name: "images4docker: Build"

on:
  workflow_dispatch:
  workflow_call:

permissions:
  contents: read
  packages: write

jobs:
  prepare:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.make.outputs.matrix }}
      count: ${{ steps.make.outputs.count }}
    steps:
      - uses: actions/checkout@v6
      - id: make
        run: |
          set -euo pipefail

          entries=()
          for f in images4docker/dockerfiles/*.Dockerfile; do
            name="$(basename "$f" .Dockerfile)"
            entries+=("$name|$f")
          done

          json='{"include":['
          first=true
          for entry in "${entries[@]}"; do
            IFS='|' read -r name dockerfile <<< "$entry"
            $first || json+=','
            first=false
            json+="{\"name\":\"$name\",\"dockerfile\":\"$dockerfile\"}"
          done
          json+=']}'

          echo "matrix=$json" >> "$GITHUB_OUTPUT"
          echo "count=${#entries[@]}" >> "$GITHUB_OUTPUT"

  build:
    needs: prepare
    if: needs.prepare.outputs.count != '0'
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      max-parallel: 6
      matrix: ${{ fromJSON(needs.prepare.outputs.matrix) }}
    steps:
      - uses: actions/checkout@v6

      - name: Login to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Compute image tags
        id: tagmeta
        run: |
          set -euo pipefail
          short_sha="${GITHUB_SHA::12}"
          ts="$(date -u +%Y%m%d-%H%M%S)"
          echo "sha_tag=sha-${short_sha}" >> "$GITHUB_OUTPUT"
          echo "immutable_tag=${ts}-r${GITHUB_RUN_ID}-a${GITHUB_RUN_ATTEMPT}-${short_sha}" >> "$GITHUB_OUTPUT"

      - name: Build and push image
        uses: docker/build-push-action@v6
        with:
          context: images4docker
          file: ${{ matrix.dockerfile }}
          push: true
          provenance: false
          tags: |
            ghcr.io/project-tick/project-tick/${{ matrix.name }}:latest
            ghcr.io/project-tick/project-tick/${{ matrix.name }}:${{ steps.tagmeta.outputs.sha_tag }}
            ghcr.io/project-tick/project-tick/${{ matrix.name }}:${{ steps.tagmeta.outputs.immutable_tag }}