import React, { memo } from 'react';
import type { FileSystemItem as FileSystemItemType } from '../types';
import FileItem from './FileItem';
import Spinner from './Spinner';
import { PathBar } from './PathBar';

interface FileListProps {
    items: FileSystemItemType[];
    isLoading: boolean;
    onDownload: () => void;
    selectedIds: string[];
    onSelectItem: (id: string) => void;
    onFolderDoubleClick?: (folder: FileSystemItemType) => void;
    onNavigateBack?: () => void;
    onNavigateForward?: () => void;
    canNavigateBack?: boolean;
    canNavigateForward?: boolean;
    currentPath?: string;
    currentMode?: 'api' | 'sharing' | null;
    isDownloadButtonLoading?: boolean;
    hasCustomPath?: boolean;
    isCustomPath?: boolean;
    onSaveCustomPath?: () => void;
    isSavingCustomPath?: boolean;
    initialSearchQuery?: string; // Auto-fill search input from parent
}

const FileList: React.FC<FileListProps> = ({
    items,
    isLoading,
    onDownload,
    selectedIds,
    onSelectItem,
    onFolderDoubleClick,
    onNavigateBack,
    onNavigateForward,
    canNavigateBack = false,
    canNavigateForward = false,
    currentPath = '',
    currentMode = null,
    isDownloadButtonLoading = false,
    hasCustomPath = false,
    isCustomPath = false,
    onSaveCustomPath,
    isSavingCustomPath = false,
    initialSearchQuery = ''
}) => {
    // Search state
    const [searchQuery, setSearchQuery] = React.useState(initialSearchQuery);
    const [debouncedQuery, setDebouncedQuery] = React.useState(initialSearchQuery);

    // Update search query when initialSearchQuery changes (from parent)
    React.useEffect(() => {
        setSearchQuery(initialSearchQuery);
        setDebouncedQuery(initialSearchQuery);
    }, [initialSearchQuery]);

    // Debounce search query (300ms)
    React.useEffect(() => {
        const timer = setTimeout(() => {
            setDebouncedQuery(searchQuery);
        }, 300);

        return () => clearTimeout(timer);
    }, [searchQuery]);

    // Filter items based on search query
    const filteredItems = React.useMemo(() => {
        if (!debouncedQuery.trim()) {
            return items;
        }

        const query = debouncedQuery.toLowerCase();
        return items.filter(item =>
            item.name.toLowerCase().includes(query)
        );
    }, [items, debouncedQuery]);

    const hasFilesOrFolders = filteredItems.length > 0;
    const selectedCount = selectedIds.length;

    const buttonText = selectedCount > 0 ? `Tải xuống ${selectedCount} mục` : 'Tải xuống tất cả';
    const isDownloadDisabled = selectedCount === 0 && !hasFilesOrFolders;

    const renderContent = () => {
        if (isLoading) {
            return (
                <div className="text-center py-10 px-6 flex justify-center items-center gap-2">
                    <Spinner />
                    <p className="text-slate-400">Đang tải danh sách tệp...</p>
                </div>
            );
        }

        if (items.length > 0) {
            return (
                <>
                    <div className="grid grid-cols-12 gap-4 px-4 py-3 bg-slate-900/50 text-xs font-semibold text-slate-400 uppercase tracking-wider border-b border-slate-700 flex-shrink-0">
                        <div className="col-span-6">Tên</div>
                        <div className="col-span-3 text-right">Ngày sửa đổi</div>
                        <div className="col-span-2 text-right">Kích thước</div>
                        <div className="col-span-1"></div>
                    </div>
                    <div className="divide-y divide-slate-700/50 flex-1 overflow-y-auto">
                        {filteredItems.length > 0 ? (
                            filteredItems.map((item) => (
                                <FileItem
                                    key={item.id}
                                    item={item}
                                    isSelected={selectedIds.includes(item.id)}
                                    onSelect={onSelectItem}
                                    onDoubleClick={item.type === 'folder' && onFolderDoubleClick ? () => onFolderDoubleClick(item) : undefined}
                                />
                            ))
                        ) : (
                            <div className="text-center py-10 px-6">
                                <p className="text-slate-400">Không tìm thấy kết quả cho "{debouncedQuery}"</p>
                            </div>
                        )}
                    </div>
                </>
            )
        }

        return (
            <div className="text-center py-10 px-6 flex-1 flex items-center justify-center">
                <p className="text-slate-400">Không có tệp hoặc thư mục nào. Vui lòng thực hiện tìm kiếm.</p>
            </div>
        )
    };

