name: PR Preview Deploy

on:
  workflow_run:
    workflows: ["PR Preview Build"]
    types: [completed]

permissions:
  actions: read
  contents: read
  issues: write
  pull-requests: write

concurrency:
  group: pr-preview-deploy-${{ github.event.workflow_run.pull_requests[0].number || github.event.workflow_run.id }}
  cancel-in-progress: true

jobs:
  deploy:
    if: ${{ github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'pull_request' }}
    runs-on: ubuntu-latest
    environment:
      name: PR Preview
      url: ${{ steps.deploy-to-vercel.outputs.PREVIEW_URL }}

    steps:
      - name: Resolve PR Info
        id: pr
        uses: actions/github-script@v7
        with:
          script: |
            const run = context.payload.workflow_run
            const pr = run.pull_requests && run.pull_requests[0]
            if (!pr) {
              core.setFailed("No PR found for this workflow run.")
              return
            }
            core.setOutput("number", pr.number)
            core.setOutput("head_sha", pr.head.sha || run.head_sha)

      - name: Download Prebuilt Artifact
        uses: actions/download-artifact@v4
        with:
          name: vercel-prebuilt
          path: vercel-prebuilt
          github-token: ${{ secrets.GITHUB_TOKEN }}
          repository: ${{ github.repository }}
          run-id: ${{ github.event.workflow_run.id }}

      - name: Extract Prebuilt Output
        run: |
          mkdir -p deploy
          tar -xzf vercel-prebuilt/vercel-prebuilt.tgz -C deploy

      # Install Vercel CLI first to avoid bug with next step
      - name: Install Vercel CLI
        run: npm install -g vercel@22.0.1


      - name: Deploy to Vercel
        id: deploy-to-vercel
        uses: EvanNotFound/vercel-deployment-for-github-actions@v1.2.0
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
          WORKING_DIRECTORY: deploy
          VERCEL_SCOPE: ${{ secrets.VERCEL_SCOPE }}
          PRODUCTION: false
          GITHUB_DEPLOYMENT: false
          PREBUILT: true
          DEPLOY_PR_FROM_FORK: true
          ALIAS_DOMAINS: |
            redefine-preview-pr-${{ steps.pr.outputs.number }}.vercel.app

      - name: Comment Preview URL
        if: ${{ steps.deploy-to-vercel.outputs.PREVIEW_URL != '' }}
        uses: actions/github-script@v7
        with:
          script: |
            const prNumber = Number("${{ steps.pr.outputs.number }}")
            const previewUrl = "${{ steps.deploy-to-vercel.outputs.PREVIEW_URL }}"
            const marker = "<!-- vercel-preview -->"
            const body = `${marker}\nPreview: ${previewUrl}`
            const { owner, repo } = context.repo
            const { data: comments } = await github.rest.issues.listComments({
              owner,
              repo,
              issue_number: prNumber,
            })
            const existing = comments.find((comment) =>
              comment.body && comment.body.includes(marker)
            )
            if (existing) {
              await github.rest.issues.updateComment({
                owner,
                repo,
                comment_id: existing.id,
                body,
              })
            } else {
              await github.rest.issues.createComment({
                owner,
                repo,
                issue_number: prNumber,
                body,
              })
            }