import { ref, computed, watch, nextTick, onMounted } from 'vue'
import { useI18n } from 'vue-i18n'
import Config from '@/config/index'
import { localesList } from '@/locale/index'
import { useWindowWidth } from '@/composables/useWindowWidth'
import useGlobalStore from '@/stores/use-global-store'
import useRouter from '@/hooks/useRouter'
import useRoute from '@/hooks/useRoute'

export interface MenuItem {
    path: string
    label: string
    icon: string
    children?: MenuItem[]
    isOpenMenu?: boolean
    submenuHeight?: number
    isExternal?: boolean
    type?: string
    lang?: string
}

function cloneMenu(menus: MenuItem[]): MenuItem[] {
    return menus.map(item => ({
        ...item,
        children: item.children ? cloneMenu(item.children) : [],
        isOpenMenu: item.isOpenMenu ?? false,
    }))
}

export function useMenuSplit() {
    const { locale } = useI18n()
    const globalStore = useGlobalStore()
    const mode = computed(() => globalStore.mode)
    const windowWidth = useWindowWidth(300)
    const shouldShowLanguageMenu = computed(() => windowWidth.value <= 991)
    const { host } = Config
    const router = useRouter()
    const route = useRoute()
    // 子菜单 DOM 引用
    const submenuRefs = ref<any[]>([])
    function setSubmenuRef(index: number, el: HTMElement | null) {
        if (el) {
            submenuRefs.value[index] = el
        }
    }
    // 设置全局模式
    function setMode(code: string) {
        globalStore.setMode(code);
        const homePath = mode.value === 'customer' ? '/pages/customer/index' : '/pages/ib/index'
        router.reLaunch(homePath)
        if (code === 'ib') {
            uni.$emit('open-ib')
        }
        nextTick(() => {
            submenuRefs.value = [] // 重置，等待重新绑定
            menus.value.forEach((item, index) => {
                if (item.isOpenMenu && item.children && item.children.length) {
                    updateSubmenuHeight(index)
                }
            })
        })
    }
    // 测量元素实际高度（用于过渡动画）
    const measureHeight = (element: HTMLElement): number => {
        const originalDisplay = element.style.display
        const originalPosition = element.style.position
        const originalVisibility = element.style.visibility
        const originalWidth = element.style.width
        element.style.display = 'block'
        element.style.position = 'absolute'
        element.style.visibility = 'hidden'
        element.style.width = '100%'
        const height = element.scrollHeight || element.offsetHeight
        element.style.display = originalDisplay
        element.style.position = originalPosition
        element.style.visibility = originalVisibility
        element.style.width = originalWidth
        return height
    }
    // 更新指定索引的子菜单高度
    const updateSubmenuHeight = (index: number) => {
        const refs = submenuRefs.value
        nextTick(() => {
            if (refs && refs[index]) {
                const el = refs[index].$el || refs[index]
                const height = measureHeight(el)
                if (height > 0) {
                    menus.value[index].submenuHeight = height
                }
            }
        })
    }
    let clickTimer: ReturnType<typeof setTimeout> | null = null
    // 点击菜单项（切换展开/折叠或跳转）
    function handleClick(index: number) {
        if (clickTimer) return
        clickTimer = setTimeout(() => {
            clickTimer = null
        }, 300)
        const item = menus.value[index]
        // 无子菜单：执行跳转或特殊操作
        if (!item.children || item.children.length === 0) {
            // #ifdef H5
            if (item.type === 'chat') {
                if (window.LiveChatWidget) {
                    window.LiveChatWidget.call('maximize')
                }
                return
            }
            // #endif
            router.push(item.path)
            return
        }
        // 有子菜单：切换展开/折叠状态
        item.isOpenMenu = !item.isOpenMenu
        if (item.isOpenMenu) {
            nextTick(() => updateSubmenuHeight(index))
        }
    }
    // 子菜单项点击事件（由 cwg-submenu 组件发出）
    function handleSubmenuClick(subItem: any) {
        // 处理语言切换
        if (subItem.type === 'lang') {
            locale.value = subItem.lang
            return
        }
        // 处理外部链接
        if (subItem.isExternal) {
            // #ifdef H5
            window.open(subItem.path, '_blank')
            // #endif
            // #ifdef APP-PLUS
            plus.runtime.openURL(subItem.path)
            // #endif
            return
        }
        // 内部页面跳转
        router.push(subItem.path)
    }

