import React, { useState, useRef, useEffect } from 'react';
import { Tabs, TabsContent, TabsList, TabsTrigger } from './ui/tabs';
import { UserGuide } from './UserGuide';
import { SmartReview } from './SmartReview';
import { Label } from './ui/label';
import { Button } from './ui/button';
import { LogIn, Edit, BookOpen } from 'lucide-react';
import { GroupMembers } from './GroupMembers';
import { Card } from './ui/card';
import { Input } from './ui/input';
import type { LearningMode, Language, SpaceType, GroupMember, User as UserType } from '../App';
import { toast } from 'sonner';

interface LeftSidebarProps {
  learningMode: LearningMode;
  language: Language;
  onLearningModeChange: (mode: LearningMode) => void;
  onLanguageChange: (lang: Language) => void;
  spaceType: SpaceType;
  groupMembers: GroupMember[];
  user: UserType | null;
  onLogin: (user: UserType) => void;
  onLogout: () => void;
  isLoggedIn: boolean;
  onEditProfile: () => void;
}

export function LeftSidebar({
  learningMode,
  language,
  onLearningModeChange,
  onLanguageChange,
  spaceType,
  groupMembers,
  user,
  onLogin,
  onLogout,
  isLoggedIn,
  onEditProfile,
}: LeftSidebarProps) {
  const [showLoginForm, setShowLoginForm] = useState(false);
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');

  const handleLogin = () => {
    if (!name.trim() || !email.trim()) {
      toast.error('Please fill in all fields');
      return;
    }

    onLogin({ name: name.trim(), email: email.trim() });
    setShowLoginForm(false);
    setName('');
    setEmail('');
    toast.success(`Welcome, ${name}!`);
  };

  const handleLogout = () => {
    onLogout();
    setShowLoginForm(false);
    toast.success('Logged out successfully');
  };

  const scrollContainerRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const container = scrollContainerRef.current;
    if (!container) return;

    const handleWheel = (e: WheelEvent) => {
      e.stopPropagation();
      e.stopImmediatePropagation();

      const { scrollTop, scrollHeight, clientHeight } = container;
      const isScrollable = scrollHeight > clientHeight;
      const isAtTop = scrollTop === 0;
      const isAtBottom = scrollTop + clientHeight >= scrollHeight - 1;

      if (isScrollable && ((isAtTop && e.deltaY < 0) || (isAtBottom && e.deltaY > 0))) {
        e.preventDefault();
      }
    };

    container.addEventListener('wheel', handleWheel, { passive: false, capture: true });
    return () => {
      container.removeEventListener('wheel', handleWheel, { capture: true } as any);
    };
  }, []);

  return (
    <div
      ref={scrollContainerRef}
      className="flex-1 overflow-auto overscroll-contain flex flex-col"
      style={{ overscrollBehavior: 'contain' }}
    >
      {/* Profile/Login Section */}
      <div className="p-4 border-b border-border flex-shrink-0">
        <h3 className="text-base font-medium mb-4">Profile</h3>
        <Card className="p-4">
          {!isLoggedIn ? (
            <div className="space-y-4">
              <div className="flex flex-col items-center py-4">
                <img
                  src="https://images.unsplash.com/photo-1588912914049-d2664f76a947?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3w3Nzg4Nzd8MHwxfHNlYXJjaHwxfHxzdHVkZW50JTIwc3R1ZHlpbmclMjBpbGx1c3RyYXRpb258ZW58MXx8fHwxNzY2MDY2NjcyfDA&ixlib=rb-4.1.0&q=80&w=1080&utm_source=figma&utm_medium=referral"
                  alt="Student studying"
                  className="w-20 h-20 rounded-full object-cover mb-4"
                />
                <h3 className="mb-2">Welcome to Clare!</h3>
                <p className="text-sm text-muted-foreground text-center mb-4">
                  Log in to start your personalized learning journey
                </p>
              </div>

