name: Cherry Pick Tool
on:
  issues:
    types: [milestoned, labeled]
  pull_request:
    types: [closed]
  workflow_dispatch:
    inputs:
      release_branch:
        description: Provide the release branch you want to cherry pick into. Example release/6.9
        default: ''
        required: true
      pull_requests:
        description: The pull request number.
        default: ''
        required: true
      skipSlackPing:
        description: "Skip Slack Ping: If true, the Slack ping will be skipped (useful for testing)"
        type: boolean
        required: false
        default: false
      slackChannelOverride:
        description: "Slack Channel Override: The channel ID to send the Slack ping about the code freeze violation"
        required: false
        default: ''

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:
  verify:
    name: Verify
    runs-on: ubuntu-20.04
    outputs:
      run: ${{ steps.check.outputs.run }}
    steps:
      - name: check
        id: check
        uses: actions/github-script@v6
        with:
          script: |
            let run = false;

            const isManualTrigger = context.payload.inputs && context.payload.inputs.release_branch && context.payload.inputs.release_branch != null;
 
            const isMergedMilestonedIssue = context.payload.issue && context.payload.issue.pull_request != null && context.payload.issue.pull_request.merged_at != null && context.payload.issue.milestone != null;
 
            const isMergedMilestonedPR = context.payload.pull_request && context.payload.pull_request != null && context.payload.pull_request.merged == true && context.payload.pull_request.milestone != null;

            const isBot = context.payload.pull_request && ( context.payload.pull_request.user.login == 'github-actions[bot]' || context.payload.pull_request.user.type == 'Bot' );

            if ( !isBot && ( isManualTrigger || isMergedMilestonedIssue || isMergedMilestonedPR ) ) {
              console.log( "::set-output name=run::true" );
            } else {
              console.log( "::set-output name=run::false" );
            } 
  prep:
    name: Prep inputs
    runs-on: ubuntu-20.04
    needs: verify
    if: needs.verify.outputs.run == 'true'
    outputs:
      release: ${{ steps.prep-inputs.outputs.release }}
      pr: ${{ steps.prep-inputs.outputs.pr }}
      version: ${{ steps.prep-inputs.outputs.version }}
    steps:
      - name: Prep inputs
        id: prep-inputs
        uses: actions/github-script@v6
        with:
          script: |
            const event = ${{ toJSON( github.event ) }}

            // Means this workflow was triggered manually.
            if ( event.inputs && event.inputs.release_branch ) {
              const releaseBranch = '${{ inputs.release_branch }}'
              const version = releaseBranch.replace( 'release/', '' );

              console.log( "::set-output name=version::" + version )
              console.log( "::set-output name=release::${{ inputs.release_branch }}" )
            } else {
              const version = '${{ github.event.pull_request.milestone.title }}'

              console.log( "::set-output name=version::" + version )
              console.log( "::set-output name=release::release/${{ github.event.pull_request.milestone.title }}" )
            }

            // Means this workflow was triggered manually.
            if ( event.inputs && event.inputs.pull_requests ) {
              console.log( "::set-output name=pr::${{ inputs.pull_requests }}" )
            } else {
              console.log( "::set-output name=pr::${{ github.event.pull_request.number }}" )
            }
  check-release-branch-exists:
    name: Check for existence of release branch
    runs-on: ubuntu-20.04
    needs: prep
    steps:
      - name: Check for release branch
        id: release-breanch-check
        uses: actions/github-script@v6
        with:
          script: |
            // This will throw an error for non-200 responses, which prevents subsequent jobs from completing, as desired.
            await github.request( 'GET /repos/{owner}/{repo}/branches/{branch}', {
              owner: context.repo.owner,
              repo: context.repo.repo,
              branch: '${{ needs.prep.outputs.release }}',
            } );
  cherry-pick-run:
    name: Run cherry pick tool
    runs-on: ubuntu-20.04
    needs: [ prep, check-release-branch-exists ]
    if: success()
    steps:
      - name: Checkout release branch
        uses: actions/checkout@v3
        with:
          fetch-depth: 100

