name: CI

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

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  # Decides whether the (heavy, ~6min) frontend job has anything to do.
  # The frontend job validates the web/desktop apps, the shared packages,
  # the install graph, and the selfhost / reserved-slugs scripts it runs;
  # a pure backend-only or docs-only PR touches none of those and gains
  # nothing from a full web build. This job emits a single `frontend`
  # output consumed by the frontend job below.
  changes:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read
    outputs:
      frontend: ${{ steps.decide.outputs.frontend }}
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Filter paths
        id: filter
        uses: dorny/paths-filter@v3
        with:
          # apps/docs is excluded from the frontend turbo run, so a
          # docs-only change does not need this job. apps/mobile has its
          # own mobile-verify workflow. Everything else the frontend job
          # touches is listed here; bias toward over-matching since a
          # missed path silently skips validation.
          filters: |
            frontend:
              - 'apps/web/**'
              - 'apps/desktop/**'
              - 'packages/**'
              - 'package.json'
              - '.npmrc'
              - 'pnpm-lock.yaml'
              - 'pnpm-workspace.yaml'
              - 'turbo.json'
              - '.github/workflows/ci.yml'
              - 'scripts/generate-reserved-slugs.mjs'
              - 'server/internal/handler/reserved_slugs.json'
              - 'scripts/selfhost-config.test.sh'
              - 'scripts/check.sh'
              - 'scripts/dev.sh'
              - 'scripts/local-env.sh'
              - '.env.example'
              - 'docker-compose.selfhost.yml'

      - name: Decide
        id: decide
        # Always run the frontend job on push to main (full validation);
        # on pull_request, run only when frontend-relevant paths changed.
        # The frontend job itself always runs and reports success — its
        # steps are gated on this output rather than the job being skipped
        # — so the required "frontend" status check is satisfied with a
        # genuine green instead of being left pending on filtered PRs.
        env:
          EVENT_NAME: ${{ github.event_name }}
          FRONTEND_CHANGED: ${{ steps.filter.outputs.frontend }}
        run: |
          if [ "$EVENT_NAME" != "pull_request" ] || [ "$FRONTEND_CHANGED" = "true" ]; then
            echo "frontend=true" >> "$GITHUB_OUTPUT"
          else
            echo "frontend=false" >> "$GITHUB_OUTPUT"
          fi

  frontend:
    needs: changes
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        uses: actions/checkout@v6

      - name: Setup pnpm
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        uses: pnpm/action-setup@v4

      - name: Setup Node.js
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: pnpm

      - name: Install dependencies
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        run: pnpm install

      - name: Test self-host env derivation
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        run: bash scripts/selfhost-config.test.sh

      - name: Verify reserved-slugs.ts is up to date
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        # Re-runs the generator and fails on any drift from the
        # checked-in TypeScript output. The Go side embeds the JSON
        # source directly, so a passing diff here proves both sides
        # share one source of truth.
        run: |
          pnpm generate:reserved-slugs
          git diff --exit-code -- packages/core/paths/reserved-slugs.ts

      - name: Build, type check, lint, and test
        if: ${{ needs.changes.outputs.frontend == 'true' }}
        # Mobile lives in a parallel mobile-verify workflow (path-filtered
        # to apps/mobile/** + packages/core/**) so it doesn't add
        # ~50s of expo-lint + tsc to every web/desktop PR. Keep this
        # filter in sync with the root package.json scripts, which also
        # exclude @multica/mobile.
        run: pnpm exec turbo build typecheck lint test --filter='!@multica/docs' --filter='!@multica/mobile'

  backend:
    runs-on: ubuntu-latest
    services:
      postgres:
        image: pgvector/pgvector:pg17
        env:
          POSTGRES_DB: multica
          POSTGRES_USER: multica
          POSTGRES_PASSWORD: multica
        ports:
          - 5432:5432
        options: >-
          --health-cmd "pg_isready -U multica -d multica"
          --health-interval 5s
          --health-timeout 5s
          --health-retries 20
      redis:
        image: redis:7-alpine
        ports:
          - 6379:6379
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 5s
          --health-timeout 5s
          --health-retries 10
    env:
      DATABASE_URL: postgres://multica:multica@localhost:5432/multica?sslmode=disable
      # Wires up the RedisLocalSkill*_test.go suite. Distinct from REDIS_URL
      # (which would flip the server binary itself onto the Redis-backed
      # realtime relay + request stores); the tests talk to this Redis
      # directly so they run alongside the Postgres-backed suite.
      REDIS_TEST_URL: redis://localhost:6379/1
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version: "1.26.1"
          cache-dependency-path: server/go.sum

      - name: Build
        run: cd server && go build ./...

      - name: Run migrations
        run: cd server && go run ./cmd/migrate up

      - name: Test
        run: cd server && go test -race ./...

  installer:
    # Stub-driven shell tests for scripts/install.sh. Kept off the heavy
    # backend job so installer regressions surface independently, and
    # exercised on macOS too because the installer targets macOS/Homebrew
    # and `tar` / `sed` / `mktemp` differ between BSD and GNU userlands.
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Test shell installers
        run: bash scripts/install.test.sh