import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import { HOME_PAGE } from '@/router/routesAlias'
import { router } from '@/router'
import { LocationQueryRaw, Router } from 'vue-router'
import { WorkTab } from '@/types'

interface WorktabState {
  current: Partial<WorkTab>
  opened: WorkTab[]
  keepAliveExclude: string[]
}

/**
 * 工作台标签页管理 Store
 */
export const useWorktabStore = defineStore(
  'worktabStore',
  () => {
    // 状态定义
    const current = ref<Partial<WorkTab>>({})
    const opened = ref<WorkTab[]>([])
    const keepAliveExclude = ref<string[]>([])

    // 计算属性
    const hasOpenedTabs = computed(() => opened.value.length > 0)
    const hasMultipleTabs = computed(() => opened.value.length > 1)
    const currentTabIndex = computed(() =>
      current.value.path ? opened.value.findIndex((tab) => tab.path === current.value.path) : -1
    )

    /**
     * 初始化工作台状态（页面刷新后调用）
     * 只保留固定标签页和当前路由对应的标签页
     */
    const initializeAfterRefresh = (currentPath?: string): void => {
      // 保留固定标签页
      const fixedTabs = opened.value.filter((tab) => tab.fixedTab)

      // 如果当前路径存在且不是固定标签页，则将其从已打开的标签页中移除
      if (currentPath) {
        const currentIsFixed = fixedTabs.some((tab) => tab.path === currentPath)
        if (!currentIsFixed) {
          // 移除所有非固定的标签页
          opened.value = fixedTabs
          current.value = {}
        } else {
          // 当前路径是固定标签页，保留所有固定标签页
          opened.value = fixedTabs
          current.value = fixedTabs.find((tab) => tab.path === currentPath) || {}
        }
      } else {
        // 如果没有当前路径，只保留固定标签页
        opened.value = fixedTabs
        current.value = fixedTabs.length > 0 ? fixedTabs[0] : {}
      }
    }

    /**
     * 查询对象比较
     */
    const areQueriesEqual = (
      query1: LocationQueryRaw | undefined,
      query2: LocationQueryRaw | undefined
    ): boolean => {
      if (!query1 && !query2) return true
      if (!query1 || !query2) return false
      return JSON.stringify(query1) === JSON.stringify(query2)
    }

    /**
     * 查找标签页索引
     */
    const findTabIndex = (path: string): number => {
      return opened.value.findIndex((tab) => tab.path === path)
    }

    /**
     * 获取标签页
     */
    const getTab = (path: string): WorkTab | undefined => {
      return opened.value.find((tab) => tab.path === path)
    }

    /**
     * 检查标签页是否可关闭
     */
    const isTabClosable = (tab: WorkTab): boolean => {
      return !tab.fixedTab
    }

    /**
     * 安全的路由跳转
     */
    const safeRouterPush = (tab: Partial<WorkTab>): void => {
      if (!tab.path) {
        console.warn('尝试跳转到无效路径的标签页')
        return
      }

      try {
        router.push({
          path: tab.path,
          query: tab.query as LocationQueryRaw
        })
      } catch (error) {
        console.error('路由跳转失败:', error)
      }
    }

    /**
     * 打开或激活一个选项卡
     */
    const openTab = (tab: WorkTab): void => {
      if (!tab.path) {
        console.warn('尝试打开无效的标签页')
        return
      }

      // 从 keepAlive 排除列表中移除
      if (tab.name) {
        removeKeepAliveExclude(tab.name)
      }

      const existingIndex = findTabIndex(tab.path)

      if (existingIndex === -1) {
        // 新增标签页
        const insertIndex = tab.fixedTab ? findFixedTabInsertIndex() : opened.value.length
        const newTab = { ...tab }

        if (tab.fixedTab) {
          opened.value.splice(insertIndex, 0, newTab)
        } else {
          opened.value.push(newTab)
        }

        current.value = newTab
      } else {
        // 更新现有标签页
        const existingTab = opened.value[existingIndex]

        if (!areQueriesEqual(existingTab.query, tab.query)) {
          opened.value[existingIndex] = {
            ...existingTab,
            query: tab.query,
            title: tab.title || existingTab.title
          }
        }

        current.value = opened.value[existingIndex]
      }
    }

    /**
     * 查找固定标签页的插入位置
     */
    const findFixedTabInsertIndex = (): number => {
      let insertIndex = 0
      for (let i = 0; i < opened.value.length; i++) {
        if (opened.value[i].fixedTab) {
          insertIndex = i + 1
        } else {
          break
        }
      }
      return insertIndex
    }

    /**
     * 关闭指定的选项卡
     */
    const removeTab = (path: string): void => {
      const targetTab = getTab(path)
      const targetIndex = findTabIndex(path)

      if (targetIndex === -1) {
        console.warn(`尝试关闭不存在的标签页: ${path}`)
        return
      }

      if (targetTab && !isTabClosable(targetTab)) {
        console.warn(`尝试关闭固定标签页: ${path}`)
        return
      }

