# Download settings are process-local; never edit global pip/npm/uv settings.
# Keep this file ASCII for Windows PowerShell 5.1.

function Initialize-ArtemisDownloads {
    param([string]$ProjectRoot, [string]$Mode)
    $path = Join-Path $ProjectRoot 'config\downloads.json'
    $config = Get-Content -LiteralPath $path -Raw -ErrorAction Stop | ConvertFrom-Json -ErrorAction Stop
    if (-not $Mode) { $Mode = $config.mode }
    if ($Mode -notin @('Official', 'China')) { throw 'Download mode must be Official or China.' }
    $timeout = 0
    if (-not [int]::TryParse([string]$config.timeout_seconds, [ref]$timeout) -or $timeout -lt 10 -or $timeout -gt 3600) {
        throw 'config/downloads.json: timeout_seconds must be between 10 and 3600.'
    }
    $values = @{
        python_index = ''; python_download_mirror = ''; npm_registry = ''
        node_mirror = 'https://nodejs.org/dist'
        adb_url = 'https://dl.google.com/android/repository/platform-tools-latest-windows.zip'
        scrcpy_url = 'https://github.com/Genymobile/scrcpy/releases/download/v4.1/scrcpy-win64-v4.1.zip'
        uv_installer_url = 'https://astral.sh/uv/install.ps1'
    }
    foreach ($name in @($values.Keys)) {
        if ($Mode -eq 'China' -and $config.china.$name) { $values[$name] = [string]$config.china.$name }
        if ($config.overrides.$name) { $values[$name] = [string]$config.overrides.$name }
        if ($values[$name]) {
            $uri = $null
            if (-not [Uri]::TryCreate($values[$name], [UriKind]::Absolute, [ref]$uri) -or $uri.Scheme -ne 'https') {
                throw "config/downloads.json: $name must be an HTTPS URL."
            }
        }
    }
    # Explicit caller environment settings take priority over the selected preset.
    if ($env:UV_DEFAULT_INDEX) { $values.python_index = $env:UV_DEFAULT_INDEX }
    elseif ($env:UV_INDEX_URL) { $values.python_index = $env:UV_INDEX_URL }
    if ($env:UV_PYTHON_INSTALL_MIRROR) { $values.python_download_mirror = $env:UV_PYTHON_INSTALL_MIRROR }
    if ($env:npm_config_registry) { $values.npm_registry = $env:npm_config_registry }
    if ($values.python_download_mirror) { $env:UV_PYTHON_INSTALL_MIRROR = $values.python_download_mirror }
    if ($values.npm_registry) { $env:npm_config_registry = $values.npm_registry }
    $env:UV_HTTP_TIMEOUT = [string]$timeout
    $env:npm_config_fetch_timeout = [string]($timeout * 1000)
    $values.mode = $Mode
    $values.timeout_seconds = $timeout
    $script:ArtemisDownloads = [pscustomobject]$values
    Write-Host "   [INFO] Download mode: $Mode (config/downloads.json)." -ForegroundColor Cyan
}

