"use client"

import { SiteHeader } from "@/components/site-header"
import { useFamily } from "@/context/family-context"
import { Button } from "@/components/ui/button"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Download, Upload, AlertTriangle, RefreshCw, FileText, Bell, History, Database, User as UserIcon } from "lucide-react"
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
import { useRef, useState, useEffect } from "react"
import { exportToGedcom, importFromGedcom } from "@/lib/gedcom"
import { NotificationSettings } from "@/components/settings/notification-settings"
import { ActivityLogViewer } from "@/components/settings/activity-log-viewer"
import { upgradeDatabase } from "@/lib/db-upgrade"
import { ErrorBoundary } from "@/components/error-boundary"
import { useSession } from "next-auth/react"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { ChangePassword } from "@/components/settings/change-password"

interface UserProfile {
  id: string
  email: string
  name: string | null
  createdAt: string
  updatedAt: string
  ownedTreesCount: number
  collaborations: Array<{
    treeId: string
    treeName: string
    role: string
  }>
}

export default function SettingsPage() {
  const { treeData, loadData, resetData } = useFamily()
  const { data: session } = useSession()
  const [importStatus, setImportStatus] = useState<string>("")
  const [gedcomStatus, setGedcomStatus] = useState<string>("")
  const [userProfile, setUserProfile] = useState<UserProfile | null>(null)
  const fileInputRef = useRef<HTMLInputElement>(null)
  const gedcomInputRef = useRef<HTMLInputElement>(null)
  
  const getUserInitial = () => {
    if (session?.user?.name) {
      return session.user.name.charAt(0).toUpperCase()
    }
    if (session?.user?.email) {
      return session.user.email.charAt(0).toUpperCase()
    }
    return "U"
  }

  // 获取用户资料
  useEffect(() => {
    if (session?.user?.id) {
      fetch('/api/user/profile')
        .then(res => res.json())
        .then(data => {
          if (data.user) {
            setUserProfile(data.user)
          }
        })
        .catch(err => console.error('获取用户资料失败:', err))
    }
  }, [session?.user?.id])

  const getRoleText = (role: string) => {
    const roleMap: Record<string, string> = {
      'OWNER': '所有者',
      'EDITOR': '编辑者',
      'VIEWER': '查看者'
    }
    return roleMap[role] || role
  }

  const getRoleBadgeColor = (role: string) => {
    const colorMap: Record<string, string> = {
      'OWNER': 'bg-purple-100 text-purple-700 border-purple-200',
      'EDITOR': 'bg-blue-100 text-blue-700 border-blue-200',
      'VIEWER': 'bg-gray-100 text-gray-700 border-gray-200'
    }
    return colorMap[role] || 'bg-gray-100 text-gray-700'
  }

  return (
    <div className="min-h-screen bg-background flex flex-col font-sans">
      <SiteHeader />
      <main className="container mx-auto py-8 px-4 md:px-6 flex-1 max-w-6xl">
        <h1 className="text-3xl font-serif font-bold mb-8">系统设置 (Settings)</h1>

        <div className="space-y-6">
          {/* 用户信息和密码修改 - 两列布局 */}
          {session && (
            <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
              <Card>
                <CardHeader>
                  <CardTitle className="flex items-center gap-2">
                    <UserIcon className="h-5 w-5" /> 用户信息
                  </CardTitle>
                  <CardDescription>您的账号信息和角色</CardDescription>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="flex items-center gap-4">
                    <Avatar className="h-16 w-16 border-2 border-border">
                      <AvatarFallback className="text-2xl">{getUserInitial()}</AvatarFallback>
                    </Avatar>
                    <div className="flex-1">
                      <h3 className="text-lg font-semibold">{session.user?.name || "用户"}</h3>
                      <p className="text-sm text-muted-foreground">{session.user?.email}</p>
                      <p className="text-xs text-muted-foreground mt-1">
                        用户 ID: {session.user?.id}
                      </p>
                    </div>
                  </div>

