/**
 * SubTabContainer - 二级导航容器组件
 *
 * 用于模块内的子功能切换（如公司档案下的股权结构、管理团队等）
 * 与 TabContainer（一级导航）区分：无 Card 包裹，直接融入父容器
 *
 * @example
 * ```tsx
 * <SubTabContainer
 *   tabs={[
 *     { key: 'tab1', name: 'Tab 1', icon: FaHome, component: Tab1 },
 *     { key: 'tab2', name: 'Tab 2', icon: FaUser, component: Tab2 },
 *   ]}
 *   componentProps={{ stockCode: '000001' }}
 *   onTabChange={(index, key) => console.log('切换到', key)}
 * />
 * ```
 */

import React, { useState, useCallback, memo } from 'react';
import {
  Box,
  Tabs,
  TabList,
  TabPanels,
  Tab,
  TabPanel,
  Icon,
  HStack,
  Text,
  Spacer,
} from '@chakra-ui/react';
import type { ComponentType } from 'react';
import type { IconType } from 'react-icons';

/**
 * Tab 配置项
 */
export interface SubTabConfig {
  key: string;
  name: string;
  icon?: IconType | ComponentType;
  component?: ComponentType<any>;
}

/**
 * 主题配置
 */
export interface SubTabTheme {
  bg: string;
  borderColor: string;
  tabSelectedBg: string;
  tabSelectedColor: string;
  tabUnselectedColor: string;
  tabHoverBg: string;
}

/**
 * 预设主题
 */
const THEME_PRESETS: Record<string, SubTabTheme> = {
  blackGold: {
    bg: 'gray.900',
    borderColor: 'rgba(212, 175, 55, 0.3)',
    tabSelectedBg: '#D4AF37',
    tabSelectedColor: 'gray.900',
    tabUnselectedColor: '#D4AF37',
    tabHoverBg: 'gray.600',
  },
  default: {
    bg: 'white',
    borderColor: 'gray.200',
    tabSelectedBg: 'blue.500',
    tabSelectedColor: 'white',
    tabUnselectedColor: 'gray.600',
    tabHoverBg: 'gray.100',
  },
};

export interface SubTabContainerProps {
  /** Tab 配置数组 */
  tabs: SubTabConfig[];
  /** 传递给 Tab 内容组件的 props */
  componentProps?: Record<string, any>;
  /** 默认选中的 Tab 索引 */
  defaultIndex?: number;
  /** 受控模式下的当前索引 */
  index?: number;
  /** Tab 变更回调 */
  onTabChange?: (index: number, tabKey: string) => void;
  /** 主题预设 */
  themePreset?: 'blackGold' | 'default';
  /** 自定义主题（优先级高于预设） */
  theme?: Partial<SubTabTheme>;
  /** 内容区内边距 */
  contentPadding?: number;
  /** 是否懒加载 */
  isLazy?: boolean;
  /** TabList 右侧自定义内容 */
  rightElement?: React.ReactNode;
}

const SubTabContainer: React.FC<SubTabContainerProps> = memo(({
  tabs,
  componentProps = {},
  defaultIndex = 0,
  index: controlledIndex,
  onTabChange,
  themePreset = 'blackGold',
  theme: customTheme,
  contentPadding = 4,
  isLazy = true,
  rightElement,
}) => {
  // 内部状态（非受控模式）
  const [internalIndex, setInternalIndex] = useState(defaultIndex);

  // 当前索引
  const currentIndex = controlledIndex ?? internalIndex;

  // 记录已访问的 Tab 索引（用于真正的懒加载）
  const [visitedTabs, setVisitedTabs] = useState<Set<number>>(
    () => new Set([controlledIndex ?? defaultIndex])
  );

  // 合并主题
  const theme: SubTabTheme = {
    ...THEME_PRESETS[themePreset],
    ...customTheme,
  };

  /**
   * 处理 Tab 切换
   */
  const handleTabChange = useCallback(
    (newIndex: number) => {
      const tabKey = tabs[newIndex]?.key || '';
      onTabChange?.(newIndex, tabKey);

      // 记录已访问的 Tab（用于懒加载）
      setVisitedTabs(prev => {
        if (prev.has(newIndex)) return prev;
        return new Set(prev).add(newIndex);
      });

      if (controlledIndex === undefined) {
        setInternalIndex(newIndex);
      }
    },
    [tabs, onTabChange, controlledIndex]
  );

  return (
    <Box>
      <Tabs
        isLazy={isLazy}
        variant="unstyled"
        index={currentIndex}
        onChange={handleTabChange}
      >
        <TabList
          bg={theme.bg}
          borderBottom="1px solid"
          borderColor={theme.borderColor}
          pl={0}
          pr={2}
          py={1.5}
          flexWrap="nowrap"
          gap={1}
          alignItems="center"
          overflowX="auto"
          css={{
            '&::-webkit-scrollbar': { display: 'none' },
            scrollbarWidth: 'none',
          }}
        >
          {tabs.map((tab) => (
            <Tab
              key={tab.key}
              color={theme.tabUnselectedColor}
              borderRadius="full"
              px={2.5}
              py={1.5}
              fontSize="xs"
              whiteSpace="nowrap"
              flexShrink={0}
              _selected={{
                bg: theme.tabSelectedBg,
                color: theme.tabSelectedColor,
                fontWeight: 'bold',
              }}
              _hover={{
                bg: theme.tabHoverBg,
              }}
            >
              <HStack spacing={1}>
                {tab.icon && <Icon as={tab.icon} boxSize={3} />}
                <Text>{tab.name}</Text>
              </HStack>
            </Tab>
          ))}
          {rightElement && (
            <>
              <Spacer />
              <Box flexShrink={0}>{rightElement}</Box>
            </>
          )}
        </TabList>

        <TabPanels p={contentPadding}>
          {tabs.map((tab, idx) => {
            const Component = tab.component;
            // 懒加载：只渲染已访问过的 Tab
            const shouldRender = !isLazy || visitedTabs.has(idx);

            return (
              <TabPanel key={tab.key} p={0}>
                {shouldRender && Component ? (
                  <Component {...componentProps} />
                ) : null}
              </TabPanel>
            );
          })}
        </TabPanels>
      </Tabs>
    </Box>
  );
});

SubTabContainer.displayName = 'SubTabContainer';

export default SubTabContainer;