name: Push images

on:
  push:
    branches:
    - master
  workflow_dispatch:

env:
  IMAGE_NAME: pypsa/eur-dev-env

jobs:
  push-image:
    name: dev-env
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v7
      with:
        fetch-depth: 0

    - name: 'Get last commit that changed pixi env or Dockerfile'
      run: |
        hash_last_changed=$(git log -1 --pretty=format:%H -- pixi.toml pixi.lock docker/dev-env/Dockerfile)
        echo "hash_last_changed=$hash_last_changed" >> $GITHUB_ENV

    - name: 'Login to GitHub Container Registry'
      uses: docker/login-action@v4
      with:
        registry: ghcr.io
        username: ${{ github.repository_owner }}
        password: ${{ secrets.REGISTRY_TOKEN }}

    - name: 'Build new image' # only build if the locked envs file was modified
      if: env.hash_last_changed == github.sha || github.event_name == 'workflow_dispatch'
      run: |
        docker build . --file docker/dev-env/Dockerfile --tag ghcr.io/${{ env.IMAGE_NAME }}:${{ github.sha }}
        docker push ghcr.io/${{ env.IMAGE_NAME }}:${{ github.sha }}

        # Add latest tag if on main branch
        if [ "${{ github.ref }}" == "refs/heads/master" ]; then
          docker tag ghcr.io/${{ env.IMAGE_NAME }}:${{ github.sha }} ghcr.io/${{ env.IMAGE_NAME }}:latest
          docker push ghcr.io/${{ env.IMAGE_NAME }}:latest
        fi

    - name: 'Add SHA tag to existing image' # when rebuild is not needed
      if: env.hash_last_changed != github.sha
      run: |-
        docker pull ghcr.io/${{ env.IMAGE_NAME }}:${{ env.hash_last_changed }}
        docker tag ghcr.io/${{ env.IMAGE_NAME }}:${{ env.hash_last_changed }} ghcr.io/${{ env.IMAGE_NAME }}:${{ github.sha }}
        docker push ghcr.io/${{ env.IMAGE_NAME }}:${{ github.sha }}