'use client';

import { createContext, useContext, useState, useEffect, useMemo, ReactNode } from 'react';

/** 设备类型枚举 */
export enum DeviceType {
    MOBILE = 'mobile',
    TABLET = 'tablet',
    DESKTOP = 'desktop'
}

/** 屏幕断点配置 */
const BREAKPOINTS = {
    MOBILE: 480,
    TABLET: 1024,
    DESKTOP: 1025
};

/** 设备类型上下文数据接口 */
interface DeviceTypeContextValue {
    deviceType: DeviceType;
    windowSize: {
        width: number;
        height: number;
    };
    isMobile: boolean;
    isTablet: boolean;
    isDesktop: boolean;
    /** 是否为移动端设备（包括平板） */
    isMobileDevice: boolean;
}

const DeviceTypeContext = createContext<DeviceTypeContextValue | null>(null);

/**
 * Device type provider component
 * Centralized device type detection and window size management
 * @param {ReactNode} children - Child components
 */
export function DeviceTypeProvider({ children }: { children: ReactNode }) {
    
    const [deviceType, setDeviceType] = useState<DeviceType>(() => {
        if (typeof window === 'undefined') return DeviceType.DESKTOP;
        const width = window.innerWidth;
        if (width <= BREAKPOINTS.MOBILE) return DeviceType.MOBILE;
        if (width <= BREAKPOINTS.TABLET) return DeviceType.TABLET;
        return DeviceType.DESKTOP;
    });
    
    const [windowSize, setWindowSize] = useState({
        width: typeof window !== 'undefined' ? window.innerWidth : 0,
        height: typeof window !== 'undefined' ? window.innerHeight : 0
    });

    useEffect(() => {
        
        const getDeviceType = (width: number): DeviceType => {
            if (width <= BREAKPOINTS.MOBILE) return DeviceType.MOBILE;
            if (width <= BREAKPOINTS.TABLET) return DeviceType.TABLET;
            return DeviceType.DESKTOP;
        };

        let timeoutId: NodeJS.Timeout | null = null;
        let isInitialized = false;

        const handleResize = () => {
            const width = window.innerWidth;
            const height = window.innerHeight;
            const newDeviceType = getDeviceType(width);


            // Only update if values actually changed
            setWindowSize(prev => {
                const changed = prev.width !== width || prev.height !== height;
                if (changed) {
                    return { width, height };
                }
                return prev;
            });

            setDeviceType(prev => {
                const changed = prev !== newDeviceType;
                if (changed) {
                    return newDeviceType;
                }
                return prev;
            });

            // 移动端动态视口高度处理
            if (width <= BREAKPOINTS.TABLET) {
                const vh = height * 0.01;
                document.documentElement.style.setProperty('--vh', `${vh}px`);
            }
            
            if (!isInitialized) {
                isInitialized = true;
            }
        };

        const debouncedHandleResize = () => {
            if (timeoutId) {
                clearTimeout(timeoutId);
            }
            timeoutId = setTimeout(handleResize, 100);
        };

        // 初始化 - 因为 state 已经在初始化时设置了正确的值，这里只需要设置 vh 变量
        const width = window.innerWidth;
        const height = window.innerHeight;
        if (width <= BREAKPOINTS.TABLET) {
            const vh = height * 0.01;
            document.documentElement.style.setProperty('--vh', `${vh}px`);
        }
        isInitialized = true;

        // 添加事件监听
        window.addEventListener('resize', debouncedHandleResize);
        window.addEventListener('orientationchange', () => {
            // 延迟处理以确保获取正确的视口尺寸
            setTimeout(handleResize, 100);
        });

        return () => {
            if (timeoutId) {
                clearTimeout(timeoutId);
            }
            window.removeEventListener('resize', debouncedHandleResize);
            window.removeEventListener('orientationchange', handleResize);
        };
    }, []);

    const value = useMemo<DeviceTypeContextValue>(() => ({
        deviceType,
        windowSize,
        isMobile: deviceType === DeviceType.MOBILE,
        isTablet: deviceType === DeviceType.TABLET,
        isDesktop: deviceType === DeviceType.DESKTOP,
        isMobileDevice: deviceType === DeviceType.MOBILE || deviceType === DeviceType.TABLET
    }), [deviceType, windowSize]);

    return (
        <DeviceTypeContext.Provider value={value}>
            {children}
        </DeviceTypeContext.Provider>
    );
}

/**
 * Hook to access device type context
 * @returns {DeviceTypeContextValue} Device type information
 * @throws {Error} If used outside DeviceTypeProvider
 */
export function useDeviceType(): DeviceTypeContextValue {
    const context = useContext(DeviceTypeContext);
    if (!context) {
        throw new Error('useDeviceType must be used within DeviceTypeProvider');
    }
    return context;
}