<?php

namespace App\Services;

use App\Models\Category;
use App\Models\Product;
use Illuminate\Support\Collection;

class CategoryService
{
    /** دسته‌هایی که صریحاً غیرفعال شده‌اند — بقیه (بدون ردیف) نمایش داده می‌شوند */
    public function hiddenCategoryNames(): Collection
    {
        return Category::query()
            ->where('active', 0)
            ->pluck('name');
    }

    public function filterProductsByVisibleCategories(Collection $products): Collection
    {
        $hidden = $this->hiddenCategoryNames();
        if ($hidden->isEmpty()) {
            return $products;
        }

        return $products->filter(function ($product) use ($hidden) {
            $group = trim((string) ($product->group_type ?? ''));
            if ($group === '') {
                return true;
            }

            if (! Category::where('name', $group)->exists()) {
                return true;
            }

            return ! $hidden->contains($group);
        })->values();
    }

    public function sortProductsForStore(Collection $products): Collection
    {
        return $products
            ->sort(function ($a, $b) {
                $aInStock = (int) ($a->inventory ?? 0) > 0 ? 0 : 1;
                $bInStock = (int) ($b->inventory ?? 0) > 0 ? 0 : 1;
                if ($aInStock !== $bInStock) {
                    return $aInStock <=> $bInStock;
                }

                return ((int) ($b->inventory ?? 0)) <=> ((int) ($a->inventory ?? 0));
            })
            ->values();
    }

    public function syncFromProducts(): int
    {
        $names = Product::query()
            ->whereNotNull('group_type')
            ->where('group_type', '!=', '')
            ->distinct()
            ->orderBy('group_type')
            ->pluck('group_type');

        $created = 0;
        $order = (int) Category::max('sort_order');

        foreach ($names as $name) {
            $name = trim((string) $name);
            if ($name === '') {
                continue;
            }

            if (Category::where('name', $name)->exists()) {
                continue;
            }

            $order++;
            Category::create([
                'name' => $name,
                'active' => 1,
                'show_in_filter' => 1,
                'show_in_select' => 1,
                'sort_order' => $order,
            ]);
            $created++;
        }

        return $created;
    }
}