<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Carbon\Carbon;
use DateTimeZone;

class TimezoneController extends Controller
{
    public function index()
    {
        $currentTimezone = config('app.timezone');
        $currentTime = Carbon::now();
        $availableTimezones = $this->getAvailableTimezones();
        
        return view('user.timezone', compact('currentTimezone', 'currentTime', 'availableTimezones'));
    }

    public function update(Request $request)
    {
        $timezone = $request->input('timezone');
        
        // Validate timezone
        if (!in_array($timezone, DateTimeZone::listIdentifiers())) {
            return redirect()->back()->with('error', 'Timezone tidak valid!');
        }

        // Update .env file
        $this->updateEnvFile('APP_TIMEZONE', $timezone);
        
        // Clear config cache
        \Artisan::call('config:clear');
        
        return redirect()->back()->with('success', 'Timezone berhasil diperbarui ke ' . $timezone);
    }

    public function getCurrentTime()
    {
        $timezone = request('timezone', config('app.timezone'));
        $currentTime = Carbon::now($timezone);
        
        return response()->json([
            'timezone' => $timezone,
            'current_time' => $currentTime->format('Y-m-d H:i:s'),
            'formatted_time' => $currentTime->format('d M Y H:i:s'),
            'day_name' => $currentTime->format('l'),
            'time_only' => $currentTime->format('H:i:s'),
            'date_only' => $currentTime->format('d M Y')
        ]);
    }

    private function getAvailableTimezones()
    {
        $timezones = [
            'Asia/Jakarta' => 'WIB (UTC+7)',
            'Asia/Makassar' => 'WITA (UTC+8)',
            'Asia/Jayapura' => 'WIT (UTC+9)',
            'UTC' => 'UTC (UTC+0)',
            'Asia/Singapore' => 'Singapore (UTC+8)',
            'Asia/Kuala_Lumpur' => 'Malaysia (UTC+8)',
            'Asia/Bangkok' => 'Thailand (UTC+7)',
            'Asia/Manila' => 'Philippines (UTC+8)',
            'Asia/Ho_Chi_Minh' => 'Vietnam (UTC+7)',
            'Asia/Seoul' => 'Korea (UTC+9)',
            'Asia/Tokyo' => 'Japan (UTC+9)',
            'Asia/Shanghai' => 'China (UTC+8)',
            'America/New_York' => 'New York (UTC-5)',
            'America/Los_Angeles' => 'Los Angeles (UTC-8)',
            'Europe/London' => 'London (UTC+0)',
            'Europe/Paris' => 'Paris (UTC+1)',
            'Europe/Berlin' => 'Berlin (UTC+1)',
            'Australia/Sydney' => 'Sydney (UTC+10)',
            'Australia/Perth' => 'Perth (UTC+8)',
        ];

        return $timezones;
    }

    private function updateEnvFile($key, $value)
    {
        $path = base_path('.env');
        
        if (file_exists($path)) {
            $content = file_get_contents($path);
            
            // Check if key exists
            if (strpos($content, $key . '=') !== false) {
                // Update existing key
                $content = preg_replace(
                    '/^' . $key . '=.*/m',
                    $key . '=' . $value,
                    $content
                );
            } else {
                // Add new key
                $content .= "\n" . $key . '=' . $value;
            }
            
            file_put_contents($path, $content);
        }
    }
}