    // 窗口大小变化时重新计算所有已展开子菜单的高度
    const handleResize = () => {
        menus.value.forEach((item, index) => {
            if (item.isOpenMenu && item.children && item.children.length) {
                updateSubmenuHeight(index)
            }
        })
    }
    const customMenuList = computed(() =>
        localesList.map((code) => ({
            label: `language.${code}`,
            lang: code,
            type: "lang",
            path: '/'
        }))
    )

    const languageMenuItem = computed<MenuItem>(() => ({
        path: '/',
        isOpenMenu: false,
        label: 'language.index',
        icon: 'cwg-lang',
        children: customMenuList.value,
        submenuHeight: 0,
    }))
    const customerBaseMenus = computed<MenuItem[]>(() => [
        {
            isOpenMenu: false,
            submenuHeight: 0,
            path: '/',
            label: 'Shop.Index.Transaction',
            icon: 'crm-trade',
            children: [
                { path: '/pages/customer/index', label: 'Custom.Index.AccountList', icon: 'icon-client' },
                { path: '/pages/customer/trade-history', label: 'Ib.Report.Tit1', icon: 'icon-transfer' },
                { path: '/pages/customer/trade-position', label: 'Ib.Report.Tit4', icon: 'icon-transfer' },
                { path: '/pages/customer/recording-history', label: 'Home.page_customer.item7', icon: 'icon-application' },
            ],
        },
        {
            isOpenMenu: false,
            submenuHeight: 0,
            path: '/',
            label: 'vu.item6',
            icon: 'crm-payment',
            children: [
                { path: '/pages/customer/deposit', label: 'Home.page_customer.item2', icon: 'icon-deposit' },
                { path: '/pages/customer/withdrawal', label: 'Home.page_customer.item3', icon: 'icon-withdrawal' },
                { path: '/pages/customer/payment-history', label: 'Home.page_customer.item4', icon: 'icon-payment' },
                { path: '/pages/customer/transfer', label: 'Custom.Index.Transfer', icon: 'icon-transfer' },
            ],
        },
        {
            path: '/pages/activities/index',
            isOpenMenu: false,
            label: 'Home.page_customer.item6',
            icon: 'crm-hd',
            children: [],
        },
        {
            path: '/',
            isOpenMenu: false,
            label: 'vu.item5',
            icon: 'crm-chart-area',
            children: [
                { path: '/pages/analytics/analystViews', label: 'News.Announcement', icon: 'icon-application' },
                { path: '/pages/analytics/news', label: 'News.NewsInformation', icon: 'icon-application' },
                {
                    path: `https://www.${host}.com/${locale.value}/economic-calendar`,
                    label: 'News.FinancialCalendar',
                    icon: 'icon-application',
                    isExternal: true,
                },
            ],
        },
        {
            path: '/pages/common/download',
            isOpenMenu: false,
            label: 'Downloadpage.item1',
            icon: 'crm-download',
            children: [],
        },
        {
            path: '/pages/common/chat',
            isOpenMenu: false,
            label: 'Downloadpage.item16',
            icon: 'crm-headset',
            children: [],
            type: 'chat',
        },
        {
            path: '/',
            isOpenMenu: false,
            label: 'Custom.Index.Settings',
            icon: 'crm-sz',
            children: [
                { path: '/pages/mine/info?type=1', label: 'PersonalManagement.Title.PersonalInformation', icon: 'crm-headset' },
                { path: '/pages/mine/info?type=2', label: 'PersonalManagement.Title.BankInformation', icon: 'crm-headset' },
                { path: '/pages/mine/info?type=3', label: 'PersonalManagement.Title.FileManagement', icon: 'crm-headset' },
                { path: '/pages/mine/info?type=4', label: 'PersonalManagement.Title.SecurityCenter', icon: 'crm-headset' },
                { path: '/pages/common/notice', label: 'News.Notice', icon: 'crm-headset' },
            ],
        },
    ])
    const ibBaseMenus = computed<MenuItem[]>(() => [
        {
            isOpenMenu: false,
            path: '/pages/ib/index',
            label: 'Documentary.console.item1',
            icon: 'crm-mb',
        },
        {
            path: '/',
            label: 'Ib.Custom.Manage3',
            icon: 'crm-bg',
            children: [
                { path: '/pages/ib/customer', label: 'Ib.Custom.Manage3', icon: 'icon-deposit' },
                { path: '/pages/ib/subsList', label: 'Ib.Custom.Manage2', icon: 'icon-deposit' },
                { path: '/pages/ib/agentList', label: 'Documentary.console.item23', icon: 'icon-deposit' },
                { path: '/pages/ib/accountList', label: 'Ib.Custom.Manage1', icon: 'icon-deposit' }
            ],
        },
        {
            isOpenMenu: false,
            submenuHeight: 0,
            path: '/',
            label: 'vu.item6',
            icon: 'crm-payment',
            children: [
                { path: '/pages/ib/transfer', label: 'Home.page_ib.item4', icon: 'icon-payment' },
                { path: '/pages/ib/withdraw', label: 'Home.page_ib.item5', icon: 'icon-transfer' },
                { path: '/pages/ib/agent-transfer', label: 'Home.page_ib.item9', icon: 'icon-transfer' },
                { path: '/pages/ib/recording', label: 'Home.page_ib.item7', icon: 'icon-application' },
            ],
        },
        {
            isOpenMenu: false,
            path: '/',
            label: 'Home.page_ib.item3',
            icon: 'crm-newspaper',
            children: [
                { path: '/pages/ib/report', label: 'Home.page_ib.item3', icon: 'icon-withdrawal' },
            ],
        },
    ])
    const menus = ref<MenuItem[]>([])

