import { useEffect, useState } from 'preact/hooks';

import { getSafeAreaInfo, getSafeAreaStyle, isSafeAreaReady, subscribeSafeAreaChange, tryGetSafeAreaInfo } from './safe-area';

/**
 * React Hook：获取 Safe Area 信息
 * 自动处理异步数据获取和状态更新
 *
 * @example
 * function MyComponent() {
 *   const safeArea = useSafeArea();
 *   return (
 *     <div>
 *       Left: {safeArea.left}px
 *       Right: {safeArea.right}px
 *     </div>
 *   );
 * }
 */
export function useSafeArea() {
  const [safeArea, setSafeArea] = useState(() => getSafeAreaInfo());

  useEffect(() => {
    let mounted = true;

    // 如果数据还未准备好，等待数据准备完成
    if (!isSafeAreaReady()) {
      tryGetSafeAreaInfo().then(() => {
        if (mounted) {
          setSafeArea(getSafeAreaInfo());
        }
      });
    }

    // 订阅数据变化，当数据更新时自动刷新
    const unsubscribe = subscribeSafeAreaChange(() => {
      if (mounted) {
        setSafeArea(getSafeAreaInfo());
      }
    });

    return () => {
      mounted = false;
      unsubscribe();
    };
  }, []);

  return safeArea;
}

/**
 * React Hook：获取 Safe Area 样式对象
 * 自动处理异步数据获取和状态更新
 *
 * @param options - 可选配置
 * @param options.left - 是否包含 paddingLeft，默认 true
 * @param options.right - 是否包含 paddingRight，默认 true
 * @param options.position - 定位方式，'left' 或 'right'
 *
 * @example
 * // 基本用法（左右都设置）
 * function MyComponent() {
 *   const safeAreaStyle = useSafeAreaStyle();
 *   return <div style={safeAreaStyle}>内容</div>;
 * }
 *
 * @example
 * // 只设置左边距
 * function MyComponent() {
 *   const safeAreaStyle = useSafeAreaStyle({ right: false });
 *   return <div style={safeAreaStyle}>内容</div>;
 * }
 *
 * @example
 * // 设置右侧定位
 * function MyComponent() {
 *   const safeAreaStyle = useSafeAreaStyle({ position: 'right' });
 *   return <div style={safeAreaStyle}>内容</div>;
 * }
 *
 * @example
 * // 与其他样式合并
 * function MyComponent() {
 *   const safeAreaStyle = useSafeAreaStyle();
 *   return (
 *     <div style={{ ...safeAreaStyle, backgroundColor: 'red' }}>
 *       内容
 *     </div>
 *   );
 * }
 */
export function useSafeAreaStyle(options?: { left?: boolean; right?: boolean; position?: 'left' | 'right' }) {
  const [safeAreaStyle, setSafeAreaStyle] = useState(() => getSafeAreaStyle(options));

  useEffect(() => {
    let mounted = true;

    // 如果数据还未准备好，等待数据准备完成
    if (!isSafeAreaReady()) {
      tryGetSafeAreaInfo().then(() => {
        if (mounted) {
          setSafeAreaStyle(getSafeAreaStyle(options));
        }
      });
    }

    // 订阅数据变化，当数据更新时自动刷新样式
    const unsubscribe = subscribeSafeAreaChange(() => {
      if (mounted) {
        setSafeAreaStyle(getSafeAreaStyle(options));
      }
    });

    return () => {
      mounted = false;
      unsubscribe();
    };
  }, [options?.left, options?.right, options?.position]);

  return safeAreaStyle;
}