name: Build Slideshow App

on:
  push:
    tags:
      - '*'

env:
  APP_NAME: slideshowApp

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        include:
          - os: windows
            arch: amd64
            ext: .exe
          - os: linux
            arch: amd64
            ext: ""
          - os: linux
            arch: arm64
            ext: ""
          - os: linux
            arch: arm
            arm_version: 7
            ext: ""

    steps:

      - name: Checkout repo
        uses: actions/checkout@v3

      - name: Ensure latest Go is installed in /data/go
        run: |
          export GOROOT=/data/go/go
          export PATH=$GOROOT/bin:$PATH
          export GOCACHE=/data/gocache
          export GOMODCACHE=/data/gomodcache
          mkdir -p $GOCACHE $GOMODCACHE

          if [ ! -x "$GOROOT/bin/go" ]; then
            echo "Go not found in $GOROOT, downloading latest stable..."
            
            GO_VERSION=$(curl -s https://go.dev/VERSION?m=text | head -n1)
            echo "Latest version is $GO_VERSION"

            mkdir -p /data/go
            curl -sSL "https://go.dev/dl/${GO_VERSION}.linux-amd64.tar.gz" -o /tmp/go.tar.gz
            tar -C /data/go -xzf /tmp/go.tar.gz
          else
            echo "Using cached Go from $GOROOT"
          fi

          go version

      - name: Download Go dependencies
        run: |
          export GOROOT=/data/go/go
          export PATH=$GOROOT/bin:$PATH
          export GOCACHE=/data/gocache
          export GOMODCACHE=/data/gomodcache
          mkdir -p $GOCACHE $GOMODCACHE
          go mod download

      - name: Build binary
        run: |
          export GOROOT=/data/go/go
          export PATH=$GOROOT/bin:$PATH
          export GOCACHE=/data/gocache
          export GOMODCACHE=/data/gomodcache
          mkdir -p $GOCACHE $GOMODCACHE

          OUTPUT="${APP_NAME}"
          if [ -n "${{ matrix.arm_version }}" ]; then
            export GOARM=${{ matrix.arm_version }}
          fi

          OUTPUT="${OUTPUT}${{ matrix.ext }}"
          echo "Building $OUTPUT"
          GOOS=${{ matrix.os }} GOARCH=${{ matrix.arch }} go build -ldflags="-s -w" -trimpath -o "$OUTPUT"
        shell: bash

      - name: Create Debian Package
        if: matrix.os == 'linux'
        run: |
          # 1. Setup Variables
          VERSION=${GITHUB_REF_NAME#v} # Extracts 1.0.0 from v1.0.0
          ARCH=${{ matrix.arch }}
          if [ "$ARCH" == "arm" ]; then ARCH="armhf"; fi
          
          PKG_NAME="slideshowapp"
          BUILD_DIR="${PKG_NAME}_${VERSION}_${ARCH}"
          
          # 2. Create Directory Structure
          mkdir -p $BUILD_DIR/usr/bin
          mkdir -p $BUILD_DIR/usr/share/$PKG_NAME
          mkdir -p $BUILD_DIR/etc/systemd/system
          mkdir -p $BUILD_DIR/DEBIAN

          # 3. Copy Files
          cp ${APP_NAME} $BUILD_DIR/usr/bin/$PKG_NAME
          cp -r ./web $BUILD_DIR/usr/share/$PKG_NAME/
          chmod +x $BUILD_DIR/usr/bin/$PKG_NAME

          # 4. Handle .env (Copy as a .template so it doesn't overwrite existing ones)
          if [ -f ".env" ]; then
            cp .env $BUILD_DIR/usr/share/$PKG_NAME/.env.template
          else
            echo "PORT=8080" > $BUILD_DIR/usr/share/$PKG_NAME/.env.template
          fi

          # 5. Create the systemd Service File
          cat <<EOF > $BUILD_DIR/etc/systemd/system/$PKG_NAME.service
          [Unit]
          Description=Slideshow Application Service
          After=graphical.target

          [Service]
          Type=simple
          Environment=DISPLAY=:0
          Environment=XAUTHORITY=/home/youruser/.Xauthority
          ExecStart=/usr/bin/$PKG_NAME
          WorkingDirectory=/usr/share/$PKG_NAME
          Restart=always
          User=root

          [Install]
          WantedBy=multi-user.target
          EOF
          
          # 6. Create Control File
          cat <<EOF > $BUILD_DIR/DEBIAN/control
          Package: $PKG_NAME
          Version: $VERSION
          Section: utils
          Priority: optional
          Architecture: $ARCH
          Maintainer: Your Name <you@example.com>
          Description: Slideshow Application
          EOF

          # 7. Optional: Add post-install script to enable service automatically
          echo "create service"
          cat <<EOF > $BUILD_DIR/DEBIAN/postinst
          #!/bin/sh
          # Check if .env exists in the target share folder
          if [ ! -f "/usr/share/$PKG_NAME/.env" ]; then
              echo "Creating new .env from template..."
              cp /usr/share/$PKG_NAME/.env.template /usr/share/$PKG_NAME/.env
          else
              echo ".env already exists, skipping template copy to preserve settings."
          fi

          echo "reload"
          systemctl daemon-reload
          echo "enable service"
          systemctl enable $PKG_NAME.service
          echo "start service"
          systemctl start $PKG_NAME.service
          EOF
          chmod 555 $BUILD_DIR/DEBIAN/postinst

          # 8. Build .deb
          dpkg-deb --build $BUILD_DIR
        shell: bash

      # Upload for Windows (Binary + Web folder)
      - name: Upload Windows Artifact
        if: matrix.os == 'windows'
        uses: actions/upload-artifact@v3
        with:
          name: ${{ env.APP_NAME }}-windows
          path: |
            ${{ env.APP_NAME }}.exe
            ./web

      # Upload for Linux (Binary + .deb)
      - name: Upload Linux Artifact
        if: matrix.os == 'linux'
        uses: actions/upload-artifact@v3
        with:
          name: ${{ env.APP_NAME }}-linux-${{ matrix.arch }}
          path: |
            ${{ env.APP_NAME }}
            *.deb