import React, { useState } from 'react'
import { 
  Home, 
  Settings, 
  BarChart3, 
  PieChart, 
  TrendingUp, 
  Activity, 
  BookOpen, 
  Users, 
  Upload, 
  Image,
  Video,
  ChevronDown,
  User
} from 'lucide-react'
import './App.css'

function App() {
  const [activeTab, setActiveTab] = useState('image')
  const [expandedMenu, setExpandedMenu] = useState('dashboard')
  const [activePage, setActivePage] = useState('dashboard') // 新增：当前激活的页面
  const [isDragOver, setIsDragOver] = useState(false)
  const [isUploading, setIsUploading] = useState(false)
  const [uploadedFiles, setUploadedFiles] = useState([])
  const [uploadProgress, setUploadProgress] = useState(0)

  const validateFiles = (files) => {
    const validImageTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/webp']
    const validVideoTypes = ['video/mp4', 'video/mov', 'video/avi']
    
    const validTypes = activeTab === 'video' ? validVideoTypes : validImageTypes
    const maxSize = activeTab === 'video' ? 2 * 1024 * 1024 * 1024 : 32 * 1024 * 1024 // 2GB for video, 32MB for images
    
    const invalidFiles = files.filter(file => {
      return !validTypes.includes(file.type) || file.size > maxSize
    })
    
    if (invalidFiles.length > 0) {
      alert(`发现 ${invalidFiles.length} 个无效文件，请检查文件格式和大小`)
      return false
    }
    
    return true
  }

  const simulateUpload = (files) => {
    setIsUploading(true)
    setUploadProgress(0)
    setUploadedFiles(files)
    
    // 模拟上传进度
    const interval = setInterval(() => {
      setUploadProgress(prev => {
        if (prev >= 100) {
          clearInterval(interval)
          setIsUploading(false)
          alert(`成功上传了 ${files.length} 个文件`)
          return 100
        }
        return prev + 10
      })
    }, 200)
  }

  const handleFileUpload = () => {
    if (isUploading) return
    
    const input = document.createElement('input')
    input.type = 'file'
    input.accept = activeTab === 'video' ? 'video/*' : 'image/*'
    input.multiple = activeTab === 'image'
    input.onchange = (e) => {
      const files = Array.from(e.target.files)
      if (files.length > 0 && validateFiles(files)) {
        simulateUpload(files)
      }
    }
    input.click()
  }

  const handleDragOver = (e) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragOver(true)
  }

  const handleDragLeave = (e) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragOver(false)
  }

  const handleDrop = (e) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragOver(false)
    
    if (isUploading) return
    
    const files = Array.from(e.dataTransfer.files)
    if (files.length > 0 && validateFiles(files)) {
      simulateUpload(files)
    }
  }

  const clearUploadedFiles = () => {
    setUploadedFiles([])
  }

  const removeFile = (indexToRemove) => {
    setUploadedFiles(prev => prev.filter((_, index) => index !== indexToRemove))
  }

  const menuItems = [
    { id: 'home', label: '首页', icon: Home },
    { id: 'notebooks', label: '笔记管理', icon: BookOpen },
    {
      id: 'dashboard',
      label: '数据看板',
      icon: BarChart3,
      submenu: [
        { id: 'overview', label: '账号概况' },
        { id: 'content', label: '内容分析' },
        { id: 'fans', label: '粉丝数据' }
      ]
    },
    { id: 'activity', label: '活动中心', icon: Activity },
    { id: 'notes', label: '笔记灵感', icon: BookOpen },
    { id: 'creator', label: '创作学院', icon: Users },
    { id: 'journal', label: '创作日刊', icon: BookOpen }
  ]
  const toggleMenu = (menuId) => {
    setExpandedMenu(expandedMenu === menuId ? null : menuId)
  }

  // 新增：处理页面切换的函数
  const handlePageChange = (pageId) => {
    setActivePage(pageId)
    // 如果点击的是有子菜单的项目，也要展开子菜单
    const menuItem = menuItems.find(item => item.id === pageId)
    if (menuItem && menuItem.submenu) {
      setExpandedMenu(pageId)
    }
  }

  return (
    <div className="app">
      {/* Header */}
      <header className="header">
        <div className="header-left">
          <div className="logo">小红书</div>
          <h1 className="header-title">创作服务平台</h1>
        </div>
        <div className="header-right">
          <div className="user-info">
            <User size={16} />
            <span>小红薯63081EA1</span>
          </div>
        </div>
      </header>

