name: Docker Publish

on:
  push:
    branches:
      - main
  workflow_dispatch:

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io

jobs:
  detect-changes:
    runs-on: ubuntu-latest
    outputs:
      shared: ${{ steps.manual.outputs.shared || steps.filter.outputs.shared }}
      frontend: ${{ steps.manual.outputs.frontend || steps.filter.outputs.frontend }}
      backend: ${{ steps.manual.outputs.backend || steps.filter.outputs.backend }}
      remote_gateway: ${{ steps.manual.outputs.remote_gateway || steps.filter.outputs.remote_gateway }}
      matrix: ${{ steps.matrix.outputs.matrix }}
      has_changes: ${{ steps.matrix.outputs.has_changes }}

    steps:
      - name: Checkout repository
        if: github.event_name != 'workflow_dispatch'
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Mark all services changed for manual dispatch
        if: github.event_name == 'workflow_dispatch'
        id: manual
        run: |
          echo "shared=true" >> "$GITHUB_OUTPUT"
          echo "frontend=true" >> "$GITHUB_OUTPUT"
          echo "backend=true" >> "$GITHUB_OUTPUT"
          echo "remote_gateway=true" >> "$GITHUB_OUTPUT"

      - name: Detect changed paths
        if: github.event_name != 'workflow_dispatch'
        id: filter
        uses: dorny/paths-filter@v3
        with:
          filters: |
            shared:
              - '.github/workflows/docker-publish.yml'
              - 'package.json'
              - 'package-lock.json'
              - 'docker-compose.yml'
              - 'patches/**'
            frontend:
              - 'packages/frontend/**'
            backend:
              - 'packages/backend/**'
            remote_gateway:
              - 'packages/remote-gateway/**'

      - name: Build service matrix
        id: matrix
        env:
          SHARED: ${{ steps.manual.outputs.shared || steps.filter.outputs.shared }}
          FRONTEND: ${{ steps.manual.outputs.frontend || steps.filter.outputs.frontend }}
          BACKEND: ${{ steps.manual.outputs.backend || steps.filter.outputs.backend }}
          REMOTE_GATEWAY: ${{ steps.manual.outputs.remote_gateway || steps.filter.outputs.remote_gateway }}
        run: |
          python <<'PY'
          import json
          import os
          from pathlib import Path

          shared = os.environ.get("SHARED") == "true"
          services = [
              ("frontend", "packages/frontend/Dockerfile", os.environ.get("FRONTEND") == "true"),
              ("backend", "packages/backend/Dockerfile", os.environ.get("BACKEND") == "true"),
              ("remote-gateway", "packages/remote-gateway/Dockerfile", os.environ.get("REMOTE_GATEWAY") == "true"),
          ]

          include = [
              {"service": service, "dockerfile": dockerfile}
              for service, dockerfile, changed in services
              if shared or changed
          ]

          output_path = Path(os.environ["GITHUB_OUTPUT"])
          with output_path.open("a", encoding="utf-8") as output:
              output.write(f"matrix={json.dumps({'include': include})}\n")
              output.write(f"has_changes={'true' if include else 'false'}\n")
          PY

  publish:
    needs: detect-changes
    if: needs.detect-changes.outputs.has_changes == 'true'
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.detect-changes.outputs.matrix) }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

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

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

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/nexus-terminal-${{ matrix.service }}
          tags: |
            type=raw,value=latest
            type=sha,format=short,prefix=sha-

      - name: Build and push ${{ matrix.service }}
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ${{ matrix.dockerfile }}
          platforms: linux/amd64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max,scope=${{ matrix.service }}