name: Deploy preview

on:
  workflow_run:
    workflows: [Preview]
    types: [completed]

concurrency:
  group: deploy-preview-${{ 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.head_repository.full_name == github.repository &&
      github.event.workflow_run.pull_requests[0].number != null
    runs-on: ubuntu-latest
    permissions:
      actions: read
      contents: read
      deployments: write
      pull-requests: write
    environment:
      name: preview
      url: ${{ steps.deploy.outputs.deployment-url }}
    steps:
      - name: Download validated preview artifact
        uses: actions/download-artifact@v8
        with:
          name: preview-dist
          path: dist
          github-token: ${{ github.token }}
          repository: ${{ github.repository }}
          run-id: ${{ github.event.workflow_run.id }}

      - name: Deploy preview
        uses: cloudflare/wrangler-action@v4
        id: deploy
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          packageManager: npm
          command: pages deploy dist --project-name=openpencil-app --branch=pr-${{ github.event.workflow_run.pull_requests[0].number }}

      - name: Comment preview URL
        uses: actions/github-script@v9
        env:
          PREVIEW_URL: ${{ steps.deploy.outputs.deployment-url }}
          PR_NUMBER: ${{ github.event.workflow_run.pull_requests[0].number }}
        with:
          script: |
            const url = process.env.PREVIEW_URL;
            const issue_number = Number(process.env.PR_NUMBER);
            if (!url || !Number.isInteger(issue_number)) {
              core.setFailed('Preview deployment metadata is incomplete');
              return;
            }
            const marker = '<!-- preview-deploy -->';
            const body = `${marker}\n🔗 Preview: ${url}`;
            const { data: comments } = await github.rest.issues.listComments({
              ...context.repo, issue_number
            });
            const existing = comments.find(comment => comment.body?.includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                ...context.repo, comment_id: existing.id, body
              });
            } else {
              await github.rest.issues.createComment({
                ...context.repo, issue_number, body
              });
            }