const DIRECT_ROUTE_PREFIXES = ['pages/', 'page_', 'pages_']

const MENU_ROUTE_MAP = {
  '生产任务': '/pages_function/pages/taskList/index',
  tasklist: '/pages_function/pages/taskList/index',
  '生产计划': '/pages_function/pages/planList/index',
  planlist: '/pages_function/pages/planList/index',
  '生产投料': '/page_record/feedingRecordForm',
  feedingrecordform: '/page_record/feedingRecordForm',
  '生产报工': '/page_report/reportForm',
  reportform: '/page_report/reportForm',
  '代报工': '/page_report/replaceForm',
  replaceform: '/page_report/replaceForm',
  '计划进度': '/page_report/planProgress',
  planprogress: '/page_report/planProgress',
  '仓库信息': '/pages_function/pages/warehouse/index',
  warehouse: '/pages_function/pages/warehouse/index',
  '检验类型': '/pages_function/pages/inspection/index',
  inspection: '/pages_function/pages/inspection/index',
  '检验项库': '/pages_function/pages/inspectionItem/index',
  inspectionitem: '/pages_function/pages/inspectionItem/index',
  moldinspectionitems: '/pages_function/pages/moldInspectionItems/index',
  '检验模板': '/pages_function/pages/inspectionTemplate/index',
  inspectiontemplate: '/pages_function/pages/inspectionTemplate/index',
  moldinspectionplan: '/pages_function/pages/moldInspectionPlan/index',
  '点检模板': '/pages_function/pages/moldInspectionPlan/index',
  '点检任务': '/pages_function/pages/moldTaskConfiguration/index',
  moldtaskconfiguration: '/pages_function/pages/moldTaskConfiguration/index',
  moldtaskconfig: '/pages_function/pages/moldTaskConfiguration/index',
  '点检记录': '/pages_function/pages/moldWorkOrderInquiry/index',
  moldworkorderinquiry: '/pages_function/pages/moldWorkOrderInquiry/index',
  '产品物料分类': '/pages_function/pages/materialCategory/index',
  materialcategory: '/pages_function/pages/materialCategory/index',
  '产品物料信息': '/pages_function/pages/materialInfo/index',
  materialinfo: '/pages_function/pages/materialInfo/index',
  '产品BOM': '/pages_function/pages/productBom/index',
  productbom: '/pages_function/pages/productBom/index',
  '设备分类': '/pages_function/pages/equipmentCategory/index',
  equipmentcategory: '/pages_function/pages/equipmentCategory/index',
  '设备台账': '/pages_function/pages/equipmentLedger/index',
  equipmentledger: '/pages_function/pages/equipmentLedger/index',
  equipmentledgers: '/pages_function/pages/equipmentLedger/index',
  deviceledger: '/pages_function/pages/equipmentLedger/index',
  deviceledgers: '/pages_function/pages/equipmentLedger/index',
  '设备维修': '/pages_function/pages/equipmentMaintenance/index',
  '设备报修': '/pages_function/pages/equipmentMaintenance/index',
  '设备维修工单': '/pages_function/pages/equipmentMaintenance/index',
  equipmentmaintenance: '/pages_function/pages/equipmentMaintenance/index',
  equipmentrepair: '/pages_function/pages/equipmentMaintenance/index',
  devicerepair: '/pages_function/pages/equipmentMaintenance/index',
  dvrepair: '/pages_function/pages/equipmentMaintenance/index',
  '设备点检任务': '/pages_function/pages/equipmentInspectionTasks/index',
  '设备点检工单': '/pages_function/pages/equipmentInspectionTasks/index',
  equipmentinspectiontasks: '/pages_function/pages/equipmentInspectionTasks/index',
  equipmentinspectiontask: '/pages_function/pages/equipmentInspectionTasks/index',
  deviceinspectiontasks: '/pages_function/pages/equipmentInspectionTasks/index',
  deviceinspectiontask: '/pages_function/pages/equipmentInspectionTasks/index',
  taskmanagement: '/pages_function/pages/equipmentInspectionTasks/index',
  '设备点检记录': '/pages_function/pages/equipmentInspectionRecord/index',
  '设备点检记录查询': '/pages_function/pages/equipmentInspectionRecord/index',
  equipmentinspectionrecord: '/pages_function/pages/equipmentInspectionRecord/index',
  equipmentinspectionrecords: '/pages_function/pages/equipmentInspectionRecord/index',
  deviceinspectionrecord: '/pages_function/pages/equipmentInspectionRecord/index',
  deviceinspectionrecords: '/pages_function/pages/equipmentInspectionRecord/index',
  '设备关键件': '/pages_function/pages/criticalComponent/index',
  criticalcomponent: '/pages_function/pages/criticalComponent/index',
  equipmentkeypart: '/pages_function/pages/equipmentKeypart/index',
  '模具类型': '/pages_function/pages/moldType/index',
  moldtype: '/pages_function/pages/moldType/index',
  '模具台账': '/pages_function/pages/moldLedger/index',
  moldledger: '/pages_function/pages/moldLedger/index',
  moldget: '/pages_function/pages/moldget/index',
  moldreturn: '/pages_function/pages/moldreturn/index',
  moldoperate: '/pages_function/pages/moldoperate/index',
  mold: '/pages_function/pages/mold/index',
  equipment: '/pages_function/pages/equipment/index',
  spare: '/pages_function/pages/spare/index',
  keypart: '/pages_function/pages/keypart/index',
  product: '/pages_function/pages/product/index'
}

