<?php

namespace App\Http\Controllers\Admin;

use App\DB\Te\TableEngine;
use App\Http\Controllers\Controller;
use App\Models\Customer;
use App\Models\CustomerSpecialPricePackage;
use App\Models\Product;
use App\Services\ConfigService;
use App\Services\CustomerSpecialPricingService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;

class CustomerSpecialPricePackageController extends Controller
{
    public function table(Request $request)
    {
        $this->assertFeatureEnabled();

        $query = CustomerSpecialPricePackage::query()
            ->withCount(['customers', 'products'])
            ->orderByDesc('id');

        TableEngine::create($query, $request->all())
            ->initSearch(['title'])
            ->select(['*'])
            ->export($query);

        return $query;
    }

    public function show(int $id)
    {
        $this->assertFeatureEnabled();

        $package = CustomerSpecialPricePackage::query()
            ->with([
                'customers:id,name,mobile',
                'products:id,title,group_type',
            ])
            ->findOrFail($id);

        $categoryNames = [];
        if (Schema::hasTable('customer_special_price_package_category')) {
            $categoryNames = DB::table('customer_special_price_package_category')
                ->where('package_id', $package->id)
                ->pluck('category_name')
                ->all();
        }

        return response()->json([
            'package' => $package,
            'customer_ids' => $package->customers->pluck('id')->values(),
            'product_ids' => $package->products->pluck('id')->values(),
            'category_names' => array_values($categoryNames),
            'customers' => $package->customers,
            'products' => $package->products,
        ]);
    }

    public function store(Request $request)
    {
        $this->assertFeatureEnabled();
        $data = $this->validatedPayload($request);

        $warnings = app(CustomerSpecialPricingService::class)->overlapWarnings(
            $data['customer_ids'],
            $data['product_ids']
        );

        $package = DB::transaction(function () use ($data) {
            $package = CustomerSpecialPricePackage::create([
                'title' => $data['title'],
                'profit_buy' => $data['profit_buy'],
                'profit_sell' => $data['profit_sell'],
                'show_product' => $data['show_product'],
                'is_active' => $data['is_active'],
            ]);
            $this->syncRelations($package, $data);

            return $package->fresh();
        });

        return response()->json([
            'message' => 'پکیج قیمت ویژه ثبت شد.',
            'package' => $package,
            'warnings' => $warnings,
        ]);
    }

    public function update(Request $request, int $id)
    {
        $this->assertFeatureEnabled();
        $package = CustomerSpecialPricePackage::findOrFail($id);
        $data = $this->validatedPayload($request);

        $warnings = app(CustomerSpecialPricingService::class)->overlapWarnings(
            $data['customer_ids'],
            $data['product_ids'],
            (int) $package->id
        );

        DB::transaction(function () use ($package, $data) {
            $package->update([
                'title' => $data['title'],
                'profit_buy' => $data['profit_buy'],
                'profit_sell' => $data['profit_sell'],
                'show_product' => $data['show_product'],
                'is_active' => $data['is_active'],
            ]);
            $this->syncRelations($package, $data);
        });

        return response()->json([
            'message' => 'پکیج قیمت ویژه به‌روز شد.',
            'package' => $package->fresh(),
            'warnings' => $warnings,
        ]);
    }

    public function destroy(int $id)
    {
        $this->assertFeatureEnabled();
        $package = CustomerSpecialPricePackage::findOrFail($id);

        DB::transaction(function () use ($package) {
            $package->customers()->detach();
            $package->products()->detach();
            if (Schema::hasTable('customer_special_price_package_category')) {
                DB::table('customer_special_price_package_category')->where('package_id', $package->id)->delete();
            }
            $package->delete();
        });

        return response()->json(['message' => 'پکیج حذف شد.']);
    }

    public function toggleActive(int $id)
    {
        $this->assertFeatureEnabled();
        $package = CustomerSpecialPricePackage::findOrFail($id);
        $package->is_active = ! $package->is_active;
        $package->save();

        return response()->json([
            'message' => $package->is_active ? 'پکیج فعال شد.' : 'پکیج غیرفعال شد.',
            'is_active' => $package->is_active,
        ]);
    }

    public function searchCustomers(Request $request)
    {
        $this->assertFeatureEnabled();
        $q = trim((string) $request->get('q', ''));

