import { ref, computed, onMounted, onUnmounted } from 'vue'

/**
 * 问候语组合式函数
 * @param name - 用户名（可选）
 * @param realtime - 是否实时更新（默认false）
 */
export function useGreeting(name?: string, realtime: boolean = false) {
    const currentHour = ref(new Date().getHours())
    
    // 问候语
    const greeting = computed(() => {
        const hour = currentHour.value
        
        let message = ''
        if (hour >= 5 && hour < 12) {
            message = 'Good Morning'
        } else if (hour >= 12 && hour < 18) {
            message = 'Good Afternoon'
        } else if (hour >= 18 && hour < 22) {
            message = 'Good Evening'
        } else {
            message = 'Good Night'
        }
        
        return name ? `${message}, ${name}!` : message
    })
    
    // 带Emoji的问候语
    const greetingWithEmoji = computed(() => {
        const hour = currentHour.value
        
        let message = ''
        let emoji = ''
        
        if (hour >= 5 && hour < 12) {
            message = 'Good Morning'
            emoji = '🌅'
        } else if (hour >= 12 && hour < 18) {
            message = 'Good Afternoon'
            emoji = '☀️'
        } else if (hour >= 18 && hour < 22) {
            message = 'Good Evening'
            emoji = '🌆'
        } else {
            message = 'Good Night'
            emoji = '🌙'
        }
        
        message = `${emoji} ${message}`
        return name ? `${message}, ${name}!` : message
    })
    
    // 更新时间
    const updateHour = () => {
        currentHour.value = new Date().getHours()
    }
    
    // 定时器
    let timer: ReturnType<typeof setInterval> | null = null
    
    onMounted(() => {
        if (realtime) {
            timer = setInterval(updateHour, 60000)
        }
    })
    
    onUnmounted(() => {
        if (timer) clearInterval(timer)
    })
    
    return {
        greeting,
        greetingWithEmoji,
        refresh: updateHour
    }
}