name: CI

on:
  push:
    branches: [main]
    paths-ignore: ['**.md', 'docs/**', 'LICENSE']
  pull_request:
    branches: [main]
    paths-ignore: ['**.md', 'docs/**', 'LICENSE']
  workflow_call:

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

# ── Reusable workflow orchestration ─────────────────────────────────
# Each concern lives in its own workflow file for maintainability:
#   ci-quality.yml       — typecheck (tsc --noEmit)
#   ci-tests.yml         — all tests with coverage (ubuntu) + cross-platform
#
# The PR report runs inline (not via workflow_run) so it uses the
# PR branch's code instead of main's — avoids stale report templates.

jobs:
  quality:
    uses: ./.github/workflows/ci-quality.yml
    permissions:
      contents: read

  tests:
    uses: ./.github/workflows/ci-tests.yml
    permissions:
      contents: read

  # ── Unified CI gate ──────────────────────────────────────────────
  # Single required check for branch protection.
  ci-status:
    name: CI Gate
    needs: [quality, tests]
    if: always()
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - name: Check all jobs passed
        shell: bash
        env:
          QUALITY: ${{ needs.quality.result }}
          TESTS: ${{ needs.tests.result }}
        run: |
          echo "Quality:  $QUALITY"
          echo "Tests:    $TESTS"
          if [[ "$QUALITY" != "success" ]] ||
             [[ "$TESTS" != "success" ]]; then
            echo "::error::One or more CI jobs failed"
            exit 1
          fi

  # ── PR Report ────────────────────────────────────────────────────
  # Posts a sticky comment with test results, coverage, and
  # per-platform status.  Runs inline so it uses the PR branch's
  # report template (not main's stale version via workflow_run).
  pr-report:
    name: PR Report
    if: always() && github.event_name == 'pull_request'
    needs: [quality, tests]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      actions: read
      pull-requests: write
    timeout-minutes: 5
    steps:
      - name: Download test reports
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
        with:
          name: test-reports
          path: ${{ runner.temp }}/test-reports
        continue-on-error: true

      - name: Fetch cross-platform job results
        id: jobs
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
        with:
          script: |
            const jobs = await github.rest.actions.listJobsForWorkflowRun({
              owner: context.repo.owner,
              repo: context.repo.repo,
              run_id: context.runId,
              per_page: 50,
            });

            const results = {};
            for (const job of jobs.data.jobs) {
              if (job.name.includes('ubuntu')) results.ubuntu = job.conclusion || 'pending';
              else if (job.name.includes('windows')) results.windows = job.conclusion || 'pending';
              else if (job.name.includes('macos')) results.macos = job.conclusion || 'pending';
            }
            core.setOutput('ubuntu', results.ubuntu || 'unknown');
            core.setOutput('windows', results.windows || 'unknown');
            core.setOutput('macos', results.macos || 'unknown');

      - name: Fetch base branch coverage
        id: base-coverage
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
        with:
          script: |
            const fs = require('fs');
            const path = require('path');

            const runs = await github.rest.actions.listWorkflowRuns({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: 'ci.yml',
              branch: 'main',
              status: 'success',
              per_page: 1,
            });

            if (runs.data.workflow_runs.length === 0) {
              core.setOutput('found', 'false');
              return;
            }

            const mainRunId = runs.data.workflow_runs[0].id;
            const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
              owner: context.repo.owner,
              repo: context.repo.repo,
              run_id: mainRunId,
            });

            const testReports = artifacts.data.artifacts.find(a => a.name === 'test-reports');
            if (!testReports) {
              core.setOutput('found', 'false');
              return;
            }

            const zip = await github.rest.actions.downloadArtifact({
              owner: context.repo.owner,
              repo: context.repo.repo,
              artifact_id: testReports.id,
              archive_format: 'zip',
            });

            const dest = path.join(process.env.RUNNER_TEMP, 'base-coverage');
            fs.mkdirSync(dest, { recursive: true });
            fs.writeFileSync(path.join(dest, 'base.zip'), Buffer.from(zip.data));
            core.setOutput('found', 'true');
            core.setOutput('dir', dest);

      - name: Extract base coverage
        if: steps.base-coverage.outputs.found == 'true'
        shell: bash
        run: |
          cd "${{ steps.base-coverage.outputs.dir }}"
          unzip -o base.zip -d base

      - name: Build and post report
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
        env:
          QUALITY: ${{ needs.quality.result }}
          TESTS: ${{ needs.tests.result }}
          UBUNTU: ${{ steps.jobs.outputs.ubuntu }}
          WINDOWS: ${{ steps.jobs.outputs.windows }}
          MACOS: ${{ steps.jobs.outputs.macos }}
          BASE_FOUND: ${{ steps.base-coverage.outputs.found }}
          BASE_DIR: ${{ steps.base-coverage.outputs.dir }}
        with:
          script: |
            const fs = require('fs');
            const path = require('path');

            const icon = (s) => ({ success: '✅', failure: '❌', cancelled: '⏭️' }[s] || '❓');
            const temp = process.env.RUNNER_TEMP;