      // 从标签页列表中移除
      opened.value.splice(targetIndex, 1)

      // 处理缓存排除
      if (targetTab?.name) {
        addKeepAliveExclude(targetTab)
      }

      // 如果关闭后无标签页，跳转首页
      if (!hasOpenedTabs.value) {
        if (path !== HOME_PAGE) {
          current.value = {}
          safeRouterPush({ path: HOME_PAGE })
        }
        return
      }

      // 如果关闭的是当前激活标签，需要激活其他标签
      if (current.value.path === path) {
        const newIndex = targetIndex >= opened.value.length ? opened.value.length - 1 : targetIndex
        current.value = opened.value[newIndex]
        safeRouterPush(current.value)
      }
    }

    /**
     * 关闭左侧选项卡
     */
    const removeLeft = (path: string): void => {
      const targetIndex = findTabIndex(path)

      if (targetIndex === -1) {
        console.warn(`尝试关闭左侧标签页，但目标标签页不存在: ${path}`)
        return
      }

      // 获取左侧可关闭的标签页
      const leftTabs = opened.value.slice(0, targetIndex)
      const closableLeftTabs = leftTabs.filter(isTabClosable)

      if (closableLeftTabs.length === 0) {
        console.warn('左侧没有可关闭的标签页')
        return
      }

      // 标记为缓存排除
      markTabsToRemove(closableLeftTabs)

      // 移除左侧可关闭的标签页
      opened.value = opened.value.filter(
        (tab, index) => index >= targetIndex || !isTabClosable(tab)
      )

      // 确保当前标签是激活状态
      const targetTab = getTab(path)
      if (targetTab) {
        current.value = targetTab
      }
    }

    /**
     * 关闭右侧选项卡
     */
    const removeRight = (path: string): void => {
      const targetIndex = findTabIndex(path)

      if (targetIndex === -1) {
        console.warn(`尝试关闭右侧标签页，但目标标签页不存在: ${path}`)
        return
      }

      // 获取右侧可关闭的标签页
      const rightTabs = opened.value.slice(targetIndex + 1)
      const closableRightTabs = rightTabs.filter(isTabClosable)

      if (closableRightTabs.length === 0) {
        console.warn('右侧没有可关闭的标签页')
        return
      }

      // 标记为缓存排除
      markTabsToRemove(closableRightTabs)

      // 移除右侧可关闭的标签页
      opened.value = opened.value.filter(
        (tab, index) => index <= targetIndex || !isTabClosable(tab)
      )

      // 确保当前标签是激活状态
      const targetTab = getTab(path)
      if (targetTab) {
        current.value = targetTab
      }
    }

    /**
     * 关闭其他选项卡
     */
    const removeOthers = (path: string): void => {
      const targetTab = getTab(path)

      if (!targetTab) {
        console.warn(`尝试关闭其他标签页，但目标标签页不存在: ${path}`)
        return
      }

      // 获取其他可关闭的标签页
      const otherTabs = opened.value.filter((tab) => tab.path !== path)
      const closableTabs = otherTabs.filter(isTabClosable)

      if (closableTabs.length === 0) {
        console.warn('没有其他可关闭的标签页')
        return
      }

      // 标记为缓存排除
      markTabsToRemove(closableTabs)

      // 只保留当前标签和固定标签
      opened.value = opened.value.filter((tab) => tab.path === path || !isTabClosable(tab))

      // 确保当前标签是激活状态
      current.value = targetTab
    }

    /**
     * 关闭所有可关闭的标签页
     */
    const removeAll = (): void => {
      const hasFixedTabs = opened.value.some((tab) => tab.fixedTab)

      // 获取可关闭的标签页
      const closableTabs = opened.value.filter((tab) => {
        if (!isTabClosable(tab)) return false
        // 如果有固定标签，则所有可关闭的都可以关闭；否则保留首页
        return hasFixedTabs || tab.path !== HOME_PAGE
      })

      if (closableTabs.length === 0) {
        console.warn('没有可关闭的标签页')
        return
      }

      // 标记为缓存排除
      markTabsToRemove(closableTabs)

      // 保留不可关闭的标签页和首页（当没有固定标签时）
      opened.value = opened.value.filter((tab) => {
        return !isTabClosable(tab) || (!hasFixedTabs && tab.path === HOME_PAGE)
      })

      // 处理激活状态
      if (!hasOpenedTabs.value) {
        current.value = {}
        safeRouterPush({ path: HOME_PAGE })
        return
      }

