#requires -Version 5.1
<# Rabijinnie's Space：直接下载发布程序，不调用 claude.ai/install.ps1。 #>
[CmdletBinding()]
param(
    [Parameter(Position = 0)]
    [ValidatePattern('\A(latest|stable|[0-9]+\.[0-9]+\.[0-9]+)\z')]
    [string]$Target = 'latest',
    [switch]$DryRun
)

# 独立作用域：兼容 irm | iex，不退出读者的 PowerShell。
& {
    param([string]$InstallTarget, [switch]$Preview)
    Set-StrictMode -Version Latest
    $ErrorActionPreference = 'Stop'
    $ProgressPreference = 'SilentlyContinue'
    $stageDir = $null
    $versionTemp = $null
    $binTemp = $null
    try {
        if ($env:OS -ne 'Windows_NT') { throw '此脚本用于 Windows。Mac / Linux / WSL 请使用 cc.sh。' }
        if (-not [Environment]::Is64BitProcess) { throw '请使用 64 位 Windows PowerShell 或 PowerShell 7。' }
        if ($env:PROCESSOR_ARCHITECTURE -eq 'ARM64' -or $env:PROCESSOR_ARCHITEW6432 -eq 'ARM64') {
            $platform = 'win32-arm64'
        } else { $platform = 'win32-x64' }
        $repo = 'https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases'
        Write-Host "Claude Code 直接安装`n所选版本：$InstallTarget`n系统架构：$platform`n程序源：$repo"
        Write-Host '流程：读取对应版本清单 → 下载程序 → 校验 SHA256 和大小 → 安装。'
        if ($Preview) { return }
        [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
        $stageDir = Join-Path ([IO.Path]::GetTempPath()) ('claude-code-setup-' + [Guid]::NewGuid().ToString('N'))
        New-Item -ItemType Directory -Path $stageDir | Out-Null
        function Get-ReleaseFile {
            param([string]$Url, [string]$Destination, [int]$Timeout = 120)
            for ($attempt = 1; $attempt -le 3; $attempt++) {
                try {
                    # 固定 HTTPS 发布桶，无需跟随重定向或关闭证书校验。
                    Invoke-WebRequest -Uri $Url -OutFile $Destination -UseBasicParsing -TimeoutSec $Timeout -MaximumRedirection 0
                    if ((Get-Item -LiteralPath $Destination).Length -eq 0) { throw '下载内容为空。' }
                    return
                } catch {
                    if ($attempt -eq 3) { throw ('下载失败：' + $Url + '。请检查版本是否存在、程序源连接及网络设置。' + $_.Exception.Message) }
                    Start-Sleep -Seconds 2
                }
            }
        }
        function Read-ReleaseText {
            param([string]$Path)
            $text = [IO.File]::ReadAllText($Path).Trim()
            if ($text -match '(?is)^\s*<(!doctype\s+html|html(\s|>))') { throw '程序源返回了 HTML 网页。请检查网络认证、代理或访问限制。' }
            return $text
        }
        Write-Host "`n[1/4] 读取版本与校验清单……"
        $version = $InstallTarget
        if ($InstallTarget -eq 'latest' -or $InstallTarget -eq 'stable') {
            $channelPath = Join-Path $stageDir 'channel'
            Get-ReleaseFile -Url "$repo/$InstallTarget" -Destination $channelPath
            $version = Read-ReleaseText $channelPath
        }
        if ($version -notmatch '\A[0-9]+\.[0-9]+\.[0-9]+\z') { throw '程序源返回了无效版本号。' }
        Write-Host "实际下载版本：$version"
        $manifestPath = Join-Path $stageDir 'manifest.json'
        Get-ReleaseFile -Url "$repo/$version/manifest.json" -Destination $manifestPath
        $manifest = (Read-ReleaseText $manifestPath) | ConvertFrom-Json
        if (-not $manifest.PSObject.Properties['version'] -or $manifest.version -cne $version) { throw '清单版本与所选版本不一致。' }
        if (-not $manifest.PSObject.Properties['platforms'] -or -not $manifest.platforms.PSObject.Properties[$platform]) { throw "这个版本没有 $platform 的安装文件。" }
        $entry = $manifest.platforms.PSObject.Properties[$platform].Value
        if (-not $entry.PSObject.Properties['checksum'] -or [string]$entry.checksum -notmatch '\A[a-fA-F0-9]{64}\z') { throw '清单中的 SHA256 格式无效。' }
        $checksum = ([string]$entry.checksum).ToLowerInvariant()
        [long]$expectedSize = 0
        if (-not $entry.PSObject.Properties['size'] -or -not [long]::TryParse([string]$entry.size, [ref]$expectedSize) -or $expectedSize -le 0) { throw '清单中的文件大小无效。' }
        if (-not $entry.PSObject.Properties['binary'] -or $entry.binary -cne 'claude.exe') { throw '清单中的程序名称无效。' }

