlew assemblePlayProdRelease

    - name: Copy PR apk
      run: mv app/build/outputs/apk/playProd/release/*arm64*.apk diffuse-new.apk

    - id: diffuse
      uses: usefulness/diffuse-action@v1
      with:
        old-file-path: diffuse-base.apk
        new-file-path: diffuse-new.apk

    - uses: peter-evans/find-comment@v2
      id: find-comment
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: Diffuse output

    - uses: peter-evans/create-or-update-comment@v3
      with:
        body: |
          Diffuse output:

          ${{ steps.diffuse.outputs.diff-gh-comment }}
        edit-mode: replace
        comment-id: ${{ steps.find-comment.outputs.comment-id }}
        issue-number: ${{ github.event.pull_request.number }}
        token: ${{ secrets.GITHUB_TOKEN }}

    - uses: actions/upload-artifact@v4
      with:
        name: diffuse-output
        path: ${{ steps.diffuse.outputs.diff-file }}