      - name: Git fetch the release branch
        run: git fetch origin ${{ needs.prep.outputs.release }}

      - name: Checkout release branch
        run: git checkout ${{ needs.prep.outputs.release }}

      - name: Create a cherry pick branch based on release branch
        run: git checkout -b cherry-pick-${{ needs.prep.outputs.version }}/${{ needs.prep.outputs.pr }}

      - name: Get commit sha from PR
        id: commit-sha
        uses: actions/github-script@v6
        with:
          script: |
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: '${{ needs.prep.outputs.pr }}'
            })

            console.log( `::set-output name=sha::${ pr.data.merge_commit_sha }` )

      - name: Cherry pick
        run: |
          git cherry-pick ${{ steps.commit-sha.outputs.sha }}

      - name: Generate changelog
        id: changelog
        uses: actions/github-script@v6
        with:
          script: |
            const fs = require( 'node:fs' );

            const changelogsToBeDeleted = []
            let changelogTxt = '';

            const commit = await github.rest.repos.getCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: '${{ steps.commit-sha.outputs.sha }}'
            })

            for ( const file of commit.data.files ) {
              if ( file.filename.match( 'plugins/woocommerce/changelog/' ) ) {
                if ( changelogsToBeDeleted.indexOf( file.filename ) === -1 ) {
                  changelogsToBeDeleted.push( file.filename );
                }

                let changelogEntry     = '';
                let changelogEntryType = '';

                fs.readFile( './' + file.filename, 'utf-8', function( err, data ) {
                  if ( err ) {
                    console.error( err );
                  }

                  const changelogEntryArr  = data.split( "\n" );
                  changelogEntryType = data.match( /Type: (.+)/i );
                  changelogEntryType = changelogEntryType[ 1 ].charAt( 0 ).toUpperCase() + changelogEntryType[ 1 ].slice( 1 );

                  changelogEntry = changelogEntryArr.filter( el => {
                    return el !== null && typeof el !== 'undefined' && el !== '';
                  } );
                  changelogEntry = changelogEntry[ changelogEntry.length - 1 ];

                  // Check if changelogEntry is what we want.
                  if ( changelogEntry.length < 1 ) {
                    changelogEntry = false;
                  }

                  if ( changelogEntry.match( /significance:/i ) ) {
                    changelogEntry = false;
                  }

                  if ( changelogEntry.match( /type:/i ) ) {
                    changelogEntry = false;
                  }

                  if ( changelogEntry.match( /comment:/i ) ) {
                    changelogEntry = false;
                  }
                } );

                if ( changelogEntry === false ) {
                  continue;
                }

                fs.readFile( './plugins/woocommerce/readme.txt', 'utf-8', function( err, data ) {
                  if ( err ) {
                    console.error( err );
                  }

                  changelogTxt = data.split( "\n" );
                  let isInRange = false;
                  let newChangelogTxt = [];

                  for ( const line of changelogTxt ) {
                    if ( isInRange === false && line === '== Changelog ==' ) {
                      isInRange = true;
                    }

                    if ( isInRange === true && line.match( /\*\*WooCommerce Blocks/ ) ) {
                      isInRange = false;
                    }

                    // Find the first match of the entry "Type".
                    if ( isInRange && line.match( `\\* ${changelogEntryType} -` ) ) {
                      newChangelogTxt.push( '* ' + changelogEntryType + ' - ' + changelogEntry + ` [#${{ needs.prep.outputs.pr }}](https://github.com/woocommerce/woocommerce/pull/${{ needs.prep.outputs.pr }})` );
                      newChangelogTxt.push( line );
                      isInRange = false;
                      continue;
                    }

                    newChangelogTxt.push( line );
                  }

                  fs.writeFile( './plugins/woocommerce/readme.txt', newChangelogTxt.join( "\n" ), err => {
                    if ( err ) {
                      console.error( `Unable to generate the changelog entry for PR ${{ needs.prep.outputs.pr }}` );
                    }
                  } );
                } );
              }
            }

            console.log( `::set-output name=changelogsToBeDeleted::${ changelogsToBeDeleted }` )

