# Node.js 服务管理脚本 - 宁夏智慧养殖监管平台后端 (Windows版本)
# 使用方法: .\node_manager.ps1 [start|stop|restart|status]

param(
    [Parameter(Mandatory=$false)]
    [ValidateSet('start','stop','restart','status','logs')]
    [string]$Action = 'status'
)

# 配置区域
$APP_NAME = "nxxmdata-backend"
$ENTRY_FILE = "server.js"
$APP_PORT = 5350
$LOG_DIR = "logs"
$LOG_FILE = Join-Path $LOG_DIR "$APP_NAME.log"
$PID_FILE = "pid.$APP_NAME"
$NODE_ENV = "production"

# 创建日志目录
if (-not (Test-Path $LOG_DIR)) {
    New-Item -ItemType Directory -Path $LOG_DIR | Out-Null
    Write-Host "已创建日志目录: $LOG_DIR" -ForegroundColor Green
}

# 检查 Node.js 是否安装
try {
    $nodeVersion = node --version
    Write-Host "Node.js 版本: $nodeVersion" -ForegroundColor Green
} catch {
    Write-Host "错误: Node.js 未安装或不在 PATH 中" -ForegroundColor Red
    exit 1
}

# 检查入口文件是否存在
if (-not (Test-Path $ENTRY_FILE)) {
    Write-Host "错误: 入口文件 $ENTRY_FILE 不存在" -ForegroundColor Red
    exit 1
}

# 停止服务函数
function Stop-App {
    Write-Host "正在停止服务: $APP_NAME" -ForegroundColor Yellow
    
    # 查找占用端口的进程
    $processes = Get-NetTCPConnection -LocalPort $APP_PORT -ErrorAction SilentlyContinue | 
                 Select-Object -ExpandProperty OwningProcess -Unique
    
    if ($processes) {
        foreach ($pid in $processes) {
            try {
                $process = Get-Process -Id $pid -ErrorAction SilentlyContinue
                if ($process -and $process.ProcessName -eq "node") {
                    Write-Host "找到进程 PID: $pid，正在停止..." -ForegroundColor Yellow
                    Stop-Process -Id $pid -Force
                    Write-Host "服务已停止 (PID: $pid)" -ForegroundColor Green
                }
            } catch {
                Write-Host "停止进程失败: $_" -ForegroundColor Red
            }
        }
        
        # 清理 PID 文件
        if (Test-Path $PID_FILE) {
            Remove-Item $PID_FILE -Force
        }
    } else {
        Write-Host "未找到运行中的服务 (端口 $APP_PORT 未被占用)" -ForegroundColor Yellow
    }
}

# 启动服务函数
function Start-App {
    Write-Host "正在启动服务: $APP_NAME" -ForegroundColor Yellow
    
    # 检查端口是否被占用
    $portCheck = Get-NetTCPConnection -LocalPort $APP_PORT -ErrorAction SilentlyContinue
    if ($portCheck) {
        $pid = $portCheck | Select-Object -First 1 -ExpandProperty OwningProcess
        Write-Host "错误: 端口 $APP_PORT 已被占用 (PID: $pid)" -ForegroundColor Red
        Write-Host "请先停止占用端口的进程或使用 restart 命令" -ForegroundColor Yellow
        return
    }
    
    # 检查 .env 文件是否存在
    if (-not (Test-Path ".env")) {
        Write-Host "警告: .env 文件不存在，将使用默认配置" -ForegroundColor Yellow
        Write-Host "建议从 env.example 复制并配置 .env 文件" -ForegroundColor Yellow
    }
    
    # 检查 node_modules 是否存在
    if (-not (Test-Path "node_modules")) {
        Write-Host "错误: node_modules 目录不存在" -ForegroundColor Red
        Write-Host "请先运行: npm install" -ForegroundColor Yellow
        return
    }
    
    # 启动 Node.js 应用
    Write-Host "启动命令: node $ENTRY_FILE" -ForegroundColor Cyan
    
    # 设置环境变量并启动
    $env:NODE_ENV = $NODE_ENV
    
    # 使用 Start-Process 启动后台进程
    $processInfo = Start-Process -FilePath "node" `
                                 -ArgumentList $ENTRY_FILE `
                                 -RedirectStandardOutput $LOG_FILE `
                                 -RedirectStandardError $LOG_FILE `
                                 -WindowStyle Hidden `
                                 -PassThru
    
    if ($processInfo) {
        $PID = $processInfo.Id
        $PID | Out-File -FilePath $PID_FILE -Encoding ASCII
        
        Write-Host "等待服务启动..." -ForegroundColor Yellow
        Start-Sleep -Seconds 3
        
        # 验证启动是否成功
        if (Get-Process -Id $PID -ErrorAction SilentlyContinue) {
            Write-Host "========================================" -ForegroundColor Green
            Write-Host "服务启动成功!" -ForegroundColor Green
            Write-Host "========================================" -ForegroundColor Green
            Write-Host "应用名称: $APP_NAME"
            Write-Host "进程 ID:  $PID"
            Write-Host "监听端口: $APP_PORT"
            Write-Host "日志文件: $LOG_FILE"
            Write-Host "PID 文件: $PID_FILE"
            Write-Host "环境变量: NODE_ENV=$NODE_ENV"
            Write-Host "API 文档: http://localhost:${APP_PORT}/api-docs" -ForegroundColor Cyan
            
            # 检查端口监听状态
            Start-Sleep -Seconds 2
            $portCheck = Get-NetTCPConnection -LocalPort $APP_PORT -ErrorAction SilentlyContinue
            if ($portCheck) {
                Write-Host "✓ 端口 $APP_PORT 正在监听" -ForegroundColor Green
            } else {
                Write-Host "⚠ 端口 $APP_PORT 尚未监听，请检查日志" -ForegroundColor Yellow
            }
            