const HOME_KEYWORDS = ['首页', 'home', 'index', 'dashboard']
const MODULE_COLORS = ['#1a3a5c', '#2d5a87', '#3d7ab5', '#ff8c00', '#18bc37', '#5aa0d2']
const MENU_SYMBOLS = ['●', '■', '▲', '◆', '★', '▣']

function toArray(value) {
  return Array.isArray(value) ? value : []
}

function walkMenus(menus, visitor, parent = null) {
  toArray(menus).forEach((menu, index) => {
    if (!menu || typeof menu !== 'object') {
      return
    }
    visitor(menu, parent, index)
    const children = toArray(menu.children)
    if (children.length > 0) {
      walkMenus(children, visitor, menu)
    }
  })
}

function normalizeMenuKey(value) {
  return String(value || '')
    .trim()
    .toLowerCase()
    .replace(/\/index$/i, '')
    .replace(/[^a-z0-9\u4e00-\u9fa5]/g, '')
}

function getDirectRoute(value) {
  const route = String(value || '').trim().replace(/^\/+/, '')
  if (!route) return ''
  return DIRECT_ROUTE_PREFIXES.some((prefix) => route.startsWith(prefix)) ? `/${route}` : ''
}

function looksLikeHomeMenu(menu) {
  const fields = [menu.name, menu.enName, menu.path, menu.component]
    .map((item) => String(item || '').toLowerCase())
    .join('|')
  return HOME_KEYWORDS.some((keyword) => fields.includes(keyword))
}

function wrapGroupEntries(group) {
  const directChildren = toArray(group.children)
  const hasNestedEntries = directChildren.some((child) => toArray(child.children).length > 0)
  if (hasNestedEntries) {
    return directChildren
      .map((child) => ({
        ...child,
        children: toArray(child.children)
      }))
      .filter((child) => child.children.length > 0)
  }
  if (directChildren.length === 0) {
    return []
  }
  return [
    {
      id: `${group.id || group.name || 'group'}-entries`,
      name: group.name,
      children: directChildren
    }
  ]
}

export function getTopLevelMenus(menus) {
  return toArray(menus).filter((menu) => menu && typeof menu === 'object')
}

export function flattenMenus(menus) {
  const result = []
  walkMenus(menus, (menu, parent, index) => {
    result.push({
      ...menu,
      _parent: parent || null,
      _levelIndex: index
    })
  })
  return result
}

