import { defineStore } from 'pinia'
import { computed, ref, watch } from 'vue'
import { normalizeError } from '@/services/error'
import { menuApi, type MenuNode } from '@/services/modules/menu'

export interface LayoutMenuItem {
  title: string
  path?: string
  icon?: string
  navigable?: boolean
  subItems?: LayoutMenuItem[]
}

export const useMenuStore = defineStore('menu', () => {
  const menu = ref<MenuNode[]>([])
  const favorite = ref<MenuNode[]>([])
  const isRail = ref(false)
  const error = ref<string | null>(null)
  const loading = ref(false)

  const menuStorageKey = 'sk_playground_menu'
  const favoriteStorageKey = 'sk_playground_favorite'
  const isRailStorageKey = 'sk_playground_is_rail'

  const readNodes = (key: string): MenuNode[] => {
    if (typeof window === 'undefined') return []
    try {
      const raw = window.localStorage.getItem(key)
      if (!raw) return []
      const parsed = JSON.parse(raw)
      return Array.isArray(parsed) ? (parsed as MenuNode[]) : []
    } catch {
      return []
    }
  }

  const readBoolean = (key: string, defaultValue = false): boolean => {
    if (typeof window === 'undefined') return defaultValue
    try {
      const raw = window.localStorage.getItem(key)
      return raw === null ? defaultValue : raw === 'true'
    } catch {
      return defaultValue
    }
  }

  const writeValue = (key: string, value: any) => {
    if (typeof window === 'undefined') return
    try {
      window.localStorage.setItem(key, String(value))
    } catch {
      return
    }
  }

  const writeNodes = (key: string, nodes: MenuNode[]) => {
    if (typeof window === 'undefined') return
    try {
      window.localStorage.setItem(key, JSON.stringify(nodes))
    } catch {
      return
    }
  }

  const removeValue = (key: string) => {
    if (typeof window === 'undefined') return
    try {
      window.localStorage.removeItem(key)
    } catch {
      return
    }
  }

  const hydrate = () => {
    menu.value = readNodes(menuStorageKey)
    favorite.value = readNodes(favoriteStorageKey)
    isRail.value = readBoolean(isRailStorageKey)
  }

  hydrate()

  const toLayoutMenuItems = (nodes: MenuNode[]): LayoutMenuItem[] => {
    const getString = (node: MenuNode, key: string): string | undefined => {
      const v = node?.[key]
      return typeof v === 'string' ? v : undefined
    }

    const getChildren = (node: MenuNode): MenuNode[] => {
      return Array.isArray(node?.children) ? (node.children as MenuNode[]) : []
    }

    return nodes
      .map((mdl) => {
        const mdlTitle = getString(mdl, 'mdl_name') ?? ''
        const untItems = getChildren(mdl)
          .map((unt) => {
            const untTitle = getString(unt, 'unt_name') ?? ''
            const fncItems = getChildren(unt)
              .map((fnc) => {
                const fncTitle = getString(fnc, 'fnc_name') ?? ''
                const fncId = getString(fnc, 'fnc_id')
                return {
                  title: fncTitle,
                  path: fncId ? `/${fncId}` : undefined,
                } satisfies LayoutMenuItem
              })
              .filter((x) => x.title)

            return {
              title: untTitle,
              navigable: false,
              subItems: fncItems,
            } satisfies LayoutMenuItem
          })
          .filter((x) => x.title)

        return {
          title: mdlTitle,
          navigable: false,
          subItems: untItems,
        } satisfies LayoutMenuItem
      })
      .filter((x) => x.title)
  }

  const toFavoriteLayoutMenuItems = (nodes: MenuNode[]): LayoutMenuItem[] => {
    const getString = (node: MenuNode, key: string): string | undefined => {
      const v = node?.[key]
      return typeof v === 'string' ? v : undefined
    }

    const getChildren = (node: MenuNode): MenuNode[] => {
      return Array.isArray(node?.children) ? (node.children as MenuNode[]) : []
    }

    return nodes
      .map((unt) => {
        const untTitle = getString(unt, 'unt_name') ?? ''
        const fncItems = getChildren(unt)
          .map((fnc) => {
            const fncTitle = getString(fnc, 'fnc_name') ?? ''
            const fncId = getString(fnc, 'fnc_id')
            return {
              title: fncTitle,
              path: fncId ? `/${fncId}` : undefined,
            } satisfies LayoutMenuItem
          })
          .filter((x) => x.title)

        return {
          title: untTitle,
          navigable: false,
          subItems: fncItems,
        } satisfies LayoutMenuItem
      })
      .filter((x) => x.title)
  }

  const menuItems = computed<LayoutMenuItem[]>(() => toLayoutMenuItems(menu.value))
  const favoriteItems = computed<LayoutMenuItem[]>(() => toFavoriteLayoutMenuItems(favorite.value))

  watch(
    menu,
    (val) => {
      writeNodes(menuStorageKey, val)
    },
    { deep: true }
  )

  watch(
    favorite,
    (val) => {
      writeNodes(favoriteStorageKey, val)
    },
    { deep: true }
  )

  watch(isRail, (val) => {
    writeValue(isRailStorageKey, val)
  })

  const clear = () => {
    menu.value = []
    favorite.value = []
    isRail.value = false
    error.value = null
    removeValue(menuStorageKey)
    removeValue(favoriteStorageKey)
    removeValue(isRailStorageKey)
  }

  const getMenu = async (id: string) => {
    try {
      loading.value = true
      const res = await menuApi.getMenu({ userID: id })
      menu.value = Array.isArray(res.data.data) ? (res.data.data as MenuNode[]) : []
    } catch (error_) {
      const normalizedError = normalizeError(error_)
      if (normalizedError.name !== 'CanceledRequestError') {
        error.value = normalizedError.message
      }
      throw normalizedError
    } finally {
      loading.value = false
    }
  }

  const getFavorite = async (id: string) => {
    try {
      loading.value = true
      const res = await menuApi.getFavorite({ userID: id })
      favorite.value = Array.isArray(res.data.data) ? (res.data.data as MenuNode[]) : []
    } catch (error_) {
      const normalizedError = normalizeError(error_)
      if (normalizedError.name !== 'CanceledRequestError') {
        error.value = normalizedError.message
      }
      throw normalizedError
    } finally {
      loading.value = false
    }
  }

  return {
    menu,
    favorite,
    isRail,
    menuItems,
    favoriteItems,
    error,
    loading,
    hydrate,
    clear,
    getMenu,
    getFavorite,
  }
})