      // 选择激活的标签页：优先首页，其次第一个可用标签
      const homeTab = opened.value.find((tab) => tab.path === HOME_PAGE)
      const targetTab = homeTab || opened.value[0]

      current.value = targetTab
      safeRouterPush(targetTab)
    }

    /**
     * 将指定选项卡添加到 keepAlive 排除列表中
     */
    const addKeepAliveExclude = (tab: WorkTab): void => {
      if (!tab.keepAlive || !tab.name) return

      if (!keepAliveExclude.value.includes(tab.name)) {
        keepAliveExclude.value.push(tab.name)
      }
    }

    /**
     * 从 keepAlive 排除列表中移除指定组件名称
     */
    const removeKeepAliveExclude = (name: string): void => {
      if (!name) return

      keepAliveExclude.value = keepAliveExclude.value.filter((item) => item !== name)
    }

    /**
     * 将传入的一组选项卡的组件名称标记为排除缓存
     */
    const markTabsToRemove = (tabs: WorkTab[]): void => {
      tabs.forEach((tab) => {
        if (tab.name) {
          addKeepAliveExclude(tab)
        }
      })
    }

    /**
     * 切换指定标签页的固定状态
     */
    const toggleFixedTab = (path: string): void => {
      const targetIndex = findTabIndex(path)

      if (targetIndex === -1) {
        console.warn(`尝试切换不存在标签页的固定状态: ${path}`)
        return
      }

      const tab = { ...opened.value[targetIndex] }
      tab.fixedTab = !tab.fixedTab

      // 移除原位置
      opened.value.splice(targetIndex, 1)

      if (tab.fixedTab) {
        // 固定标签插入到所有固定标签的末尾
        const firstNonFixedIndex = opened.value.findIndex((t) => !t.fixedTab)
        const insertIndex = firstNonFixedIndex === -1 ? opened.value.length : firstNonFixedIndex
        opened.value.splice(insertIndex, 0, tab)
      } else {
        // 非固定标签插入到所有固定标签后
        const fixedCount = opened.value.filter((t) => t.fixedTab).length
        opened.value.splice(fixedCount, 0, tab)
      }

      // 更新当前标签引用
      if (current.value.path === path) {
        current.value = tab
      }
    }

    /**
     * 验证工作台标签页的路由有效性
     */
    const validateWorktabs = (routerInstance: Router): void => {
      try {
        const validPaths = new Set(routerInstance.getRoutes().map((route) => route.path))

        // 过滤出有效的标签页
        const validTabs = opened.value.filter((tab) => validPaths.has(tab.path))

        if (validTabs.length !== opened.value.length) {
          console.warn('发现无效的标签页路由，已自动清理')
          opened.value = validTabs
        }

        // 验证当前激活标签的有效性
        const isCurrentValid =
          current.value.path && validTabs.some((tab) => tab.path === current.value.path)

        if (!isCurrentValid && validTabs.length > 0) {
          console.warn('当前激活标签无效，已自动切换')
          current.value = validTabs[0]
        } else if (!isCurrentValid) {
          current.value = {}
        }
      } catch (error) {
        console.error('验证工作台标签页失败:', error)
      }
    }

    /**
     * 清空所有状态（用于登出等场景）
     */
    const clearAll = (): void => {
      current.value = {}
      opened.value = []
      keepAliveExclude.value = []
    }

    /**
     * 获取状态快照（用于持久化存储）
     */
    const getStateSnapshot = (): WorktabState => {
      return {
        current: { ...current.value },
        opened: [...opened.value],
        keepAliveExclude: [...keepAliveExclude.value]
      }
    }

    return {
      // 状态
      current,
      opened,
      keepAliveExclude,

      // 计算属性
      hasOpenedTabs,
      hasMultipleTabs,
      currentTabIndex,

      // 方法
      openTab,
      removeTab,
      removeLeft,
      removeRight,
      removeOthers,
      removeAll,
      toggleFixedTab,
      validateWorktabs,
      clearAll,
      getStateSnapshot,
      initializeAfterRefresh,

      // 工具方法
      findTabIndex,
      getTab,
      isTabClosable,
      addKeepAliveExclude,
      removeKeepAliveExclude,
      markTabsToRemove
    }
  },
  {
    persist: {
      key: 'worktab',
      storage: localStorage,
      pick: ['opened'],
      // 自定义序列化，只保存固定标签页
      serializer: {
        serialize: (value: any) => {
          const fixedTabs = value.opened?.filter((tab: WorkTab) => tab.fixedTab) || []
          return JSON.stringify({
            opened: fixedTabs,
            keepAliveExclude: value.keepAliveExclude || []
          })
        },
        deserialize: (value: string) => {
          try {
            const parsed = JSON.parse(value)
            return {
              opened: parsed.opened || [],
              keepAliveExclude: parsed.keepAliveExclude || [],
              current: {} // 刷新后不恢复当前标签状态
            }
          } catch {
            return { opened: [], keepAliveExclude: [], current: {} }
          }
        }
      }
    }
  }
)