#requires -Version 5

param(
    [string]$RepoRoot = (Resolve-Path (Join-Path $PSScriptRoot "..\..")).Path,
    [string]$AndroidHome = $env:ANDROID_HOME,
    [switch]$SetEnvironment,
    [switch]$InstallMissing
)

$ErrorActionPreference = "Stop"

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

function Get-CommandPath([string]$Name) {
    $cmd = Get-Command $Name -ErrorAction SilentlyContinue
    if ($null -eq $cmd) { return $null }
    return $cmd.Source
}

function Parse-AndroidCompileVersion([string]$AndroidProjectDir) {
    $buildFile = Join-Path $AndroidProjectDir "app\build.gradle"
    if (-not (Test-Path $buildFile)) {
        return $null
    }

    $content = Get-Content $buildFile -Raw
    $compileMatch = [regex]::Match($content, '(?m)^\s*compileSdk\s+([0-9]+)\s*$')
    if ($compileMatch.Success) { return $compileMatch.Groups[1].Value }
    return $null
}

function Get-AndroidSdkHome([string]$CandidateHome) {
    $candidates = @(
        $CandidateHome,
        "C:\Android\Sdk",
        "$env:LOCALAPPDATA\Android\Sdk",
        "$env:USERPROFILE\AppData\Local\Android\Sdk"
    ) | Where-Object { $_ -and (Test-Path $_) } | Select-Object -Unique

    foreach ($candidate in $candidates) {
        if ((Test-Path (Join-Path $candidate "platform-tools")) -and (Test-Path (Join-Path $candidate "platforms"))) {
            return $candidate
        }
    }

    if ($candidates.Count -gt 0) { return $candidates[0] }
    return $null
}

Write-Host "=== RAP: подготовка Android среды сборки ==="
$repoRoot = (Resolve-Path $RepoRoot).ProviderPath
if (-not $repoRoot) {
    Fail "RepoRoot не найден: $RepoRoot"
}

$androidProject = Join-Path $repoRoot "clients\android"
if (-not (Test-Path $androidProject)) {
    Fail "Не найден проект clients\android: $androidProject"
}

$compileSdk = Parse-AndroidCompileVersion $androidProject
if ([string]::IsNullOrWhiteSpace($compileSdk)) {
    $compileSdk = "35"
}

$java = Get-CommandPath "java"
if (-not $java) {
    Write-Host "Не найден java в PATH. Установи JDK 17+: winget install EclipseAdoptium.Temurin.17.JDK или choco install temurin17"
    Fail "Зависимость Java отсутствует."
}
$javaVersion = (& $java -version 2>&1 | Select-Object -First 1)
if ($javaVersion -match 'version\s+"(\d+)\.' ) {
    $major = [int]$matches[1]
    Write-Host "Java: $java ($major)"
    if ($major -lt 17) {
        Write-Host "Найден Java $major, нужен JDK 17+."
        Fail "Нужен Java 17 или новее."
    }
} else {
    Write-Host "Java найден, версия не распознана: $javaVersion"
}

$gradle = Get-CommandPath "gradle"
if (-not $gradle) {
    Write-Host "Не найден gradle в PATH. Установи: winget install Gradle.Gradle / choco install gradle"
    Fail "Зависимость Gradle отсутствует."
}
Write-Host "Gradle: $gradle"

$sdkRoot = Get-AndroidSdkHome $AndroidHome
if (-not $sdkRoot) {
    Write-Host "Не найден Android SDK. Укажи -AndroidHome или установи SDK в C:\Android\Sdk."
    Fail "Android SDK не найден."
}
Write-Host "Android SDK: $sdkRoot"

$cmdlineTools = Join-Path $sdkRoot "cmdline-tools\latest\bin\sdkmanager.bat"
if (-not (Test-Path $cmdlineTools)) {
    Write-Host "Не найден Android cmdline-tools ($cmdlineTools)."
    Write-Host "Установи Android SDK Command-line Tools через Android Studio или вручную скачай SDK Manager."
    Fail "cmdline-tools не найдены."
}
Write-Host "sdkmanager: $cmdlineTools"

Write-Host "Поддерживаем compileSdk: $compileSdk"

$requiredComponents = @(
    "platform-tools",
    "platforms;android-$compileSdk",
    "build-tools;35.0.1"
)
$missingComponents = @()
foreach ($component in $requiredComponents) {
    switch -Regex ($component) {
        "^platform-tools$" {
            if (-not (Test-Path (Join-Path $sdkRoot "platform-tools"))) { $missingComponents += $component }
        }
        "^platforms;android-(?<api>\d+)$" {
            if (-not (Test-Path (Join-Path $sdkRoot "platforms\android-$($Matches["api"])"))) { $missingComponents += $component }
        }
        "^build-tools;(?<bt>.+)$" {
            if (-not (Test-Path (Join-Path $sdkRoot "build-tools\$($Matches["bt"])"))) { $missingComponents += $component }
        }
        default { }
    }
}

if ($missingComponents.Count -gt 0) {
    Write-Host ""
    Write-Host "Отсутствуют компоненты Android SDK:"
    $missingComponents | ForEach-Object { Write-Host " - $_" }
    Write-Host ""
    $installCmd = "& `"$cmdlineTools`" --sdk_root=`"$sdkRoot`" --install $($missingComponents -join ' ')"
    Write-Host "Команда установки:"
    Write-Host "  $installCmd"
    if ($InstallMissing) {
        Write-Host "Запускаю установку отсутствующих компонентов..."
        & $cmdlineTools --sdk_root=$sdkRoot --install $missingComponents
        if ($LASTEXITCODE -ne 0) {
            Fail "Не удалось установить компоненты через sdkmanager."
        }
        Write-Host "Компоненты установлены."
    } else {
        Write-Host "Добавь -InstallMissing для автo-установки."
    }
} else {
    Write-Host "Все базовые компоненты SDK присутствуют."
}

if ($SetEnvironment) {
    [Environment]::SetEnvironmentVariable("ANDROID_HOME", $sdkRoot, "User")
    [Environment]::SetEnvironmentVariable("ANDROID_SDK_ROOT", $sdkRoot, "User")
    Write-Host "Персистентные переменные ANDROID_HOME/ANDROID_SDK_ROOT сохранены для текущего пользователя."
}

Write-Host ""
Write-Host "Рекомендуется в текущей сессии:"
Write-Host "  `$env:ANDROID_HOME='$sdkRoot'"
Write-Host "  `$env:ANDROID_SDK_ROOT='$sdkRoot'"

Write-Host ""
Write-Host "Готово. После этого запуск:"
Write-Host "  pwsh -ExecutionPolicy Bypass -File scripts\\android\\build-android-apk.ps1"