name: Rust

on:
  push:
    branches:
      - main
  pull_request:
    types: [opened, synchronize, reopened]
    branches:
      - main

env:
  CARGO_TERM_COLOR: always
  SQLX_VERSION: 0.8.6
  SQLX_FEATURES: "rustls,postgres"
  DATABASE_URL: postgres://postgres:password@postgres:5432/newsletter
  APP_DATABASE__HOST: postgres
  APP_KV_STORE__HOST: redis

jobs:
  # This job builds and caches artifacts for other jobs to use
  build:
    name: Build
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4

      - name: Install mold linker
        run: |
          sudo apt-get update
          sudo apt-get install -y mold clang

      # LONG-TERM CACHE: Cargo registry (shared across workflows)
      - name: Cache cargo registry
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: cargo-registry-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            cargo-registry-

      # LONG-TERM CACHE: sqlx-cli binary (shared across workflows)
      - name: Cache sqlx-cli
        id: cache-sqlx
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/bin/sqlx
            ~/.cargo/bin/cargo-sqlx
          key: sqlx-cli-${{ env.SQLX_VERSION }}

      # LONG-TERM CACHE: Rust toolchain (shared across workflows)
      # Note: Keep cache: false if it times out, the toolchain itself is cached by rustup
      - name: Install the Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          cache: false

      - name: Install sqlx-cli
        if: steps.cache-sqlx.outputs.cache-hit != 'true'
        run: cargo install sqlx-cli
          --version=${{ env.SQLX_VERSION }}
          --features ${{ env.SQLX_FEATURES }}
          --no-default-features
          --locked

      # Build the project
      - name: Build
        run: cargo build --release

      # WORKFLOW-ONLY CACHE: Upload build artifacts for other jobs
      - name: Upload build artifacts
        uses: actions/upload-artifact@v3
        with:
          name: build-artifacts
          path: |
            target/
            ~/.cargo/bin/

  test:
    name: Test
    runs-on: ubuntu-latest
    needs: build # Wait for build to complete
    services:
      postgres:
        image: postgres
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: password
          POSTGRES_DB: newsletter
        ports:
          - 15432:5432
      redis:
        image: redis
        ports:
          - 16379:6379
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4

      - name: Install mold linker
        run: |
          sudo apt-get update
          sudo apt-get install -y mold clang

      # Download build artifacts from the build job
      - name: Download build artifacts
        uses: actions/download-artifact@v3
        with:
          name: build-artifacts

      - name: Install the Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          cache: false

      - name: Migrate database
        run: cargo sqlx migrate run

      - name: Run tests
        run: TEST_LOG=true cargo test

      - name: Check that queries are fresh
        run: cargo sqlx prepare --check --workspace

  fmt:
    name: Rustfmt
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      # LONG-TERM CACHE: Cargo registry
      - name: Cache cargo registry
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: cargo-registry-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            cargo-registry-

      - name: Install the Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          components: rustfmt
          cache: false

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

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    needs: build # Use artifacts from build
    env:
      SQLX_OFFLINE: true
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4

      - name: Install mold linker
        run: |
          sudo apt-get update
          sudo apt-get install -y mold clang

      # Download build artifacts
      - name: Download build artifacts
        uses: actions/download-artifact@v3
        with:
          name: build-artifacts

      - name: Install the Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          components: clippy
          cache: false

      - name: Linting
        run: cargo clippy -- -D warnings

  coverage:
    name: Code coverage
    runs-on: ubuntu-latest
    services:
      postgres:
        image: postgres
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: password
          POSTGRES_DB: newsletter
        ports:
          - 15432:5432
      redis:
        image: redis
        ports:
          - 16379:6379
    steps:
      - uses: actions/checkout@v4

      - name: Install mold linker
        run: |
          sudo apt-get update
          sudo apt-get install -y mold clang

      # LONG-TERM CACHE: Cargo registry
      - name: Cache cargo registry
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: cargo-registry-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            cargo-registry-

      # LONG-TERM CACHE: sqlx-cli
      - name: Cache sqlx-cli
        id: cache-sqlx-cov
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/bin/sqlx
            ~/.cargo/bin/cargo-sqlx
          key: sqlx-cli-${{ env.SQLX_VERSION }}

      # LONG-TERM CACHE: cargo-llvm-cov
      - name: Cache cargo-llvm-cov
        id: cache-llvm-cov
        uses: actions/cache@v3
        with:
          path: ~/.cargo/bin/cargo-llvm-cov
          key: cargo-llvm-cov-0.6.0 # Pin to a version

      - name: Install the Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          components: llvm-tools-preview
          cache: false

      - name: Install sqlx-cli
        if: steps.cache-sqlx-cov.outputs.cache-hit != 'true'
        run: cargo install sqlx-cli
          --version=${{ env.SQLX_VERSION }}
          --features ${{ env.SQLX_FEATURES }}
          --no-default-features
          --locked

      - name: Migrate database
        run: cargo sqlx migrate run

      - name: Install cargo-llvm-cov
        if: steps.cache-llvm-cov.outputs.cache-hit != 'true'
        uses: taiki-e/install-action@cargo-llvm-cov

      - name: Generate code coverage
        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info

      - name: Generate report
        run: cargo llvm-cov report --html --output-dir coverage