name: "Release: Generate changelog"
on:
  workflow_dispatch:
    inputs:
      releaseBranch:
        description: 'The name of the release branch, in the format `release/x.y`'
        required: true
      releaseVersion:
        description: 'The version of the release, in the format `x.y`'
        required: true

env:
    GIT_COMMITTER_NAME: 'WooCommerce Bot'
    GIT_COMMITTER_EMAIL: 'no-reply@woocommerce.com'
    GIT_AUTHOR_NAME: 'WooCommerce Bot'
    GIT_AUTHOR_EMAIL: 'no-reply@woocommerce.com'

jobs:
  create-changelog-prs:
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Install PNPM
        run: npm install -g pnpm@^6.24.2

      - name: "Install PHP"
        uses: shivammathur/setup-php@v2
        with:
          php-version: '7.4'
          tools: composer

      - name: "Git fetch the release branch"
        run: git fetch origin ${{ inputs.releaseBranch }}
        
      - name: "Checkout the release branch"
        run: git checkout ${{ inputs.releaseBranch }}
      
      - name: "Create a new branch for the changelog update PR"
        run: git checkout -b ${{ format( 'update/{0}-changelog', inputs.releaseVersion ) }}

      - name: Install dependencies
        run: pnpm install

      - name: "Generate the changelog file"
        run: pnpm changelog --filter=woocommerce -- write --add-pr-num -n -vvv --use-version ${{ inputs.releaseVersion }}
        
      - name: "git rm deleted files"
        run: git rm $(git ls-files --deleted)
        
      - name: "Commit deletion"
        run: git commit -m "Delete changelog files from ${{ inputs.releaseVersion }} release"
        
      - name: "Remember the deletion commit hash"
        id: rev-parse
        run: echo "::set-output name=hash::$(git rev-parse HEAD)"
        
      - name: "Insert NEXT_CHANGELOG contents into readme.txt"
        run: php .github/workflows/scripts/release-changelog.php
      
      - name: "git add readme.txt"
        run: git add plugins/woocommerce/readme.txt
      
      - name: "Commit readme"
        run: git commit -m "Update the readme files for the ${{ inputs.releaseVersion }} release"
        
      - name: "Push update branch to origin"
        run: git push origin ${{ format( 'update/{0}-changelog', inputs.releaseVersion ) }}
        
      - name: "Stash any other undesired changes"
        run: git stash
        
      - name: "Checkout trunk"
        run: git checkout trunk
      
      - name: "Create a branch for the changelog files deletion"
        run: git checkout -b ${{ format( 'delete/{0}-changelog', inputs.releaseVersion ) }}
        
      - name: "Cherry-pick the deletion commit"
        run: git cherry-pick ${{ steps.rev-parse.outputs.hash }}
        
      - name: "Push deletion branch to origin"
        run: git push origin ${{ format( 'delete/{0}-changelog', inputs.releaseVersion ) }}
        
      - name: "Create release branch PR"
        id: release-pr
        uses: actions/github-script@v6
        with:
          script: |
            const result = await github.rest.pulls.create( {
              owner: "${{ github.repository_owner }}",
              repo: "${{ github.event.repository.name }}",
              head: "${{ format( 'update/{0}-changelog', inputs.releaseVersion ) }}",
              base: "${{ inputs.releaseBranch }}",
              title: "${{ format( 'Release: Prepare the changelog for {0}', inputs.releaseVersion ) }}",
              body: "${{ format( 'This pull request was automatically generated during the code freeze to prepare the changelog for {0}', inputs.releaseVersion ) }}"
            } );
            
            return result.data.number;
            
      - name: "Create trunk PR"
        id: trunk-pr
        uses: actions/github-script@v6
        with:
          script: |
            const result = await github.rest.pulls.create( {
              owner: "${{ github.repository_owner }}",
              repo: "${{ github.event.repository.name }}",
              head: "${{ format( 'delete/{0}-changelog', inputs.releaseVersion ) }}",
              base: "trunk",
              title: "${{ format( 'Release: Remove {0} change files', inputs.releaseVersion ) }}",
              body: "${{ format( 'This pull request was automatically generated during the code freeze to remove the changefiles from {0} that are compiled into the `{1}` branch via #{2}', inputs.releaseVersion, inputs.releaseBranch, steps.release-pr.outputs.result ) }}"
            } );
            
            return result.data.number;