'use client'

import { useEffect, useState, Suspense } from 'react'
import { useRouter, useSearchParams } from 'next/navigation'
import Image from 'next/image'
import BrandLogo from '@/components/BrandLogo'
import { parseApiError, parseFetchError } from '@/lib/error-handler'
import { DEFAULT_LOGIN_LOGO_URL, DEFAULT_SITE_NAME } from '@/lib/brand-assets'

interface Department {
  id: string
  name: string
}

function CompleteProfileContent() {
  const router = useRouter()
  const searchParams = useSearchParams()
  
  const [department, setDepartment] = useState('')
  const [departments, setDepartments] = useState<Department[]>([])
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState('')
  const [success, setSuccess] = useState('')
  const [userInfo, setUserInfo] = useState<any>(null)

  // 系统设置
  const [loginLogoUrl, setLoginLogoUrl] = useState(DEFAULT_LOGIN_LOGO_URL)
  const [siteName, setSiteName] = useState(DEFAULT_SITE_NAME)

  useEffect(() => {
    // 加载系统设置
    const loadSettings = async () => {
      try {
        const response = await fetch('/api/system-settings')
        if (response.ok) {
          const settings = await response.json()
          setLoginLogoUrl(settings.loginLogoUrl || DEFAULT_LOGIN_LOGO_URL)
          setSiteName(settings.siteName || DEFAULT_SITE_NAME)
        }
      } catch (error) {
        console.error('加载系统设置失败:', error)
      }
    }

    // 加载部门列表
    const loadDepartments = async () => {
      try {
        const response = await fetch('/api/departments')
        if (response.ok) {
          const data = await response.json()
          setDepartments(data || [])
        }
      } catch (error) {
        console.error('加载部门列表失败:', error)
      }
    }

    // 从URL参数获取用户信息
    const userInfoParam = searchParams?.get('userInfo')
    if (userInfoParam) {
      try {
        const info = JSON.parse(decodeURIComponent(userInfoParam))
        setUserInfo(info)
      } catch (error) {
        console.error('解析用户信息失败:', error)
        setError('无效的用户信息，请重新登录')
      }
    } else {
      setError('缺少用户信息，请重新登录')
    }

    loadSettings()
    loadDepartments()
  }, [searchParams])

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError('')

    if (!department) {
      setError('请选择部门')
      return
    }

    setLoading(true)
    setError('') // 清空错误信息
    setSuccess('') // 清空成功信息

    try {
      // 调用API完善用户信息（只需要选择部门）
      const response = await fetch('/api/dingtalk/complete-profile', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          userId: userInfo?.id,
          department,
        }),
      })

      const data = await response.json()

      if (!response.ok || !data.success) {
        throw new Error(data.message || '信息提交失败')
      }

      // 如果是账号关联（关联到已有账号），提示用户使用原账号密码登录
      if (data.isAccountLink) {
        setSuccess('账号关联成功！正在跳转到登录页面，您可以使用原账号密码登录或继续使用钉钉扫码登录。')
        setTimeout(() => {
          // 智能跳转：保持在内网或外网环境
          if (typeof window !== 'undefined' && window.location.hostname.includes('192.168.')) {
            window.location.href = `${window.location.origin}/login`
          } else {
            router.push('/login')
          }
        }, 3000)
        return
      }

      // 检查新用户是否已激活
      if (data.user && !data.user.isActive) {
        setSuccess('信息提交成功！您的账号需要管理员激活后才能登录使用。')
        setTimeout(() => {
          // 智能跳转：保持在内网或外网环境
          if (typeof window !== 'undefined' && window.location.hostname.includes('192.168.')) {
            window.location.href = `${window.location.origin}/login`
          } else {
            router.push('/login')
          }
        }, 3000)
        return
      }

      setSuccess('信息提交成功')
      router.push('/')
      router.refresh()
    } catch (error: any) {
      console.error('提交失败:', error)
      const { message } = parseApiError(error)
      setError(message)
    } finally {
      setLoading(false)
    }
  }

