name: Build and Push Docker Images

on:
  push:
    branches: [main]
    paths:
      - 'images/**'
  workflow_dispatch:

env:
  REGISTRY: gitea.arnodo.fr

jobs:
  detect-changes:
    runs-on: docker
    container:
      image: alpine:3.20
    outputs:
      image_list: ${{ steps.changes.outputs.image_list }}
      has_changes: ${{ steps.changes.outputs.has_changes }}
    steps:
      - name: Install dependencies
        run: apk add --no-cache git

      - name: Checkout repository
        run: |
          git clone --depth 2 https://gitea.arnodo.fr/${{ gitea.repository }}.git .
          git checkout ${{ gitea.sha }}

      - name: Detect images to build
        id: changes
        run: |
          echo "Event: ${{ gitea.event_name }}"
          
          if [ "${{ gitea.event_name }}" = "workflow_dispatch" ]; then
            echo "Manual trigger - building all images"
            # List all directories with Dockerfile
            IMAGES=$(find images -mindepth 1 -maxdepth 1 -type d -exec test -f {}/Dockerfile \; -print | xargs -n1 basename | tr '\n' ',' | sed 's/,$//')
          else
            echo "Push event - detecting changes"
            IMAGES=$(git diff --name-only HEAD~1 HEAD -- images/ 2>/dev/null | cut -d'/' -f2 | sort -u | grep -v '^$' | tr '\n' ',' | sed 's/,$//')
          fi
          
          echo "Detected images: $IMAGES"
          
          if [ -z "$IMAGES" ]; then
            echo "has_changes=false" >> $GITHUB_OUTPUT
            echo "image_list=[]" >> $GITHUB_OUTPUT
          else
            # Convert to JSON array
            JSON=$(echo "$IMAGES" | tr ',' '\n' | sed 's/.*/"&"/' | tr '\n' ',' | sed 's/,$//' | sed 's/^/[/' | sed 's/$/]/')
            echo "JSON: $JSON"
            echo "has_changes=true" >> $GITHUB_OUTPUT
            echo "image_list=$JSON" >> $GITHUB_OUTPUT
          fi

  build:
    needs: detect-changes
    if: needs.detect-changes.outputs.has_changes == 'true'
    runs-on: docker
    container:
      image: docker:cli
    strategy:
      matrix:
        image: ${{ fromJson(needs.detect-changes.outputs.image_list) }}
      fail-fast: false
    steps:
      - name: Install git and checkout
        run: |
          apk add --no-cache git
          git clone --depth 1 https://gitea.arnodo.fr/${{ gitea.repository }}.git .

      - name: Login to Registry
        run: |
          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login ${{ env.REGISTRY }} -u ${{ gitea.actor }} --password-stdin

      - name: Build and Push
        run: |
          IMAGE_NAME="${{ env.REGISTRY }}/damien/${{ matrix.image }}"
          IMAGE_PATH="images/${{ matrix.image }}"
          
          echo "Building ${IMAGE_NAME}:latest from ${IMAGE_PATH}"
          
          docker build -t "${IMAGE_NAME}:latest" "${IMAGE_PATH}"
          docker push "${IMAGE_NAME}:latest"
          
          echo "✅ Pushed ${IMAGE_NAME}:latest"