                  {userProfile && (userProfile.ownedTreesCount > 0 || userProfile.collaborations.length > 0) && (
                    <div className="space-y-3 pt-3 border-t">
                      <p className="text-sm font-medium">我的家族树</p>
                      <div className="space-y-2">
                        {/* 显示拥有的家族树（所有者） */}
                        {userProfile.ownedTreesCount > 0 && (
                          <div className="text-sm text-muted-foreground">
                            <span className={`inline-flex items-center px-2 py-1 rounded-full border text-xs ${getRoleBadgeColor('OWNER')}`}>
                              {getRoleText('OWNER')}
                            </span>
                            <span className="ml-2">{userProfile.ownedTreesCount} 个家族树</span>
                          </div>
                        )}
                        
                        {/* 显示协作的家族树 */}
                        {userProfile.collaborations.length > 0 && (
                          <div className="space-y-2">
                            {userProfile.collaborations.map((collab) => (
                              <div key={collab.treeId} className="flex items-center justify-between text-sm p-2 rounded-md bg-muted/50">
                                <span className="text-muted-foreground truncate flex-1">{collab.treeName}</span>
                                <span className={`text-xs px-2 py-1 rounded-full border ${getRoleBadgeColor(collab.role)}`}>
                                  {getRoleText(collab.role)}
                                </span>
                              </div>
                            ))}
                          </div>
                        )}
                      </div>
                    </div>
                  )}
                </CardContent>
              </Card>
              
              <ChangePassword />
            </div>
          )}
          
          {/* 通知设置和数据备份 - 两列布局 */}
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
            <NotificationSettings />
            
            <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Download className="h-5 w-5" /> 数据备份 (Backup)
              </CardTitle>
              <CardDescription>将家族数据导出为 JSON 文件进行本地保存。</CardDescription>
            </CardHeader>
            <CardContent>
              <Button
                onClick={() => {
                  const dataStr = JSON.stringify(treeData, null, 2)
                  const blob = new Blob([dataStr], { type: "application/json" })
                  const url = URL.createObjectURL(blob)
                  const link = document.createElement("a")
                  link.href = url
                  link.download = `family_tree_backup_${new Date().toISOString().split("T")[0]}.json`
                  document.body.appendChild(link)
                  link.click()
                  document.body.removeChild(link)
                }}
              >
                导出数据 (Export JSON)
              </Button>
            </CardContent>
          </Card>
          </div>

          {/* 数据恢复和 GEDCOM - 两列布局 */}
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <Upload className="h-5 w-5" /> 数据恢复 (Restore)
                </CardTitle>
                <CardDescription>从 JSON 备份文件恢复数据。注意：这将覆盖当前的所有数据。</CardDescription>
              </CardHeader>
              <CardContent className="space-y-4">
                <Alert variant="destructive">
                  <AlertTriangle className="h-4 w-4" />
                  <AlertTitle>警告</AlertTitle>
                  <AlertDescription>导入操作不可撤销。建议在导入前先导出当前数据备份。</AlertDescription>
                </Alert>

                <div className="flex items-center gap-4">
                  <input
                    type="file"
                    ref={fileInputRef}
                    className="hidden"
                    accept=".json"
                    onChange={(e) => {
                      const file = e.target.files?.[0]
                      if (!file) return

                      const reader = new FileReader()
                      reader.onload = async (event) => {
                        try {
                          const jsonStr = event.target?.result as string
                          const data = JSON.parse(jsonStr)
                          await loadData(data)
                          setImportStatus("导入成功！")
                          if (fileInputRef.current) fileInputRef.current.value = ""
                        } catch (err) {
                          console.error(err)
                          setImportStatus("错误：无法解析 JSON 文件")
                        }
                      }
                      reader.readAsText(file)
                    }}
                  />
                  <Button variant="outline" onClick={() => fileInputRef.current?.click()}>
                    选择文件...
                  </Button>
                  <span className="text-sm text-muted-foreground">{importStatus}</span>
                </div>
              </CardContent>
            </Card>