    // 监听 mode 变化，自动导航到对应首页
    watch(mode, (newMode, oldMode) => {
        if (newMode !== oldMode) {
            const base = newMode === 'customer' ? [...customerBaseMenus.value] : [...ibBaseMenus.value]
            if (shouldShowLanguageMenu.value) {
                base.push(languageMenuItem.value)
            }
            menus.value = cloneMenu(base)
        }
    }, { immediate: true })
    // 监听路由变化：自动展开包含当前路径的父菜单，不自动关闭其他菜单
    watch(route, () => {
        const currentPath = route.path
        const shouldOpenIndices: number[] = []
        menus.value.forEach((item, idx) => {
            if (item.children && item.children.length) {
                const isActive = item.children.some(child => {
                    if (child.isExternal || child.type === 'lang') return false
                    return currentPath === child.path || currentPath.startsWith(child.path + '?') || currentPath.startsWith(child.path + '/')
                })
                if (isActive && !item.isOpenMenu) {
                    shouldOpenIndices.push(idx)
                }
            }
        })
        if (shouldOpenIndices.length) {
            shouldOpenIndices.forEach(idx => {
                menus.value[idx].isOpenMenu = true
            })
            nextTick(() => {
                shouldOpenIndices.forEach(idx => updateSubmenuHeight(idx))
            })
        }
    }, { immediate: true })
    watch(windowWidth, handleResize)

    onMounted(() => {
        nextTick(() => {
            menus.value.forEach((item, index) => {
                if (item.isOpenMenu && item.children && item.children.length) {
                    updateSubmenuHeight(index)
                }
            })
        })
    })
    return {
        menus,          // 最终菜单（已克隆，可直接修改 isOpenMenu 等）
        mode,           // 只读或按需使用
        shouldShowLanguageMenu, // 可选，供外部获取状态
        windowWidth,          // 可选，供外部获取宽度（300）
        setMode,              // 可选，供外部设置模式
        setSubmenuRef,        // 可选，供外部设置子菜单引用
        updateSubmenuHeight,  // 可选，供外部更新子菜单高度
        handleClick,          // 可选，供外部处理点击事件
        handleSubmenuClick,   // 可选，供外部处理子菜单点击事件

    }
}