              {!showLoginForm ? (
                <Button onClick={() => setShowLoginForm(true)} className="w-full gap-2">
                  <LogIn className="h-4 w-4" />
                  Student Login
                </Button>
              ) : (
                <div className="space-y-3">
                  <div className="space-y-2">
                    <Label htmlFor="name">Name</Label>
                    <Input
                      id="name"
                      value={name}
                      onChange={(e) => setName(e.target.value)}
                      placeholder="Enter your name"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="email">Email / Student ID</Label>
                    <Input
                      id="email"
                      type="email"
                      value={email}
                      onChange={(e) => setEmail(e.target.value)}
                      placeholder="Enter your email or ID"
                    />
                  </div>
                  <div className="flex gap-2">
                    <Button onClick={handleLogin} className="flex-1">
                      Enter
                    </Button>
                    <Button variant="outline" onClick={() => setShowLoginForm(false)}>
                      Cancel
                    </Button>
                  </div>
                </div>
              )}
            </div>
          ) : (
            <div className="space-y-3">
              <div className="flex items-start justify-between">
                <div className="flex items-center gap-2">
                  <img
                    src={`https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(
                      user?.email || ''
                    )}`}
                    alt={user?.name || 'User'}
                    className="w-8 h-8 rounded-full object-cover flex-shrink-0 bg-muted"
                  />
                  <div className="space-y-1">
                    <p className="text-sm text-muted-foreground">Hello,</p>
                    <h4>{user?.name ?? ''}!</h4>
                  </div>
                </div>
                <Button variant="ghost" size="icon" className="h-8 w-8" onClick={onEditProfile}>
                  <Edit className="h-4 w-4" />
                </Button>
              </div>
              <div className="text-xs text-muted-foreground">
                ID: {user?.email ? user.email.split('@')[0] : ''}
              </div>

              <Button variant="outline" className="w-full" onClick={handleLogout}>
                Log out
              </Button>
            </div>
          )}
        </Card>
      </div>

      {/* Group Members - Only show in group mode */}
      {spaceType === 'group' && (
        <div className="p-4 border-b border-border flex-shrink-0">
          <GroupMembers members={groupMembers} />
        </div>
      )}

      {/* Tabs */}
      <Tabs defaultValue="review" className="flex flex-col flex-1 min-h-0 overflow-hidden">
        <div className="px-4 pt-4">
          {/* 关键：TabsList 已在 ui/tabs.tsx 改成 w-full flex，这里只需要三等分 */}
          <TabsList className="w-full">
            <TabsTrigger value="review" className="flex-1 px-2 text-xs whitespace-nowrap">
              Smart Review
            </TabsTrigger>
            <TabsTrigger value="quiz" className="flex-1 px-2 text-xs whitespace-nowrap">
              Personal Quiz
            </TabsTrigger>
            <TabsTrigger value="guide" className="flex-1 px-2 text-xs whitespace-nowrap">
              User Guide
            </TabsTrigger>
          </TabsList>
        </div>

        <TabsContent value="review" className="flex-1 mt-0 p-4 space-y-6 overflow-auto">
          <SmartReview />
        </TabsContent>

        <TabsContent value="quiz" className="flex-1 mt-0 p-4 overflow-auto">
          <div className="space-y-4">
            <div className="flex items-center gap-2">
              <BookOpen className="h-5 w-5 text-red-500" />
              <h3 className="text-base font-medium">Personal Quiz</h3>
            </div>

            <Card className="p-3 bg-muted/50 border-border">
              <p className="text-xs text-muted-foreground leading-relaxed">
                Clare analyzes your chat history and learning patterns to randomly select a personalized question that
                challenges your understanding of previously discussed topics.
              </p>
            </Card>

            <Button
              className="w-full bg-red-500 hover:bg-red-600 text-white"
              size="sm"
              onClick={() => {
                toast.success('Generating personalized quiz...');
              }}
            >
              Test your memory
            </Button>
          </div>
        </TabsContent>

        <TabsContent value="guide" className="flex-1 mt-0 p-4 overflow-auto">
          <UserGuide />
        </TabsContent>
      </Tabs>
    </div>
  );
}