            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <FileText className="h-5 w-5" /> GEDCOM 格式
                </CardTitle>
                <CardDescription>导入/导出标准 GEDCOM 格式，兼容其他家谱软件（如 Ancestry、MyHeritage）。</CardDescription>
              </CardHeader>
            <CardContent className="space-y-4">
              <div className="flex items-center gap-4">
                <Button
                  variant="outline"
                  onClick={() => {
                    const gedcomText = exportToGedcom(treeData)
                    const blob = new Blob([gedcomText], { type: "text/plain;charset=utf-8" })
                    const url = URL.createObjectURL(blob)
                    const link = document.createElement("a")
                    link.href = url
                    link.download = `family_tree_${new Date().toISOString().split("T")[0]}.ged`
                    document.body.appendChild(link)
                    link.click()
                    document.body.removeChild(link)
                  }}
                >
                  <Download className="mr-2 h-4 w-4" />
                  导出 GEDCOM
                </Button>
                
                <input
                  type="file"
                  ref={gedcomInputRef}
                  className="hidden"
                  accept=".ged,.gedcom"
                  onChange={(e) => {
                    const file = e.target.files?.[0]
                    if (!file) return

                    const reader = new FileReader()
                    reader.onload = async (event) => {
                      try {
                        const gedcomText = event.target?.result as string
                        const importedData = importFromGedcom(gedcomText)
                        await loadData(importedData)
                        setGedcomStatus("GEDCOM 导入成功！")
                        if (gedcomInputRef.current) gedcomInputRef.current.value = ""
                      } catch (err) {
                        console.error(err)
                        setGedcomStatus("错误：无法解析 GEDCOM 文件")
                      }
                    }
                    reader.readAsText(file)
                  }}
                />
                <Button variant="outline" onClick={() => gedcomInputRef.current?.click()}>
                  <Upload className="mr-2 h-4 w-4" />
                  导入 GEDCOM
                </Button>
                {gedcomStatus && <span className="text-sm text-muted-foreground">{gedcomStatus}</span>}
              </div>
            </CardContent>
            </Card>
          </div>

          {/* 数据库和系统管理 - 两列布局 */}
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <Database className="h-5 w-5" /> 数据库维护
                </CardTitle>
              <CardDescription>升级数据库以支持新功能（如操作日志）</CardDescription>
            </CardHeader>
            <CardContent className="space-y-4">
              <Alert>
                <AlertDescription>
                  如果操作日志功能不工作，请点击下方按钮升级数据库。升级会保留所有现有数据。
                </AlertDescription>
              </Alert>
              <Button
                variant="outline"
                onClick={async () => {
                  if (confirm("确定要升级数据库吗？这会保留所有现有数据。")) {
                    try {
                      await upgradeDatabase()
                      alert("数据库升级成功！请刷新页面。")
                      window.location.reload()
                    } catch (error) {
                      alert("数据库升级失败：" + (error as Error).message)
                    }
                  }
                }}
              >
                <Database className="mr-2 h-4 w-4" />
                升级数据库
              </Button>
            </CardContent>
            </Card>

            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <AlertTriangle className="h-5 w-5 text-destructive" /> 危险区域 (Danger Zone)
                </CardTitle>
              <CardDescription>这些操作不可逆，请谨慎使用。</CardDescription>
            </CardHeader>
            <CardContent>
              <Button
                variant="destructive"
                onClick={async () => {
                  if (confirm("确定要重置吗？所有更改将丢失。")) {
                    await resetData()
                    alert("数据已重置为演示状态。")
                  }
                }}
              >
                重置所有数据
              </Button>
            </CardContent>
            </Card>
          </div>

          {/* 操作日志 - 全宽 */}
          <ErrorBoundary>
            <ActivityLogViewer />
          </ErrorBoundary>
        </div>
      </main>
    </div>
  )
}