name: metrics
on:
  push:
    branches:
      - master

env:
  CARGO_INCREMENTAL: 0
  CARGO_NET_RETRY: 10
  RUSTFLAGS: "-D warnings -W unreachable-pub"
  RUSTUP_MAX_RETRIES: 10

jobs:
  setup_cargo:
    if: github.repository == 'rust-lang/rust-analyzer'
    runs-on: ubuntu-latest
    steps:
      - name: Install Rust toolchain
        run: |
          rustup update --no-self-update stable
          rustup component add rustfmt rust-src
          rustup default stable
      - name: Cache cargo
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/bin/
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
          key: ${{ runner.os }}-cargo-${{ github.sha }}

  build_metrics:
    runs-on: ubuntu-latest
    needs: setup_cargo

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Restore cargo cache
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/bin/
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
          key: ${{ runner.os }}-cargo-${{ github.sha }}

      - name: Collect build metrics
        run: cargo xtask metrics build

      - name: Cache target
        uses: actions/cache@v3
        with:
          path: target/
          key: ${{ runner.os }}-target-${{ github.sha }}

      - name: Upload build metrics
        uses: actions/upload-artifact@v3
        with:
          name: build-${{ github.sha }}
          path: target/build.json
          if-no-files-found: error

  other_metrics:
    strategy:
      matrix:
        names: [self, ripgrep, webrender, diesel]
    runs-on: ubuntu-latest
    needs: [setup_cargo, build_metrics]

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Restore cargo cache
        uses: actions/cache@v3
        with:
          path: |
            ~/.cargo/bin/
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
          key: ${{ runner.os }}-cargo-${{ github.sha }}

      - name: Restore target cache
        uses: actions/cache@v3
        with:
          path: target/
          key: ${{ runner.os }}-target-${{ github.sha }}

      - name: Collect metrics
        run: cargo xtask metrics ${{ matrix.names }}

      - name: Upload metrics
        uses: actions/upload-artifact@v3
        with:
          name: ${{ matrix.names }}-${{ github.sha }}
          path: target/${{ matrix.names }}.json
          if-no-files-found: error

  generate_final_metrics:
    runs-on: ubuntu-latest
    needs: [build_metrics, other_metrics]
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Download build metrics
        uses: actions/download-artifact@v3
        with:
          name: build-${{ github.sha }}

      - name: Download self metrics
        uses: actions/download-artifact@v3
        with:
          name: self-${{ github.sha }}

      - name: Download ripgrep metrics
        uses: actions/download-artifact@v3
        with:
          name: ripgrep-${{ github.sha }}

      - name: Download webrender metrics
        uses: actions/download-artifact@v3
        with:
          name: webrender-${{ github.sha }}

      - name: Download diesel metrics
        uses: actions/download-artifact@v3
        with:
          name: diesel-${{ github.sha }}

      - name: Combine json
        run: |
          git clone --depth 1 https://$METRICS_TOKEN@github.com/rust-analyzer/metrics.git
          jq -s ".[0] * .[1] * .[2] * .[3] * .[4]" build.json self.json ripgrep.json webrender.json diesel.json -c >> metrics/metrics.json
          cd metrics
          git add .
          git -c user.name=Bot -c user.email=dummy@example.com commit --message 📈
          git push origin master
    env:
      METRICS_TOKEN: ${{ secrets.METRICS_TOKEN }}