    return (
        <div className="bg-slate-800/50 backdrop-blur-sm rounded-2xl shadow-2xl border border-slate-700 h-full flex flex-col">
            {/* Header */}
            <div className="p-4 flex justify-between items-center border-b border-slate-700 flex-shrink-0">
                <h2 className="text-xl font-semibold text-white">File & Folder</h2>
                <div className="flex gap-3">
                    <button
                        onClick={() => {
                            // TODO: Open CustomPathManagerModal
                            if (typeof (window as any).openCustomPathManager === 'function') {
                                (window as any).openCustomPathManager();
                            }
                        }}
                        className="flex justify-center items-center gap-2 text-white bg-slate-700 hover:bg-slate-600 focus:ring-4 focus:outline-none focus:ring-slate-600 font-medium rounded-lg text-sm px-4 py-2 text-center transition-all duration-200"
                        title="Quản lý Custom Paths"
                    >
                        <svg className="w-4 h-4" viewBox="0 0 24 24" fill="currentColor">
                            <path fillRule="evenodd" d="M11.078 2.25c-.917 0-1.699.663-1.85 1.567L9.05 4.889c-.02.12-.115.26-.297.348a7.493 7.493 0 0 0-.986.57c-.166.115-.334.126-.45.083L6.3 5.508a1.875 1.875 0 0 0-2.282.819l-.922 1.597a1.875 1.875 0 0 0 .432 2.385l.84.692c.095.078.17.229.154.43a7.598 7.598 0 0 0 0 1.139c.015.2-.059.352-.153.43l-.841.692a1.875 1.875 0 0 0-.432 2.385l.922 1.597a1.875 1.875 0 0 0 2.282.818l1.019-.382c.115-.043.283-.031.45.082.312.214.641.405.985.57.182.088.277.228.297.35l.178 1.071c.151.904.933 1.567 1.85 1.567h1.844c.916 0 1.699-.663 1.85-1.567l.178-1.072c.02-.12.114-.26.297-.349.344-.165.673-.356.985-.57.167-.114.335-.125.45-.082l1.02.382a1.875 1.875 0 0 0 2.28-.819l.923-1.597a1.875 1.875 0 0 0-.432-2.385l-.84-.692c-.095-.078-.17-.229-.154-.43a7.614 7.614 0 0 0 0-1.139c-.016-.2.059-.352.153-.43l.84-.692c.708-.582.891-1.59.433-2.385l-.922-1.597a1.875 1.875 0 0 0-2.282-.818l-1.02.382c-.114.043-.282.031-.449-.083a7.49 7.49 0 0 0-.985-.57c-.183-.087-.277-.227-.297-.348l-.179-1.072a1.875 1.875 0 0 0-1.85-1.567h-1.843ZM12 15.75a3.75 3.75 0 1 0 0-7.5 3.75 3.75 0 0 0 0 7.5Z" clipRule="evenodd" />
                        </svg>
                        Custom Paths
                    </button>
                    <button
                        onClick={onDownload}
                        disabled={isDownloadDisabled || isLoading || isDownloadButtonLoading}
                        className="flex justify-center items-center gap-2 text-white bg-indigo-600 hover:bg-indigo-700 focus:ring-4 focus:outline-none focus:ring-indigo-800 font-medium rounded-lg text-sm px-4 py-2 text-center transition-all duration-200 disabled:bg-slate-600 disabled:text-slate-400 disabled:cursor-not-allowed"
                    >
                        {isDownloadButtonLoading && <Spinner />}
                        {buttonText}
                    </button>
                </div>
            </div>

            {/* Path Bar */}
            {(onNavigateBack || onNavigateForward) && currentPath && (
                <div className="flex-shrink-0">
                    <PathBar
                        currentPath={currentPath}
                        canGoBack={canNavigateBack}
                        canGoForward={canNavigateForward}
                        onNavigateBack={onNavigateBack || (() => { })}
                        onNavigateForward={onNavigateForward || (() => { })}
                        currentMode={currentMode}
                        hasCustomPath={hasCustomPath}
                        isCustomPath={isCustomPath}
                        onSaveCustomPath={onSaveCustomPath}
                        isSavingCustomPath={isSavingCustomPath}
                        searchQuery={searchQuery}
                        onSearchChange={setSearchQuery}
                    />
                </div>
            )}

            {/* File List Content */}
            <div className="flex-1 overflow-hidden flex flex-col">
                {renderContent()}
            </div>
        </div>
    );
};

export default memo(FileList);