name: Backend PR

on:
  workflow_call:
  workflow_dispatch:
  pull_request:
    branches:
    - master
    paths:
    - 'backend/**'
    - 'libs/**'

jobs:
  libs:
    name: Build libs
    strategy:
      matrix:
        target: [amd64, arm64]
        include:
          - target: amd64
            snapshot_command: ./build-v8-snapshot.sh
            artifact_name: js_snapshot
            artifact_path: libs/js_engine/src/artifacts/JS_SNAPSHOT.bin
          - target: arm64
            snapshot_command: ./build-arm-v8-snapshot.sh
            artifact_name: arm_js_snapshot
            artifact_path: libs/js_engine/src/artifacts/ARM_JS_SNAPSHOT.bin
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: recursive
        
    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1
      
    - name: Set up Docker Buildx        
      uses: docker/setup-buildx-action@v1
    
    - uses: actions/cache@v3
      with:
        path: |
          ~/.cargo/bin/
          ~/.cargo/registry/index/
          ~/.cargo/registry/cache/
          ~/.cargo/git/db/
          target/
        key: ${{ runner.os }}-cargo-libs-${{ matrix.target }}-${{ hashFiles('libs/Cargo.lock') }}

    - name: Build v8 snapshot
      run: ${{ matrix.snapshot_command }}
      working-directory: libs

    - uses: actions/upload-artifact@v3
      with:
        name: ${{ matrix.artifact_name }}
        path: ${{ matrix.artifact_path }}

  backend:
    name: Build backend
    runs-on: ubuntu-latest
    needs: libs
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: recursive
    
    - name: Download arm_js_snapshot artifact
      uses: actions/download-artifact@v3
      with:
        name: arm_js_snapshot
        path: libs/js_engine/src/artifacts/
        
    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1
      
    - name: Set up Docker Buildx        
      uses: docker/setup-buildx-action@v1

    - uses: actions-rs/toolchain@v1
      with:
        toolchain: stable
        override: true
    
    - uses: actions/cache@v3
      with:
        path: |
          ~/.cargo/bin/
          ~/.cargo/registry/index/
          ~/.cargo/registry/cache/
          ~/.cargo/git/db/
          target/
        key: ${{ runner.os }}-cargo-backend-${{ hashFiles('backend/Cargo.lock') }}

    - name: Build backend
      run: make backend

    - name: 'Tar files to preserve file permissions'
      run: tar -cvf backend.tar backend/target/aarch64-unknown-linux-gnu/release/embassy*

    - uses: actions/upload-artifact@v3
      with:
        name: backend
        path: backend.tar