/**
 * 底栏路由对齐：高亮只认当前页 path
 * 动画优先打到官方 custom-tab-bar 单例，页内 ThemeTabBar 只作占位/兜底
 * 真机用本地 PNG：微信会丢掉内联 SVG mask，只剩色块
 * 套餐项受 features.package_enabled 控制，pages.json 仍声明 4 个 tab
 */

import { getThemeFeatures } from '@/utils/theme'

export const ALL_TAB_PAGES = [
  { pagePath: 'pages/goods/index', text: '首页', key: 'home', icon: '/static/tabbar/v2/home.png', iconOn: '/static/tabbar/v2/home-fill.png' },
  { pagePath: 'pages/package/index', text: '套餐', key: 'package', icon: '/static/tabbar/v2/package.png', iconOn: '/static/tabbar/v2/package-fill.png' },
  { pagePath: 'pages/order/list', text: '订单', key: 'order', icon: '/static/tabbar/v2/order.png', iconOn: '/static/tabbar/v2/order-fill.png' },
  { pagePath: 'pages/mine/mine', text: '我', key: 'mine', icon: '/static/tabbar/v2/mine.png', iconOn: '/static/tabbar/v2/mine-fill.png' },
]

/** 兼容旧引用：默认全量；运行时请用 getTabPages() */
export const TAB_PAGES = ALL_TAB_PAGES

/** 按应用开关过滤自定义底栏，关套餐时回到 3 项 */
export function getTabPages() {
  const enabled = getThemeFeatures().package_enabled
  return ALL_TAB_PAGES.filter((item) => item.key !== 'package' || enabled)
}

let nativeBar = null
let pageBar = null
const barsByRoute = {}
let pendingIndex = -1
let lastSelected = 0

export function getLastSelected() {
  return lastSelected
}

export function setLastSelected(index) {
  if (index >= 0) lastSelected = index
}

export function normalizeRoute(route) {
  return String(route || '').replace(/^\//, '').split('?')[0]
}

export function currentRoute() {
  const pages = getCurrentPages()
  const last = pages[pages.length - 1]
  return last ? normalizeRoute(last.route) : ''
}

export function currentTabIndex() {
  const path = currentRoute()
  return getTabPages().findIndex((item) => item.pagePath === path)
}

export function registerNativeTabBar(vm) {
  nativeBar = vm
}

export function unregisterNativeTabBar(vm) {
  if (nativeBar === vm) nativeBar = null
}

export function peekNativeBar() {
  return nativeBar
}

export function registerPageTabBar(vm) {
  pageBar = vm
}

export function unregisterPageTabBar(vm) {
  if (pageBar === vm) pageBar = null
  Object.keys(barsByRoute).forEach((key) => {
    if (barsByRoute[key] === vm) delete barsByRoute[key]
  })
}

/** Vue3 官方栏经常包一层 $vm，统一拆到带 syncFromRoute 的实例 */
export function unwrapTabBar(bar) {
  if (!bar) return null
  if (typeof bar.syncFromRoute === 'function') return bar
  if (bar.$vm && typeof bar.$vm.syncFromRoute === 'function') return bar.$vm
  const refs = (bar.$refs) || (bar.$vm && bar.$vm.$refs) || {}
  const child = refs.bar
  if (child && typeof child.syncFromRoute === 'function') return child
  if (child && child.$vm && typeof child.$vm.syncFromRoute === 'function') return child.$vm
  return null
}

/** 优先官方单例，没有再拿当前页那一份 */
export function resolvePageTabBar(ctx) {
  if (nativeBar && typeof nativeBar.syncFromRoute === 'function') return nativeBar
  try {
    if (ctx && typeof ctx.getTabBar === 'function') {
      const official = unwrapTabBar(ctx.getTabBar())
      if (official) {
        nativeBar = official
        return official
      }
    }
  } catch (err) {
    /* 官方栏未就绪 */
  }
  let bar = null
  const refs = ctx && ctx.$refs ? ctx.$refs : {}
  bar = refs.themeTabBar
  if (Array.isArray(bar)) bar = bar[0]
  bar = unwrapTabBar(bar)
  if (!bar) {
    try {
      if (ctx && typeof ctx.selectComponent === 'function') {
        bar = unwrapTabBar(ctx.selectComponent('#themeTabBar') || ctx.selectComponent('.theme-tab-bar'))
      }
    } catch (err) {
      bar = null
    }
  }
  const path = currentRoute()
  if (!bar) bar = unwrapTabBar((path && barsByRoute[path]) || pageBar)
  if (bar) {
    pageBar = bar
    if (path) barsByRoute[path] = bar
    return bar
  }
  return null
}

export function setPendingTab(index) {
  pendingIndex = index
}

export function peekPendingTab() {
  return pendingIndex
}

export function consumePendingTab() {
  const value = pendingIndex
  pendingIndex = -1
  return value
}

/**
 * 点底栏：记下起点和目标。不要在 switchTab complete 里清掉，
 * 微信 complete 经常在旧页还是栈顶时就触发，清掉就播不出滑动。
 */
export function markTabTap(fromIndex, toIndex) {
  if (fromIndex >= 0) lastSelected = fromIndex
  pendingIndex = toIndex
}

/** 目标页对上对齐才算这次点击，并吃掉，避免 onShow 再滑一次 */
export function takeTabTap(index) {
  if (pendingIndex !== index) return false
  pendingIndex = -1
  return true
}

/** switchTab 失败：清掉点击，栏保持旧高亮 */
export function clearTabTap() {
  pendingIndex = -1
}

/**
 * 官方栏已是 custom:true，再调 hideTabBar 会抛
 * hideTabBar:fail custom Tabbar，这里刻意空实现
 */
export function hideNativeTabBar() {}

/**
 * 把底栏 selected 对齐到栈顶路由
 * 先打官方单例，保证胶囊/圆点是同一颗在滑
 */
export function syncTabBarByRoute(ctx, extra) {
  const selected = currentTabIndex()
  if (selected < 0) return
  const apply = (bar) => {
    const vm = unwrapTabBar(bar)
    if (!vm) return false
    if (typeof vm.syncFromRoute === 'function') {
      vm.syncFromRoute(selected, extra || {})
      return true
    }
    if (typeof vm.setData === 'function') {
      vm.setData({ selected })
      return true
    }
    return false
  }
  if (apply(resolvePageTabBar(ctx))) return
  try {
    if (apply(ctx && typeof ctx.getTabBar === 'function' ? ctx.getTabBar() : null)) return
  } catch (err) {
    /* 官方栏未就绪 */
  }
  setTimeout(() => {
    try {
      apply(ctx && typeof ctx.getTabBar === 'function' ? ctx.getTabBar() : null)
      apply(resolvePageTabBar(ctx))
    } catch (err) {
      /* 重试失败忽略 */
    }
  }, 80)
}