name: CI

on:
  push:
    branches:
      - master
      - main
  pull_request:
    branches:
      - master
      - main

jobs:
  # Fast path: matrix-free / DOF-based assembler bundles only (~400 tests).
  # Uses `test/runtests.jl` topic filtering via `Pkg.test(test_args=...)`.
  test-assemblers:
    name: Julia ${{ matrix.version }} - assemblers topic (fast)
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        version:
          - '1'
    steps:
      - uses: actions/checkout@v4

      - uses: julia-actions/setup-julia@v2
        with:
          version: ${{ matrix.version }}

      - name: Layer contract (src architecture)
        run: julia scripts/check_layer_contract.jl

      - uses: julia-actions/cache@v2

      - uses: julia-actions/julia-buildpkg@v1

      - uses: julia-actions/julia-runtest@v1
        with:
          test_args: assemblers
          coverage: false

  mpi-partitioned-matvec-smoke:
    name: MPI partitioned matvec + CG smoke (3 ranks)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: julia-actions/setup-julia@v2
        with:
          version: '1'

      - uses: julia-actions/cache@v2

      # MPI is a weak dependency: the default package environment does not install it.
      # Use a throwaway env with `Pkg.develop` + `Pkg.add("MPI")` so `using MPI` loads
      # `JuliaFEMMPIExt` when running the smoke driver under mpiexec.
      - name: mpiexec smoke scripts (matvec + CG)
        working-directory: ${{ github.workspace }}
        run: |
          export MPI_SMOKE_ENV="$(mktemp -d)"
          julia -e '
            using Pkg
            envdir = ENV["MPI_SMOKE_ENV"]
            root = pwd()
            Pkg.activate(envdir)
            Pkg.develop(path=root)
            Pkg.add("MPI")
            Pkg.instantiate()
            using MPI
            mpidir = joinpath(root, "test", "mpi")
            for script_name in ("partitioned_matvec_smoke.jl", "partitioned_matvec_cg.jl")
              script = joinpath(mpidir, script_name)
              run(`$(MPI.mpiexec()) -n 3 $(Base.julia_cmd()) --project=$envdir --startup-file=no $script`)
            end
          '

  test:
    name: Julia ${{ matrix.version }} - ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        version:
          - '1.10'  # LTS
          - '1'     # Latest stable
        os:
          - ubuntu-latest
        
    steps:
      - uses: actions/checkout@v4
      
      - uses: julia-actions/setup-julia@v2
        with:
          version: ${{ matrix.version }}
          
      - name: Layer contract (src architecture)
        run: julia scripts/check_layer_contract.jl

      - uses: julia-actions/cache@v2
      
      - uses: julia-actions/julia-buildpkg@v1
      
      - uses: julia-actions/julia-runtest@v1
      
      - uses: julia-actions/julia-processcoverage@v1
      
      - uses: codecov/codecov-action@v4
        with:
          files: lcov.info
          token: ${{ secrets.CODECOV_TOKEN }}
          fail_ci_if_error: false