      - name: Delete changelog files from cherry pick branch
        run: git rm ${{ steps.changelog.outputs.changelogsToBeDeleted }}

      - name: Commit changes for cherry pick
        run: git commit --no-verify -am "Prep for cherry pick ${{ needs.prep.outputs.pr }}"

      - name: Push cherry pick branch up
        run: git push origin cherry-pick-${{ needs.prep.outputs.version }}/${{ needs.prep.outputs.pr }}

      - name: Create the PR for cherry pick branch
        id: cherry-pick-pr
        uses: actions/github-script@v6
        with:
          script: |
            let cherryPickPRBody = "This PR cherry-picks the following PRs into the release branch:\n";

            cherryPickPRBody = `${cherryPickPRBody}` + `* #${{ needs.prep.outputs.pr }}` + "\n";

            const pr = await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: "Cherry pick ${{ needs.prep.outputs.pr }} into ${{ needs.prep.outputs.release }}",
              head: "cherry-pick-${{ needs.prep.outputs.version }}/${{ needs.prep.outputs.pr }}",
              base: "${{ needs.prep.outputs.release }}",
              body: cherryPickPRBody
            })

            console.log( `::set-output name=cherry-pick-pr::${ pr.data.html_url }` )
      - name: Checkout trunk branch
        run: git checkout trunk

      - name: Create a branch based on trunk branch
        run: git checkout -b delete-changelogs/${{ needs.prep.outputs.pr }}

      - name: Delete changelogs from trunk
        run: git rm ${{ steps.changelog.outputs.changelogsToBeDeleted }}

      - name: Commit changes for deletion
        run: git commit --no-verify -am "Delete changelog files for ${{ needs.prep.outputs.pr }}"

      - name: Push deletion branch up
        run: git push origin delete-changelogs/${{ needs.prep.outputs.pr }}

      - name: Create the PR for deletion branch
        id: deletion-pr
        uses: actions/github-script@v6
        with:
          script: |
            const pr = await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: "Delete changelog files based on PR ${{ needs.prep.outputs.pr }}",
              head: "delete-changelogs/${{ needs.prep.outputs.pr }}",
              base: "trunk",
              body: "Delete changelog files based on PR #${{ needs.prep.outputs.pr }}"
            })

            console.log( `::set-output name=deletion-pr::${ pr.data.html_url }` )

      - name: Notify Slack on failure
        if: ${{ failure() && inputs.skipSlackPing != true }}
        uses: archive/github-actions-slack@v2.0.0
        with:
          slack-bot-user-oauth-access-token: ${{ secrets.CODE_FREEZE_BOT_TOKEN }}
          slack-channel: ${{ inputs.slackChannelOverride || secrets.WOO_RELEASE_SLACK_CHANNEL }}
          slack-text: |
            :warning-8c: Code freeze violation. PR(s) created that breaks the Code Freeze for '${{ needs.prep.outputs.release }}' :ice_cube:

            An attempt to cherry pick PR(s) into outgoing release '${{ needs.prep.outputs.release }}' has failed. This could be due to a merge conflict or something else that requires manual attention. Please check: https://github.com/woocommerce/woocommerce/pull/${{ needs.prep.outputs.pr }}

      - name: Notify Slack on success
        if: ${{ success() && inputs.skipSlackPing != true }}
        uses: archive/github-actions-slack@v2.0.0
        with:
          slack-bot-user-oauth-access-token: ${{ secrets.CODE_FREEZE_BOT_TOKEN }}
          slack-channel: ${{ inputs.slackChannelOverride || secrets.WOO_RELEASE_SLACK_CHANNEL }}
          slack-text: |
            :warning-8c: Code freeze violation. PR(s) created that breaks the Code Freeze for '${{ needs.prep.outputs.release }}' :ice_cube:
            
            Release lead please review:

            ${{ steps.cherry-pick-pr.outputs.cherry-pick-pr }}
            ${{ steps.deletion-pr.outputs.deletion-pr }}