# ============================================================================
# MilliSim 后端部署脚本（IIS 独立后端 + 反向代理架构）
# 在部署服务器上以管理员身份运行 PowerShell 执行此脚本
# 用法：.\deploy-to-iis.ps1 -DeployDir "C:\MilliSim\Backend" -ZipPath "C:\Deploy\MilliSim.Api.publish.clean.zip"
# ============================================================================

param(
    [Parameter(Mandatory=$true)]
    [string]$DeployDir,
    [Parameter(Mandatory=$true)]
    [string]$ZipPath,
    [string]$ServiceName = "MilliSimApi"
)

$ErrorActionPreference = "Stop"

Write-Host "================================================" -ForegroundColor Cyan
Write-Host "  MilliSim 后端部署脚本" -ForegroundColor Cyan
Write-Host "================================================" -ForegroundColor Cyan
Write-Host "部署目录: $DeployDir"
Write-Host "发布包:   $ZipPath"
Write-Host "服务名:   $ServiceName"
Write-Host ""

# 1. 前置检查
Write-Host "[1/7] 前置检查..." -ForegroundColor Yellow
if (-not (Test-Path $ZipPath)) { throw "发布包不存在: $ZipPath" }
if (-not (Test-Path $DeployDir)) { throw "部署目录不存在: $DeployDir" }
if (-not (Test-Path "$DeployDir\MilliSim.Api.dll")) { throw "部署目录下未找到 MilliSim.Api.dll，确认是否正确的部署目录" }
Write-Host "  [OK] 检查通过" -ForegroundColor Green

# 2. 备份当前部署目录
$timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
$backupDir = "$DeployDir.bak_$timestamp"
Write-Host "[2/7] 备份当前部署目录到: $backupDir" -ForegroundColor Yellow
Copy-Item -Path $DeployDir -Destination $backupDir -Recurse -Force
Write-Host "  [OK] 备份完成" -ForegroundColor Green

# 3. 停止后端服务
Write-Host "[3/7] 停止后端服务..." -ForegroundColor Yellow
$serviceStopped = $false
try {
    $svc = Get-Service -Name $ServiceName -ErrorAction Stop
    if ($svc.Status -eq "Running") {
        Stop-Service -Name $ServiceName -Force
        Start-Sleep -Seconds 2
        Write-Host "  [OK] Windows 服务 '$ServiceName' 已停止" -ForegroundColor Green
    } else {
        Write-Host "  [SKIP] 服务已处于停止状态" -ForegroundColor Gray
    }
    $serviceStopped = $true
} catch {
    Write-Host "  [INFO] 未找到 Windows 服务 '$ServiceName'，尝试查找 dotnet 进程..." -ForegroundColor Gray
    $procs = Get-Process -Name "dotnet","MilliSim.Api" -ErrorAction SilentlyContinue | Where-Object { $_.Path -like "*$DeployDir*" }
    if ($procs) {
        $procs | Stop-Process -Force
        Start-Sleep -Seconds 2
        Write-Host "  [OK] 已终止 dotnet 进程: $($procs.Id -join ', ')" -ForegroundColor Green
    } else {
        Write-Host "  [INFO] 未找到运行中的后端进程" -ForegroundColor Gray
    }
}

# 4. 备份当前 appsettings.json（保留服务器配置）
$appSettingsPath = "$DeployDir\appsettings.json"
$appSettingsBackup = "$DeployDir\appsettings.json.server_backup"
if (Test-Path $appSettingsPath) {
    Copy-Item -Path $appSettingsPath -Destination $appSettingsBackup -Force
    Write-Host "[4/7] 已备份服务器 appsettings.json 到: $appSettingsBackup" -ForegroundColor Green
} else {
    Write-Host "[4/7] 部署目录无 appsettings.json，跳过备份" -ForegroundColor Gray
}

# 5. 解压新代码（不删除 wwwroot/uploads 和 wwwroot/backups 的文件）
Write-Host "[5/7] 解压新代码到部署目录..." -ForegroundColor Yellow
Add-Type -AssemblyName System.IO.Compression.FileSystem
$zip = [System.IO.Compression.ZipFile]::OpenRead($ZipPath)
try {
    foreach ($entry in $zip.Entries) {
        # 跳过 wwwroot/uploads 和 wwwroot/backups 下的所有文件（保留服务器上的上传文件）
        if ($entry.FullName -match "^wwwroot/uploads/" -and $entry.Length -gt 0) { continue }
        if ($entry.FullName -match "^wwwroot/backups/" -and $entry.Length -gt 0) { continue }

        $targetPath = Join-Path $DeployDir $entry.FullName
        $targetDir = Split-Path $targetPath -Parent
        if (-not (Test-Path $targetDir)) { New-Item -ItemType Directory -Path $targetDir -Force | Out-Null }

        if ($entry.Length -gt 0) {
            [System.IO.Compression.ZipFileExtensions]::ExtractToFile($entry, $targetPath, $true)
        } elseif (-not (Test-Path $targetPath)) {
            New-Item -ItemType Directory -Path $targetPath -Force | Out-Null
        }
    }
    Write-Host "  [OK] 解压完成（已保留 wwwroot/uploads 和 wwwroot/backups 中的文件）" -ForegroundColor Green
} finally {
    $zip.Dispose()
}