export function getConfigurableNavMenus(menus) {
  const dedupe = new Set()
  return flattenMenus(menus).filter((menu) => {
    if (menu.type !== 2 || menu.id == null || dedupe.has(menu.id)) {
      return false
    }
    dedupe.add(menu.id)
    return true
  })
}

export function buildNavMenuViewModels(menus) {
  return getConfigurableNavMenus(menus).map((menu, index) => {
    const displayName = String(menu.name || menu.enName || '').trim() || `菜单${index + 1}`
    return {
      ...menu,
      displayName,
      route: resolveMenuUrl(menu),
      symbol: getMenuSymbol(displayName, index),
      accentColor: getModuleColor(index)
    }
  })
}

export function getTabBarMenus(menus) {
  return getTopLevelMenus(menus)
    .filter((menu) => menu && menu.visible !== false)
    .map((menu) => {
      const path = resolveMenuUrl(menu)
      if (!path) {
        return null
      }
      return {
        ...menu,
        path
      }
    })
    .filter(Boolean)
}

export function getMineTabBarPath() {
  return '/pages/mine'
}

export function getFirstTabBarPath(menus, fallback = getMineTabBarPath()) {
  return getTabBarMenus(menus)[0]?.path || fallback
}

export function getDynamicTabMenus(menus) {
  return getTopLevelMenus(menus).filter((menu) => !looksLikeHomeMenu(menu))
}

function normalizePagePath(value) {
  const path = String(value || '').trim().replace(/^\/+/, '')
  return path ? `/${path}` : ''
}

export function findTabMenuByPage(menus, pagePath) {
  const dynamicMenus = getDynamicTabMenus(menus)
  const targetPath = normalizePagePath(pagePath)
  if (!targetPath) {
    return null
  }

  return dynamicMenus.find((menu) => normalizePagePath(resolveMenuUrl(menu)) === targetPath) || null
}

export function buildPageModules(tabMenu) {
  return toArray(tabMenu?.children)
    .map((module) => {
      const directChildren = toArray(module.children)
      const hasNestedEntries = directChildren.some((child) => toArray(child.children).length > 0)
      if (hasNestedEntries) {
        return {
          ...module,
          children: directChildren.flatMap((child) => toArray(child.children))
        }
      }
      return {
        ...module,
        children: directChildren
      }
    })
    .filter((module) => (module.children || []).length > 0)
}

export function resolveMenuUrl(menu) {
  if (String(menu?.path || '').trim() === '/' || String(menu?.component || '').trim() === '/') {
    return '/pages/index'
  }

  const directRoute = getDirectRoute(menu?.path) || getDirectRoute(menu?.component)
  if (directRoute) {
    return directRoute
  }

  const keys = [menu?.component, menu?.path, menu?.enName, menu?.name]
  for (const key of keys) {
    const normalizedKey = normalizeMenuKey(key)
    if (normalizedKey && MENU_ROUTE_MAP[normalizedKey]) {
      return MENU_ROUTE_MAP[normalizedKey]
    }
  }

  return ''
}

export function getModuleColor(index) {
  return MODULE_COLORS[index % MODULE_COLORS.length]
}

export function getMenuSymbol(name, index) {
  const trimmed = String(name || '').trim()
  if (trimmed) {
    return trimmed.slice(0, 1)
  }
  return MENU_SYMBOLS[index % MENU_SYMBOLS.length]
}

export function syncTabBarMenus(menus, options = {}) {
  const reportMenu = findTabMenuByPage(menus, 'pages/report')
  const workMenu = findTabMenuByPage(menus, 'pages/work')
  return [
    options.homeText || '首页',
    reportMenu?.name || options.reportFallback || '报表',
    workMenu?.name || reportMenu?.name || options.workFallback || '管理',
    options.mineText || '我的'
  ]
}