name: php-fpm-build

on:
  push:
    branches: [main]
    paths:
      - "php-fpm/**"
      - "shared/php-fpm/**"
      - ".github/workflows/php-fpm.yml"
  pull_request:
    branches: [main]
    paths:
      - "php-fpm/**"
      - "shared/php-fpm/**"
      - ".github/workflows/php-fpm.yml"
  workflow_dispatch:
    inputs:
      lane:
        description: 'Lane to build (e.g. 7.4). Use "all" to build all lanes. Leave blank to build based on changes.'
        required: false
        default: ""

jobs:
  lanes:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 # Fetch all history for accurate change detection

      - name: Get all PHP lanes
        id: get-lanes
        run: |
          lanes=$(find php-fpm -mindepth 1 -maxdepth 1 -type d -exec basename {} \; | jq -R . | jq -s .)
          echo "lanes=$lanes" >> $GITHUB_OUTPUT
        shell: bash

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v44
        with:
          files: |
            php-fpm/**
            shared/php-fpm/**
            .github/workflows/php-fpm.yml

      - name: Determine lanes to build
        id: set-matrix
        shell: bash
        run: |
          all_lanes='${{ steps.get-lanes.outputs.lanes }}'
          req_lane="${{ github.event.inputs.lane }}"
          changed_files="${{ steps.changed-files.outputs.all_changed_files }}"

          lanes_to_build="[]"
          build_all=false

          # 1. Handle workflow_dispatch input
          if [[ -n "$req_lane" ]]; then
            if [[ "$req_lane" == "all" ]]; then
              build_all=true
            else
              lanes_to_build="[\"$req_lane\"]"
            fi
          else
            # 2. Check for changes that trigger a full rebuild
            for file in $changed_files; do
              if [[ "$file" == ".github/workflows/php-fpm.yml" || "$file" == shared/php-fpm/* ]]; then
                build_all=true
                break
              fi
            done
          fi

          # 3. Build matrix based on flags
          if [[ "$build_all" == true ]]; then
            lanes_to_build="$all_lanes"
          elif [[ -n "$changed_files" && "$lanes_to_build" == "[]" ]]; then
            # 4. If not a full build, determine changed lanes
            lanes=$(echo "$changed_files" | tr ' ' '\n' | grep '^php-fpm/' | cut -d'/' -f2 | sort -u | jq -R . | jq -s .)
            if [[ -n "$lanes" && "$lanes" != "[]" ]]; then
              lanes_to_build="$lanes"
            fi
          fi

          matrix="{\"lane\":$lanes_to_build}"
          echo "matrix=$matrix" >> $GITHUB_OUTPUT

  build:
    needs: lanes
    if: ${{ needs.lanes.outputs.matrix != '{"lane":[]}' }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.lanes.outputs.matrix) }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to the Container Registry
        uses: docker/login-action@v3
        with:
          registry: gitea.auvem.com
          username: ${{ vars.REGISTRY_USER || github.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: gitea.auvem.com/auvem/wordpress-docker/php-fpm
          tags: |
            type=raw,value={{matrix.lane}}-stable
            type=raw,value={{matrix.lane}}-{{sha}}

      - name: Build and push Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./php-fpm/${{ matrix.lane }}/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64