name: Dev Image

on:
  push:
    branches:
      - "main"
    paths:
      - "Dockerfile.dev"
      - ".github/workflows/dev-image.yml"
  pull_request:
    branches:
      - "main"
    paths:
      - "Dockerfile.dev"
      - ".github/workflows/dev-image.yml"
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: "dev-image-${{ github.ref }}"
  cancel-in-progress: true

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Revision tag (YYYYMMDD-shortsha + full SHA aliases)
        id: revision
        run: |
          set -eu
          short=$(git rev-parse --short=7 HEAD)
          d=$(TZ=UTC0 git log -1 --format=%cd --date=format:%Y%m%d HEAD)
          echo "image_tag=${d}-${short}" >> "$GITHUB_OUTPUT"

      - name: Log in to GHCR
        if: ${{ github.event_name != 'pull_request' }}
        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0

      # `tachi-ci` = the minimal `base` stage. Used as the `container:` image
      # for every workspace CI job. Kept small so the per-job image pull is
      # cheap.
      - name: Build and push tachi-ci (base stage)
        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
        with:
          context: .
          file: Dockerfile.dev
          target: base
          push: ${{ github.ref == 'refs/heads/main' && github.event_name != 'pull_request' }}
          tags: |
            ghcr.io/zkldi/tachi-ci:main
            ghcr.io/zkldi/tachi-ci:latest
            ghcr.io/zkldi/tachi-ci:${{ steps.revision.outputs.image_tag }}
            ghcr.io/zkldi/tachi-ci:${{ github.sha }}
          cache-from: type=gha,scope=dev-image-base
          cache-to: type=gha,mode=max,scope=dev-image-base

      # `tachi-dev` = full devcontainer image (`dev` stage on top of `base`).
      # Pulled by devs once and rebuilt rarely; CI never touches it.
      - name: Build and push tachi-dev (dev stage)
        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
        with:
          context: .
          file: Dockerfile.dev
          target: dev
          push: ${{ github.ref == 'refs/heads/main' && github.event_name != 'pull_request' }}
          tags: |
            ghcr.io/zkldi/tachi-dev:main
            ghcr.io/zkldi/tachi-dev:latest
            ghcr.io/zkldi/tachi-dev:${{ steps.revision.outputs.image_tag }}
            ghcr.io/zkldi/tachi-dev:${{ github.sha }}
          cache-from: |
            type=gha,scope=dev-image-dev
            type=gha,scope=dev-image-base
          cache-to: type=gha,mode=max,scope=dev-image-dev