name: CI

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

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

jobs:
  check-changes:
    name: Check for app changes
    runs-on: ubuntu-latest
    outputs:
      should_test: ${{ steps.filter.outputs.should_test }}
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 0

      - name: Check changed files
        id: filter
        run: |
          if [ "${{ github.event_name }}" = "push" ]; then
            echo "should_test=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          CHANGED=$(git diff --name-only origin/main...HEAD || true)
          if echo "$CHANGED" | grep -qE '^(src/|frontend/|tests/|package\.json|package-lock\.json|tsconfig\.json|vite\.config|vitest\.config|playwright\.config)'; then
            echo "should_test=true" >> "$GITHUB_OUTPUT"
          else
            echo "No application code changed, skipping tests"
            echo "should_test=false" >> "$GITHUB_OUTPUT"
          fi

  setup:
    name: Install & Build
    needs: check-changes
    if: needs.check-changes.outputs.should_test == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Setup Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: '20.x'

      - name: Cache node_modules
        id: cache-nm
        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
        with:
          path: node_modules
          key: node-modules-${{ runner.os }}-node20-${{ hashFiles('package-lock.json') }}

      - name: Install dependencies
        if: steps.cache-nm.outputs.cache-hit != 'true'
        run: npm ci

      - name: Build
        run: npm run build

      - name: Upload build output
        uses: actions/upload-artifact@ff15f0306b3f739f7b6fd43fb5d26cd321bd4de5 # v4.6.2
        with:
          name: dist
          path: dist/
          retention-days: 1

  test:
    name: Unit & Integration Tests
    needs: setup
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Setup Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: '20.x'

      - name: Restore node_modules from cache
        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
        with:
          path: node_modules
          key: node-modules-${{ runner.os }}-node20-${{ hashFiles('package-lock.json') }}

      - name: Run tests
        run: npm test

  lint:
    name: Lint & Type Check
    needs: setup
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Setup Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: '20.x'

      - name: Restore node_modules from cache
        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
        with:
          path: node_modules
          key: node-modules-${{ runner.os }}-node20-${{ hashFiles('package-lock.json') }}

      - name: Type check
        run: npm run type-check

  e2e:
    name: E2E Tests
    needs: setup
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Setup Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: '20.x'

      - name: Restore node_modules from cache
        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
        with:
          path: node_modules
          key: node-modules-${{ runner.os }}-node20-${{ hashFiles('package-lock.json') }}

      - name: Download build output
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
        with:
          name: dist
          path: dist/

      - name: Check build artifacts
        run: |
          test -f dist/index.js
          test -f dist/server.js
          test -d dist/frontend

      - name: Get Playwright version
        id: pw-version
        run: echo "version=$(node -e "console.log(require('./node_modules/@playwright/test/package.json').version)")" >> "$GITHUB_OUTPUT"

      - name: Cache Playwright browsers
        id: cache-pw
        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
        with:
          path: ~/.cache/ms-playwright
          key: playwright-${{ runner.os }}-${{ steps.pw-version.outputs.version }}

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

      - name: Install Playwright system deps
        if: steps.cache-pw.outputs.cache-hit == 'true'
        run: ./node_modules/.bin/playwright install-deps chromium

      - name: Run E2E tests
        run: npm run test:e2e
        env:
          EXCALIDRAW_DB_PATH: /tmp/excalidraw-e2e-ci.db

      - name: Upload Playwright report
        if: failure()
        uses: actions/upload-artifact@ff15f0306b3f739f7b6fd43fb5d26cd321bd4de5 # v4.6.2
        with:
          name: playwright-report
          path: playwright-report/
          retention-days: 7

  ci-status:
    runs-on: ubuntu-latest
    continue-on-error: false
    name: CI Status Check
    needs: [check-changes, setup, test, lint, e2e]
    if: always()
    permissions:
      statuses: write
    steps:
      - name: Failed
        id: failed
        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
        run: |
          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
          -d '{ "state" : "failure" , "context" : "github/ci-status-check" , "description" : "CI checks failed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}
          exit 1
      - name: Success
        if: steps.failed.conclusion == 'skipped'
        run: |
          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
          -d '{ "state" : "success" , "context" : "github/ci-status-check" , "description" : "CI checks passed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}