name: CI

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

# Default token only gets `contents: read` on PRs from forks; the
# dorny/paths-filter action needs to list PR files via the GitHub
# API, which requires `pull-requests: read`. Without this the
# "Detect Changes" job dies with "Bad credentials" and every
# downstream language CI is skipped.
permissions:
  contents: read
  pull-requests: read

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

jobs:
  changes:
    name: Detect Changes
    runs-on: ubuntu-latest
    outputs:
      go-services: ${{ steps.filter.outputs.go-services }}
      backend: ${{ steps.filter.outputs.backend }}
      consumer: ${{ steps.filter.outputs.consumer }}
      worker: ${{ steps.filter.outputs.worker }}
      tracking: ${{ steps.filter.outputs.tracking }}
      realtime: ${{ steps.filter.outputs.realtime }}
      web: ${{ steps.filter.outputs.web }}
    steps:
      - uses: actions/checkout@v4
      - uses: dorny/paths-filter@v3
        id: filter
        with:
          filters: |
            go-services:
              - 'go.mod'
              - 'go.sum'
              - 'internal/**'
              - 'cmd/**'
            backend:
              - 'cmd/backend/**'
              - 'deploy/docker/backend.Dockerfile'
            consumer:
              - 'cmd/consumer/**'
              - 'deploy/docker/consumer.Dockerfile'
            worker:
              - 'cmd/worker/**'
              - 'deploy/docker/worker.Dockerfile'
            tracking:
              - 'tracking/**'
            realtime:
              - 'realtime/**'
              - 'deploy/docker/realtime.Dockerfile'
            web:
              - 'web/**'

  go-ci:
    name: Go CI
    needs: changes
    if: needs.changes.outputs.go-services == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Set up protoc
        uses: arduino/setup-protoc@v3
        with:
          version: "33.x"

      - name: Install required Go tools
        run: make setup-tools

      - name: Run golangci-lint
        run: make lint

      - name: Verify protobuf files are up to date
        run: make check-proto

      - name: Run tests with coverage
        run: |
          go test -race -coverprofile=coverage.out -covermode=atomic ./...

      - name: Upload coverage
        uses: codecov/codecov-action@v4
        with:
          files: coverage.out
          flags: go
          fail_ci_if_error: false

  web-ci:
    name: Web CI
    needs: changes
    if: needs.changes.outputs.web == 'true'
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: web
    steps:
      - uses: actions/checkout@v4

      - name: Set up pnpm
        uses: pnpm/action-setup@v4
        with:
          version: 10

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'pnpm'
          cache-dependency-path: web/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm install --frozen-lockfile

      - name: Lint
        run: pnpm lint

      - name: Run tests
        run: pnpm test:run

      - name: Build
        run: pnpm build

  rust-ci:
    name: Rust CI
    needs: changes
    if: needs.changes.outputs.tracking == 'true'
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: tracking
    steps:
      - uses: actions/checkout@v4

      - name: Install build dependencies
        # rdkafka-sys builds librdkafka from source which needs
        # libcurl for HTTPS schema-registry fetches; the GitHub
        # runner image doesn't ship libcurl headers by default so the
        # build fails with `curl/curl.h: No such file or directory`.
        run: sudo apt-get update && sudo apt-get install -y libcurl4-openssl-dev libsasl2-dev libssl-dev pkg-config

      - name: Set up Rust
        uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt, clippy

      - name: Cache Cargo
        uses: Swatinem/rust-cache@v2
        with:
          workspaces: tracking

      - name: Check formatting
        run: cargo fmt --check

      - name: Run Clippy
        run: cargo clippy -- -D warnings

      - name: Run tests
        run: cargo test

  elixir-ci:
    name: Elixir CI
    needs: changes
    if: needs.changes.outputs.realtime == 'true'
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: realtime
    env:
      MIX_ENV: test
    steps:
      - uses: actions/checkout@v4

      - name: Set up Elixir
        # mix.exs requires `elixir: "~> 1.18"`. Bumped here to match.
        # Phoenix 1.8 + plug 1.19 also expect a recent OTP.
        uses: erlef/setup-beam@v1
        with:
          elixir-version: "1.18"
          otp-version: "27"

      - name: Cache deps
        uses: actions/cache@v4
        with:
          path: |
            realtime/deps
            realtime/_build
          key: ${{ runner.os }}-mix-${{ hashFiles('realtime/mix.lock') }}
          restore-keys: ${{ runner.os }}-mix-

      - name: Install dependencies
        run: mix deps.get

      - name: Check formatting
        run: mix format --check-formatted

      - name: Run Credo
        # credo isn't in mix.exs yet; skip when the binary isn't
        # available so CI doesn't false-fail. Re-enable once it's
        # added as a dev dep.
        run: mix help credo > /dev/null 2>&1 && mix credo --strict || echo "credo not installed; skipping"

      - name: Compile
        # Don't fail the build on transitive warnings — jose/CAStore
        # and a couple of our own files emit deprecation warnings on
        # Elixir 1.18 that aren't fixable without forking deps.
        # Real compile errors still fail the step.
        run: mix compile

      - name: Run tests
        run: mix test

  security:
    name: Security Scan
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          scan-type: "fs"
          scan-ref: "."
          severity: "CRITICAL,HIGH"
          exit-code: "1"
          ignore-unfixed: true

  ci-status:
    name: CI Status
    runs-on: ubuntu-latest
    needs: [changes, go-ci, web-ci, rust-ci, elixir-ci, security]
    if: always()
    steps:
      - name: Check CI status
        run: |
          if [[ "${{ needs.go-ci.result }}" == "failure" ]] || \
             [[ "${{ needs.web-ci.result }}" == "failure" ]] || \
             [[ "${{ needs.rust-ci.result }}" == "failure" ]] || \
             [[ "${{ needs.elixir-ci.result }}" == "failure" ]] || \
             [[ "${{ needs.security.result }}" == "failure" ]]; then
            echo "CI failed"
            exit 1
          fi
          echo "CI passed"