            // ── Read coverage ──
            function readCov(dir) {
              const out = { stmts: 'N/A', branch: 'N/A', funcs: 'N/A', lines: 'N/A',
                            stmtsCov: '', branchCov: '', funcsCov: '', linesCov: '' };
              try {
                const files = require('child_process')
                  .execSync(`find "${dir}" -name coverage-summary.json -type f`, { encoding: 'utf8' })
                  .trim().split('\n').filter(Boolean);
                if (!files.length) return out;
                const d = JSON.parse(fs.readFileSync(files[0], 'utf8')).total;
                out.stmts = d.statements.pct; out.branch = d.branches.pct;
                out.funcs = d.functions.pct;  out.lines = d.lines.pct;
                out.stmtsCov = `${d.statements.covered}/${d.statements.total}`;
                out.branchCov = `${d.branches.covered}/${d.branches.total}`;
                out.funcsCov = `${d.functions.covered}/${d.functions.total}`;
                out.linesCov = `${d.lines.covered}/${d.lines.total}`;
              } catch {}
              return out;
            }

            const cov = readCov(path.join(temp, 'test-reports'));
            const base = process.env.BASE_FOUND === 'true'
              ? readCov(path.join(process.env.BASE_DIR, 'base'))
              : { stmts: 'N/A', branch: 'N/A', funcs: 'N/A', lines: 'N/A' };

            // ── Read test results ──
            let total = 0, passed = 0, failed = 0, skipped = 0, suites = 0, duration = '0s';
            let skippedTests = [];
            try {
              const files = require('child_process')
                .execSync(`find "${path.join(temp, 'test-reports')}" -name test-results.json -type f`, { encoding: 'utf8' })
                .trim().split('\n').filter(Boolean);
              if (files.length) {
                const r = JSON.parse(fs.readFileSync(files[0], 'utf8'));
                total = r.numTotalTests || 0;
                passed = r.numPassedTests || 0;
                failed = r.numFailedTests || 0;
                skipped = r.numPendingTests || 0;
                suites = r.numTotalTestSuites || 0;
                const durS = Math.floor((Math.max(...r.testResults.map(t => t.endTime)) - r.startTime) / 1000);
                duration = durS >= 60 ? `${Math.floor(durS / 60)}m ${durS % 60}s` : `${durS}s`;
                // Collect skipped test names
                for (const suite of r.testResults) {
                  for (const t of (suite.assertionResults || [])) {
                    if (t.status === 'pending' || t.status === 'skipped') {
                      skippedTests.push(`- ${t.ancestorTitles.join(' > ')} > ${t.title}`);
                    }
                  }
                }
              }
            } catch {}

            // ── Coverage delta ──
            function delta(pct, basePct) {
              if (pct === 'N/A' || basePct === 'N/A') return '—';
              const d = (pct - basePct).toFixed(1);
              if (d > 0) return `📈 +${d}%`;
              if (d < 0) return `📉 ${d}%`;
              return '＝';
            }

            // ── Build markdown ──
            const { QUALITY, TESTS, UBUNTU, WINDOWS, MACOS } = process.env;
            const overall = (QUALITY === 'success' && TESTS === 'success')
              ? '✅ **All checks passed**' : '❌ **Some checks failed**';
            const sha = context.sha.slice(0, 7);

            let body = `## CI Report\n\n${overall} &ensp; \`${sha}\`\n\n`;

            body += `### Pipeline\n\n`;
            body += `| Stage | Status | Ubuntu | Windows | macOS |\n`;
            body += `|-------|--------|--------|---------|-------|\n`;
            body += `| Typecheck | ${icon(QUALITY)} \`${QUALITY}\` | — | — | — |\n`;
            body += `| Tests | ${icon(TESTS)} \`${TESTS}\` | ${icon(UBUNTU)} | ${icon(WINDOWS)} | ${icon(MACOS)} |\n\n`;

            if (total > 0) {
              body += `### Tests\n\n`;
              body += `| Metric | Value |\n|--------|-------|\n`;
              body += `| Total | **${total}** |\n`;
              body += `| Passed | **${passed}** |\n`;
              if (failed > 0) body += `| Failed | **${failed}** |\n`;
              if (skipped > 0) body += `| Skipped | ${skipped} |\n`;
              body += `| Files | ${suites} |\n`;
              body += `| Duration | ${duration} |\n\n`;

              if (failed === 0) {
                body += `✅ All **${passed}** tests passed across **${suites}** files\n`;
              } else {
                body += `❌ **${failed}** failed / **${passed}** passed\n`;
              }

              if (skippedTests.length > 0) {
                body += `\n<details>\n<summary>${skipped} test(s) skipped</summary>\n\n`;
                body += skippedTests.join('\n') + '\n\n</details>\n';
              }
              body += '\n';
            }

            if (cov.stmts !== 'N/A') {
              body += `### Coverage\n\n`;
              body += `| Metric | Coverage | Covered | Base (main) | Delta |\n`;
              body += `|--------|----------|---------|-------------|-------|\n`;
              body += `| Statements | **${cov.stmts}%** | ${cov.stmtsCov} | ${base.stmts}% | ${delta(cov.stmts, base.stmts)} |\n`;
              body += `| Branches | **${cov.branch}%** | ${cov.branchCov} | ${base.branch}% | ${delta(cov.branch, base.branch)} |\n`;
              body += `| Functions | **${cov.funcs}%** | ${cov.funcsCov} | ${base.funcs}% | ${delta(cov.funcs, base.funcs)} |\n`;
              body += `| Lines | **${cov.lines}%** | ${cov.linesCov} | ${base.lines}% | ${delta(cov.lines, base.lines)} |\n\n`;
            } else {
              body += `### Coverage\n\n⚠️ Coverage data unavailable — check the [test job](${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}) for details.\n\n`;
            }

            const runUrl = `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`;
            body += `---\n<sub>📋 [Full run](${runUrl}) · Coverage from Ubuntu · Generated by CI</sub>`;

            // ── Post sticky comment ──
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              per_page: 100,
            });

            const marker = '<!-- ci-report -->';
            const existing = comments.find(c => c.body?.includes(marker));
            const fullBody = marker + '\n' + body;

            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body: fullBody,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: fullBody,
              });
            }