      {/* Sidebar */}
      <aside className="sidebar">
        <button className="publish-btn">发布笔记</button>
          <nav className="nav-menu">
          {menuItems.map((item) => (
            <div key={item.id} className="nav-item">
              <a
                href="#"
                className={`nav-link ${activePage === item.id ? 'active' : ''}`}
                onClick={(e) => {
                  e.preventDefault()
                  if (item.submenu) {
                    toggleMenu(item.id)
                  } else {
                    handlePageChange(item.id)
                  }
                }}
              >
                <item.icon size={16} />
                <span>{item.label}</span>
                {item.submenu && <ChevronDown size={16} style={{ marginLeft: 'auto', transform: expandedMenu === item.id ? 'rotate(180deg)' : 'rotate(0deg)', transition: 'transform 0.3s ease' }} />}
              </a>
              
              {item.submenu && expandedMenu === item.id && (
                <div className="nav-submenu">
                  {item.submenu.map((subItem) => (
                    <a 
                      key={subItem.id} 
                      href="#" 
                      className={`nav-link ${activePage === subItem.id ? 'active' : ''}`}
                      onClick={(e) => {
                        e.preventDefault()
                        handlePageChange(subItem.id)
                      }}
                    >
                      {subItem.label}
                    </a>
                  ))}
                </div>
              )}
            </div>
          ))}
        </nav>
      </aside>      {/* Main Content */}
      <main className="main-content">
        <div className="content-wrapper">
          {activePage === 'dashboard' || activePage === 'overview' || activePage === 'content' || activePage === 'fans' ? (
            // 上传页面内容（数据看板相关页面显示上传功能）
            <>
              {/* Upload Tabs */}
              <div className="upload-tabs">
                <button
                  className={`upload-tab ${activeTab === 'video' ? 'active' : ''}`}
                  onClick={() => setActiveTab('video')}
                >
                  上传视频
                </button>
                <button
                  className={`upload-tab ${activeTab === 'image' ? 'active' : ''}`}
                  onClick={() => setActiveTab('image')}
                >
                  上传图文
                </button>
              </div>

              {/* Upload Area */}
              <div 
                className={`upload-area ${isDragOver ? 'drag-over' : ''}`}
                onDragOver={handleDragOver}
                onDragLeave={handleDragLeave}
                onDrop={handleDrop}
              >
                <div className="upload-icon">
                  {activeTab === 'video' ? <Video /> : <Image />}
                </div>
                <h2 className="upload-title">
                  {activeTab === 'video' ? '拖拽视频到此处或点击上传' : '拖拽图片到此处或点击上传'}
                </h2>
                <p className="upload-subtitle">
                  {activeTab === 'video' ? '(需支持上传格式)' : '(需支持上传格式)'}
                </p>
                <button 
                  className={`upload-btn ${isUploading ? 'uploading' : ''}`} 
                  onClick={handleFileUpload}
                  disabled={isUploading}
                >
                  {isUploading ? `上传中... ${uploadProgress}%` : (activeTab === 'video' ? '上传视频' : '上传图片')}
                </button>
                
                {/* Upload Progress Bar */}
                {isUploading && (
                  <div className="progress-container">
                    <div className="progress-bar">
                      <div 
                        className="progress-fill" 
                        style={{ width: `${uploadProgress}%` }}
                      ></div>
                    </div>
                    <div className="progress-text">{uploadProgress}%</div>
                  </div>
                )}
              </div>

              {/* File Preview Area */}
              {uploadedFiles.length > 0 && (
                <div className="file-preview-area">
                  <div className="preview-header">
                    <h3 className="preview-title">已上传文件 ({uploadedFiles.length})</h3>
                    <button className="clear-files-btn" onClick={clearUploadedFiles}>
                      清除所有
                    </button>
                  </div>
                  <div className="file-grid">
                    {uploadedFiles.map((file, index) => (
                      <div key={index} className="file-item">
                        <button 
                          className="remove-file-btn"
                          onClick={() => removeFile(index)}
                          title="删除文件"
                        >
                          ×
                        </button>
                        {file.type?.startsWith('image/') ? (
                          <div className="file-thumbnail">
                            <img src={URL.createObjectURL(file)} alt={file.name} />
                          </div>
                        ) : (
                          <div className="file-thumbnail video-thumbnail">
                            <Video size={24} />
                          </div>
                        )}
                        <div className="file-info">
                          <div className="file-name" title={file.name}>
                            {file.name.length > 20 ? file.name.substring(0, 17) + '...' : file.name}
                          </div>
                          <div className="file-size">
                            {(file.size / 1024 / 1024).toFixed(2)} MB
                          </div>
                        </div>
                      </div>
                    ))}
                  </div>
                </div>
              )}

