'use client'

import { useEffect, useState } from 'react'
import Link from 'next/link'
import { useRouter } from 'next/navigation'
import { signOut } from 'next-auth/react'
import type { Session } from 'next-auth'
import type { ReactNode } from 'react'
import BrandLogo from '@/components/BrandLogo'
import { DEFAULT_LOGIN_LOGO_URL } from '@/lib/brand-assets'

/*
 * BoardShell —— 品牌中心看板顶层骨架（云采石场 · seed 32cb33b5 世界内扩展）
 * 顶栏=白色石材地面上的切割导航：当前板块以切割蓝垫层高亮，规划中板块保持"未开采"不可点状态；
 * 供看板骨架首页（/）与组织管理（/organization）共用，后续各板块入住时沿用同一顶栏。
 */

export type BoardSection = 'dashboard' | 'organization' | 'assets' | 'business' | 'governance'

interface BoardShellProps {
  session?: Session | null
  active: BoardSection
  children: ReactNode
}

const ADMIN_ROLES = ['ADMIN', 'SYSTEM_ADMIN', 'DEPT_ADMIN']

const NAV_ITEMS: Array<{
  key: BoardSection
  label: string
  href?: string
  planned?: boolean
  plannedLabel?: string
  adminOnly?: boolean
}> = [
  { key: 'dashboard', label: '中心仪表盘', href: '/' },
  { key: 'assets', label: '创意资产库', href: '/materials' },
  { key: 'organization', label: '组织管理', href: '/organization', adminOnly: true },
  { key: 'business', label: '业务经营', planned: true },
  { key: 'governance', label: '治理与设置', planned: true },
]

export default function BoardShell({ session, active, children }: BoardShellProps) {
  const router = useRouter()
  // 本壳顶栏为浅色，用浅底适配版 logo（loginLogoUrl）；深底版仅用于素材库黑色顶栏
  const [brandLogoUrl, setBrandLogoUrl] = useState(DEFAULT_LOGIN_LOGO_URL)

  useEffect(() => {
    const loadSettings = async () => {
      try {
        const response = await fetch('/api/system-settings')
        if (response.ok) {
          const settings = await response.json()
          setBrandLogoUrl(settings.loginLogoUrl || DEFAULT_LOGIN_LOGO_URL)
        }
      } catch {
        // 设置加载失败时保留默认 logo
      }
    }
    void loadSettings()
  }, [])
  const sessionUser = session?.user as
    | {
        role?: string
        name?: string | null
        realName?: string | null
        username?: string | null
      }
    | undefined
  const isAdmin = ADMIN_ROLES.includes(sessionUser?.role || '')
  const displayName = sessionUser?.realName || sessionUser?.name || sessionUser?.username || '成员'

  const handleSignOut = async () => {
    try {
      await signOut({ redirect: false })
      await new Promise((resolve) => setTimeout(resolve, 100))
    } finally {
      router.push('/login')
      router.refresh()
    }
  }

  const visibleItems = NAV_ITEMS.filter((item) => !item.adminOnly || isAdmin)

  const renderNavItem = (item: (typeof visibleItems)[number], compact = false) => {
    if (item.planned) {
      return (
        <span
          key={item.key}
          aria-disabled="true"
          title="规划中，尚未开放"
          className={`flex cursor-not-allowed items-center gap-1.5 text-[#6b7075] ${
            compact ? 'px-2.5 py-1.5 text-[12px]' : 'px-3 py-2 text-[13px]'
          }`}
        >
          {item.label}
          <span className="bg-[#eef0f3] px-1.5 py-0.5 text-[10px]">{item.plannedLabel ?? '规划中'}</span>
        </span>
      )
    }
    const isActive = active === item.key
    return (
      <Link
        key={item.key}
        href={item.href ?? '/'}
        aria-current={isActive ? 'page' : undefined}
        className={`transition-colors ${compact ? 'px-2.5 py-1.5 text-[12px]' : 'px-3 py-2 text-[13px]'} ${
          isActive
            ? 'bg-[#eef0fa] font-semibold text-[#1a1c1d] shadow-[inset_0_-2px_0_#5a66b8]'
            : 'text-[#1a1c1d] hover:bg-[#f3f5f7]'
        }`}
      >
        {item.label}
      </Link>
    )
  }

  return (
    <div className="min-h-screen bg-[#fafafa] text-[#1a1c1d]">
      <header className="sticky top-0 z-40 border-b border-[#dfe4e9] bg-white">
        <div className="mx-auto flex h-[60px] max-w-[1400px] items-center gap-4 px-5">
          <Link
            href="/"
            className="flex min-w-0 items-center gap-2.5"
            aria-label="回到品牌中心看板"
          >
            <BrandLogo
              src={brandLogoUrl}
              fallbackSrc={DEFAULT_LOGIN_LOGO_URL}
              alt=""
              width={32}
              height={32}
              unoptimized
              className="h-8 w-8 shrink-0 rounded-md object-cover"
            />
            <span className="truncate text-[16px] font-bold tracking-tight text-[#1a1c1d]">
              由壹点·品牌中心
            </span>
          </Link>

          {/* 桌面端板块导航 */}
          <nav
            className="ml-auto hidden items-center gap-1 md:flex"
            aria-label="看板板块导航"
          >
            {visibleItems.map((item) => renderNavItem(item))}
          </nav>

          <div className="ml-auto flex items-center gap-2.5 md:ml-0">
            <span className="hidden max-w-[9rem] truncate text-[12px] text-[#1a1c1d] sm:inline">
              {displayName}
            </span>
            <button
              type="button"
              onClick={() => void handleSignOut()}
              className="border border-[#d5dae0] px-2.5 py-1.5 text-[12px] text-[#1a1c1d] transition-colors hover:border-[#5a66b8] hover:text-[#5a66b8] focus:outline-none focus-visible:ring-2 focus-visible:ring-[#5a66b8]/40"
            >
              退出
            </button>
          </div>
        </div>

        {/* 移动端板块导航：横向滚动 */}
        <nav
          className="flex items-center gap-1 overflow-x-auto border-t border-[#eef0f3] px-4 py-1.5 md:hidden"
          aria-label="看板板块导航"
        >
          {visibleItems.map((item) => renderNavItem(item, true))}
        </nav>
      </header>
      <main>{children}</main>
    </div>
  )
}