name: Docker Build and Push

on:
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:

jobs:
  detect-changes:
    runs-on: ubuntu-latest
    outputs:
      proxy: ${{ steps.set.outputs.proxy }}
      frontend: ${{ steps.set.outputs.frontend }}
      backend: ${{ steps.set.outputs.backend }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 2

      - name: Detect file changes
        id: set
        run: |
          git fetch origin main
          FILES=$(git diff --name-only origin/main...HEAD || true)
          echo "$FILES"

          echo "proxy=false" >> $GITHUB_OUTPUT
          echo "frontend=false" >> $GITHUB_OUTPUT
          echo "backend=false" >> $GITHUB_OUTPUT

          echo "$FILES" | grep -q '^proxy/' && echo "proxy=true" >> $GITHUB_OUTPUT
          echo "$FILES" | grep -q '^frontend/' && echo "frontend=true" >> $GITHUB_OUTPUT
          echo "$FILES" | grep -q '^grpc-backend/' && echo "backend=true" >> $GITHUB_OUTPUT

  build-backend:
    needs: detect-changes
    if: needs.detect-changes.outputs.backend == 'true' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          submodules: recursive
          fetch-depth: 0

      - name: Install Protobuf
        run: |
          curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v21.12/protoc-21.12-linux-x86_64.zip
          unzip protoc-21.12-linux-x86_64.zip -d protoc3
          sudo mv protoc3/bin/* /usr/local/bin/
          sudo mv protoc3/include/* /usr/local/include/
          rm -rf protoc*

      - name: Install protoc-gen plugins
        run: |
          go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
          go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway@latest
          go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2@latest
          echo "$(go env GOPATH)/bin" >> $GITHUB_PATH

      - name: Generate protobuf code
        run: |
          protoc \
            -I grpc-backend/proto \
            -I grpc-backend/googleapis \
            --go_out=grpc-backend/gen --go_opt=paths=source_relative \
            --go-grpc_out=grpc-backend/gen --go-grpc_opt=paths=source_relative \
            --grpc-gateway_out=grpc-backend/gen --grpc-gateway_opt=paths=source_relative \
            --openapiv2_out=grpc-backend/gen/swagger \
            grpc-backend/proto/osu_music.proto

      - name: Build osu-server binary
        working-directory: grpc-backend
        run: go build -o osu-server .

      - name: Upload osu-server binary artifact
        uses: actions/upload-artifact@v4
        with:
          name: osu-server
          path: grpc-backend/osu-server

  build-proxy:
    needs: detect-changes
    if: needs.detect-changes.outputs.proxy == 'true' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Download osu-server binary
        uses: actions/download-artifact@v4
        with:
          name: osu-server
          path: grpc-backend

      - name: Build Proxy Docker image
        run: |
          docker build -t juli0n21/proxy-container:latest -t juli0n21/proxy-container:${{ github.sha }} ./proxy

      - name: Log in to Docker Hub
        env:
          DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}
          DOCKER_HUB_TOKEN: ${{ secrets.DOCKER_HUB_TOKEN }}
        run: echo "${DOCKER_HUB_TOKEN}" | docker login -u "${DOCKER_HUB_USERNAME}" --password-stdin

      - name: Push Proxy Docker image
        run: |
          docker push juli0n21/proxy-container:${{ github.sha }}
          docker push juli0n21/proxy-container:latest

  build-frontend:
    needs: detect-changes
    if: needs.detect-changes.outputs.frontend == 'true' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Download osu-server binary
        uses: actions/download-artifact@v4
        with:
          name: osu-server
          path: grpc-backend

      - name: Build Frontend Docker image
        run: |
          docker build -t juli0n21/frontend-container:latest -t juli0n21/frontend-container:${{ github.sha }} ./frontend

      - name: Log in to Docker Hub
        env:
          DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}
          DOCKER_HUB_TOKEN: ${{ secrets.DOCKER_HUB_TOKEN }}
        run: echo "${DOCKER_HUB_TOKEN}" | docker login -u "${DOCKER_HUB_USERNAME}" --password-stdin

      - name: Push Frontend Docker image
        run: |
          docker push juli0n21/frontend-container:${{ github.sha }}
          docker push juli0n21/frontend-container:latest