param(
    [string]$ServerStatusUrl = "https://qsfera.kusoft.xyz/status.php",
    [string]$ExpectedServerVersion = "7.0.0",
    [string]$ExpectedServerEdition = "stable",

    [string]$AndroidManifestUrl = "https://argus.kusoft.xyz/api/apps/qsfera-mobile/manifest?platform=android&channel=stable",
    [string]$ExpectedAndroidSlug = "qsfera-mobile",
    [string]$ExpectedAndroidPackageName = "eu.qsfera.android",
    [string]$ExpectedAndroidVersion = "1.3.12",
    [int]$ExpectedAndroidVersionCode = 40,
    [string]$ExpectedAndroidChannel = "stable",
    [string]$ExpectedAndroidPlatform = "android",
    [string]$ExpectedAndroidPackageKind = "apk",
    [string]$ExpectedAndroidSha256 = "279d00c6a43072caa0b26269f547fb0dc3268088aae5cd9f4ccfbbb485c35ded",
    [string]$AndroidDownloadUrl = "https://argus.kusoft.xyz/api/apps/qsfera-mobile/download/latest?platform=android&channel=stable",
    [switch]$VerifyAndroidDownload,

    [string]$DesktopUpdateFeedUrl = "https://qsfera.kusoft.xyz/desktop/updates/stable.xml",
    [switch]$RequireDesktopUpdate
)

$ErrorActionPreference = "Stop"

function Fail($Message) {
    Write-Error $Message
    exit 1
}

function Assert-AbsoluteHttpsUrl($Name, $Url) {
    $parsedUrl = $null
    if (-not [System.Uri]::TryCreate($Url, [System.UriKind]::Absolute, [ref]$parsedUrl)) {
        Fail "$Name must be an absolute URL: $Url"
    }

    if ($parsedUrl.Scheme -ne "https") {
        Fail "$Name must use HTTPS: $Url"
    }
}

function Assert-Equal($Name, $Actual, $Expected) {
    if ([string]$Actual -ne [string]$Expected) {
        Fail "$Name expected '$Expected' but got '$Actual'."
    }

    Write-Host "OK: $Name = $Actual"
}

function Assert-True($Name, [bool]$Value) {
    if (-not $Value) {
        Fail "$Name expected True but got False."
    }

    Write-Host "OK: $Name = True"
}

function Invoke-CheckedWebRequest($Name, $Url) {
    Assert-AbsoluteHttpsUrl $Name $Url

    try {
        $response = Invoke-WebRequest -Uri $Url -UseBasicParsing -TimeoutSec 30
    } catch {
        Fail "$Name request failed for ${Url}: $($_.Exception.Message)"
    }

    if ($response.StatusCode -ne 200) {
        Fail "$Name must return HTTP 200. Actual status: $($response.StatusCode)."
    }

    Write-Host "OK: $Name returned HTTP 200"
    return $response
}

function Convert-JsonContent($Name, $Content) {
    try {
        return $Content | ConvertFrom-Json -ErrorAction Stop
    } catch {
        Fail "$Name returned invalid JSON: $($_.Exception.Message)"
    }
}

function Get-RequiredProperty($Object, $Name, $Context) {
    $property = $Object.PSObject.Properties[$Name]
    if ($null -eq $property) {
        Fail "$Context is missing '$Name'."
    }

    return $property.Value
}

function Test-Sha256String($Value) {
    return [regex]::IsMatch($Value, "^[0-9a-f]{64}$")
}

Write-Host "Checking QSfera production server status..."
$serverResponse = Invoke-CheckedWebRequest "Server status endpoint" $ServerStatusUrl
$serverStatus = Convert-JsonContent "Server status endpoint" $serverResponse.Content
Assert-True "Server installed" ([bool](Get-RequiredProperty $serverStatus "installed" "Server status"))
Assert-Equal "Server maintenance" (Get-RequiredProperty $serverStatus "maintenance" "Server status") "False"
Assert-Equal "Server needsDbUpgrade" (Get-RequiredProperty $serverStatus "needsDbUpgrade" "Server status") "False"
Assert-Equal "Server edition" (Get-RequiredProperty $serverStatus "edition" "Server status") $ExpectedServerEdition
Assert-Equal "Server productversion" (Get-RequiredProperty $serverStatus "productversion" "Server status") $ExpectedServerVersion

Write-Host "Checking QSfera Android Argus manifest..."
$manifestResponse = Invoke-CheckedWebRequest "Android Argus manifest" $AndroidManifestUrl
$manifest = Convert-JsonContent "Android Argus manifest" $manifestResponse.Content
Assert-Equal "Android app slug" (Get-RequiredProperty $manifest "slug" "Android manifest") $ExpectedAndroidSlug
Assert-Equal "Android package name" (Get-RequiredProperty $manifest "androidPackageName" "Android manifest") $ExpectedAndroidPackageName

