import React, { useState } from 'react';
import { createPortal } from 'react-dom';
import { useLanguage } from '../contexts/LanguageContext';
import { KnowledgeGroup } from '../types';
import { Check, X, Search, Database } from 'lucide-react';

interface GroupSelectionDrawerProps {
    isOpen: boolean;
    onClose: () => void;
    groups: KnowledgeGroup[];
    selectedGroups: string[];
    onSelectionChange: (groupIds: string[]) => void;
}

export const GroupSelectionDrawer: React.FC<GroupSelectionDrawerProps> = ({
    isOpen,
    onClose,
    groups,
    selectedGroups,
    onSelectionChange
}) => {
    const { t } = useLanguage();
    const [searchTerm, setSearchTerm] = useState('');

    if (!isOpen) return null;

    const filteredGroups = groups.filter(g =>
        g.name.toLowerCase().includes(searchTerm.toLowerCase())
    );

    const isAllSelected = selectedGroups.length === 0;

    const handleToggleGroup = (groupId: string) => {
        if (selectedGroups.includes(groupId)) {
            onSelectionChange(selectedGroups.filter(id => id !== groupId));
        } else {
            onSelectionChange([...selectedGroups, groupId]);
        }
    };

    const handleSelectAll = () => {
        onSelectionChange([]);
    };

    return createPortal(
        <div className="fixed inset-0 z-50 overflow-hidden">
            <div className="absolute inset-0 bg-black/30 backdrop-blur-sm transition-opacity" onClick={onClose} />
            <div className="absolute inset-y-0 right-0 max-w-md w-full flex">
                <div className="flex-1 flex flex-col bg-white shadow-xl animate-in slide-in-from-right duration-300">
                    <div className="flex items-center justify-between px-4 py-3 border-b border-gray-200">
                        <h2 className="text-lg font-medium text-gray-900 flex items-center gap-2">
                            <Database size={20} />
                            {t('selectKnowledgeGroups')}
                        </h2>
                        <button
                            onClick={onClose}
                            className="text-gray-400 hover:text-gray-500 focus:outline-none"
                        >
                            <X size={24} />
                        </button>
                    </div>

                    {/* Search Box */}
                    <div className="p-4 border-b border-gray-100">
                        <div className="relative">
                            <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400" />
                            <input
                                type="text"
                                placeholder={t('searchGroupsPlaceholder')}
                                value={searchTerm}
                                onChange={(e) => setSearchTerm(e.target.value)}
                                className="w-full pl-9 pr-4 py-2 text-sm border border-gray-200 rounded-lg focus:outline-none focus:border-blue-500 focus:ring-1 focus:ring-blue-500 bg-gray-50"
                            />
                        </div>
                    </div>

                    <div className="flex-1 overflow-y-auto p-4 space-y-1">
                        {!searchTerm && (
                            <div
                                onClick={handleSelectAll}
                                className={`flex items-center px-4 py-3.5 cursor-pointer hover:bg-slate-50 rounded-xl transition-all ${isAllSelected ? 'bg-blue-50/50 text-blue-700 outline outline-1 outline-blue-200' : 'text-slate-700 border border-transparent'
                                    }`}
                            >
                                <div className={`w-5 h-5 mr-3 border rounded-md flex items-center justify-center transition-colors ${isAllSelected ? 'bg-blue-600 border-blue-600' : 'border-slate-300'
                                    }`}>
                                    {isAllSelected && <Check size={14} className="text-white" />}
                                </div>
                                <span className="font-semibold text-sm">{t('all')}</span>
                            </div>
                        )}

                        {filteredGroups.map((group) => {
                            const isSelected = selectedGroups.includes(group.id);
                            return (
                                <div
                                    key={group.id}
                                    onClick={() => handleToggleGroup(group.id)}
                                    className={`flex items-center px-4 py-3 cursor-pointer hover:bg-slate-50 rounded-xl transition-all ${isSelected ? 'bg-blue-50/50 outline outline-1 outline-blue-200' : 'border border-transparent'
                                        }`}
                                >
                                    <div className={`w-5 h-5 mr-3 border rounded-md flex items-center justify-center flex-shrink-0 transition-colors ${isSelected ? 'bg-blue-600 border-blue-600' : 'border-slate-300'
                                        }`}>
                                        {isSelected && <Check size={14} className="text-white" />}
                                    </div>
                                    <div
                                        className="w-3 h-3 rounded-full mr-3 flex-shrink-0 shadow-sm"
                                        style={{ backgroundColor: group.color }}
                                    />
                                    <div className="flex-1 min-w-0">
                                        <div className={`text-sm truncate transition-colors ${isSelected ? 'text-blue-700 font-semibold' : 'text-slate-700 font-medium'}`}>
                                            {group.name}
                                        </div>
                                        <div className={`text-xs mt-0.5 transition-colors ${isSelected ? 'text-blue-500/80' : 'text-slate-400'}`}>
                                            {group.fileCount} 个文件
                                        </div>
                                    </div>
                                </div>
                            );
                        })}

                        {filteredGroups.length === 0 && (
                            <div className="py-12 text-center text-slate-400 text-sm flex flex-col items-center justify-center gap-2">
                                <Database size={32} className="text-slate-200" />
                                <span>{searchTerm ? t('noGroupsFound') : t('noGroups')}</span>
                            </div>
                        )}
                    </div>

                    <div className="p-4 border-t border-gray-200 bg-gray-50">
                        <button
                            onClick={onClose}
                            className="w-full py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors font-medium"
                        >
                            {t('done')} ({isAllSelected ? t('all') : selectedGroups.length})
                        </button>
                    </div>
                </div>
            </div>
        </div>,
        document.body
    );
};