name: PR build check

on:
  pull_request:
    paths-ignore:
      - '**.md'
      - '.github/workflows/issue_moderator.yml'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

env:
  CI_CHUNK_SIZE: 65

jobs:
  prepare:
    name: Prepare job
    runs-on: ubuntu-latest
    outputs:
      individualMatrix: ${{ steps.generate-matrices.outputs.individualMatrix }}
      multisrcMatrix: ${{ steps.generate-matrices.outputs.multisrcMatrix }}
      isIndividualChanged: ${{ steps.parse-changed-files.outputs.isIndividualChanged }}
      isMultisrcChanged: ${{ steps.parse-changed-files.outputs.isMultisrcChanged }}
    env:
      CI_MODULE_GEN: true
    steps:
      - name: Clone repo
        uses: actions/checkout@v3

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

      - name: Set up JDK
        uses: actions/setup-java@v3
        with:
          java-version: 11
          distribution: adopt

      - id: get-changed-files
        name: Get changed files
        uses: Ana06/get-changed-files@v2.2.0

      - id: parse-changed-files
        name: Parse changed files
        run: |
          isIndividualChanged=0
          isMultisrcChanged=0
          for changedFile in ${{ steps.get-changed-files.outputs.all }}; do
            if [[ ${changedFile} == src/* ]]; then
              isIndividualChanged=1
            elif [[ ${changedFile} == multisrc/* ]]; then
              isMultisrcChanged=1
            elif [[ ${changedFile} == .github/workflows/issue_moderator.yml ]]; then
              true
            elif [[ ${changedFile} == *.md ]]; then
              true 
            else
              isIndividualChanged=1
              isMultisrcChanged=1
              break
            fi
          done
          echo "isIndividualChanged=$isIndividualChanged" >> $GITHUB_OUTPUT
          echo "isMultisrcChanged=$isMultisrcChanged" >> $GITHUB_OUTPUT

      - name: Generate multisrc sources
        if: ${{ steps.parse-changed-files.outputs.isMultisrcChanged == '1' }}
        uses: gradle/gradle-command-action@v2
        with:
          arguments: :multisrc:generateExtensions

      - name: Get number of modules
        run: |
          set -x
          ./gradlew -q projects | grep '.*extensions\:\(individual\|multisrc\)\:.*\:.*' > projects.txt

          echo "NUM_INDIVIDUAL_MODULES=$(cat projects.txt | grep '.*\:individual\:.*' | wc -l)" >> $GITHUB_ENV
          echo "NUM_MULTISRC_MODULES=$(cat projects.txt | grep '.*\:multisrc\:.*' | wc -l)" >> $GITHUB_ENV

      - id: generate-matrices
        name: Create output matrices
        uses: actions/github-script@v6
        with:
          script: |
            const numIndividualModules = process.env.NUM_INDIVIDUAL_MODULES;
            const numMultisrcModules = process.env.NUM_MULTISRC_MODULES;
            const chunkSize = process.env.CI_CHUNK_SIZE;

            const numIndividualChunks = Math.ceil(numIndividualModules / chunkSize);
            const numMultisrcChunks = Math.ceil(numMultisrcModules / chunkSize);

            console.log(`Individual modules: ${numIndividualModules} (${numIndividualChunks} chunks of ${chunkSize})`);
            console.log(`Multi-source modules: ${numMultisrcModules} (${numMultisrcChunks} chunks of ${chunkSize})`);

            core.setOutput('individualMatrix', { 'chunk': [...Array(numIndividualChunks).keys()] });
            core.setOutput('multisrcMatrix', { 'chunk': [...Array(numMultisrcChunks).keys()] });

  build_multisrc:
    name: Build multisrc modules
    needs: prepare
    if: ${{ needs.prepare.outputs.isMultisrcChanged == '1' }}
    runs-on: ubuntu-latest
    strategy:
      matrix: ${{ fromJSON(needs.prepare.outputs.multisrcMatrix) }}
    steps:
      - name: Checkout PR
        uses: actions/checkout@v3

      - name: Set up JDK
        uses: actions/setup-java@v3
        with:
          java-version: 11
          distribution: adopt

      - name: Generate sources from the multi-source library
        uses: gradle/gradle-command-action@v2
        env:
          CI_MODULE_GEN: "true"
        with:
          arguments: :multisrc:generateExtensions
          cache-read-only: true

      - name: Build extensions (chunk ${{ matrix.chunk }})
        uses: gradle/gradle-command-action@v2
        env:
          CI_MULTISRC: "true"
          CI_CHUNK_NUM: ${{ matrix.chunk }}
        with:
          arguments: assembleDebug
          cache-read-only: true

  build_individual:
    name: Build individual modules
    needs: prepare
    if: ${{ needs.prepare.outputs.isIndividualChanged == '1' }}
    runs-on: ubuntu-latest
    strategy:
      matrix: ${{ fromJSON(needs.prepare.outputs.individualMatrix) }}
    steps:
      - name: Checkout PR
        uses: actions/checkout@v3

      - name: Set up JDK
        uses: actions/setup-java@v3
        with:
          java-version: 11
          distribution: adopt

      - name: Build extensions (chunk ${{ matrix.chunk }})
        uses: gradle/gradle-command-action@v2
        env:
          CI_MULTISRC: "false"
          CI_CHUNK_NUM: ${{ matrix.chunk }}
        with:
          arguments: assembleDebug
          cache-read-only: true