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
  DOCKER_BUILDKIT: "1"
  # Uses local Gitea registry: <gitea-host>/<namespace>/<image>:tag

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

      - name: Derive repository context
        id: repo
        shell: bash
        run: |
          set -euo pipefail
          RAW_REPO="${GITHUB_REPOSITORY:-${GITEA_REPOSITORY:-}}"
          if [ -z "$RAW_REPO" ]; then echo "Missing GITHUB_REPOSITORY/GITEA_REPOSITORY"; exit 1; fi
          OWNER="${RAW_REPO%%/*}"; REPO="${RAW_REPO#*/}"
          REG_HOST_RAW="${GITEA_SERVER_URL:-${GITHUB_SERVER_URL:-}}"
          if [ -z "$REG_HOST_RAW" ]; then echo "Missing GITEA_SERVER_URL/GITHUB_SERVER_URL"; exit 1; fi
          REG_HOST="${REG_HOST_RAW#http://}"; REG_HOST="${REG_HOST#https://}"; REG_HOST="${REG_HOST%%/*}"
          # Override if needed (set secret/env to git.thumeit.com[:port])
          OVERRIDE="${{ secrets.GITEA_REGISTRY_HOST }}"
          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${GITEA_REGISTRY_HOST:-}"
          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${{ secrets.REGISTRY_HOST }}"
          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${REGISTRY_HOST:-}"
          if [ "$REG_HOST" = "gitea" ] && [ -n "${OVERRIDE:-}" ]; then REG_HOST="$OVERRIDE"; fi
          echo "owner=tfaour" >> $GITHUB_OUTPUT
          echo "repo=imap_client" >> $GITHUB_OUTPUT
          echo "host=git.thumeit.com" >> $GITHUB_OUTPUT
          echo "Derived -> host=$REG_HOST owner=$OWNER repo=$REPO"

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

      - name: Show build plan
        run: |
          echo "Registry host: ${{ steps.repo.outputs.host }}"
          echo "Namespace: ${{ steps.repo.outputs.owner }}"
          echo "Backend image: ${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${BACKEND_IMAGE}"
          echo "Frontend image: ${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${FRONTEND_IMAGE}"

      - name: Login (optional)
        id: login
        shell: bash
        run: |
          set -euo pipefail
          HOST="${{ steps.repo.outputs.host }}"
          if [ -n "${{ secrets.CR_USERNAME }}" ] && [ -n "${{ secrets.CR_PASSWORD }}" ]; then
            echo "${{ secrets.CR_PASSWORD }}" | docker login "git.thumeit.com" -u "${{ secrets.CR_USERNAME }}" --password-stdin
            echo "authenticated=1" >> $GITHUB_OUTPUT; exit 0
          fi
          if [ -n "${{ secrets.GITEA_REGISTRY_TOKEN }}" ]; then
            ACTOR="${GITHUB_ACTOR:-${GITEA_ACTOR:-${{ steps.repo.outputs.owner }}}}"
            echo "${{ secrets.GITEA_REGISTRY_TOKEN }}" | docker login "$HOST" -u "$ACTOR" --password-stdin
            echo "authenticated=1" >> $GITHUB_OUTPUT; exit 0
          fi
          echo "No credentials; push will be skipped."
          echo "authenticated=0" >> $GITHUB_OUTPUT

      - name: Docker build (backend)
        id: build_backend
        shell: bash
        run: |
          set -euo pipefail
          BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${BACKEND_IMAGE}"
          docker build --progress=plain -t ${BASE}:${{ steps.meta.outputs.sha_tag }} ./backend
          if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:latest; fi
          if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:${{ steps.meta.outputs.version_tag }}; fi

      - name: Docker build (frontend)
        id: build_frontend
        shell: bash
        run: |
          set -euo pipefail
          BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${FRONTEND_IMAGE}"
          docker build --progress=plain -t ${BASE}:${{ steps.meta.outputs.sha_tag }} ./frontend
          if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:latest; fi
          if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:${{ steps.meta.outputs.version_tag }}; fi

      - name: Docker push (both images)
        id: push_images
        if: github.event_name != 'pull_request' && steps.login.outputs.authenticated == '1'
        shell: bash
        run: |
          set -euo pipefail
          for IMG in ${BACKEND_IMAGE} ${FRONTEND_IMAGE}; do
            BASE="git.thumeit.com/${{ steps.repo.outputs.owner }}/${IMG}"
            docker push ${BASE}:${{ steps.meta.outputs.sha_tag }}
            [ -n "${{ steps.meta.outputs.latest_tag }}" ] && docker push ${BASE}:latest || true
            [ -n "${{ steps.meta.outputs.version_tag }}" ] && docker push ${BASE}:${{ steps.meta.outputs.version_tag }} || true
          done

      - name: Summary
        if: always()
        run: |
          echo "Build backend: ${{ steps.build_backend.outcome }}"
          echo "Build frontend: ${{ steps.build_frontend.outcome }}"
          echo "Login: ${{ steps.login.outcome }} (auth=${{ steps.login.outputs.authenticated }})"
          echo "Push images: ${{ steps.push_images.outcome || 'skipped' }}"