<?php

namespace App\Observers;

use App\Models\Package;
use App\Models\Currency;
use App\Enums\PackageType;
use App\Models\Restaurant;
use App\Models\GlobalInvoice;
use App\Models\GlobalSubscription;
use App\Models\NotificationSetting;
use App\Models\PaymentGatewayCredential;
use App\Models\GlobalCurrency;
use App\Models\PredefinedAmount;
use App\Models\OfflinePaymentMethod;
use App\Models\RestaurantEuAllergenSetting;
use App\Events\NewRestaurantCreatedEvent;

class RestaurantObserver
{

    public function saving(Restaurant $restaurant): void
    {
        if ($restaurant->isDirty('name')) {
            $restaurant->hash = $this->createUniqueSlug($restaurant);
        }

        if (!is_null($restaurant->address)) {
            $restaurant->address = strip_tags($restaurant->address);
        }

        if ($restaurant->isDirty(['package_id', 'package_type', 'license_expire_on'])) {
            clearRestaurantModulesCache($restaurant->id);
        }

        if ($restaurant->isDirty('package_id')) {

            if (in_array('Sms', restaurant_modules()) && module_enabled('Sms')) {

                $oldPackageId = $restaurant->getOriginal('package_id');
                $oldPackage   = Package::find($oldPackageId);
                $newPackage   = Package::find($restaurant->package_id);

                $totalSms = $newPackage?->sms_count ?? 0;

                if ($oldPackage && $newPackage && $oldPackage->sms_count != -1 && $newPackage->sms_count != -1 && $newPackage->carry_forward_sms) {
                    $remaining = max(0, ($restaurant->getOriginal('total_sms') ?? 0) - ($restaurant->getOriginal('count_sms') ?? 0));

                    $totalSms = $remaining + $newPackage->sms_count;
                }

                $restaurant->total_sms = $totalSms;

                $restaurant->count_sms = 0;
            }

            // Update order limits for all branches when package changes
            $newPackage = Package::find($restaurant->package_id);
            if ($newPackage) {
                $orderLimit = $newPackage->order_limit ?? -1;
                // Update all branches' total_orders and reset count_orders
                $restaurant->branches->each(function ($branch) use ($orderLimit) {
                    $branch->total_orders = $orderLimit;
                    $branch->count_orders = 0;
                    $branch->saveQuietly();
                    
                    // Clear branch order stats cache
                    cache()->forget('branch_' . $branch->id . '_order_stats');
                });
                cache()->forget('restaurant_' . $restaurant->id . '_menu_item_stats');
                cache()->forget('restaurant_' . $restaurant->id . '_staff_stats');  
            }

        }
    }

    public function created(Restaurant $restaurant)
    {
        // Set default language for new restaurant
        $restaurant->update(['customer_site_language' => 'en']);

        // Add Payment Gateway Settings
        PaymentGatewayCredential::create(['restaurant_id' => $restaurant->id]);

        RestaurantEuAllergenSetting::firstOrCreate(
            ['restaurant_id' => $restaurant->id],
            ['enabled' => false, 'allergen_keys' => null]
        );

        // Add default offline payment methods (cash and bank_transfer) with inactive status
        $this->addDefaultOfflinePaymentMethods($restaurant);

        // Add Currencies
        $this->addCurrencies($restaurant);

        // Add Notification Settings
        $this->addNotificationSettings($restaurant);

        // Create Subscription
        $this->createSubscription($restaurant);

        // Add predefined amounts
        $this->addPredefinedAmounts($restaurant);

        // Will be used in various module
        event(new NewRestaurantCreatedEvent($restaurant));
    }

    private function createSubscription($restaurant)
    {
        // Check if a trial package exists and trial status is active (1 or true)
        $trialPackage = Package::firstWhere('package_type', 'trial');
        $isTrialActive = $trialPackage && $trialPackage->trial_status == 1;

        // Assign either trial package or default package
        $package = $isTrialActive ? $trialPackage : Package::firstWhere('package_type', PackageType::DEFAULT);

        // Update restaurant package details
        $restaurant->update([
            'package_id' => $package->id,
            'package_type' => $isTrialActive ? 'trial' : 'monthly',
            'trial_ends_at' => $isTrialActive ? now()->addDays((int)$trialPackage->trial_days) : null,
            'license_expire_on' => $isTrialActive ? now()->addDays((int)$trialPackage->trial_days) : now()->addMonth(),
            'license_updated_at' => now(),
            'subscription_updated_at' => now(),
        ]);

