<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;
use Laravel\Pennant\Feature;

class FeatureFlagController extends Controller
{
    /**
     * Display a listing of feature flags.
     */
    public function index()
    {
        // Get all feature flag classes from app/Features directory
        $featurePath = app_path('Features');
        $features = [];

        if (File::isDirectory($featurePath)) {
            $files = File::files($featurePath);

            foreach ($files as $file) {
                $className = 'App\\Features\\' . $file->getFilenameWithoutExtension();

                if (class_exists($className)) {
                    $featureName = $this->getFeatureName($className);

                    // Get the current state for null scope (global)
                    $isActive = Feature::for(null)->active($featureName);

                    $features[] = [
                        'name' => $featureName,
                        'class' => $className,
                        'is_active' => $isActive,
                        'description' => $this->getFeatureDescription($className),
                    ];
                }
            }
        }

        // Sort features by name
        usort($features, fn($a, $b) => strcmp($a['name'], $b['name']));

        return view('admin.feature-flags.index', compact('features'));
    }

    /**
     * Toggle a feature flag on or off.
     */
    public function toggle(Request $request)
    {
        $validated = $request->validate([
            'feature' => ['required', 'string'],
            'active' => ['required', 'boolean'],
        ]);

        $featureName = $validated['feature'];

        // Activate or deactivate the feature for null scope (global)
        if ($validated['active']) {
            Feature::for(null)->activate($featureName);
            $message = "Feature '{$featureName}' has been activated.";
        } else {
            Feature::for(null)->deactivate($featureName);
            $message = "Feature '{$featureName}' has been deactivated.";
        }

        return redirect()->route('admin.feature-flags.index')
            ->with('success', $message);
    }

    /**
     * Purge a feature flag (remove all stored values).
     */
    public function purge(Request $request)
    {
        $validated = $request->validate([
            'feature' => ['required', 'string'],
        ]);

        $featureName = $validated['feature'];

        Feature::purge($featureName);

        return redirect()->route('admin.feature-flags.index')
            ->with('success', "Feature '{$featureName}' has been purged from storage.");
    }

    /**
     * Get the feature name from the class.
     */
    private function getFeatureName(string $className): string
    {
        // Check if class has Name attribute
        $reflection = new \ReflectionClass($className);
        $attributes = $reflection->getAttributes(\Laravel\Pennant\Attributes\Name::class);

        if (!empty($attributes)) {
            $nameAttribute = $attributes[0]->newInstance();
            return $nameAttribute->name;
        }

        // Default to class basename
        return class_basename($className);
    }

    /**
     * Get the feature description from class docblock.
     */
    private function getFeatureDescription(string $className): ?string
    {
        $reflection = new \ReflectionClass($className);
        $docComment = $reflection->getDocComment();

        if ($docComment) {
            // Extract the first line of the docblock as description
            preg_match('/\/\*\*\s*\n\s*\*\s*(.+?)\n/s', $docComment, $matches);
            if (isset($matches[1])) {
                return trim($matches[1]);
            }
        }

        return null;
    }
}