[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"

function Get-AndroidSdkRoot {
    $candidates = @(
        $env:ANDROID_SDK_ROOT,
        $env:ANDROID_HOME,
        (Join-Path $env:LOCALAPPDATA "Android\Sdk")
    )

    foreach ($candidate in $candidates) {
        if ($candidate -and (Test-Path -LiteralPath $candidate -PathType Container)) {
            return (Resolve-Path -LiteralPath $candidate).Path
        }
    }

    throw "Android SDK root was not found. Install command-line tools or set ANDROID_SDK_ROOT."
}

function Get-LatestAndroidSdkPackageDirectory {
    param(
        [Parameter(Mandatory=$true)][string]$SdkRoot,
        [Parameter(Mandatory=$true)][string]$PackageName
    )

    $packageRoot = Join-Path $SdkRoot $PackageName
    if (!(Test-Path -LiteralPath $packageRoot -PathType Container)) {
        throw "Android SDK package directory not found: $packageRoot"
    }

    $packages = @(Get-ChildItem -LiteralPath $packageRoot -Directory |
        Where-Object { $_.Name -match '^\d+(\.\d+)*$' } |
        Sort-Object { [version]$_.Name } -Descending)

    if ($packages.Count -eq 0) {
        throw "No installed Android SDK package versions found under $packageRoot"
    }

    return $packages[0]
}

function Set-AndroidSdkToolchainEnvironment {
    $sdkRoot = Get-AndroidSdkRoot
    $ndk = Get-LatestAndroidSdkPackageDirectory -SdkRoot $sdkRoot -PackageName "ndk"
    $cmake = Get-LatestAndroidSdkPackageDirectory -SdkRoot $sdkRoot -PackageName "cmake"
    $cmakeCommand = Join-Path $cmake.FullName "bin\cmake.exe"

    if (!(Test-Path -LiteralPath $cmakeCommand -PathType Leaf)) {
        throw "Android SDK CMake executable not found: $cmakeCommand"
    }

    $env:ANDROID_HOME = $sdkRoot
    $env:ANDROID_SDK_ROOT = $sdkRoot
    $env:ANDROID_NDK_HOME = $ndk.FullName
    $env:ANDROID_NDK_ROOT = $ndk.FullName

    return [ordered]@{
        sdkRoot = $sdkRoot
        ndkVersion = $ndk.Name
        ndkPath = $ndk.FullName
        cmakeVersion = $cmake.Name
        cmakeCommand = $cmakeCommand
    }
}