import { useEffect, useMemo, useState } from 'react';
import { Input, List, Spin, Empty, Typography, Tag } from 'antd';
import { FolderOpenOutlined, SearchOutlined } from '@ant-design/icons';
import { useAppDispatch, useAppSelector } from '../../store/store';
import { getCompanyGroupsThunk } from '../../store/slices/companyGroupsSlice/thunks';
import { setActiveCompanyGroup } from '../../store/slices/companyGroupsSlice/companyGroupsSlice';
import { useVirtualList } from '../../hooks/useVirtualList';

const { Text } = Typography;

export const CompanyGroupsList = () => {
	const dispatch = useAppDispatch();

	const rawRows = useAppSelector((state) => state.company_groups.raw_rows);
	const loading = useAppSelector((state) => state.company_groups.loading);
	const activeCompanyGroup = useAppSelector((state) => state.company_groups.activeCompanyGroup);

	const [query, setQuery] = useState('');

	const filtered = useMemo(() => {
		const q = query.trim().toLowerCase();
		if (!q) return rawRows;
		return rawRows.filter((g) => g.name.toLowerCase().includes(q) || g.crm_id?.toLowerCase().includes(q));
	}, [rawRows, query]);

	const { ref, onScroll, visibleItems, totalHeight, offsetY } = useVirtualList(filtered, {
		itemHeight: 56,
		containerHeight: 900,
		overscan: 5,
	});

	useEffect(() => {
		dispatch(getCompanyGroupsThunk());
	}, [dispatch]);

	useEffect(() => {
		if (!activeCompanyGroup && rawRows?.length) {
			dispatch(setActiveCompanyGroup(rawRows?.[0]));
		}
	}, [rawRows, activeCompanyGroup, dispatch]);

	return (
		<div
			style={{
				display: 'flex',
				flexDirection: 'column',
				height: '100%',
				background: '#fff',
				borderRight: '1px solid #f0f0f0',
				borderRadius: 12,
			}}>
			<div style={{ padding: 12 }}>
				<Input
					allowClear
					prefix={<SearchOutlined style={{ color: '#bfbfbf' }} />}
					placeholder='Поиск по ГК или CRM ID'
					value={query}
					onChange={(e) => setQuery(e.target.value)}
				/>
			</div>

			<div ref={ref} onScroll={onScroll} style={{ flex: 1, overflowY: 'auto', padding: '0 8px 8px' }}>
				{loading ? (
					<div style={{ textAlign: 'center', padding: 24 }}>
						<Spin />
					</div>
				) : filtered.length === 0 ? (
					<Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description='Компании и организации не найдены' style={{ marginTop: 32 }} />
				) : (
					<div style={{ height: totalHeight, position: 'relative' }}>
						<div style={{ transform: `translateY(${offsetY}px)` }}>
							<List
								dataSource={visibleItems}
								split={false}
								renderItem={({item}) => {
									const active = item.id === activeCompanyGroup?.id;
									return (
										<List.Item
											onClick={() => dispatch(setActiveCompanyGroup(item))}
											style={{
												cursor: 'pointer',
												borderRadius: 8,
												padding: '10px 12px',
												marginBottom: 4,
												background: active ? '#e6f4ea' : 'transparent',
												boxShadow: active ? 'inset 0 0 0 1px #2ea64b3d, inset 3px 0 0 #258141' : 'inset 0 0 0 1px #0f172a14',
												transition: 'background 0.15s',
											}}
											onMouseEnter={(e) => {
												if (!active) {
													(e.currentTarget as HTMLElement).style.background = '#fafafa';
												}
											}}
											onMouseLeave={(e) => {
												if (!active) {
													(e.currentTarget as HTMLElement).style.background = 'transparent';
												}
											}}>
											<div
												style={{
													display: 'flex',
													alignItems: 'center',
													width: '100%',
													gap: 12,
													minWidth: 0,
												}}>
												<FolderOpenOutlined style={{ fontSize: 18, color: '#8c8c8c', flexShrink: 0 }} />

												<div style={{ flex: 1, minWidth: 0 }}>
													<Text
														strong
														ellipsis
														style={{
															display: 'block',
															fontSize: 14,
															lineHeight: '20px',
														}}>
														{item.name}
													</Text>
													<Text
														type='secondary'
														ellipsis
														style={{
															display: 'block',
															fontSize: 12,
															lineHeight: '16px',
														}}>
														CRM ID: {item.crm_id ?? '-'}
													</Text>
												</div>

												<Tag
													style={{
														margin: 0,
														borderRadius: 10,
														background: '#f5f5f5',
														border: 'none',
														color: '#595959',
														fontWeight: 500,
														minWidth: 24,
														height: 20,
														lineHeight: '20px',
														textAlign: 'center',
														padding: '0 8px',
														flexShrink: 0,
													}}>
													{item.legal_entities_count}
												</Tag>
											</div>
										</List.Item>
									);
								}}
							/>
						</div>
					</div>
				)}
			</div>
		</div>
	);
};