        Write-Host "`n[2/4] 下载程序（约 $expectedSize 字节，耗时取决于网络）……"
        $downloadUrl = "$repo/$version/$platform/claude.exe"
        Write-Host "下载地址：$downloadUrl"
        $binaryPath = Join-Path $stageDir 'claude.exe'
        Get-ReleaseFile -Url $downloadUrl -Destination $binaryPath -Timeout 1800
        if ((Get-Item -LiteralPath $binaryPath).Length -ne $expectedSize) { throw '文件大小不匹配，未安装。' }
        $actualHash = (Get-FileHash -LiteralPath $binaryPath -Algorithm SHA256).Hash.ToLowerInvariant()
        if ($actualHash -cne $checksum) { throw 'SHA256 校验失败，未运行程序、未替换已有安装。' }
        Write-Host 'SHA256 与文件大小校验通过。'

        Write-Host "`n[3/4] 检查程序并安装……"
        $versionOutput = & $binaryPath --version
        if ($LASTEXITCODE -ne 0) { throw '下载的程序无法启动，未替换已有安装。请检查系统版本和运行依赖。' }
        $versionText = ($versionOutput -join "`n").Trim()
        if ($versionText -notmatch '\A([0-9]+\.[0-9]+\.[0-9]+)\s+\(Claude Code\)') { throw '程序没有返回预期版本信息，未安装。' }
        if ($Matches[1] -cne $version) { throw '程序实际版本与清单不一致，未安装。' }
        $versionsDir = Join-Path $env:USERPROFILE '.local\share\claude\versions'
        $binDir = Join-Path $env:USERPROFILE '.local\bin'
        New-Item -ItemType Directory -Force -Path $versionsDir, $binDir | Out-Null
        $finalPath = Join-Path $versionsDir "$version.exe"
        $linkPath = Join-Path $binDir 'claude.exe'
        if ((Test-Path -LiteralPath $finalPath -PathType Container) -or (Test-Path -LiteralPath $linkPath -PathType Container)) { throw '程序目标位置是一个目录，请检查现有安装。' }
        $suffix = [Guid]::NewGuid().ToString('N')
        $versionTemp = Join-Path $versionsDir ".claude-install-$suffix.exe"
        Copy-Item -LiteralPath $binaryPath -Destination $versionTemp
        if (Test-Path -LiteralPath $finalPath) {
            $versionBackup = "$finalPath.backup.$suffix"
            [IO.File]::Replace($versionTemp, $finalPath, $versionBackup)
        } else { [IO.File]::Move($versionTemp, $finalPath) }
        $versionTemp = $null
        $binTemp = Join-Path $binDir ".claude-install-$suffix.exe"
        Copy-Item -LiteralPath $finalPath -Destination $binTemp
        if (Test-Path -LiteralPath $linkPath) {
            $binBackup = "$linkPath.backup.$suffix"
            [IO.File]::Replace($binTemp, $linkPath, $binBackup)
            Write-Host "原命令已备份：$binBackup"
        } else { [IO.File]::Move($binTemp, $linkPath) }
        $binTemp = $null

        Write-Host "`n[4/4] 安装完成`n$versionText`n位置：$linkPath"
        Write-Host '已有账号与 API 配置已保留。本脚本不修改自动更新设置；指定版本不等于永久锁定版本。'
        Write-Host '打开新终端，输入 claude 就能启动。若提示找不到命令，请按教程添加用户 PATH，或先运行：'
        Write-Host '$env:Path = "$env:USERPROFILE\.local\bin;$env:Path"'
        Write-Host '再运行 claude --version 和 claude doctor。'
    } catch {
        throw ('安装未完成：' + $_.Exception.Message + ' 如果提示程序被占用，请关闭 Claude Code 后重试。不会自动换装其他版本。')
    } finally {
        foreach ($tempFile in @($versionTemp, $binTemp)) {
            if ($tempFile -and (Test-Path -LiteralPath $tempFile)) { Remove-Item -LiteralPath $tempFile -Force -ErrorAction SilentlyContinue }
        }
        if ($stageDir -and (Test-Path -LiteralPath $stageDir)) { Remove-Item -LiteralPath $stageDir -Recurse -Force -ErrorAction SilentlyContinue }
    }
} -InstallTarget $Target -Preview:$DryRun