param(
    [Parameter(Position=0)]
    [string]$Command = 'build'
)

$ErrorActionPreference = "Stop"

# 验证命令
$validCommands = @('build', 'dev', 'dev-all', 'init', 'help')
if ($Command -and $Command -ne '' -and $validCommands -notcontains $Command) {
    Write-Host ""
    Write-Host "❌ 未知命令: $Command" -ForegroundColor Red
    Write-Host ""
    Write-Host "有效命令: build, dev, dev-all, init, help" -ForegroundColor Yellow
    Write-Host "使用 '.\build.ps1 help' 查看详细帮助" -ForegroundColor Yellow
    Write-Host ""
    exit 1
}

#region 帮助函数

function Show-Help {
    Write-Host ""
    Write-Host "Dpz.Core.Web 构建工具" -ForegroundColor Cyan
    Write-Host "===================" -ForegroundColor Cyan
    Write-Host ""
    Write-Host "用法:" -ForegroundColor Yellow
    Write-Host "  .\build.ps1 [command]" -ForegroundColor White
    Write-Host ""
    Write-Host "命令:" -ForegroundColor Yellow
    Write-Host "  build      生产构建（压缩、哈希、生成清单）[默认]" -ForegroundColor White
    Write-Host "  dev        启动主应用 watch 模式（开发环境实时编译）" -ForegroundColor White
    Write-Host "  dev-all    启动主应用 watch 模式（兼容旧命令）" -ForegroundColor White
    Write-Host "  init       初始化环境（安装依赖，验证配置）" -ForegroundColor White
    Write-Host "  help       显示此帮助信息" -ForegroundColor White
    Write-Host ""
    Write-Host "示例:" -ForegroundColor Yellow
    Write-Host "  .\build.ps1             # 生产构建" -ForegroundColor Gray
    Write-Host "  .\build.ps1 build       # 生产构建" -ForegroundColor Gray
    Write-Host "  .\build.ps1 dev         # 开发 watch" -ForegroundColor Gray
    Write-Host "  .\build.ps1 init        # 初始化环境" -ForegroundColor Gray
    Write-Host ""
    Write-Host "前端技术栈:" -ForegroundColor Yellow
    Write-Host "  - TypeScript (可选，支持 JS/TS 混用)" -ForegroundColor Gray
    Write-Host "  - esbuild（超快速打包，< 50ms）" -ForegroundColor Gray
    Write-Host "  - clean-css（CSS 压缩）" -ForegroundColor Gray
    Write-Host ""
}

function Write-Step {
    param([string]$Message)
    Write-Host ""
    Write-Host "--------------------------------" -ForegroundColor Yellow
    Write-Host $Message -ForegroundColor Yellow
    Write-Host "--------------------------------" -ForegroundColor Yellow
}

function Write-Success {
    param([string]$Message)
    Write-Host "✅ $Message" -ForegroundColor Green
}

function Write-Info {
    param([string]$Message)
    Write-Host "ℹ️  $Message" -ForegroundColor Cyan
}

function Get-LocalCleanCssPath {
    $binDirectory = [System.IO.Path]::Combine((Get-Location).Path, "node_modules", ".bin")
    $commandPath = [System.IO.Path]::Combine($binDirectory, "cleancss.cmd")

    if (-not [System.IO.File]::Exists($commandPath)) {
        $commandPath = [System.IO.Path]::Combine($binDirectory, "cleancss")
    }

    if (-not [System.IO.File]::Exists($commandPath)) {
        Write-Host "❌ 未找到本地 clean-css-cli，请先运行 npm install" -ForegroundColor Red
        exit 1
    }

    return $commandPath
}

#endregion

#region 初始化环境

function Initialize-Environment {
    Write-Host ""
    Write-Host "========================================" -ForegroundColor Cyan
    Write-Host "初始化 TypeScript 开发环境" -ForegroundColor Cyan
    Write-Host "========================================" -ForegroundColor Cyan
    
    Write-Step "步骤 1/3: 检查并安装依赖"
    
    # 安装项目依赖
    Write-Info "安装项目依赖..."
    if (Test-Path "node_modules") {
        Write-Info "node_modules 已存在，更新依赖..."
    } else {
        Write-Info "首次安装依赖..."
    }
    
    npm install
    if ($LASTEXITCODE -ne 0) {
        exit $LASTEXITCODE
    }
    Write-Success "项目依赖安装完成"
    $cleanCssPath = Get-LocalCleanCssPath
    Write-Success "找到本地 clean-css-cli: $cleanCssPath"
    
    Write-Step "步骤 2/3: 验证配置文件"
    
    $configFiles = @(
        "tsconfig.json",
        "package.json"
    )
    
    foreach ($file in $configFiles) {
        if (Test-Path $file) {
            Write-Success "找到配置文件: $file"
        } else {
            Write-Host "⚠️  缺少配置文件: $file" -ForegroundColor Yellow
        }
    }
    
    Write-Step "步骤 3/3: 测试构建"
    
    Write-Info "执行一次完整构建验证配置..."
    Invoke-ProductionBuild
    
    Write-Host ""
    Write-Host "========================================" -ForegroundColor Green
    Write-Host "🎉 环境初始化完成！" -ForegroundColor Green
    Write-Host "========================================" -ForegroundColor Green
    Write-Host ""
    Write-Host "下一步：" -ForegroundColor Yellow
    Write-Host "  开发模式: .\build.ps1 dev" -ForegroundColor White
    Write-Host "  生产构建: .\build.ps1 build" -ForegroundColor White
    Write-Host ""
}

#endregion

#region 开发模式

function Start-DevWatch {
    param([bool]$AllModules = $false)
    
    Write-Host ""
    Write-Host "========================================" -ForegroundColor Cyan
    Write-Host "🚀 启动主应用 Watch 模式" -ForegroundColor Cyan
    Write-Host "========================================" -ForegroundColor Cyan
    Write-Host ""
    Write-Info "监听文件变化，自动编译 TypeScript/JavaScript"
    Write-Info "修改代码后浏览器刷新即可看到效果"
    Write-Host ""
    Write-Host "按 Ctrl+C 停止" -ForegroundColor Yellow
    Write-Host ""
    
    # 检查依赖
    if (-not (Test-Path "node_modules")) {
        Write-Host "⚠️  未发现 node_modules，正在安装依赖..." -ForegroundColor Yellow
        npm install
        if ($LASTEXITCODE -ne 0) {
            exit $LASTEXITCODE
        }
        Write-Host ""
    }
    
    if ($AllModules) {
        Write-Info "dev-all 已保留为兼容命令，当前只启动主应用 watch"
    }
    
    # 启动 watch
    Write-Success "开始监听..."
    npm run dev:app
    if ($LASTEXITCODE -ne 0) {
        exit $LASTEXITCODE
    }
}

#endregion

#region 生产构建

function Invoke-ProductionBuild {
    npm run build
    if ($LASTEXITCODE -ne 0) {
        exit $LASTEXITCODE
    }
}

#endregion

#region 主程序

# 处理空参数
if ([string]::IsNullOrWhiteSpace($Command)) {
    $Command = 'build'
}

switch ($Command) {
    'help' {
        Show-Help
    }
    'init' {
        Initialize-Environment
    }
    'dev' {
        Start-DevWatch -AllModules $false
    }
    'dev-all' {
        Start-DevWatch -AllModules $true
    }
    'build' {
        Invoke-ProductionBuild
    }
}

#endregion