name: Sync Canary After Backport Release

on:
  workflow_run:
    workflows:
      - build-and-deploy
    types:
      - completed
  workflow_dispatch:
    inputs:
      workflowRunId:
        description: Completed build-and-deploy workflow run ID to evaluate
        required: true
        type: string
      headSha:
        description: Release commit SHA from that workflow run
        required: true
        type: string
      dispatch:
        description: Dispatch trigger_release after evaluation
        default: false
        required: false
        type: boolean

concurrency:
  group: sync-backport-canary-release
  cancel-in-progress: true

jobs:
  evaluate:
    if: ${{ github.repository_owner == 'vercel' && (github.event_name == 'workflow_dispatch' || (github.event.workflow_run.event == 'push' && github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.head_branch != 'canary')) }}
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      should_dispatch: ${{ steps.evaluate.outputs.should_dispatch }}
      reason: ${{ steps.evaluate.outputs.reason }}
      current_canary_version: ${{ steps.evaluate.outputs.current_canary_version }}
      released_version: ${{ steps.evaluate.outputs.released_version }}
    steps:
      - name: Check whether head commit is a stable release
        id: precheck
        uses: actions/github-script@v7
        with:
          script: |
            if (context.eventName === 'workflow_dispatch') {
              core.setOutput('should_evaluate', 'true')
              return
            }

            const headCommitMessage =
              context.payload.workflow_run.head_commit?.message?.trim() || ''
            const stableReleaseCommitRegex = /^v\d+\.\d+\.\d+$/

            if (stableReleaseCommitRegex.test(headCommitMessage)) {
              core.setOutput('should_evaluate', 'true')
              return
            }

            core.setOutput('should_evaluate', 'false')
            core.setOutput('should_dispatch', 'false')
            core.setOutput('reason', 'Head commit is not a stable release commit')

      - uses: actions/checkout@v6
        if: steps.precheck.outputs.should_evaluate == 'true'
        with:
          ref: ${{ github.event_name == 'workflow_dispatch' && github.ref_name || 'canary' }}
          fetch-depth: 1

      - name: Setup node
        if: steps.precheck.outputs.should_evaluate == 'true'
        uses: actions/setup-node@v6
        with:
          node-version: 20
          check-latest: true

      - name: Setup corepack
        if: steps.precheck.outputs.should_evaluate == 'true'
        run: |
          npm i -g corepack@0.31
          corepack enable

      - name: Install dependencies
        if: steps.precheck.outputs.should_evaluate == 'true'
        run: pnpm install --frozen-lockfile --ignore-scripts

      - name: Create GitHub App token
        id: release-app-token
        if: steps.precheck.outputs.should_evaluate == 'true'
        uses: actions/create-github-app-token@v3
        with:
          client-id: ${{ vars.RELEASE_GITHUB_APP_CLIENT_ID }}
          private-key: ${{ secrets.RELEASE_GITHUB_APP_PRIVATE_KEY }}
          owner: ${{ github.repository_owner }}
          repositories: next.js
          permission-actions: read
          permission-contents: read

      - name: Evaluate backport release
        id: evaluate
        if: steps.precheck.outputs.should_evaluate == 'true'
        env:
          RELEASE_GITHUB_TOKEN: ${{ steps.release-app-token.outputs.token }}
          WORKFLOW_RUN_ID: ${{ github.event_name == 'workflow_dispatch' && inputs.workflowRunId || github.event.workflow_run.id }}
          HEAD_SHA: ${{ github.event_name == 'workflow_dispatch' && inputs.headSha || github.event.workflow_run.head_sha }}
          HEAD_COMMIT_MESSAGE: ${{ github.event_name == 'workflow_dispatch' && '' || github.event.workflow_run.head_commit.message }}
        run: node ./scripts/check-backport-canary-release.js --workflow-run-id "$WORKFLOW_RUN_ID" --head-sha "$HEAD_SHA"

      - name: Print evaluation
        run: |
          echo "should_dispatch=${{ steps.evaluate.outputs.should_dispatch || steps.precheck.outputs.should_dispatch }}"
          echo "reason=${{ steps.evaluate.outputs.reason || steps.precheck.outputs.reason }}"
          echo "released_version=${{ steps.evaluate.outputs.released_version }}"
          echo "current_canary_version=${{ steps.evaluate.outputs.current_canary_version }}"
          echo "dispatch_input=${{ github.event_name == 'workflow_dispatch' && inputs.dispatch || false }}"
          echo "auto_dispatch_enabled=${{ vars.ENABLE_BACKPORT_CANARY_SYNC || 'false' }}"

  dispatch:
    needs: evaluate
    if: ${{ needs.evaluate.outputs.should_dispatch == 'true' && ((github.event_name == 'workflow_dispatch' && inputs.dispatch) || (github.event_name == 'workflow_run' && vars.ENABLE_BACKPORT_CANARY_SYNC == 'true')) }}
    runs-on: ubuntu-latest
    steps:
      - name: Create GitHub App token
        id: release-app-token
        uses: actions/create-github-app-token@v3
        with:
          client-id: ${{ vars.RELEASE_GITHUB_APP_CLIENT_ID }}
          private-key: ${{ secrets.RELEASE_GITHUB_APP_PRIVATE_KEY }}
          owner: ${{ github.repository_owner }}
          repositories: next.js
          permission-actions: write

      - uses: actions/github-script@v7
        with:
          github-token: ${{ steps.release-app-token.outputs.token }}
          script: |
            await github.request(
              "POST /repos/{owner}/{repo}/actions/workflows/{workflow_id}/dispatches",
              {
                owner: context.repo.owner,
                repo: context.repo.repo,
                workflow_id: "trigger_release.yml",
                ref: "canary",
                inputs: {
                  releaseType: "canary",
                  semverType: "minor",
                  force: "true",
                },
              }
            )

            console.info(
              `Triggered canary release after backport ${process.env.RELEASED_VERSION}; current canary was ${process.env.CURRENT_CANARY_VERSION}`
            )
        env:
          RELEASED_VERSION: ${{ needs.evaluate.outputs.released_version }}
          CURRENT_CANARY_VERSION: ${{ needs.evaluate.outputs.current_canary_version }}