# 6. 恢复服务器 appsettings.json（如果存在备份）
if (Test-Path $appSettingsBackup) {
    Copy-Item -Path $appSettingsBackup -Destination $appSettingsPath -Force
    Write-Host "[6/7] 已恢复服务器 appsettings.json（保留端口/连接字符串配置）" -ForegroundColor Green
} else {
    Write-Host "[6/7] 未恢复 appsettings.json（使用发布包默认配置）" -ForegroundColor Gray
}

# 7. 启动后端服务
Write-Host "[7/7] 启动后端服务..." -ForegroundColor Yellow
if ($serviceStopped) {
    try {
        Start-Service -Name $ServiceName -ErrorAction Stop
        Start-Sleep -Seconds 3
        $svc = Get-Service -Name $ServiceName
        if ($svc.Status -eq "Running") {
            Write-Host "  [OK] Windows 服务 '$ServiceName' 已启动" -ForegroundColor Green
        } else {
            Write-Host "  [WARN] 服务启动状态: $($svc.Status)" -ForegroundColor Yellow
        }
    } catch {
        Write-Host "  [ERROR] 服务启动失败: $_" -ForegroundColor Red
        Write-Host "  请手动启动服务或检查日志" -ForegroundColor Yellow
    }
} else {
    Write-Host "  [INFO] 之前未通过 Windows 服务停止，请用原启动方式重启后端" -ForegroundColor Gray
    Write-Host "  例如: cd $DeployDir; dotnet MilliSim.Api.dll --urls http://localhost:30001" -ForegroundColor Gray
}

# 验证
Write-Host ""
Write-Host "================================================" -ForegroundColor Cyan
Write-Host "  部署完成，开始验证" -ForegroundColor Cyan
Write-Host "================================================" -ForegroundColor Cyan
Start-Sleep -Seconds 5

Write-Host "[验证 1] 检查后端端口 30001 是否监听..." -ForegroundColor Yellow
$conn = Test-NetConnection -ComputerName localhost -Port 30001 -WarningAction SilentlyContinue
if ($conn.TcpTestSucceeded) {
    Write-Host "  [OK] 端口 30001 监听正常" -ForegroundColor Green
} else {
    Write-Host "  [FAIL] 端口 30001 未监听，请检查后端启动日志" -ForegroundColor Red
}

Write-Host "[验证 2] 调用 /api/system/public-settings ..." -ForegroundColor Yellow
try {
    $resp = Invoke-WebRequest -Uri "http://localhost:30001/api/system/public-settings" -UseBasicParsing -TimeoutSec 10
    Write-Host "  [OK] HTTP $($resp.StatusCode)" -ForegroundColor Green
} catch {
    Write-Host "  [FAIL] 请求失败: $_" -ForegroundColor Red
}

Write-Host "[验证 3] 检查 /uploads/ 路径是否由后端服务 ..." -ForegroundColor Yellow
try {
    $resp = Invoke-WebRequest -Uri "http://localhost:30001/uploads/" -UseBasicParsing -TimeoutSec 10
    Write-Host "  [OK] HTTP $($resp.StatusCode)" -ForegroundColor Green
} catch {
    $code = $_.Exception.Response.StatusCode.value__
    if ($code -eq 404) {
        Write-Host "  [OK] HTTP 404（目录浏览禁用，符合预期）" -ForegroundColor Green
    } else {
        Write-Host "  [INFO] HTTP $code" -ForegroundColor Gray
    }
}

Write-Host ""
Write-Host "================================================" -ForegroundColor Cyan
Write-Host "  部署脚本结束" -ForegroundColor Cyan
Write-Host "================================================" -ForegroundColor Cyan
Write-Host ""
Write-Host "下一步：在浏览器访问前端页面，验证以下 4 个问题是否全部解决：" -ForegroundColor White
Write-Host "  1. 员工管理页面头像加载（应返回 /uploads/avatars/xxx.png，不再请求 COS）"
Write-Host "  2. 轮播图列表页图片加载"
Write-Host "  3. 项目封面/视频加载"
Write-Host "  4. WebGL 资源加载（.unityweb 文件应返回 200 + application/octet-stream）"
Write-Host ""
Write-Host "如需回滚：删除 $DeployDir，重命名 $backupDir 为 $DeployDir，重启服务" -ForegroundColor Gray
Write-Host ""
Write-Host "如服务器上缺少 COS 模式时上传的旧文件，可调用迁移端点补齐："
Write-Host "  Invoke-WebRequest -Uri 'http://localhost:30001/api/system/migrate-cos-to-local' -Method POST -Headers @{Authorization='Bearer <admin token>'}"