$ErrorActionPreference = "Stop"

function Resolve-PhpCommand {
    $phpCommand = Get-Command php -ErrorAction SilentlyContinue
    if ($phpCommand) {
        return "php"
    }

    $candidates = @(
        "D:\\xampp\\php\\php.exe",
        "C:\\xampp\\php\\php.exe",
        "C:\\wamp64\\bin\\php\\php8.3.0\\php.exe",
        "C:\\wamp64\\bin\\php\\php8.2.0\\php.exe",
        "C:\\wamp64\\bin\\php\\php8.1.0\\php.exe"
    )

    foreach ($candidate in $candidates) {
        if (Test-Path $candidate) {
            return $candidate
        }
    }

    return $null
}

if (-not (Test-Path "./mediawiki/composer.json")) {
    Write-Error "Missing ./mediawiki/composer.json. Run 'npm run mw:init' first."
}

$php = Resolve-PhpCommand
if (-not $php) {
    Write-Error "PHP executable not found. Install XAMPP/WampServer or add php.exe to PATH."
}

if (-not (Test-Path "./composer.phar")) {
    Write-Host "Downloading Composer locally (composer.phar)..."
    & $php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
    if (-not (Test-Path "./composer-setup.php")) {
        Write-Error "Could not download Composer installer."
    }
    & $php .\composer-setup.php --filename=composer.phar
    Remove-Item .\composer-setup.php -ErrorAction SilentlyContinue
}

Write-Host "Checking required PHP extensions..."
$loadedExtensions = (& $php -m) | ForEach-Object { $_.Trim().ToLower() }
$requiredExtensions = @("intl")
$missing = @()

foreach ($ext in $requiredExtensions) {
    if ($loadedExtensions -notcontains $ext) {
        $missing += $ext
    }
}

if ($missing.Count -gt 0) {
    Write-Error "Missing PHP extension(s): $($missing -join ', '). Enable them in php.ini and restart dev server."
}

Write-Host "Installing MediaWiki Composer dependencies..."
& $php .\composer.phar --working-dir=mediawiki install --no-dev --prefer-dist --optimize-autoloader

Write-Host "MediaWiki dependencies are installed."