name: Main CI-Backend

on:
  workflow_dispatch:
  push:
    branches:
      - main
    paths:
      - 'server/**/*.java'
      - 'server/**/*.xml'
      - 'server/pom.xml'
      - '.github/workflows/main-server.yml'

jobs:
  build-and-push:
    name: Build & Push
    runs-on: ubuntu-latest
    permissions:
      contents: write
      packages: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Set lowercase repo name
        id: repo
        run: echo "name=${GITHUB_REPOSITORY,,}" >> $GITHUB_OUTPUT

      - name: Set up Java
        uses: actions/setup-java@v4
        with:
          distribution: 'temurin'
          java-version: '25'
          cache: 'maven'

      - name: Increment version in pom.xml
        id: version
        working-directory: ./server
        run: |
          # Extract current version from pom.xml
          CURRENT_VERSION=$(./mvnw help:evaluate -Dexpression=project.version -q -DforceStdout)
          echo "Current version: ${CURRENT_VERSION}"

          # Increment version
          NEW_VERSION=$((CURRENT_VERSION + 1))
          echo "New version: ${NEW_VERSION}"

          # Update pom.xml with new version
          ./mvnw versions:set -DnewVersion=${NEW_VERSION} -DgenerateBackupFiles=false -q

          # Output for later steps
          echo "version=${NEW_VERSION}" >> $GITHUB_OUTPUT

      - name: Commit version bump
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add server/pom.xml
          git commit -m "chore: bump api version to ${{ steps.version.outputs.version }} [skip ci]"
          git push

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Find PR number
        id: find_pr
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_NUMBER=$(gh pr list --search "${{ github.sha }}" --state merged --json number --jq '.[0].number')
          if [ -z "$PR_NUMBER" ]; then
            echo "No merged PR found for this commit. Falling back to 'candidate' tag."
            PR_NUMBER="candidate"
          else
            PR_NUMBER="pr-${PR_NUMBER}"
          fi
          echo "tag=${PR_NUMBER}" >> $GITHUB_OUTPUT

      - name: Promote Docker image
        run: |
          docker buildx imagetools create \
            --tag ghcr.io/${{ steps.repo.outputs.name }}/api:latest \
            --tag ghcr.io/${{ steps.repo.outputs.name }}/api:${{ steps.version.outputs.version }} \
            ghcr.io/${{ steps.repo.outputs.name }}/api:${{ steps.find_pr.outputs.tag }}

      - name: Create and push Git tag
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag -a api-v${{ steps.version.outputs.version }} -m "Release API v${{ steps.version.outputs.version }}"
          git push origin api-v${{ steps.version.outputs.version }}