  if (error && !userInfo) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-primary-50 to-primary-100 p-4">
        <div className="max-w-md w-full bg-white rounded-2xl shadow-xl p-8">
          <div className="text-center">
            <div className="mb-4">
              <svg className="mx-auto h-12 w-12 text-red-500" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
              </svg>
            </div>
            <h2 className="text-xl font-semibold mb-2 text-red-600">出错了</h2>
            <p className="text-gray-600 mb-4">{error}</p>
            <button
              onClick={() => router.push('/login')}
              className="btn-primary"
            >
              返回登录
            </button>
          </div>
        </div>
      </div>
    )
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-primary-50 to-primary-100 p-4">
      <div className="max-w-md w-full">
        {/* Logo */}
        <div className="text-center mb-8">
          <div className="flex justify-center mb-4">
            <BrandLogo
              src={loginLogoUrl}
              fallbackSrc={DEFAULT_LOGIN_LOGO_URL}
              alt={siteName}
              width={80}
              height={80}
              unoptimized
              className="rounded-apple shadow-apple"
            />
          </div>
          <h1 className="text-3xl font-bold text-gray-900">完善个人信息</h1>
          <p className="text-gray-600 mt-2">首次登录，请完善您的用户信息</p>
        </div>

        {/* Form */}
        <div className="card-apple p-8">
          {userInfo && (
            <div className="mb-6 p-4 bg-blue-50 rounded-lg border border-blue-200">
              <div className="flex items-center gap-3">
                {userInfo.avatar && (
                  <Image
                    src={userInfo.avatar}
                    alt={userInfo.realName}
                    width={48}
                    height={48}
                    className="rounded-full"
                    unoptimized
                  />
                )}
                <div>
                  <p className="text-sm text-gray-600">钉钉账号</p>
                  <p className="font-medium text-gray-900">{userInfo.realName}</p>
                </div>
              </div>
            </div>
          )}

          <form onSubmit={handleSubmit} className="space-y-6">
            {error && (
              <div className="bg-red-50 border border-red-200 text-red-600 px-4 py-3 rounded-apple text-sm">
                {error}
              </div>
            )}
            
            {success && (
              <div className="bg-green-50 border border-green-200 text-green-600 px-4 py-3 rounded-apple text-sm">
                {success}
              </div>
            )}

            {/* 显示钉钉用户名（只读） */}
            <div>
              <label className="block text-sm font-medium text-gray-700 mb-2">
                用户名
              </label>
              <div className="input-apple bg-gray-50 text-gray-700 cursor-not-allowed">
                {userInfo?.username || userInfo?.realName || '加载中...'}
              </div>
              <p className="mt-1 text-xs text-gray-500">使用您的钉钉姓名作为系统用户名</p>
            </div>

            <div>
              <label className="block text-sm font-medium text-gray-700 mb-2">
                所属部门 *
              </label>
              <select
                value={department}
                onChange={(e) => setDepartment(e.target.value)}
                className="input-apple"
                required
              >
                <option value="">请选择部门</option>
                {departments.map((dept) => (
                  <option key={dept.id} value={dept.name}>
                    {dept.name}
                  </option>
                ))}
              </select>
            </div>

            <button
              type="submit"
              className="w-full btn-primary"
              disabled={loading}
            >
              {loading ? '提交中...' : '完成并登录'}
            </button>
          </form>

          <div className="mt-6 text-center">
            <button
              onClick={() => router.push('/login')}
              className="text-sm text-gray-600 hover:text-gray-900"
            >
              返回登录
            </button>
          </div>
        </div>
      </div>
    </div>
  )
}

export default function CompleteProfilePage() {
  return (
    <Suspense fallback={
      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-primary-50 to-primary-100">
        <div className="text-center">
          <div className="inline-block animate-spin rounded-full h-12 w-12 border-4 border-primary-500 border-t-transparent"></div>
          <p className="mt-4 text-gray-600">加载中...</p>
        </div>
      </div>
    }>
      <CompleteProfileContent />
    </Suspense>
  )
}