'use client';

import { useState } from 'react';
import { Copy, ThumbsUp, ThumbsDown, RefreshCw, ChevronDown, ChevronUp, Brain, Loader2, AlertCircle, Check } from 'lucide-react';
import { Avatar } from '@/components/ui/Avatar';
import { AILogo } from '@/components/ui/AILogo';
import { MarkdownRenderer } from '@/components/markdown/MarkdownRenderer';
import { CodeExecutionResult, PyodideLoading } from '@/components/features/CodeExecutionResult';
import { cn } from '@/lib/utils';
import type { Message, User, ToolResult } from '@/types';

interface MessageBubbleProps {
  message: Message;
  user?: User;
  thinkingContent?: string;
  isStreaming?: boolean;
  error?: string;
  /** 代码执行产生的图片（Base64） */
  images?: string[];
  /** Pyodide 加载状态 */
  pyodideStatus?: {
    stage: 'loading' | 'ready' | 'error';
    message: string;
    progress?: number;
  };
}

export function MessageBubble({ message, user, thinkingContent, isStreaming, error, images, pyodideStatus }: MessageBubbleProps) {
  const isUser = message.role === 'user';
  const [thinkingExpanded, setThinkingExpanded] = useState(false);
  const [copied, setCopied] = useState(false);

  // 复制消息内容
  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(message.content);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch (error) {
      console.error('Failed to copy:', error);
    }
  };

  if (isUser) {
    return (
      <div className="flex justify-end items-start gap-3 mb-8 animate-fade-in">
        <div className="max-w-[70%]">
          <div className="bg-[var(--color-message-user)] text-[var(--color-text-primary)] px-4 py-3 rounded-[18px] text-base leading-relaxed">
            {message.content}
          </div>
        </div>
        {user && <Avatar name={user.name} size="md" />}
      </div>
    );
  }

  return (
    <div className="flex items-start gap-4 mb-8 animate-fade-in">
      {/* AI 图标 */}
      <div className="flex-shrink-0 mt-4">
        <AILogo size={28} />
      </div>

      {/* 消息内容 */}
      <div className="flex-1 max-w-full">
        {/* 思考内容 */}
        {thinkingContent && (
          <div className="mb-3">
            <button
              onClick={() => setThinkingExpanded(!thinkingExpanded)}
              className="inline-flex items-center gap-2 px-3 py-2 bg-purple-50 text-purple-700 rounded-lg text-sm hover:bg-purple-100 transition-colors"
            >
              <Brain size={16} />
              <span>思考过程</span>
              {thinkingExpanded ? <ChevronUp size={14} /> : <ChevronDown size={14} />}
            </button>
            {thinkingExpanded && (
              <div className="mt-2 p-4 bg-purple-50 border border-purple-200 rounded-lg">
                <pre className="text-sm text-purple-800 whitespace-pre-wrap font-mono">
                  {thinkingContent}
                </pre>
              </div>
            )}
          </div>
        )}

        {/* 错误提示 */}
        {error && (
          <div className="mb-3 p-4 bg-red-50 border border-red-200 rounded-lg flex items-start gap-3">
            <AlertCircle size={20} className="text-red-500 flex-shrink-0 mt-0.5" />
            <div className="text-sm text-red-700">{error}</div>
          </div>
        )}

        {/* 主要内容 */}
        <div className="bg-[var(--color-message-assistant-bg)] border border-[var(--color-message-assistant-border)] rounded-2xl px-5 py-4 shadow-sm">
          <div className="text-sm text-[var(--color-text-primary)] leading-[1.75]">
            {message.content ? (
              <MarkdownRenderer content={message.content} />
            ) : isStreaming ? (
              <div className="flex items-center gap-2 text-[var(--color-text-tertiary)]">
                <Loader2 size={16} className="animate-spin" />
                <span>正在思考...</span>
              </div>
            ) : null}
          </div>

          {/* 工具调用结果 - 代码执行图片展示 */}
          {message.toolResults && message.toolResults.length > 0 && (
            <div className="mt-4">
              {message.toolResults.map((result, index) => (
                <ToolResultDisplay key={index} result={result} />
              ))}
            </div>
          )}

          {/* Pyodide 加载状态 */}
          {pyodideStatus && (
            <div className="mt-4">
              <PyodideLoading
                stage={pyodideStatus.stage}
                message={pyodideStatus.message}
                progress={pyodideStatus.progress}
              />
            </div>
          )}

          {/* 代码执行图片（从 props 传入） */}
          {images && images.length > 0 && (
            <CodeExecutionResult
              images={images}
              success={true}
            />
          )}

          {/* 流式状态指示器 */}
          {isStreaming && message.content && (
            <div className="flex items-center gap-2 mt-3 text-sm text-[var(--color-text-tertiary)]">
              <Loader2 size={14} className="animate-spin" />
              <span>生成中...</span>
            </div>
          )}

          {/* 操作按钮（非流式状态下显示） */}
          {!isStreaming && message.content && (
            <>
              <div className="flex items-center gap-1 mt-4 pt-3">
                <button
                  onClick={handleCopy}
                  className="w-8 h-8 flex items-center justify-center rounded-lg text-[var(--color-text-tertiary)] hover:bg-[var(--color-bg-hover)] hover:text-[var(--color-text-secondary)] transition-colors"
                  title={copied ? '已复制' : '复制'}
                >
                  {copied ? <Check size={16} className="text-green-500" /> : <Copy size={16} />}
                </button>
                <ActionButton icon={ThumbsUp} title="好的回答" />
                <ActionButton icon={ThumbsDown} title="不好的回答" />
                <ActionButton icon={RefreshCw} title="重新生成" />
              </div>

              {/* 免责声明 */}
              <div className="text-xs text-[var(--color-text-tertiary)] text-right mt-2">
                LionCode can make mistakes
              </div>
            </>
          )}
        </div>
      </div>
    </div>
  );
}

interface ActionButtonProps {
  icon: React.ComponentType<{ size?: number }>;
  title: string;
  onClick?: () => void;
}

function ActionButton({ icon: Icon, title, onClick }: ActionButtonProps) {
  return (
    <button
      onClick={onClick}
      className="w-8 h-8 flex items-center justify-center rounded-lg text-[var(--color-text-tertiary)] hover:bg-[var(--color-bg-hover)] hover:text-[var(--color-text-secondary)] transition-colors"
      title={title}
    >
      <Icon size={16} />
    </button>
  );
}

/**
 * 工具调用结果显示组件
 * 专门处理代码执行结果和图片显示
 */
interface ToolResultDisplayProps {
  result: ToolResult;
}

function ToolResultDisplay({ result }: ToolResultDisplayProps) {
  // 只有代码执行工具才显示图片
  if (result.toolName !== 'code_execution') {
    return null;
  }

  // 如果没有图片，不显示
  if (!result.images || result.images.length === 0) {
    return null;
  }

  return (
    <CodeExecutionResult
      images={result.images}
      engine={result.engine}
      executionTime={result.executionTime}
      success={!result.isError}
    />
  );
}