import React, { useState, type FormEvent, type ChangeEvent } from 'react';
import { Search, Loader2, AlertCircle, RefreshCw } from 'lucide-react';
import { Button } from '@/ui/button';
import { Input } from '@/ui/input';
import { cn } from '@/lib/utils';
import { useWeatherStore } from '@/store/weatherStore';


export function WeatherSearchForm() {
    const {isLoading, currentWeather, searchWeather, refreshWeather} = useWeatherStore();
    const [city, setCity] = useState('');
    const [inputError, setInputError] = useState('');
    const handleInputChange = (e: ChangeEvent<HTMLInputElement>) => {
        setCity(e.target.value);
        if (inputError) {
            setInputError('');
        };
    }

    const handleFormSubmit = async (e: FormEvent<HTMLFormElement>) => {
        e.preventDefault();
        const trimmedCity = city.trim();
        if (!trimmedCity) {
            setInputError('请输入城市名称');
            return;
        }
         if (trimmedCity.length <2) {
             setInputError('请输入至少2个字符');
             return;
         }
         if (!/^[\u4e00-\u9fa5a-zA-Z\s-]+$/.test(trimmedCity)) {
             setInputError('请输入有效的城市名称');
             return;
         }
         await searchWeather(trimmedCity);
    
        }
        
        return (
            <div className='p-6 border-6 border-b-slate-200/50 '>
                <form onSubmit={handleFormSubmit} className="space-by-3">
                    <div className="relative">
                        <div className="absolute inset-y-0 left-4 flex items-center pl-3 pointer-events-none">
                            <Search className="w-5 h-5 text-gray-500 dark:text-gray-400" />
                        </div>
                        <Input
                            type="text"
                            value={city}
                            onChange={handleInputChange}
                            placeholder="请输入城市名称"
                            disabled={isLoading}
                            className={cn('pl-10 pr-4 py-2 w-full text-base rounded-xl bg-slate-50/50 focus:bg-white transition-all', inputError && 'border-red-500') }
                        />
                    </div>
                    {inputError && (
                        <div className=" flex items-center gap-2 px-3 py-2 rounded-lg bg-red-50/80 animated-in slide-in-from-top-1 fade-in">
                            <AlertCircle className="inline w-4 h-4 text-red-500 mt-0.5" />
                            <p className="text-red-500 text-xs">{inputError}</p>
                        </div>


                    )
                    }

                    <div className='flex gap-2'>
                        <Button type="submit" disabled={isLoading || !city.trim()} className="mt-4 w-full">
                            {isLoading ? <>
                                <Loader2 className="animate-spin w-5 h-5 text-white" />
                                <span>搜索中...</span>
                            </> : (<>
                                <Search className="w-5 h-5 text-white" />
                                <span>搜索天气</span>
                            </>)}
                        </Button>
                        {currentWeather && (
                            <Button type="button" variant="outline" onClick={refreshWeather} disabled={isLoading} className="mt-4 w-full" title='刷新数据'>
                                <RefreshCw className={cn("w-5 h-5", isLoading && "animate-spin")} />

                            </Button>
                        )}
                    </div>


                </form>
            </div>



        )
    }


