# .github/workflows/build.yml
# 构建并推送 Docker 镜像到 GitHub Container Registry
#
# 触发条件:
#   - push 到 main 分支
#   - 手动触发 (workflow_dispatch)
#   - 创建版本标签 (v*)
#
# 镜像命名:
#   ghcr.io/<owner>/dreamweaver-backend:latest
#   ghcr.io/<owner>/dreamweaver-frontend:latest
#   ghcr.io/<owner>/dreamweaver-admin-frontend:latest

name: Build and Push Docker Images

on:
  push:
    branches: [main]
    tags: ['v*']
    paths:
      - 'backend/**'
      - 'frontend/**'
      - 'admin-frontend/**'
      - '.github/workflows/build.yml'
  workflow_dispatch:
    inputs:
      force_build:
        description: 'Force rebuild all images'
        required: false
        default: 'false'

env:
  REGISTRY: ghcr.io
  IMAGE_PREFIX: ${{ github.repository_owner }}/dreamweaver

jobs:
  # ==============================================
  # 检测变更的目录
  # ==============================================
  changes:
    runs-on: ubuntu-latest
    outputs:
      backend: ${{ steps.filter.outputs.backend }}
      frontend: ${{ steps.filter.outputs.frontend }}
      admin-frontend: ${{ steps.filter.outputs.admin-frontend }}
    steps:
      - uses: actions/checkout@v4
      - uses: dorny/paths-filter@v3
        id: filter
        with:
          filters: |
            backend:
              - 'backend/**'
            frontend:
              - 'frontend/**'
            admin-frontend:
              - 'admin-frontend/**'

  # ==============================================
  # 构建后端镜像
  # ==============================================
  build-backend:
    needs: changes
    if: needs.changes.outputs.backend == 'true' || github.event.inputs.force_build == 'true' || startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

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

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-backend
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=sha,prefix=
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: ./backend
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  # ==============================================
  # 构建前端镜像
  # ==============================================
  build-frontend:
    needs: changes
    if: needs.changes.outputs.frontend == 'true' || github.event.inputs.force_build == 'true' || startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

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

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-frontend
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=sha,prefix=
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: ./frontend
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  # ==============================================
  # 构建管理后台前端镜像
  # ==============================================
  build-admin-frontend:
    needs: changes
    if: needs.changes.outputs.admin-frontend == 'true' || github.event.inputs.force_build == 'true' || startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

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

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}-admin-frontend
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=sha,prefix=
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: ./admin-frontend
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max