name: Build & Push Docker Images

on:
  push:
    branches: ["main", "master"]
    tags: ["v*.*.*"]
  pull_request:
    branches: ["main", "master"]

env:
  BACKEND_IMAGE: imap-client-backend
  FRONTEND_IMAGE: imap-client-frontend
  # Uses local Gitea registry: <gitea-host>/<namespace>/<image>:tag

jobs:
  build:
    runs-on: docker
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Prepare tags
        id: meta
        run: |
          SHA_TAG=sha-${GITHUB_SHA::7}
          echo "sha_tag=$SHA_TAG" >> $GITHUB_OUTPUT
          if [[ "$GITHUB_REF" == refs/heads/main || "$GITHUB_REF" == refs/heads/master ]]; then
            echo "latest_tag=latest" >> $GITHUB_OUTPUT
          fi
          if [[ "$GITHUB_REF" == refs/tags/v* ]]; then
            VERSION_TAG=${GITHUB_REF#refs/tags/}
            echo "version_tag=$VERSION_TAG" >> $GITHUB_OUTPUT
          fi

      - name: Derive registry host / namespace
        id: reg
        run: |
          REGISTRY_HOST="${GITEA_SERVER_URL}"
          REGISTRY_HOST="${REGISTRY_HOST#https://}"
          REGISTRY_HOST="${REGISTRY_HOST#http://}"
          REGISTRY_HOST="${REGISTRY_HOST%%/*}"
          NAMESPACE="${GITHUB_REPOSITORY%/*}"
          echo "host=$REGISTRY_HOST" >> $GITHUB_OUTPUT
          echo "ns=$NAMESPACE" >> $GITHUB_OUTPUT
          echo "Using registry: $REGISTRY_HOST  namespace: $NAMESPACE"

      - name: Login to local Gitea registry
        run: |
          echo "${{ secrets.CR_PASSWORD }}" | docker login "${{ steps.reg.outputs.host }}" -u "${{ secrets.CR_USERNAME }}" --password-stdin

      - name: Build backend
        run: |
          docker build -t ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${BACKEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ./backend
          if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker tag ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${BACKEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${BACKEND_IMAGE}:latest; fi
          if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker tag ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${BACKEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${BACKEND_IMAGE}:${{ steps.meta.outputs.version_tag }}; fi

      - name: Build frontend
        run: |
          docker build -t ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${FRONTEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ./frontend
          if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker tag ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${FRONTEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${FRONTEND_IMAGE}:latest; fi
          if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker tag ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${FRONTEND_IMAGE}:${{ steps.meta.outputs.sha_tag }} ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${FRONTEND_IMAGE}:${{ steps.meta.outputs.version_tag }}; fi

      - name: Push images
        if: github.event_name != 'pull_request'
        run: |
          for IMG in ${BACKEND_IMAGE} ${FRONTEND_IMAGE}; do
            docker push ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${IMG}:${{ steps.meta.outputs.sha_tag }}
            if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker push ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${IMG}:latest; fi
            if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker push ${{ steps.reg.outputs.host }}/${{ steps.reg.outputs.ns }}/${IMG}:${{ steps.meta.outputs.version_tag }}; fi
          done