import { useEffect, useState } from 'react';
import './GradingModal.css';
import type { MatchedAssistant } from '../types/index';

interface GradingModalProps {
  isOpen: boolean;
  assistant: MatchedAssistant | null;
  language: string;
}

const GradingModal = ({ isOpen, assistant, language }: GradingModalProps) => {
  const [progress, setProgress] = useState(0);
  const [currentStep, setCurrentStep] = useState(0);

  const steps = language === 'zh-TW' ? [
    '📖 讀取文章內容...',
    '🤖 啟動 AI 批改引擎...',
    '📝 分析文章結構...',
    '🔍 檢查文法與用詞...',
    '💡 生成改進建議...',
    '✨ 整理批改結果...',
  ] : [
    '📖 Reading your article...',
    '🤖 Starting AI grading engine...',
    '📝 Analyzing article structure...',
    '🔍 Checking grammar and wording...',
    '💡 Generating suggestions...',
    '✨ Finalizing results...',
  ];

  useEffect(() => {
    if (!isOpen) {
      setProgress(0);
      setCurrentStep(0);
      return;
    }

    // 每個步驟的目標進度
    const progressPerStep = 100 / steps.length;

    // 更新步驟（每 5 秒一個步驟）
    const stepInterval = setInterval(() => {
      setCurrentStep(prev => {
        if (prev >= steps.length - 1) return prev;
        return prev + 1;
      });
    }, 5000);

    // 進度條跟隨步驟緩慢增加
    const progressInterval = setInterval(() => {
      setProgress(prev => {
        const targetProgress = (currentStep + 1) * progressPerStep;
        // 如果還沒到當前步驟的目標進度，緩慢增加
        if (prev < targetProgress - 2) {
          return prev + 0.5 + Math.random() * 0.5; // 每次增加 0.5-1%
        }
        // 接近目標時停止
        return Math.min(prev, 95);
      });
    }, 100);

    return () => {
      clearInterval(progressInterval);
      clearInterval(stepInterval);
    };
  }, [isOpen, steps.length, currentStep]);

  if (!isOpen) return null;

  return (
    <div className="grading-modal-overlay">
      <div className="grading-modal">
        <div className="grading-modal-header">
          <h2>{language === 'zh-TW' ? 'AI 批改中' : 'AI Grading in Progress'}</h2>
        </div>

        <div className="grading-modal-body">
          {/* 機器人資訊 */}
          {assistant && (
            <div className="assistant-info">
              <div className="assistant-icon">🤖</div>
              <div className="assistant-details">
                <h3>{assistant.name}</h3>
                <p className="assistant-subtitle">
                  {language === 'zh-TW' ? '專業 AI 批改助手' : 'Professional AI Grading Assistant'}
                </p>
              </div>
            </div>
          )}

          {/* 進度條 */}
          <div className="progress-section">
            <div className="progress-bar-container">
              <div
                className="progress-bar-fill"
                style={{ width: `${Math.min(progress, 100)}%` }}
              />
            </div>
            <div className="progress-text">
              {Math.round(Math.min(progress, 100))}%
            </div>
          </div>

          {/* 當前步驟 */}
          <div className="steps-section">
            {steps.map((step, index) => (
              <div
                key={index}
                className={`step-item ${index === currentStep ? 'active' : ''} ${index < currentStep ? 'completed' : ''}`}
              >
                {index < currentStep ? '✓' : index === currentStep ? '⏳' : '○'} {step}
              </div>
            ))}
          </div>

          {/* 提示資訊 */}
          <div className="grading-info">
            <p className="info-text">
              {language === 'zh-TW'
                ? '⏱️ AI 批改通常需要 30-60 秒，請耐心等待...'
                : '⏱️ AI grading usually takes 30-60 seconds, please wait...'}
            </p>
            <p className="info-subtitle">
              {language === 'zh-TW'
                ? '💡 批改完成後會自動顯示詳細結果'
                : '💡 Results will be displayed automatically when complete'}
            </p>
          </div>
        </div>
      </div>
    </div>
  );
};

export default GradingModal;