name: Deploy PR Preview

on:
  pull_request:
    types: [opened, synchronize, reopened, labeled, unlabeled]
    paths-ignore:
      - 'charts/**'
      - 'docs/**'
      - '*.md'

jobs:
  deploy-preview:
    if: contains(github.event.pull_request.labels.*.name, 'preview-cf')
    name: Deploy to Cloudflare Containers
    runs-on: ubuntu-latest
    timeout-minutes: 15
    permissions:
      actions: read
      contents: read
      pull-requests: write
      deployments: write

    steps:
      - name: Wait for PR CI to pass
        uses: actions/github-script@v7
        with:
          script: |
            const headSha = context.payload.pull_request.head.sha;
            const timeoutMs = 10 * 60 * 1000;
            const pollMs = 15 * 1000;
            const startedAt = Date.now();
            let lastState = 'not found';

            const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

            while (Date.now() - startedAt < timeoutMs) {
              const { data } = await github.rest.actions.listWorkflowRunsForRepo({
                owner: context.repo.owner,
                repo: context.repo.repo,
                event: 'pull_request',
                head_sha: headSha,
                per_page: 20,
              });

              const prRun = data.workflow_runs.find((run) => run.name === 'Pull Request' && run.head_sha === headSha);

              if (prRun) {
                lastState = `${prRun.status}/${prRun.conclusion ?? 'pending'}`;
                core.info(`Pull Request workflow ${prRun.id}: ${lastState}`);

                if (prRun.status === 'completed') {
                  if (prRun.conclusion === 'success') {
                    return;
                  }

                  core.setFailed(`Pull Request workflow concluded with ${prRun.conclusion}`);
                  return;
                }
              }

              await sleep(pollMs);
            }

            core.setFailed(`Timed out waiting for Pull Request workflow for ${headSha}. Last state: ${lastState}`);

      - name: Checkout code
        uses: actions/checkout@v5

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "24"

      - name: Install Wrangler dependencies
        working-directory: workers/preview
        run: npm install

      - name: Configure preview files for this PR
        working-directory: workers/preview
        run: |
          sed -i "s/\${PR_NUMBER}/${{ github.event.pull_request.number }}/g" wrangler.toml
          sed -i "s/\${PR_NUMBER}/${{ github.event.pull_request.number }}/g" src/index.ts
          cat wrangler.toml

      - name: Create GitHub Deployment
        id: deployment
        uses: actions/github-script@v7
        with:
          script: |
            const deployment = await github.rest.repos.createDeployment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: context.payload.pull_request.head.sha,
              environment: `preview-pr-${{ github.event.pull_request.number }}`,
              auto_merge: false,
              required_contexts: [],
              description: 'PR Preview Deployment'
            });
            return deployment.data.id;
          result-encoding: string

      - name: Deploy to Cloudflare Containers
        id: deploy
        working-directory: workers/preview
        env:
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
        run: |
          npx wrangler deploy --var "PR_NUMBER:${{ github.event.pull_request.number }}"

          # Get the deployment URL
          PREVIEW_URL="https://sure-preview-${{ github.event.pull_request.number }}.${{ secrets.CLOUDFLARE_WORKERS_SUBDOMAIN }}.workers.dev"
          echo "preview_url=${PREVIEW_URL}" >> "$GITHUB_OUTPUT"

      - name: Warm preview container
        env:
          PREVIEW_URL: ${{ steps.deploy.outputs.preview_url }}
        run: |
          echo "Triggering preview wake-up..."
          curl -fsS "$PREVIEW_URL/" >/dev/null || true

      - name: Update Deployment Status
        if: always() && steps.deployment.outputs.result
        uses: actions/github-script@v7
        with:
          script: |
            const state = '${{ job.status }}' === 'success' ? 'success' : 'failure';
            await github.rest.repos.createDeploymentStatus({
              owner: context.repo.owner,
              repo: context.repo.repo,
              deployment_id: ${{ steps.deployment.outputs.result }},
              state: state,
              environment_url: state === 'success' ? '${{ steps.deploy.outputs.preview_url }}' : undefined,
              description: state === 'success' ? 'Preview deployed successfully' : 'Preview deployment failed'
            });

      - name: Comment on PR
        if: success()
        uses: actions/github-script@v7
        with:
          script: |
            const previewUrl = '${{ steps.deploy.outputs.preview_url }}';
            const commentBody = `## 🚀 Preview Deployment Ready

            Your preview environment has been deployed to Cloudflare Containers with the PR's Docker image.

            **Preview URL:** ${previewUrl}

            > ⏰ This preview is intended to be cleaned up after **24 hours** of the last deployment once the cleanup workflow is live on the default branch.
            > 💤 The container will sleep after 30 minutes of inactivity and wake on the next request.

            ---
            <sub>Deployed from commit ${{ github.event.pull_request.head.sha }}</sub>`;

            // Find existing comment
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: ${{ github.event.pull_request.number }}
            });

            const botComment = comments.find(comment =>
              comment.user.type === 'Bot' &&
              comment.body.includes('Preview Deployment Ready')
            );

            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: commentBody
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: ${{ github.event.pull_request.number }},
                body: commentBody
              });
            }
      - name: Store cleanup metadata
        if: success()
        uses: actions/upload-artifact@v6
        with:
          name: preview-cleanup-pr-${{ github.event.pull_request.number }}
          path: |
            workers/preview/wrangler.toml
          retention-days: 2