/**
 * TabContainer 通用 Tab 容器组件
 *
 * 功能：
 * - 管理 Tab 切换状态（支持受控/非受控模式）
 * - 动态渲染 Tab 导航和内容
 * - 支持多种主题预设（黑金、默认、深色、浅色）
 * - 支持自定义主题颜色
 * - 支持懒加载
 *
 * @example
 * // 基础用法（传入 components）
 * <TabContainer
 *   tabs={[
 *     { key: 'tab1', name: 'Tab 1', icon: FaHome, component: Tab1Content },
 *     { key: 'tab2', name: 'Tab 2', icon: FaUser, component: Tab2Content },
 *   ]}
 *   componentProps={{ userId: '123' }}
 *   onTabChange={(index, key) => console.log('切换到', key)}
 * />
 *
 * @example
 * // 自定义渲染用法（使用 children）
 * <TabContainer tabs={tabs} themePreset="dark">
 *   <TabPanel>自定义内容 1</TabPanel>
 *   <TabPanel>自定义内容 2</TabPanel>
 * </TabContainer>
 */

import React, { useState, useCallback, useMemo } from 'react';
import {
  Card,
  CardBody,
  Tabs,
  TabPanels,
  TabPanel,
} from '@chakra-ui/react';

import TabNavigation from './TabNavigation';
import { THEME_PRESETS, DEFAULT_CONFIG } from './constants';
import type { TabContainerProps, ThemeColors } from './types';

// 导出类型和常量
export type { TabConfig, ThemeColors, ThemePreset, TabContainerProps } from './types';
export { THEME_PRESETS } from './constants';

const TabContainer: React.FC<TabContainerProps> = ({
  tabs,
  componentProps = {},
  onTabChange,
  defaultIndex = 0,
  index: controlledIndex,
  themePreset = DEFAULT_CONFIG.themePreset,
  themeColors: customThemeColors,
  isLazy = DEFAULT_CONFIG.isLazy,
  size = DEFAULT_CONFIG.size,
  borderRadius = DEFAULT_CONFIG.borderRadius,
  shadow = DEFAULT_CONFIG.shadow,
  panelPadding = DEFAULT_CONFIG.panelPadding,
  children,
}) => {
  // 内部状态（非受控模式）
  const [internalIndex, setInternalIndex] = useState(defaultIndex);

  // 当前索引（支持受控/非受控）
  const currentIndex = controlledIndex ?? internalIndex;

  // 合并主题颜色（自定义颜色优先）
  const themeColors: Required<ThemeColors> = useMemo(() => ({
    ...THEME_PRESETS[themePreset],
    ...customThemeColors,
  }), [themePreset, customThemeColors]);

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

    // 触发回调
    onTabChange?.(newIndex, tabKey, currentIndex);

    // 非受控模式下更新内部状态
    if (controlledIndex === undefined) {
      setInternalIndex(newIndex);
    }
  }, [tabs, onTabChange, currentIndex, controlledIndex]);

  /**
   * 渲染 Tab 内容
   */
  const renderTabPanels = () => {
    // 如果传入了 children，直接渲染 children
    if (children) {
      return children;
    }

    // 否则根据 tabs 配置渲染
    return tabs.map((tab) => {
      const Component = tab.component;
      return (
        <TabPanel key={tab.key} px={panelPadding} py={panelPadding}>
          {Component ? <Component {...componentProps} /> : null}
        </TabPanel>
      );
    });
  };

  return (
    <Card shadow={shadow} bg={themeColors.bg} borderRadius={borderRadius}>
      <CardBody p={0}>
        <Tabs
          isLazy={isLazy}
          variant="unstyled"
          size={size}
          index={currentIndex}
          onChange={handleTabChange}
        >
          {/* Tab 导航 */}
          <TabNavigation
            tabs={tabs}
            themeColors={themeColors}
            borderRadius={borderRadius}
          />

          {/* Tab 内容面板 */}
          <TabPanels>{renderTabPanels()}</TabPanels>
        </Tabs>
      </CardBody>
    </Card>
  );
};

export default TabContainer;