<?php

namespace App\Http\Controllers\api;

use App\Http\Controllers\Controller;
use App\Models\Law;
use App\Models\Notification;
use App\Models\Category;
use App\Models\RecentArt;
use App\Models\SubscribePlan;
use App\Models\UserSubscriber;
use App\Services\AppMarketPurchaseVerifier;
use App\Traits\BaseApiResponse;
use Illuminate\Support\Facades\Cache;

class HomeController extends Controller
{
    use BaseApiResponse;

    public function __construct(private AppMarketPurchaseVerifier $marketVerifier)
    {
    }

    public function homeV2()
    {
        $user = auth()->user();

        // 1. Check and grant 30-day free subscription if eligible
        $this->checkAndGrantFreeSubscription($user);

        $this->refreshMarketSubscriptionAfterResponse($user);

        $recent = RecentArt::query()->where('user_id', $user->id)->get()->map(function ($q) {
            return [
                'id' => $q->law?->id,
                'name' => $q->law?->title,
                'is_locked' => $q->law?->is_locked,
            ];
        });

        $laws = Law::orderBy('created_at')->get()->map(function ($q) {
            return [
                'id' => $q->id,
                'name' => $q->title,
                'is_locked' => $q->is_locked,
            ];
        });

        $categories = ['hagigi', 'kifari'];
        $lawsByCategory = [];

        foreach ($categories as $category) {
            $lawsByCategory[$category] = Law::whereHas('category', function ($q) use ($category) {
                $q->where('type', $category);
            })->get()->map(function ($q) {
                return [
                    'id' => $q->id,
                    'title' => $q->title,
                    'is_locked' => $q->is_locked,
                    'category_id' => $q->category_id,
                    'price' => $q->price,
                    'image' => $q->image,
                    'type' => 'law',
                ];
            });
        }

        $free_law = Law::where('is_locked', false)->orderBy('created_at')->get()->map(function ($q) {
            return [
                'id' => $q->id,
                'name' => $q->title,
                'is_locked' => $q->is_locked,
            ];
        });

        // 2. Fetch Active Subscription & Calculate Remaining Days
        $activeSubscribers = $user->userSubscribers()
            ->with('subscribe')
            ->where('expired_at', '>=', now())
            ->get();

        $current_plan = null;

        if ($activeSubscribers->isNotEmpty()) {
            $latestSubscription = $activeSubscribers->sortByDesc('expired_at')->first();
            $expiredDays = $activeSubscribers->sum(function ($subscriber) {
                return $subscriber->expired_at->diffInDays(now());
            });

            // Accurately check if the active plan is free
            $isFree = (bool) (
                $latestSubscription->is_free ||
                ($latestSubscription->subscribe && $latestSubscription->subscribe->is_free)
            );

            $current_plan = [
                'id' => $latestSubscription->id,
                'name' => $latestSubscription->subscribe->name ?? 'Subscription',
                'price' => $latestSubscription->subscribe->price ?? 0,
                'expired_day' => $expiredDays,
                'is_free' => $isFree,
            ];
        }

        $unread_notifications_count = Notification::unreadForUser($user->id)->count();

        $homeData = [
            'recent' => $recent,
            'laws' => $lawsByCategory,
            'last_law' => $laws,
            'free' => $free_law,
            'current_plan' => $current_plan,
            'unread_notifications_count' => $unread_notifications_count,
        ];

        return $this->success([
            'home' => $homeData,
            'hoqoqi_list' => $this->getCategoryList(1),
            'keyfari_list' => $this->getCategoryList(2),
        ]);
    }

    private function getCategoryList(int $categoryId)
    {
        $type = $categoryId === 1 ? 'hagigi' : 'kifari';

        $categories = Category::with(['laws'])->where('type', $type)->get()->pluck('id');
        $items = Law::query()->whereIn('category_id', $categories)->get();

        $data = [];
        $user = auth()->user();

        foreach ($items as $item) {
            $data[] = [
                'id' => $item->id,
                'title' => $item->title,
                'number' => $item->number,
                'type' => 'laws',
                'is_locked' => $user->isSubscriber() !== false ? false : Law::where('id', $item->id)->first()?->is_locked,
                'image' => $item?->image,
                'law' => $item?->title,
                'count_art' => $item->arts->count(),
                'count_volums' => $item->volums->count(),
                'price' => $item->price,
            ];
        }

        return $data;
    }

    public function index()
    {
        $user = auth()->user();

        // 1. Check and grant 30-day free subscription if eligible
        $this->checkAndGrantFreeSubscription($user);

        $this->refreshMarketSubscriptionAfterResponse($user);

        $recent = RecentArt::query()->where('user_id', $user->id)->get()->map(function ($q) {
            return [
                'id' => $q->law?->id,
                'name' => $q->law?->title,
                'is_locked' => $q->law?->is_locked,
            ];
        });

