'use client';

import { useState, useEffect } from 'react';
import { Product, CreateProductData, UpdateProductData, PRODUCT_TYPES } from '@/types/product';
import { PlusIcon, XMarkIcon } from '@heroicons/react/24/outline';

interface ProductFormProps {
    product?: Product | null;
    packageName: string;
    onSubmit: (data: CreateProductData | UpdateProductData) => Promise<void>;
    onCancel: () => void;
    isLoading: boolean;
}

export default function ProductForm({ product, packageName, onSubmit, onCancel, isLoading }: ProductFormProps) {
    const [formData, setFormData] = useState<CreateProductData | UpdateProductData>({
        title: '',
        price: 0,
        type: 4,
        discounted_price: '',
        daily_price: '',
        discount: '',
        is_best_seller: false,
        sort_order: 0,
    });

    const [descriptions, setDescriptions] = useState<string[]>([]);
    const [newDescription, setNewDescription] = useState('');

    useEffect(() => {
        if (product) {
            setFormData({
                title: product.title || '',
                price: product.price || 0,
                type: product.type || 4,
                discounted_price: product.discounted_price || '',
                daily_price: product.daily_price || '',
                discount: product.discount || '',
                is_best_seller: product.is_best_seller || false,
                sort_order: product.sort_order || 0,
            });
            setDescriptions(product.descriptions || []);
        }
    }, [product]);

    const handleInputChange = (e: React.ChangeEvent<HTMLInputElement | HTMLSelectElement>) => {
        const { name, value, type } = e.target;
        if (type === 'checkbox') {
            const { checked } = e.target as HTMLInputElement;
            setFormData(prev => ({ ...prev, [name]: checked }));
            return;
        }
        setFormData(prev => ({
            ...prev,
            [name]: name === 'price' || name === 'sort_order' ? parseInt(value) || 0 : value,
        }));
    };

    const handleAddDescription = () => {
        if (newDescription.trim()) {
            setDescriptions([...descriptions, newDescription.trim()]);
            setNewDescription('');
        }
    };

    const handleRemoveDescription = (index: number) => {
        setDescriptions(descriptions.filter((_, i) => i !== index));
    };

    const handleSubmit = async (e: React.FormEvent) => {
        e.preventDefault();
        const submitData = {
            ...formData,
            ...(descriptions.length > 0 && { descriptions }),
        };
        await onSubmit(submitData);
    };

    const inputClass = 'block w-full px-4 py-2.5 text-sm text-gray-900 dark:text-gray-100 border border-gray-200 dark:border-gray-700 rounded-xl bg-gray-50 dark:bg-gray-800/60 placeholder-gray-400 dark:placeholder-gray-500 focus:ring-2 focus:ring-indigo-500/20 focus:border-indigo-500 dark:focus:border-indigo-400 transition-colors';
    const labelClass = 'block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1.5';

    return (
        <form onSubmit={handleSubmit} className="space-y-6 bg-white dark:bg-gray-900 p-6 rounded-2xl ring-1 ring-gray-200 dark:ring-gray-800 shadow-sm">
            <div className="pb-4 border-b border-gray-100 dark:border-gray-800">
                <h3 className="text-lg font-semibold text-gray-900 dark:text-gray-100">
                    {product ? 'ویرایش محصول' : 'ایجاد محصول جدید'} برای پکیج {packageName}
                </h3>
            </div>