        $rows = Customer::query()
            ->where('type', 2)
            ->where(function ($query) {
                $query->where('is_archive', false)->orWhereNull('is_archive');
            })
            ->when($q !== '', function ($query) use ($q) {
                $query->where(function ($inner) use ($q) {
                    $inner->where('name', 'like', '%' . $q . '%')
                        ->orWhere('mobile', 'like', '%' . $q . '%')
                        ->orWhere('id', $q);
                });
            })
            ->orderByDesc('id')
            ->limit(40)
            ->get(['id', 'name', 'mobile']);

        return response()->json(['customers' => $rows]);
    }

    public function productsByCategories(Request $request)
    {
        $this->assertFeatureEnabled();
        $names = array_values(array_filter(array_map('strval', (array) $request->input('category_names', []))));

        if ($names === []) {
            return response()->json(['products' => []]);
        }

        $products = Product::query()
            ->whereIn('group_type', $names)
            ->orderBy('title')
            ->get(['id', 'title', 'group_type', 'active']);

        return response()->json(['products' => $products]);
    }

    private function validatedPayload(Request $request): array
    {
        $title = trim((string) $request->input('title', ''));
        if ($title === '') {
            throw new UnprocessableEntityHttpException('عنوان پکیج الزامی است.');
        }

        $customerIds = array_values(array_unique(array_filter(array_map('intval', (array) $request->input('customer_ids', [])))));
        $productIds = array_values(array_unique(array_filter(array_map('intval', (array) $request->input('product_ids', [])))));
        $categoryNames = array_values(array_unique(array_filter(array_map(
            fn ($n) => trim((string) $n),
            (array) $request->input('category_names', [])
        ))));

        if ($customerIds === []) {
            throw new UnprocessableEntityHttpException('حداقل یک کاربر انتخاب کنید.');
        }
        if ($categoryNames === []) {
            throw new UnprocessableEntityHttpException('حداقل یک گروه دسته‌بندی انتخاب کنید.');
        }
        if ($productIds === []) {
            throw new UnprocessableEntityHttpException('حداقل یک محصول انتخاب کنید.');
        }

        $profitBuy = $this->parseSignedRial($request->input('profit_buy', 0));
        $profitSell = $this->parseSignedRial($request->input('profit_sell', 0));

        return [
            'title' => $title,
            'customer_ids' => $customerIds,
            'product_ids' => $productIds,
            'category_names' => $categoryNames,
            'profit_buy' => $profitBuy,
            'profit_sell' => $profitSell,
            'show_product' => filter_var($request->input('show_product', true), FILTER_VALIDATE_BOOLEAN),
            'is_active' => filter_var($request->input('is_active', true), FILTER_VALIDATE_BOOLEAN),
        ];
    }

    private function parseSignedRial(mixed $value): int
    {
        $raw = trim((string) $value);
        $raw = str_replace(["\u{066C}", ',', '٬', ' ', 'ریال'], '', $raw);
        $raw = strtr($raw, [
            '۰' => '0', '۱' => '1', '۲' => '2', '۳' => '3', '۴' => '4',
            '۵' => '5', '۶' => '6', '۷' => '7', '۸' => '8', '۹' => '9',
            '٠' => '0', '١' => '1', '٢' => '2', '٣' => '3', '٤' => '4',
            '٥' => '5', '٦' => '6', '٧' => '7', '٨' => '8', '٩' => '9',
            '−' => '-', '–' => '-', '—' => '-',
        ]);

        $negative = str_starts_with($raw, '-');
        $digits = preg_replace('/\D/', '', $raw) ?? '0';
        $amount = (int) ($digits === '' ? '0' : $digits);

        return $negative ? -$amount : $amount;
    }

    private function syncRelations(CustomerSpecialPricePackage $package, array $data): void
    {
        $package->customers()->sync($data['customer_ids']);
        $package->products()->sync($data['product_ids']);

        if (Schema::hasTable('customer_special_price_package_category')) {
            DB::table('customer_special_price_package_category')->where('package_id', $package->id)->delete();
            $rows = [];
            foreach ($data['category_names'] as $name) {
                $rows[] = [
                    'package_id' => $package->id,
                    'category_name' => $name,
                ];
            }
            if ($rows !== []) {
                DB::table('customer_special_price_package_category')->insert($rows);
            }
        }
    }

    private function assertFeatureEnabled(): void
    {
        if (! app(CustomerSpecialPricingService::class)->tablesReady()) {
            throw new UnprocessableEntityHttpException('جدول پکیج قیمت ویژه وجود ندارد. مایگریشن را اجرا کنید.');
        }

        if (! app(ConfigService::class)->getBool(CustomerSpecialPricingService::SETTING_KEY, false)) {
            throw new UnprocessableEntityHttpException('قابلیت قیمت ویژه مشتری غیرفعال است.');
        }
    }
}