        $laws = Law::orderBy('created_at')->get()->map(function ($q) {
            return [
                'id' => $q->id,
                'name' => $q->title,
                'is_locked' => $q->is_locked,
            ];
        });

        $categories = ['hagigi', 'kifari'];
        $lawsByCategory = [];

        foreach ($categories as $category) {
            $lawsByCategory[$category] = Law::whereHas('category', function ($q) use ($category) {
                $q->where('type', $category);
            })->get()->map(function ($q) {
                return [
                    'id' => $q->id,
                    'title' => $q->title,
                    'is_locked' => $q->is_locked,
                    'category_id' => $q->category_id,
                    'price' => $q->price,
                    'image' => $q->image,
                    'type' => 'law',
                ];
            });
        }

        $free_law = Law::where('is_locked', false)->orderBy('created_at')->get()->map(function ($q) {
            return [
                'id' => $q->id,
                'name' => $q->title,
                'is_locked' => $q->is_locked,
            ];
        });

        // 2. Fetch Active Subscription & Calculate Remaining Days
        $activeSubscribers = $user->userSubscribers()
            ->with('subscribe')
            ->where('expired_at', '>=', now())
            ->get();

        $current_plan = null;

        if ($activeSubscribers->isNotEmpty()) {
            $latestSubscription = $activeSubscribers->sortByDesc('expired_at')->first();
            $expiredDays = $activeSubscribers->sum(function ($subscriber) {
                return $subscriber->expired_at->diffInDays(now());
            });

            // Accurately check if the active plan is free
            $isFree = (bool) (
                $latestSubscription->is_free ||
                ($latestSubscription->subscribe && $latestSubscription->subscribe->is_free)
            );

            $current_plan = [
                'id' => $latestSubscription->id,
                'name' => $latestSubscription->subscribe->name ?? 'Subscription',
                'price' => $latestSubscription->subscribe->price ?? 0,
                'expired_day' => $expiredDays,
                'is_free' => $isFree,
            ];
        }

        $unread_notifications_count = Notification::unreadForUser($user->id)->count();

        return $this->success([
            'recent' => $recent,
            'laws' => $lawsByCategory,
            'last_law' => $laws,
            'free' => $free_law,
            'current_plan' => $current_plan,
            'unread_notifications_count' => $unread_notifications_count,
        ]);
    }

    /**
     * Helper to automatically assign a free plan if the user has never had one.
     */
    private function checkAndGrantFreeSubscription($user): void
    {
        $hasUsedFreePlan = $user->userSubscribers()
            ->whereHas('subscribe', function ($query) {
                $query->where('is_free', true);
            })->exists();

        if (!$hasUsedFreePlan) {
            $freePlan = SubscribePlan::where('is_free', true)->where('is_active', true)->first();

            if ($freePlan) {
                $user->userSubscribers()->create([
                    'subscribe_plan_id' => $freePlan->id,
                    'expired_at' => now()->addDays($freePlan->expired_day + 1),
                ]);
            }
        }
    }

    private function refreshMarketSubscriptionAfterResponse($user): void
    {
        $cacheKey = "home-market-refresh-user-{$user->id}";
        $this->refreshMarketSubscription($user);

        if (!Cache::add($cacheKey, true, now()->addHours(24))) {
            return;
        }

        app()->terminating(function () use ($user) {
            $this->refreshMarketSubscription($user);
        });
    }

    private function refreshMarketSubscription($user): void
    {
        $bazaarSubscription = $user->userSubscribers()
            ->whereNotNull('purchase_token')
            ->whereNotNull('subscription_id')
            ->where(function ($query) {
                $query->where('market_provider', 'bazaar')
                    ->orWhereNull('market_provider');
            })
            ->latest()
            ->first();

        if ($bazaarSubscription && $this->shouldRefreshMarketSubscription($bazaarSubscription) && $this->marketVerifier->refreshBazaarSubscriber($bazaarSubscription)) {
            return;
        }

        $myketSubscription = $user->userSubscribers()
            ->where('market_provider', 'myket')
            ->whereNotNull('purchase_token')
            ->whereNotNull('product_id')
            ->latest()
            ->first();

        if ($myketSubscription && $this->shouldRefreshMarketSubscription($myketSubscription)) {
            $this->marketVerifier->refreshMyketSubscriber($myketSubscription);
        }
    }

    private function shouldRefreshMarketSubscription(UserSubscriber $subscriber): bool
    {
        if ($subscriber->expired_at && $subscriber->expired_at->lessThanOrEqualTo(now())) {
            return true;
        }

        return !$subscriber->last_verified_at || $subscriber->last_verified_at->lessThan(now()->subHours(12));
    }
}