            <div className="grid grid-cols-1 gap-5 md:grid-cols-2">
                <div>
                    <label htmlFor="title" className={labelClass}>عنوان <span className="text-red-500">*</span></label>
                    <input type="text" id="title" name="title" required value={formData.title || ''} onChange={handleInputChange} className={inputClass} placeholder="مثال: اشتراک ماهانه" />
                </div>
                <div>
                    <label htmlFor="price" className={labelClass}>قیمت (تومان) <span className="text-red-500">*</span></label>
                    <input type="number" id="price" name="price" required min="0" value={formData.price || ''} onChange={handleInputChange} className={inputClass} placeholder="مثال: 60000" />
                </div>
                <div>
                    <label htmlFor="type" className={labelClass}>نوع اشتراک <span className="text-red-500">*</span></label>
                    <select id="type" name="type" required value={formData.type || 4} onChange={handleInputChange} className={inputClass}>
                        {Object.entries(PRODUCT_TYPES).map(([value, label]) => (
                            <option key={value} value={value}>{label}</option>
                        ))}
                    </select>
                </div>
                <div>
                    <label htmlFor="discounted_price" className={labelClass}>قیمت کلی تخفیف خورده <span className="text-xs text-gray-400">(فقط نمایشی)</span></label>
                    <input type="text" id="discounted_price" name="discounted_price" value={formData.discounted_price || ''} onChange={handleInputChange} dir="rtl" className={inputClass} placeholder="مثال: ۱٬۴۶۰٬۰۰۰" />
                </div>
                <div>
                    <label htmlFor="daily_price" className={labelClass}>قیمت روزانه <span className="text-xs text-gray-400">(فقط نمایشی)</span></label>
                    <input type="text" id="daily_price" name="daily_price" value={formData.daily_price || ''} onChange={handleInputChange} dir="rtl" className={inputClass} placeholder="مثال: معادل روزانه ۴٬۰۰۰ تومان" />
                </div>
                <div>
                    <label htmlFor="discount" className={labelClass}>تخفیف <span className="text-xs text-gray-400">(فقط نمایشی)</span></label>
                    <input type="text" id="discount" name="discount" value={formData.discount || ''} onChange={handleInputChange} dir="rtl" className={inputClass} placeholder="مثال: ۵۵٪ تخفیف" />
                </div>
                <div>
                    <label htmlFor="sort_order" className={labelClass}>ترتیب نمایش <span className="text-xs text-gray-400">(۰ بالاترین)</span></label>
                    <input type="number" id="sort_order" name="sort_order" min="0" value={formData.sort_order ?? 0} onChange={handleInputChange} className={inputClass} placeholder="0" />
                </div>
                <div className="md:col-span-2">
                    <label className="flex items-center gap-3 cursor-pointer p-3 rounded-xl bg-gray-50 dark:bg-gray-800/60 hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors">
                        <input type="checkbox" name="is_best_seller" checked={!!formData.is_best_seller} onChange={handleInputChange} className="h-4 w-4 text-indigo-600 border-gray-300 dark:border-gray-600 rounded-lg focus:ring-indigo-500 dark:bg-gray-800" />
                        <div>
                            <span className="text-sm font-medium text-gray-700 dark:text-gray-300">پرفروش‌ترین اشتراک</span>
                            <span className="text-xs text-gray-400 mr-2">(فقط برای یک محصول فعال می‌شود)</span>
                        </div>
                    </label>
                </div>
            </div>

            <div className="pt-4 border-t border-gray-100 dark:border-gray-800">
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">ویژگی‌ها</label>
                <div className="flex gap-2">
                    <input
                        type="text"
                        value={newDescription}
                        onChange={(e) => setNewDescription(e.target.value)}
                        className={`flex-1 ${inputClass}`}
                        placeholder="ویژگی جدید را وارد کنید"
                        onKeyDown={(e) => { if (e.key === 'Enter') { e.preventDefault(); handleAddDescription(); } }}
                    />
                    <button type="button" onClick={handleAddDescription} className="inline-flex items-center px-4 py-2.5 rounded-xl bg-indigo-600 text-white text-sm font-medium hover:bg-indigo-700 focus:ring-2 focus:ring-indigo-500/30 transition-colors shadow-sm shadow-indigo-500/20">
                        <PlusIcon className="h-5 w-5" />
                    </button>
                </div>
                {descriptions.length > 0 && (
                    <ul className="mt-3 space-y-2">
                        {descriptions.map((desc, index) => (
                            <li key={index} className="flex items-center justify-between px-4 py-2.5 rounded-xl bg-gray-50 dark:bg-gray-800/60 ring-1 ring-gray-100 dark:ring-gray-800">
                                <span className="text-sm text-gray-700 dark:text-gray-300">{desc}</span>
                                <button type="button" onClick={() => handleRemoveDescription(index)} className="text-red-500 hover:text-red-700 dark:text-red-400 transition-colors">
                                    <XMarkIcon className="h-4 w-4" />
                                </button>
                            </li>
                        ))}
                    </ul>
                )}
            </div>

            <div className="flex justify-end gap-3 pt-4 border-t border-gray-100 dark:border-gray-800">
                <button type="button" onClick={onCancel} className="px-5 py-2.5 rounded-xl border border-gray-200 dark:border-gray-700 text-sm font-medium text-gray-700 dark:text-gray-200 bg-white dark:bg-gray-800 hover:bg-gray-50 dark:hover:bg-gray-700 transition-colors">
                    انصراف
                </button>
                <button type="submit" disabled={isLoading} className="px-5 py-2.5 rounded-xl bg-indigo-600 text-white text-sm font-medium hover:bg-indigo-700 focus:ring-2 focus:ring-indigo-500/30 disabled:opacity-50 transition-colors shadow-sm shadow-indigo-500/20">
                    {isLoading ? 'در حال ذخیره...' : product ? 'به‌روزرسانی' : 'ایجاد'}
                </button>
            </div>
        </form>
    );
}