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: Derive repository context
        id: repo
        shell: bash
        run: |
          set -e
          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="${REG_HOST%%/*}"
          # Allow explicit override via secrets or env
          OVERRIDE="${{ 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
            echo "Replacing unresolved host 'gitea' with override '$OVERRIDE'"
            REG_HOST="$OVERRIDE"
          fi
          if [ "$REG_HOST" = "gitea" ]; then
            REG_HOST="git.thumeit.com"; 
          fi
          echo "owner=$OWNER" >> $GITHUB_OUTPUT
          echo "repo=$REPO" >> $GITHUB_OUTPUT
          echo "host=$REG_HOST" >> $GITHUB_OUTPUT
          echo "Derived -> host=$REG_HOST owner=$OWNER repo=$REPO"

      - 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|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: Show build plan
        run: |
          echo "Registry host: ${{ steps.repo.outputs.host }}"
          echo "Namespace: ${{ steps.repo.outputs.owner }}"
          echo "Images: ${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${BACKEND_IMAGE} and frontend"

      - name: Login (optional)
        id: login
        run: |
          set -e
          HOST="${{ steps.repo.outputs.host }}"
          if [ -n "${{ secrets.CR_USERNAME }}" ] && [ -n "${{ secrets.CR_PASSWORD }}" ]; then
            echo "${{ secrets.CR_PASSWORD }}" | docker login "$HOST" -u "${{ 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:-$OWNER}}"
            echo "${{ secrets.GITEA_REGISTRY_TOKEN }}" | docker login "$HOST" -u "$ACTOR" --password-stdin
            echo "authenticated=1" >> $GITHUB_OUTPUT; exit 0
          fi
          echo "No credentials; will skip push."; echo "authenticated=0" >> $GITHUB_OUTPUT

      - name: Build backend
        run: |
          BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${BACKEND_IMAGE}"
          docker build -t ${BASE}:${{ steps.meta.outputs.sha_tag }} ./backend
          [ -n "${{ steps.meta.outputs.latest_tag }}" ] && docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:latest
          [ -n "${{ steps.meta.outputs.version_tag }}" ] && docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:${{ steps.meta.outputs.version_tag }}

      - name: Build frontend
        run: |
          BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${FRONTEND_IMAGE}"
          docker build -t ${BASE}:${{ steps.meta.outputs.sha_tag }} ./frontend
          [ -n "${{ steps.meta.outputs.latest_tag }}" ] && docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:latest
          [ -n "${{ steps.meta.outputs.version_tag }}" ] && docker tag ${BASE}:${{ steps.meta.outputs.sha_tag }} ${BASE}:${{ steps.meta.outputs.version_tag }}

      - name: Push images
        if: github.event_name != 'pull_request'
        run: |
          if [ "${{ steps.login.outputs.authenticated }}" != "1" ]; then
            echo "Skipping push (unauthenticated)"; exit 0; fi
          for IMG in ${BACKEND_IMAGE} ${FRONTEND_IMAGE}; do
            BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${IMG}"
            docker push ${BASE}:${{ steps.meta.outputs.sha_tag }}
            [ -n "${{ steps.meta.outputs.latest_tag }}" ] && docker push ${BASE}:latest
            [ -n "${{ steps.meta.outputs.version_tag }}" ] && docker push ${BASE}:${{ steps.meta.outputs.version_tag }}
          done
          BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${FRONTEND_IMAGE}"
          docker build -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: Push images
        if: github.event_name != 'pull_request'
        run: |
          if [ "${{ steps.login.outputs.authenticated }}" != "1" ]; then
            echo "Skipping push attempt (not authenticated). Provide CR_USERNAME/CR_PASSWORD or GITEA_REGISTRY_TOKEN to enable."
            exit 0
          fi
          for IMG in ${BACKEND_IMAGE} ${FRONTEND_IMAGE}; do
            BASE="${{ steps.repo.outputs.host }}/${{ steps.repo.outputs.owner }}/${IMG}"
            docker push ${BASE}:${{ steps.meta.outputs.sha_tag }}
            if [ -n "${{ steps.meta.outputs.latest_tag }}" ]; then docker push ${BASE}:latest; fi
            if [ -n "${{ steps.meta.outputs.version_tag }}" ]; then docker push ${BASE}:${{ steps.meta.outputs.version_tag }}; fi
          done