name: CI Cross-Compile

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

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        goos: [linux, windows, darwin]
        goarch: [amd64]

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

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version: '1.22.x'

      - name: Cache Go build/mod
        uses: actions/cache@v4
        with:
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}-${{ matrix.goos }}-${{ matrix.goarch }}
          restore-keys: |
            ${{ runner.os }}-go-

      - name: Download deps
        run: go mod download

      - name: Cross-compile (${{ matrix.goos }}/${{ matrix.goarch }})
        env:
          CGO_ENABLED: "0"               # 关闭 cgo，便于纯交叉构建
          GOOS: ${{ matrix.goos }}
          GOARCH: ${{ matrix.goarch }}
        run: |
          mkdir -p dist/${GOOS}-${GOARCH}
          OUT="dist/${GOOS}-${GOARCH}/app"
          if [ "${GOOS}" = "windows" ]; then OUT="${OUT}.exe"; fi
          # -trimpath/-ldflags 让产物更小更可复现；按你的入口调整 ./cmd/app
          go build -trimpath -ldflags="-s -w" -o "${OUT}" ./cmd/app
          echo "Built ${OUT}"

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: app-${{ matrix.goos }}-${{ matrix.goarch }}
          path: dist/${{ matrix.goos }}-${{ matrix.goarch }}/*
          if-no-files-found: error