$release = Get-RequiredProperty $manifest "release" "Android manifest"
if ($null -eq $release) {
    Fail "Android manifest release must not be null."
}

Assert-Equal "Android release version" (Get-RequiredProperty $release "version" "Android release") $ExpectedAndroidVersion
Assert-Equal "Android versionCode" (Get-RequiredProperty $release "androidVersionCode" "Android release") $ExpectedAndroidVersionCode
Assert-Equal "Android release channel" (Get-RequiredProperty $release "channel" "Android release") $ExpectedAndroidChannel
Assert-Equal "Android release platform" (Get-RequiredProperty $release "platform" "Android release") $ExpectedAndroidPlatform
Assert-Equal "Android package kind" (Get-RequiredProperty $release "packageKind" "Android release") $ExpectedAndroidPackageKind
$releaseSha256 = Get-RequiredProperty $release "sha256" "Android release"
Assert-True "Android SHA-256 shape" (Test-Sha256String $releaseSha256)
Assert-Equal "Android SHA-256" $releaseSha256 $ExpectedAndroidSha256

if ($VerifyAndroidDownload) {
    Write-Host "Checking QSfera Android latest APK download..."
    Assert-AbsoluteHttpsUrl "Android download URL" $AndroidDownloadUrl
    $tempFile = [System.IO.Path]::GetTempFileName()
    try {
        try {
            Invoke-WebRequest -Uri $AndroidDownloadUrl -UseBasicParsing -TimeoutSec 120 -OutFile $tempFile | Out-Null
        } catch {
            Fail "Android download request failed for ${AndroidDownloadUrl}: $($_.Exception.Message)"
        }

        $downloadSize = (Get-Item -LiteralPath $tempFile).Length
        $expectedSize = Get-RequiredProperty $release "packageSizeBytes" "Android release"
        Assert-Equal "Android APK size" $downloadSize $expectedSize

        $downloadSha256 = (Get-FileHash -Algorithm SHA256 -LiteralPath $tempFile).Hash.ToLowerInvariant()
        Assert-Equal "Android APK download SHA-256" $downloadSha256 $ExpectedAndroidSha256
    } finally {
        Remove-Item -LiteralPath $tempFile -Force -ErrorAction SilentlyContinue
    }
}

Write-Host "Checking QSfera Desktop update feed..."
$desktopResponse = Invoke-CheckedWebRequest "Desktop update feed" $DesktopUpdateFeedUrl
try {
    [xml]$desktopFeed = $desktopResponse.Content
} catch {
    Fail "Desktop update feed returned invalid XML: $($_.Exception.Message)"
}

if ($desktopFeed.DocumentElement.Name -ne "QSfera") {
    Fail "Desktop update feed root element must be <QSfera>."
}

foreach ($elementName in @("version", "versionstring", "web", "downloadurl")) {
    if ($null -eq $desktopFeed.QSfera.$elementName) {
        Fail "Desktop update feed is missing <$elementName>."
    }
}

$desktopWeb = [string]$desktopFeed.QSfera.web
if (-not [string]::IsNullOrWhiteSpace($desktopWeb)) {
    Assert-AbsoluteHttpsUrl "Desktop update feed <web>" $desktopWeb
}

$desktopVersion = [string]$desktopFeed.QSfera.version
$desktopVersionString = [string]$desktopFeed.QSfera.versionstring
$desktopDownloadUrl = [string]$desktopFeed.QSfera.downloadurl

if ([string]::IsNullOrWhiteSpace($desktopVersion)) {
    if ($RequireDesktopUpdate) {
        Fail "Desktop update feed must advertise a concrete version when -RequireDesktopUpdate is set."
    }

    if (-not [string]::IsNullOrWhiteSpace($desktopDownloadUrl)) {
        Fail "Desktop no-update feed must leave <downloadurl> empty when <version> is empty."
    }

    Write-Host "OK: Desktop update feed is a valid no-update feed"
} else {
    $parsedVersion = $null
    if (-not [System.Version]::TryParse($desktopVersion, [ref]$parsedVersion)) {
        Fail "Desktop update feed <version> must be parseable as a version number."
    }

    if ([string]::IsNullOrWhiteSpace($desktopVersionString)) {
        Fail "Desktop update feed must set <versionstring> when <version> is present."
    }

    Assert-AbsoluteHttpsUrl "Desktop update feed <downloadurl>" $desktopDownloadUrl
    $downloadUri = [System.Uri]$desktopDownloadUrl
    if (-not $downloadUri.AbsolutePath.EndsWith(".msi", [System.StringComparison]::OrdinalIgnoreCase)) {
        Fail "Desktop Windows updater expects an MSI download URL."
    }

    Write-Host "OK: Desktop update feed advertises version $desktopVersionString"
}

Write-Host "QSfera production endpoint verification passed."