name: Playwright Report Comment

on:
  workflow_run:
    workflows: ["CI"]
    types: [completed]

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

jobs:
  comment:
    runs-on: ubuntu-latest
    steps:
      - name: Find PR number for this CI run (works for forks)
        id: pr
        uses: actions/github-script@v7
        with:
          script: |
            const { owner, repo } = context.repo;
            const workflowRun = context.payload.workflow_run;
            const sha = workflowRun.head_sha;
            const headBranch = workflowRun.head_branch;
            const headRepoOwner = workflowRun.head_repository?.owner?.login;

            core.info(`Looking up PR for sha=${sha}, branch=${headBranch}, headRepoOwner=${headRepoOwner}`);

            // Method 1: Try listPullRequestsAssociatedWithCommit (works for same-repo PRs)
            const res = await github.rest.repos.listPullRequestsAssociatedWithCommit({
              owner,
              repo,
              commit_sha: sha,
            });

            let pr = res.data?.[0];

            // Method 2: Fallback for fork PRs - search by head reference
            if (!pr && headRepoOwner && headBranch) {
              core.info(`Trying fallback: searching for PRs with head=${headRepoOwner}:${headBranch}`);
              const pullsRes = await github.rest.pulls.list({
                owner,
                repo,
                state: 'open',
                head: `${headRepoOwner}:${headBranch}`,
              });
              pr = pullsRes.data?.[0];
            }

            if (!pr) {
              core.info("No PR associated with this workflow_run. Likely a push/schedule run.");
              core.setOutput("number", "");
              return;
            }

            core.info(`Found PR #${pr.number}`);
            core.setOutput("number", String(pr.number));

      - name: Stop if no PR found
        if: ${{ steps.pr.outputs.number == '' }}
        run: echo "No PR found for this CI run; skipping."

      - name: Checkout repository (base branch)
        if: ${{ steps.pr.outputs.number != '' }}
        uses: actions/checkout@v4
        with:
          # base_ref is typically the target branch (e.g., main) and is safe to fetch
          ref: ${{ github.event.workflow_run.base_ref }}

      - name: Setup Node.js
        if: ${{ steps.pr.outputs.number != '' }}
        uses: actions/setup-node@v4
        with:
          node-version: lts/*

      - name: Download Playwright HTML report
        if: ${{ steps.pr.outputs.number != '' }}
        uses: actions/download-artifact@v4
        with:
          name: html-report
          path: playwright-report
          github-token: ${{ github.token }}
          repository: ${{ github.event.workflow_run.repository.full_name }}
          run-id: ${{ github.event.workflow_run.id }}

      - name: Download blob reports
        if: ${{ steps.pr.outputs.number != '' }}
        uses: actions/download-artifact@v4
        with:
          path: all-blob-reports
          pattern: blob-report-*
          merge-multiple: true
          github-token: ${{ github.token }}
          repository: ${{ github.event.workflow_run.repository.full_name }}
          run-id: ${{ github.event.workflow_run.id }}

      - name: Generate Playwright summary comment
        if: ${{ steps.pr.outputs.number != '' }}
        uses: actions/github-script@v7
        env:
          PR_NUMBER: ${{ steps.pr.outputs.number }}
          PLAYWRIGHT_RUN_ID: ${{ github.event.workflow_run.id }}
        with:
          script: |
            const { run } = require('./scripts/generate-playwright-summary.js');
            await run({ github, context, core });