              {/* Upload Info */}
              <div className="upload-info fade-in" key={activeTab}>
                {activeTab === 'image' ? (
                  <>
                    <div className="info-item">
                      <h3 className="info-title">图片大小</h3>
                      <p className="info-desc">
                        支持上传的图片大小，<br />
                        最大32MB的图片文件
                      </p>
                    </div>
                    <div className="info-item">
                      <h3 className="info-title">图片格式</h3>
                      <p className="info-desc">
                        支持上传的图片格式：<br />
                        推荐使用png、jpg、jpeg、webp，不支持gif、live及其他转化的动图
                      </p>
                    </div>
                    <div className="info-item">
                      <h3 className="info-title">图片分辨率</h3>
                      <p className="info-desc">
                        不要竖图片尺寸，推荐上传3:4尺寸之间，分辨率不低于720*960的图片，<br />
                        超过17张的时候图片将自动压缩至相配尺寸
                      </p>
                    </div>
                  </>
                ) : (
                  <>
                    <div className="info-item">
                      <h3 className="info-title">视频大小</h3>
                      <p className="info-desc">
                        支持种类5分钟内视频，<br />
                        最大2GB的视频文件
                      </p>
                    </div>
                    <div className="info-item">
                      <h3 className="info-title">视频格式</h3>
                      <p className="info-desc">
                        支持常用视频格式：<br />
                        推荐使用mp4、mov
                      </p>
                    </div>
                    <div className="info-item">
                      <h3 className="info-title">视频分辨率</h3>
                      <p className="info-desc">
                        推荐上传720P (1280*720) 及以上视频，<br />
                        超过1080P的视频可能可能导致上传稍慢且消耗流量
                      </p>
                    </div>
                  </>
                )}
              </div>
            </>
          ) : (
            // 其他页面的内容
            <div className="page-content">
              <div className="page-header">
                <h1 className="page-title">
                  {activePage === 'home' && '首页'}
                  {activePage === 'notebooks' && '笔记管理'}
                  {activePage === 'activity' && '活动中心'}
                  {activePage === 'notes' && '笔记灵感'}
                  {activePage === 'creator' && '创作学院'}
                  {activePage === 'journal' && '创作日刊'}
                </h1>
              </div>
              <div className="page-body">
                <div className="placeholder-content">
                  <div className="placeholder-icon">
                    {activePage === 'home' && <Home size={48} />}
                    {activePage === 'notebooks' && <BookOpen size={48} />}
                    {activePage === 'activity' && <Activity size={48} />}
                    {activePage === 'notes' && <BookOpen size={48} />}
                    {activePage === 'creator' && <Users size={48} />}
                    {activePage === 'journal' && <BookOpen size={48} />}
                  </div>
                  <h3 className="placeholder-title">
                    {activePage === 'home' && '欢迎来到小红书创作平台'}
                    {activePage === 'notebooks' && '笔记管理功能开发中'}
                    {activePage === 'activity' && '活动中心功能开发中'}
                    {activePage === 'notes' && '笔记灵感功能开发中'}
                    {activePage === 'creator' && '创作学院功能开发中'}
                    {activePage === 'journal' && '创作日刊功能开发中'}
                  </h3>
                  <p className="placeholder-desc">
                    {activePage === 'home' && '在这里您可以管理您的创作内容，查看数据分析，获取创作灵感。'}
                    {activePage === 'notebooks' && '这里将显示您的所有笔记，支持编辑、删除、分类等操作。'}
                    {activePage === 'activity' && '这里将展示最新的平台活动，让您参与更多有趣的创作活动。'}
                    {activePage === 'notes' && '这里将为您提供创作灵感和写作建议，帮助您创作更好的内容。'}
                    {activePage === 'creator' && '这里将提供创作技巧教学和平台规则说明，助您成为优秀创作者。'}
                    {activePage === 'journal' && '这里将展示创作相关的最新资讯和平台动态。'}
                  </p>
                </div>
              </div>
            </div>
          )}
        </div>
      </main>
    </div>
  )
}

export default App