ci.yml

name: CI

on:
  push:
    branches: [master, main]
  pull_request:

jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-latest
            platform: linux
          - os: macos-latest
            platform: macos
          - os: windows-latest
            platform: windows
    runs-on: ${{ matrix.os }}
    name: test (${{ matrix.platform }})
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod

      - name: Run tests with race detector and coverage
        run: go test -v -short -race -coverprofile=coverage.out -covermode=atomic -count=1 ./...

      - name: Print coverage summary
        if: success()
        run: go tool cover -func=coverage.out

      - name: Vet
        run: go vet ./...

      - name: Upload coverage
        if: success()
        uses: actions/upload-artifact@v4
        with:
          name: coverage-${{ matrix.platform }}
          path: coverage.out

      - name: Report job status
        if: always()
        shell: bash
        run: echo "${{ job.status }}" > status.txt

      - name: Upload status
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: status-${{ matrix.platform }}
          path: status.txt

  update-badges:
    needs: test
    if: always() && github.event_name == 'push' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/main')
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod

      - uses: actions/download-artifact@v4
        with:
          path: artifacts

      - name: Update badges
        shell: python3 {0}
        run: |
          import os, re, subprocess

          def read_file(path):
              try:
                  return open(path).read().strip()
              except FileNotFoundError:
                  return None

          def coverage_pct(path):
              if not os.path.exists(path):
                  return None
              result = subprocess.run(
                  ["go", "tool", "cover", "-func=" + path],
                  capture_output=True, text=True,
              )
              for line in result.stdout.splitlines():
                  if line.startswith("total:"):
                      return line.split()[-1].replace("%", "")
              return None

          def badge_color(pct):
              try:
                  v = float(pct)
              except (TypeError, ValueError):
                  return "grey"
              if v >= 80: return "brightgreen"
              if v >= 60: return "yellow"
              if v >= 40: return "orange"
              return "red"

          def build_badge_url(label, value, color):
              value = value.replace("-", "--").replace(" ", "_")
              return f"https://img.shields.io/badge/{label}-{value}-{color}"

          platforms = ["linux", "macos", "windows"]
          readme = open("README.md").read()

          # Map matrix platform names to badge label prefixes
          badge_labels = {
              "linux": "linux",
              "macos": "macOS",
              "windows": "windows",
          }

          for p in platforms:
              label = badge_labels[p]

              # --- Tests badge ---
              status = read_file(f"artifacts/status-{p}/status.txt")
              if status == "success":
                  test_val, test_color = "passing", "brightgreen"
              elif status == "failure":
                  test_val, test_color = "failing", "red"
              elif status == "cancelled":
                  test_val, test_color = "cancelled", "grey"
              else:
                  test_val, test_color = "unknown", "grey"

              test_url = build_badge_url(f"{label}_tests", test_val, test_color)
              readme = re.sub(
                  rf'!\[{p}: tests\]\([^)]*\)',
                  f'![{p}: tests]({test_url})',
                  readme,
              )

              # --- Coverage badge ---
              cov = coverage_pct(f"artifacts/coverage-{p}/coverage.out")
              if cov:
                  cov_val = cov + "%25"  # URL-encode the %
                  cov_color = badge_color(cov)
              else:
                  cov_val, cov_color = "unknown", "grey"

              cov_url = build_badge_url(f"{label}_coverage", cov_val, cov_color)
              readme = re.sub(
                  rf'!\[{p}: coverage\]\([^)]*\)',
                  f'![{p}: coverage]({cov_url})',
                  readme,
              )

          open("README.md", "w").write(readme)
          print("Badges updated")

      - name: Commit updated badges
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add README.md
          git diff --cached --quiet && echo "No changes to commit" && exit 0
          git commit -m "docs: update CI badges [skip ci]"
          git push