            # 显示最近的日志
            Write-Host ""
            Write-Host "最近的启动日志:" -ForegroundColor Yellow
            Write-Host "------------------------"
            if (Test-Path $LOG_FILE) {
                Get-Content $LOG_FILE -Tail 20 -ErrorAction SilentlyContinue
            }
        } else {
            Write-Host "========================================" -ForegroundColor Red
            Write-Host "服务启动失败!" -ForegroundColor Red
            Write-Host "========================================" -ForegroundColor Red
            Write-Host "请检查日志文件: $LOG_FILE" -ForegroundColor Yellow
            
            if (Test-Path $LOG_FILE) {
                Write-Host ""
                Write-Host "最近的错误日志:" -ForegroundColor Yellow
                Write-Host "------------------------"
                Get-Content $LOG_FILE -Tail 30 -ErrorAction SilentlyContinue
            }
            
            if (Test-Path $PID_FILE) {
                Remove-Item $PID_FILE -Force
            }
            exit 1
        }
    } else {
        Write-Host "启动进程失败!" -ForegroundColor Red
        exit 1
    }
}

# 重启服务函数
function Restart-App {
    Write-Host "正在重启服务: $APP_NAME" -ForegroundColor Yellow
    Stop-App
    Start-Sleep -Seconds 2
    Start-App
}

# 状态检查函数
function Get-AppStatus {
    Write-Host "检查服务状态: $APP_NAME" -ForegroundColor Yellow
    Write-Host "========================================"
    
    # 检查端口占用
    $portCheck = Get-NetTCPConnection -LocalPort $APP_PORT -ErrorAction SilentlyContinue
    
    if ($portCheck) {
        $pid = $portCheck | Select-Object -First 1 -ExpandProperty OwningProcess
        $process = Get-Process -Id $pid -ErrorAction SilentlyContinue
        
        if ($process -and $process.ProcessName -eq "node") {
            Write-Host "✓ 服务正在运行" -ForegroundColor Green
            Write-Host "----------------------------------------"
            Write-Host "进程 ID:    $pid"
            Write-Host "进程名称:   $($process.ProcessName)"
            Write-Host "应用名称:   $APP_NAME"
            Write-Host "监听端口:   $APP_PORT"
            Write-Host "启动时间:   $($process.StartTime)"
            
            # 内存使用 (转换为 MB)
            $memoryMB = [math]::Round($process.WorkingSet64 / 1MB, 2)
            Write-Host "内存使用:   $memoryMB MB"
            
            # CPU时间
            Write-Host "CPU 时间:   $($process.CPU) 秒"
            
            # 端口状态
            Write-Host "端口状态:   监听中 ($APP_PORT)" -ForegroundColor Green
            
            # 日志文件信息
            if (Test-Path $LOG_FILE) {
                $logSize = [math]::Round((Get-Item $LOG_FILE).Length / 1KB, 2)
                Write-Host "日志大小:   $logSize KB"
                Write-Host "日志文件:   $LOG_FILE"
            }
            
            Write-Host ""
            Write-Host "最近的日志 (最后10行):" -ForegroundColor Yellow
            Write-Host "----------------------------------------"
            if (Test-Path $LOG_FILE) {
                Get-Content $LOG_FILE -Tail 10 -ErrorAction SilentlyContinue
            } else {
                Write-Host "无法读取日志文件"
            }
        } else {
            Write-Host "⚠ 端口 $APP_PORT 被其他进程占用 (PID: $pid)" -ForegroundColor Yellow
            Write-Host "进程名称: $($process.ProcessName)"
        }
    } else {
        Write-Host "✗ 服务未运行" -ForegroundColor Red
        Write-Host "使用以下命令启动: .\node_manager.ps1 start"
    }
    
    Write-Host "========================================"
}

# 查看日志函数
function View-Logs {
    if (Test-Path $LOG_FILE) {
        Write-Host "实时查看日志 (Ctrl+C 退出):" -ForegroundColor Yellow
        Get-Content $LOG_FILE -Wait -Tail 20
    } else {
        Write-Host "日志文件不存在: $LOG_FILE" -ForegroundColor Red
    }
}

# 主逻辑
switch ($Action.ToLower()) {
    'start' {
        Start-App
    }
    'stop' {
        Stop-App
    }
    'restart' {
        Restart-App
    }
    'status' {
        Get-AppStatus
    }
    'logs' {
        View-Logs
    }
    default {
        Write-Host "========================================"
        Write-Host "宁夏智慧养殖监管平台 - 服务管理脚本 (Windows)"
        Write-Host "========================================"
        Write-Host "使用方法: .\node_manager.ps1 [start|stop|restart|status|logs]"
        Write-Host ""
        Write-Host "命令说明:"
        Write-Host "  start   - 启动服务"
        Write-Host "  stop    - 停止服务"
        Write-Host "  restart - 重启服务"
        Write-Host "  status  - 查看服务状态"
        Write-Host "  logs    - 实时查看日志"
        Write-Host ""
        Write-Host "配置信息:"
        Write-Host "  应用名称: $APP_NAME"
        Write-Host "  入口文件: $ENTRY_FILE"
        Write-Host "  监听端口: $APP_PORT"
        Write-Host "  日志文件: $LOG_FILE"
        Write-Host ""
        Write-Host "示例:"
        Write-Host "  .\node_manager.ps1 start    # 启动服务"
        Write-Host "  .\node_manager.ps1 status   # 查看状态"
        Write-Host "  .\node_manager.ps1 logs     # 查看日志"
    }
}