/**
 * AgentHub - 智能体大厅主界面
 * 
 * 100%还原原型图V11：
 * - 最大宽度 760px，居中
 * - 头部搜索框
 * - 时间轴设计（左侧序号圆点+连接线）
 * - 5个阶段，12个智能体卡片
 */

import React, { useState, useMemo } from 'react';
import { BrainCircuit, Search } from 'lucide-react';
import { AgentCard } from './AgentCard';
import { AGENTS, PHASES } from '../constants';
import type { AgentConfig } from '../types';
import '../styles/agent-hub.css';

interface AgentHubProps {
  onAgentSelect: (agent: AgentConfig) => void;
}

export const AgentHub: React.FC<AgentHubProps> = ({ onAgentSelect }) => {
  const [searchValue, setSearchValue] = useState('');

  // 按阶段分组智能体
  const agentsByPhase = useMemo(() => {
    const grouped: Record<number, AgentConfig[]> = {};
    AGENTS.forEach(agent => {
      if (!grouped[agent.phase]) {
        grouped[agent.phase] = [];
      }
      grouped[agent.phase].push(agent);
    });
    return grouped;
  }, []);

  // 搜索提交
  const handleSearch = () => {
    if (searchValue.trim()) {
      // 默认进入第一个智能体并携带搜索内容
      const firstAgent = AGENTS[0];
      onAgentSelect({ ...firstAgent, initialQuery: searchValue } as any);
    }
  };

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      handleSearch();
    }
  };

  return (
    <div className="agent-hub">
      {/* 主体内容 */}
      <main className="hub-main">
        {/* 头部搜索区 */}
        <div className="hub-header">
          <div className="header-title">
            <div className="title-icon">
              <BrainCircuit size={24} />
            </div>
            <h1 className="title-text">
              医学研究专属大模型
              <span className="title-badge">已接入DeepSeek</span>
            </h1>
          </div>

          <div className="search-box">
            <input
              type="text"
              placeholder="输入研究想法，例如：SGLT2抑制剂对心衰患者预后的影响..."
              value={searchValue}
              onChange={(e) => setSearchValue(e.target.value)}
              onKeyDown={handleKeyDown}
              className="search-input"
            />
            <button className="search-btn" onClick={handleSearch}>
              <Search size={20} />
            </button>
          </div>
        </div>

        {/* 流水线模块 */}
        <div className="pipeline-container">
          {PHASES.map((phase, phaseIndex) => {
            const isLast = phaseIndex === PHASES.length - 1;
            const agents = agentsByPhase[phase.phase] || [];
            
            // 根据阶段确定列数
            let gridCols = 'grid-cols-3';
            if (phase.phase === 2) gridCols = 'grid-cols-3'; // 4个卡片，每行3个
            if (phase.phase === 3) gridCols = 'grid-cols-3'; // 1个卡片
            if (phase.phase === 4) gridCols = 'grid-cols-3'; // 2个卡片
            if (phase.phase === 5) gridCols = 'grid-cols-3'; // 2个卡片

            return (
              <div
                key={phase.phase}
                className={`pipeline-stage ${isLast ? 'last-stage' : ''}`}
              >
                {/* 左侧时间轴 */}
                <div className="timeline-marker">
                  <div className={`timeline-dot theme-${phase.theme}`}>
                    {phase.phase}
                  </div>
                  {!isLast && <div className="timeline-line" />}
                </div>

                {/* 阶段内容 */}
                <div className="stage-content">
                  <h2 className="stage-title">
                    {phase.name}
                    {phase.isTool && (
                      <span className="tool-badge">工具</span>
                    )}
                  </h2>

                  <div className={`agents-grid ${gridCols}`}>
                    {agents.map(agent => (
                      <AgentCard
                        key={agent.id}
                        agent={agent}
                        onClick={onAgentSelect}
                      />
                    ))}
                  </div>
                </div>
              </div>
            );
          })}
        </div>
      </main>

      {/* 底部 */}
      <footer className="hub-footer">
        <p>&copy; 2025 临床研究平台 - 医学研究专属大模型</p>
      </footer>
    </div>
  );
};

export default AgentHub;