name: Test

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

jobs:
  lint-and-unit:
    name: Lint & Unit Tests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Run lint
        run: npm run check

      - name: Run unit tests
        run: npm run test -- --run

  # The MCP server package: its own vitest (its DOM polyfill, linkedom, needs
  # `environment: node`, while the root vitest uses jsdom for the Next.js
  # app), the npm package as it is built, the draw.io file list, and the
  # canvas shell in a browser.
  mcp-shell:
    name: MCP Server & Shell
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          # HEAD^1 is the base branch for the version bump reminder below
          fetch-depth: 2

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "20"
          cache: "npm"
          cache-dependency-path: |
            package-lock.json
            packages/mcp-server/package-lock.json

      # The shell is bundled from the web app's components with the root's
      # esbuild, Tailwind and React; Playwright comes from the root too
      - name: Install dependencies
        run: npm ci

      - name: Install MCP server dependencies
        run: npm --prefix packages/mcp-server ci

      - name: Cache Playwright browsers
        uses: actions/cache@v5
        id: playwright-cache
        with:
          path: ~/.cache/ms-playwright
          key: playwright-${{ runner.os }}-${{ hashFiles('**/package-lock.json') }}

      - name: Install Playwright browsers
        if: steps.playwright-cache.outputs.cache-hit != 'true'
        run: npx playwright install chromium --with-deps

      - name: Install Playwright deps (cached)
        if: steps.playwright-cache.outputs.cache-hit == 'true'
        run: npx playwright install-deps chromium

      - name: Run MCP server unit tests
        run: npm --prefix packages/mcp-server test

      # Tests run from src/, so check the built npm package separately. The
      # build downloads the pinned draw.war and bundles a trimmed draw.io.
      - name: Build MCP server and check package contents
        run: npm --prefix packages/mcp-server run build && npm --prefix packages/mcp-server run check-package

      # The trimmed draw.io is cut from this list; the guard drives the full
      # copy (public/drawio) in Chromium and fails when the editor requests a
      # file the list does not have
      - name: Download the full draw.io
        run: node scripts/fetch-drawio.mjs

      - name: Check the MCP draw.io file list
        run: npm --prefix packages/mcp-server run check-drawio

      # The canvas shell in a browser, from the package as npm installs it:
      # the packed tarball goes into an empty directory, its dist/index.js is
      # started over stdio and headless Chromium opens the URL start_session
      # returns (packages/mcp-server/tests/e2e)
      - name: Run the MCP shell E2E tests on the packed tarball
        run: |
          mkdir -p "$RUNNER_TEMP/mcp-pack" "$RUNNER_TEMP/mcp-install"
          npm pack ./packages/mcp-server --pack-destination "$RUNNER_TEMP/mcp-pack"
          npm --prefix "$RUNNER_TEMP/mcp-install" install "$RUNNER_TEMP"/mcp-pack/*.tgz
          MCP_SERVER_ENTRY="$RUNNER_TEMP/mcp-install/node_modules/@next-ai-drawio/mcp-server/dist/index.js" \
            npm --prefix packages/mcp-server run test:e2e
        env:
          CI: true

      # The shell bundles the web app's canvas and the root's dependencies,
      # so a change under these paths (the ones publish-mcp.yml triggers on)
      # reaches users with the next MCP release, and publish-mcp.yml only
      # publishes a new version number
      - name: Remind to bump the MCP version when bundled code changed
        if: github.event_name == 'pull_request'
        run: |
          changed=$(git diff --name-only HEAD^1 HEAD -- components contexts hooks lib stores app/globals.css package-lock.json scripts packages/mcp-server)
          base_version=$(git show HEAD^1:packages/mcp-server/package.json | node -p "JSON.parse(require('fs').readFileSync(0, 'utf8')).version")
          head_version=$(node -p "require('./packages/mcp-server/package.json').version")
          if [ -n "$changed" ] && [ "$base_version" = "$head_version" ]; then
            echo "::warning::Code bundled into the MCP server changed without a version bump in packages/mcp-server/package.json (still ${head_version}). Bump it if the change should be published."
          fi

      - name: Upload test results
        uses: actions/upload-artifact@v6
        if: always()
        with:
          name: playwright-report-mcp-shell
          path: packages/mcp-server/test-results/
          retention-days: 7

  e2e:
    # Six jobs at once, each with a sixth of the tests and one worker: the
    # same conditions per test, a fraction of the time
    name: E2E Tests (${{ matrix.shard }}/6)
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        shard: [1, 2, 3, 4, 5, 6]
    steps:
      - uses: actions/checkout@v6

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Cache Playwright browsers
        uses: actions/cache@v5
        id: playwright-cache
        with:
          path: ~/.cache/ms-playwright
          key: playwright-${{ runner.os }}-${{ hashFiles('**/package-lock.json') }}

      - name: Install Playwright browsers
        if: steps.playwright-cache.outputs.cache-hit != 'true'
        run: npx playwright install chromium --with-deps

      - name: Install Playwright deps (cached)
        if: steps.playwright-cache.outputs.cache-hit == 'true'
        run: npx playwright install-deps chromium

      - name: Build app
        run: npm run build

      - name: Run E2E tests
        run: npm run test:e2e -- --shard=${{ matrix.shard }}/6
        env:
          CI: true

      - name: Upload test results
        uses: actions/upload-artifact@v6
        if: always()
        with:
          name: playwright-report-${{ matrix.shard }}
          path: playwright-report/
          retention-days: 7