import { create } from 'zustand'

export interface AppTab {
  id: string
  type: 'book' | 'settings'
  name: string
  bookId?: string
}

interface TabState {
  openTabs: AppTab[]
  activeTabId: string | null
  openBookTab: (bookId: string, name: string) => void
  openSettingsTab: () => void
  switchTab: (tabId: string) => void
  closeTab: (tabId: string) => string | null
}

export const useTabStore = create<TabState>((set, get) => ({
  openTabs: [],
  activeTabId: null,
  openBookTab: (bookId, name) => {
    const existing = get().openTabs.find((t) => t.type === 'book' && t.bookId === bookId)
    if (existing) {
      set({ activeTabId: existing.id })
      return
    }
    const id = `book-${bookId}`
    set((s) => ({
      openTabs: [...s.openTabs, { id, type: 'book', name, bookId }],
      activeTabId: id
    }))
  },
  openSettingsTab: () => {
    const existing = get().openTabs.find((t) => t.type === 'settings')
    if (existing) {
      set({ activeTabId: existing.id })
      return
    }
    set((s) => ({
      openTabs: [...s.openTabs, { id: 'settings', type: 'settings', name: '系统设置' }],
      activeTabId: 'settings'
    }))
  },
  switchTab: (tabId) => set({ activeTabId: tabId }),
  closeTab: (tabId) => {
    const { openTabs, activeTabId } = get()
    const idx = openTabs.findIndex((t) => t.id === tabId)
    if (idx === -1) return activeTabId
    const nextTabs = openTabs.filter((t) => t.id !== tabId)
    let nextActive = activeTabId
    if (activeTabId === tabId) {
      nextActive = nextTabs[Math.max(0, idx - 1)]?.id ?? null
    }
    set({ openTabs: nextTabs, activeTabId: nextActive })
    return nextActive
  }
}))