<#
    setup-webview2.ps1 — 拉取 WebView2 SDK（托管 DLL + Loader），供 shell/float-window.ps1 内嵌 Chromium 使用。

    为什么要这么绕：本机 PowerShell 的 schannel 凭据在当前沙箱里不可用
    (SEC_E_NO_CREDENTIALS)，Invoke-WebRequest/curl 走不通；Node 自带 OpenSSL，网络正常。
    所以优先用 node 下载，并保留 Invoke-WebRequest 作为通用回退。
#>
[CmdletBinding()]
param(
    [string]$Dest,
    [string]$Cache
)

$ErrorActionPreference = 'Stop'
# 在无控制台的宿主（被 harness / 计划任务拉起）里 Write-Progress 会抛 Win32 "Access is denied"
$ProgressPreference = 'SilentlyContinue'
$root = Split-Path -Parent $MyInvocation.MyCommand.Path | Split-Path -Parent
if (-not $Dest) { $Dest = Join-Path $root 'shell\lib' }
if (-not $Cache) { $Cache = Join-Path $root '.cache' }
New-Item -ItemType Directory -Force -Path $Dest, $Cache | Out-Null

if (Test-Path (Join-Path $Dest 'Microsoft.Web.WebView2.WinForms.dll')) {
    Write-Host "[setup] WebView2 SDK 已存在：$Dest"
    exit 0
}

$nupkg = Join-Path $Cache 'webview2.nupkg'
$needDownload = $true
if (Test-Path $nupkg) { $needDownload = $false }

if ($needDownload) {
    $nodeScript = @'
const fs = require('node:fs')
const idx = 'https://api.nuget.org/v3-flatcontainer/microsoft.web.webview2/index.json'
async function main() {
  const j = await (await fetch(idx, { signal: AbortSignal.timeout(30000) })).json()
  const stable = j.versions.filter((v) => !v.includes('-'))
  const v = stable[stable.length - 1]
  const url = `https://api.nuget.org/v3-flatcontainer/microsoft.web.webview2/${v}/microsoft.web.webview2.${v}.nupkg`
  const buf = Buffer.from(await (await fetch(url, { signal: AbortSignal.timeout(120000) })).arrayBuffer())
  fs.writeFileSync(process.argv[2], buf)
  console.log(v)
}
main().catch((e) => { console.error('download failed: ' + e.message); process.exit(1) })
'@
    $nodeFile = Join-Path $Cache 'download-webview2.cjs'
    Set-Content -Path $nodeFile -Value $nodeScript -Encoding UTF8

    $version = $null
    if (Get-Command node -ErrorAction SilentlyContinue) {
        $version = (& node $nodeFile $nupkg | Select-Object -Last 1)
    }
    if (-not (Test-Path $nupkg)) {
        # 回退：本机 PowerShell 的 TLS 可用时走这里
        $v = (Invoke-RestMethod 'https://api.nuget.org/v3-flatcontainer/microsoft.web.webview2/index.json').versions |
            Where-Object { $_ -notmatch '-' } | Select-Object -Last 1
        Invoke-WebRequest "https://api.nuget.org/v3-flatcontainer/microsoft.web.webview2/$v/microsoft.web.webview2.$v.nupkg" -OutFile $nupkg
        $version = $v
    }
    Write-Host "[setup] 下载 WebView2 SDK $version"
}

$extract = Join-Path $Cache 'extract'
Remove-Item -Recurse -Force $extract -ErrorAction SilentlyContinue
# Expand-Archive (PS 5.1) 只认 .zip 扩展名，nupkg 本质就是 zip，复制一份再解
$zip = Join-Path $Cache 'webview2.zip'
Copy-Item $nupkg $zip -Force
Expand-Archive -Path $zip -DestinationPath $extract -Force

# 包内布局随版本变（1.0.4191.47 是 lib\net462\），按文件名找 + 目录偏好挑选
$wanted = @(
    @{ Leaf = 'Microsoft.Web.WebView2.Core.dll';     Prefer = '\\lib\\net4' },
    @{ Leaf = 'Microsoft.Web.WebView2.WinForms.dll'; Prefer = '\\lib\\net4' },
    @{ Leaf = 'WebView2Loader.dll';                  Prefer = 'runtimes\\win-x64\\native' }
)
foreach ($w in $wanted) {
    $hits = @(Get-ChildItem $extract -Recurse -File -Filter $w.Leaf -ErrorAction SilentlyContinue)
    if (-not $hits) { throw "包内找不到 $($w.Leaf)" }
    $pick = @($hits | Where-Object { $_.FullName -match $w.Prefer } | Select-Object -First 1)
    if (-not $pick) { $pick = @($hits | Select-Object -First 1) }
    Copy-Item $pick[0].FullName (Join-Path $Dest $w.Leaf) -Force
    Write-Host "[setup] + $($w.Leaf)  <- $($pick[0].FullName.Replace($extract, ''))"
}

$missing = @($wanted | Where-Object { -not (Test-Path (Join-Path $Dest $_.Leaf)) })
if ($missing) { throw "缺少文件：$(($missing | ForEach-Object { $_.Leaf }) -join ', ')" }
Write-Host "[setup] 完成：$Dest"