[CmdletBinding()]
param(
    [string]$ConfigPath = ''
)

$ErrorActionPreference = 'Stop'
$projectRoot = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
if (-not $ConfigPath) { $ConfigPath = Join-Path $projectRoot 'config\migration.psd1' }
if (-not [System.IO.Path]::IsPathRooted($ConfigPath)) {
    $ConfigPath = Join-Path $projectRoot $ConfigPath
}
if (-not (Test-Path -LiteralPath $ConfigPath)) {
    throw 'Run scripts\initialize-migration.ps1 and edit config\migration.psd1 first.'
}
$config = Import-PowerShellDataFile -LiteralPath $ConfigPath

$javaCandidates = @(
    [string]$config.JavaHome,
    $env:JAVA_HOME,
    'C:\Program Files\Android\Android Studio\jbr'
) | Where-Object { $_ -and (Test-Path -LiteralPath $_) }
$javaHome = $javaCandidates | Select-Object -First 1
$javaOk = $false
$javaSummary = 'not found'
if ($javaHome) {
    $javaExe = Join-Path $javaHome 'bin\java.exe'
    if (Test-Path -LiteralPath $javaExe) {
        $savedErrorAction = $ErrorActionPreference
        $ErrorActionPreference = 'Continue'
        $javaOutput = (& $javaExe -version 2>&1 | Out-String)
        $ErrorActionPreference = $savedErrorAction
        $javaSummary = ($javaOutput -split "`r?`n" | Select-Object -First 1).Trim()
        $javaMajor = if ($javaOutput -match 'version "(?<major>\d+)') {
            [int]$Matches.major
        } else {
            0
        }
        $javaOk = $javaMajor -ge 17
    }
}

$sdkCandidates = @(
    [string]$config.AndroidSdk,
    $env:ANDROID_SDK_ROOT,
    $env:ANDROID_HOME,
    (Join-Path $env:LOCALAPPDATA 'Android\Sdk')
) | Where-Object { $_ -and (Test-Path -LiteralPath $_) }
$androidSdk = $sdkCandidates | Select-Object -First 1
$platform35 = $androidSdk -and (
    Test-Path -LiteralPath (Join-Path $androidSdk 'platforms\android-35')
)
$adb = if ($androidSdk) { Join-Path $androidSdk 'platform-tools\adb.exe' } else { '' }
$adbOk = $adb -and (Test-Path -LiteralPath $adb)

$tokenPath = [string]$config.TokenFile
if (-not [System.IO.Path]::IsPathRooted($tokenPath)) {
    $tokenPath = Join-Path $projectRoot $tokenPath
}
$tokenOk = (Test-Path -LiteralPath $tokenPath) -and (
    (Get-Content -LiteralPath $tokenPath -Raw).Trim().Length -ge 32
)

$serverOk = $false
$presetCount = 0
if ($tokenOk) {
    try {
        $token = (Get-Content -LiteralPath $tokenPath -Raw).Trim()
        $baseUrl = ([string]$config.ServerAUrl).TrimEnd('/')
        $catalog = Invoke-RestMethod `
            -Uri "$baseUrl/api/v1/vehicles/$($config.VehicleId)/modes" `
            -Headers @{ Authorization = "Bearer $token" } -TimeoutSec 10
        $presetCount = @($catalog.modes | Where-Object { $_.origin -eq 'preset' }).Count
        $serverOk = $presetCount -gt 0
    } catch {
        $serverOk = $false
    } finally {
        $token = $null
    }
}

$result = [pscustomobject]@{
    Passed = [bool]($javaOk -and $platform35 -and $adbOk -and $tokenOk -and $serverOk)
    Java17OrNewer = $javaOk
    Java = $javaSummary
    AndroidSdk = $androidSdk
    AndroidPlatform35 = [bool]$platform35
    Adb = [bool]$adbOk
    DeviceToken = [bool]$tokenOk
    ServerA = [bool]$serverOk
    PresetModes = $presetCount
}
$result
if (-not $result.Passed) { exit 2 }