function Install-ArtemisUvFromIndex {
    param([string]$IndexUrl, [string]$InstallDir = (Join-Path $env:USERPROFILE '.local\bin'))
    # A uv wheel contains the standalone executable; no preinstalled Python is needed.
    $work = Join-Path ([IO.Path]::GetTempPath()) ('artemis-uv-' + [guid]::NewGuid().ToString('N'))
    New-Item -ItemType Directory -Path $work -ErrorAction Stop | Out-Null
    try {
        $index = $IndexUrl.TrimEnd('/') + '/uv/'
        $page = Join-Path $work 'index.html'
        if (-not (Invoke-DownloadFile -Uri $index -OutFile $page)) { throw 'Could not download the uv package index.' }
        $platform = if ($env:PROCESSOR_ARCHITECTURE -eq 'ARM64' -or $env:PROCESSOR_ARCHITEW6432 -eq 'ARM64') { 'win_arm64' } else { 'win_amd64' }
        $pattern = 'href=["''](?<link>[^"'']*uv-(?<version>\d+\.\d+\.\d+)-py3-none-' + $platform + '\.whl#sha256=(?<hash>[a-fA-F0-9]{64}))["'']'
        $candidates = [regex]::Matches((Get-Content -LiteralPath $page -Raw), $pattern)
        $candidate = $candidates | Sort-Object { [version]$_.Groups['version'].Value } -Descending | Select-Object -First 1
        if (-not $candidate) { throw "No stable uv wheel for $platform was found on the selected index." }
        $url = [Uri]::new([Uri]$index, [System.Net.WebUtility]::HtmlDecode($candidate.Groups['link'].Value))
        if ($url.Scheme -ne 'https') { throw 'The uv download must use HTTPS.' }
        $zip = Join-Path $work 'uv.zip'
        if (-not (Invoke-DownloadFile -Uri $url.AbsoluteUri.Split('#')[0] -OutFile $zip)) { throw 'Could not download uv from the selected index.' }
        $hasher = [Security.Cryptography.SHA256]::Create()
        $stream = [IO.File]::OpenRead($zip)
        try { $digest = [BitConverter]::ToString($hasher.ComputeHash($stream)).Replace('-', '') }
        finally { $stream.Dispose(); $hasher.Dispose() }
        if ($digest -ne $candidate.Groups['hash'].Value) {
            throw 'The downloaded uv package failed SHA256 verification.'
        }
        $extract = Join-Path $work 'wheel'
        Add-Type -AssemblyName System.IO.Compression.FileSystem
        [IO.Compression.ZipFile]::ExtractToDirectory($zip, $extract)
        $executable = Get-ChildItem -LiteralPath $extract -Filter uv.exe -Recurse -File | Select-Object -First 1
        if (-not $executable) { throw 'The uv package did not contain uv.exe.' }
        New-Item -ItemType Directory -Path $InstallDir -Force -ErrorAction Stop | Out-Null
        Copy-Item -LiteralPath $executable.FullName -Destination (Join-Path $InstallDir 'uv.exe') -Force -ErrorAction Stop
        $uvx = Join-Path $executable.DirectoryName 'uvx.exe'
        if (Test-Path -LiteralPath $uvx) { Copy-Item -LiteralPath $uvx -Destination $InstallDir -Force -ErrorAction Stop }
        $env:PATH = "$InstallDir;$env:PATH"
    } finally {
        $resolved = (Resolve-Path -LiteralPath $work).Path
        $tempRoot = [IO.Path]::GetFullPath([IO.Path]::GetTempPath()).TrimEnd('\') + '\'
        if ($resolved.StartsWith($tempRoot, [StringComparison]::OrdinalIgnoreCase) -and (Split-Path $resolved -Leaf) -like 'artemis-uv-*') {
            Remove-Item -LiteralPath $resolved -Recurse -Force -ErrorAction SilentlyContinue
        }
    }
}

function Install-ArtemisLockedDependencies {
    param([string]$PythonExe, [string]$IndexUrl)
    # uv sync uses the original artifact URLs in uv.lock. Export exact versions and
    # hashes, then let uv pip fetch those same artifacts through the chosen index.
    $requirements = Join-Path ([IO.Path]::GetTempPath()) ('artemis-requirements-' + [guid]::NewGuid().ToString('N') + '.txt')
    try {
        & uv export --frozen --no-dev --format requirements-txt --output-file $requirements 1>$null
        if ($LASTEXITCODE -ne 0) { throw 'Could not export the locked dependencies.' }
        & uv pip install --python $PythonExe --index-url $IndexUrl --requirements $requirements | Out-Host
        if ($LASTEXITCODE -ne 0) { throw 'Dependency installation failed. Check mirror availability or select another source in config/downloads.json.' }
    } finally {
        Remove-Item -LiteralPath $requirements -Force -ErrorAction SilentlyContinue
    }
}