        // Create subscription
        $subscription = GlobalSubscription::create([
            'restaurant_id' => $restaurant->id,
            'package_id' => $restaurant->package_id,
            'currency_id' => $package->currency_id,
            'package_type' => $restaurant->package_type,
            'quantity' => 1,
            'gateway_name' => 'offline',
            'subscription_status' => 'active',
            'trial_ends_at' => $isTrialActive ? $restaurant->license_expire_on : null,
            'subscribed_on_date' => $restaurant->license_updated_at,
            'ends_at' => $restaurant->license_expire_on,
            'transaction_id' => strtoupper(str()->random(15)),
        ]);

        // Create invoice
        GlobalInvoice::create([
            'restaurant_id' => $restaurant->id,
            'global_subscription_id' => $subscription->id,
            'package_id' => $subscription->package_id,
            'currency_id' => $subscription->currency_id,
            'offline_method_id' => null,
            'package_type' => $subscription->package_type,
            'total' => 0,
            'gateway_name' => 'offline',
            'status' => 'active',
            'pay_date' => $subscription->subscribed_on_date,
            'next_pay_date' => $subscription->ends_at,
            'transaction_id' => $subscription->transaction_id,
        ]);

        clearRestaurantModulesCache($restaurant->id);
    }

    public function addCurrencies($restaurant)
    {

        $globalCurrencies = GlobalCurrency::get();

        foreach ($globalCurrencies as $globalCurrency) {
            $currency = new Currency();
            $currency->currency_name = $globalCurrency->currency_name;
            $currency->currency_symbol = $globalCurrency->currency_symbol;
            $currency->currency_code = $globalCurrency->currency_code;
            $currency->restaurant_id = $restaurant->id;
            $currency->saveQuietly();
        }

        $defaultCurrency = Currency::where('currency_code', global_setting()->defaultCurrency->currency_code)->where('restaurant_id', $restaurant->id)->first();

        $restaurant->currency_id = $defaultCurrency->id;
        $restaurant->customer_site_language = 'en';

        $restaurant->save();
    }

    private function addPredefinedAmounts($restaurant)
    {
        $defaultAmounts = [50, 100, 500, 1000];

        foreach ($defaultAmounts as $amount) {
            PredefinedAmount::create([
                'restaurant_id' => $restaurant->id,
                'amount' => $amount,
            ]);
        }
    }

    public function addNotificationSettings($restaurant)
    {
        $notificationTypes = [
            [
                'type' => 'order_received',
                'send_email' => 1,
                'restaurant_id' => $restaurant->id
            ],
            [
                'type' => 'reservation_confirmed',
                'send_email' => 1,
                'restaurant_id' => $restaurant->id
            ],
            [
                'type' => 'new_reservation',
                'send_email' => 1,
                'restaurant_id' => $restaurant->id
            ],
            [
                'type' => 'order_bill_sent',
                'send_email' => 1,
                'restaurant_id' => $restaurant->id
            ],
            [
                'type' => 'staff_welcome',
                'send_email' => 1,
                'restaurant_id' => $restaurant->id
            ]
        ];

        NotificationSetting::insert($notificationTypes);
    }

    private function addDefaultOfflinePaymentMethods($restaurant)
    {
        foreach (['cash', 'bank_transfer'] as $name) {
            OfflinePaymentMethod::firstOrCreate(
                [
                    'restaurant_id' => $restaurant->id,
                    'name' => $name,
                    'description' => null,
                    'status' => 'inactive',
                ]
            );
        }
    }

    private function createUniqueSlug($restaurant)
    {
        $name = $restaurant->name;
        // Generate initial slug
        if (auth()->check()) {
            $slug = str()->slug($name, '-', auth()->user()->locale);
        } else {
            $slug = str()->slug($name, '-');
        }

        // Fallback if slug is empty or contains only hyphens (happens with non-Latin scripts)
        if (empty($slug) || trim($slug, '-') === '') {
            // Use transliteration or fallback to a unique identifier
            $slug = uniqid();
        }

        // Check if slug already exists in the database
        $count = 0;
        $originalSlug = $slug;

        while (Restaurant::where('hash', $slug)
            ->where('id', '<>', $restaurant->id)
            ->exists()
        ) {
            // Append counter to make the slug unique
            $count++;
            $slug = "{$originalSlug}-{$count}";
        }

        return $slug;
    }
}
