name: Haskell CI

on:
  pull_request:
  merge_group:

jobs:
  build:
    runs-on: ${{ matrix.os }}

    defaults:
      run:
        shell: bash

    strategy:
      fail-fast: false
      matrix:
        ghc: ["8.10", "9.0", "9.2", "9.4", "9.6", "9.8", "9.10"]
        os: [ubuntu-latest]

    steps:
    - name: Install Haskell
      uses: haskell-actions/setup@v2
      id: setup-haskell
      with:
        ghc-version: ${{ matrix.ghc }}
        cabal-version: 3.8.1.0

    - name: Select build directory
      run: |
        if [ "$RUNNER_OS" == Windows ]; then
          CABAL_BUILDDIR="D:\\a\\_temp\\dist"
        else
          CABAL_BUILDDIR="dist-newstyle"
        fi

        echo "CABAL_BUILDDIR=$CABAL_BUILDDIR"
        echo "CABAL_BUILDDIR=$CABAL_BUILDDIR" >> $GITHUB_ENV

    - name: Set cache version
      run: echo "CACHE_VERSION=9w76Z3Q" >> $GITHUB_ENV

    - name: Set up temp directory
      env:
        RUNNER_TEMP: ${{ runner.temp }}
      run: |
        echo "TMPDIR=$RUNNER_TEMP"  >> $GITHUB_ENV
        echo "TMP=$RUNNER_TEMP"     >> $GITHUB_ENV

    - uses: actions/checkout@v4

    - name: Record dependencies
      id: record-deps
      run: |
        cabal build all --dry-run
        cat dist-newstyle/cache/plan.json | jq -r '."install-plan"[].id' | sort | uniq > dependencies.txt

    - name: Cache `cabal store`
      uses: actions/cache@v4
      with:
        path: ${{ steps.setup-haskell.outputs.cabal-store }}
        key: cabal-store-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('dependencies.txt') }}
        restore-keys: cabal-store-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}

    - name: Cache `dist-newstyle`
      uses: actions/cache@v4
      with:
        path: |
          dist-newstyle
          !dist-newstyle/**/.git
        key: cache-dist-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}

    - name: Use cabal.project.local
      run: |
        cat .github/workflows/cabal.project.local >> ./cabal.project.local
        cat ./cabal.project.local

    - name: Build dependencies
      run: cabal --builddir="$CABAL_BUILDDIR" build --only-dependencies all

    - name: Build projects [build]
      run: cabal --builddir="$CABAL_BUILDDIR" build all

    - name: free-category [test]
      run: cabal --builddir="$CABAL_BUILDDIR" run free-category:test-cats

    - name: free-category [benchmarks]
      run: cabal build free-category:benchmarks