/**
 * Processing mode selection component
 * Used to select fast or precise mode when uploading files
 */

import React, { useState, useEffect } from 'react';
import { uploadService } from '../services/uploadService';
import { ModeRecommendation } from '../types';

interface ModeSelectorProps {
  file: File | null;
  onModeChange: (mode: 'fast' | 'precise') => void;
  className?: string;
}

export const ModeSelector: React.FC<ModeSelectorProps> = ({
  file,
  onModeChange,
  className = '',
}) => {
  const [selectedMode, setSelectedMode] = useState<'fast' | 'precise'>('fast');
  const [recommendation, setRecommendation] = useState<ModeRecommendation | null>(null);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (file) {
      loadRecommendation();
    } else {
      setRecommendation(null);
    }
  }, [file]);

  const loadRecommendation = async () => {
    if (!file) return;

    setLoading(true);
    try {
      const rec = await uploadService.recommendMode(file);
      setRecommendation(rec);

      // Automatically select recommended mode
      setSelectedMode(rec.recommendedMode);
      onModeChange(rec.recommendedMode);
    } catch (error) {
      console.error('Failed to get mode recommendation:', error);
    } finally {
      setLoading(false);
    }
  };

  const handleModeChange = (mode: 'fast' | 'precise') => {
    setSelectedMode(mode);
    onModeChange(mode);
  };

  if (!file) {
    return null;
  }

  return (
    <div className={`mode-selector ${className}`}>
      <div className="mode-selector-header">
        <h4>Select processing mode</h4>
        {loading && <span className="loading">Analyzing...</span>}
      </div>

      {/* Mode recommendation info */}
      {recommendation && (
        <div className="recommendation-info">
          <div className="reason">
            <strong>Recommended:</strong> {recommendation.reason}
          </div>

          {recommendation.warnings && recommendation.warnings.length > 0 && (
            <div className="warnings">
              {recommendation.warnings.map((warning, idx) => (
                <div key={idx} className="warning-item">
                  ⚠️ {warning}
                </div>
              ))}
            </div>
          )}
        </div>
      )}

      {/* Mode selection */}
      <div className="mode-options">
        <label className={`mode-option ${selectedMode === 'fast' ? 'selected' : ''}`}>
          <input
            type="radio"
            name="processing-mode"
            value="fast"
            checked={selectedMode === 'fast'}
            onChange={() => handleModeChange('fast')}
          />
          <div className="mode-content">
            <div className="mode-title">⚡ Fast Mode</div>
            <div className="mode-desc">
              Simple text extraction, fast, ideal for plain text documents
            </div>
            <div className="mode-benefits">
              ✅ Fast<br />
              ✅ No additional cost<br />
              ❌ Processes text information only
            </div>
          </div>
        </label>

        <label className={`mode-option ${selectedMode === 'precise' ? 'selected' : ''}`}>
          <input
            type="radio"
            name="processing-mode"
            value="precise"
            checked={selectedMode === 'precise'}
            onChange={() => handleModeChange('precise')}
          />
          <div className="mode-content">
            <div className="mode-title">🎯 Precise Mode</div>
            <div className="mode-desc">
              Accurately recognizes content and retains full information
            </div>
            <div className="mode-benefits">
              ✅ Recognizes images/tables<br />
              ✅ Retains layout information<br />
              ✅ Mixed image and text content<br />
              ⚠️ API cost required<br />
              ⚠️ Long processing time
            </div>
          </div>
        </label>
      </div>

      <style jsx>{`
        .mode-selector {
          margin: 16px 0;
          padding: 16px;
          border: 1px solid #e0e0e0;
          border-radius: 8px;
          background: #fafafa;
        }

        .mode-selector-header {
          display: flex;
          justify-content: space-between;
          align-items: center;
          margin-bottom: 12px;
        }

        .mode-selector-header h4 {
          margin: 0;
          font-size: 16px;
          font-weight: 600;
        }

        .loading {
          color: #1890ff;
          font-size: 12px;
        }

        .recommendation-info {
          margin-bottom: 16px;
          padding: 12px;
          background: #e6f7ff;
          border: 1px solid #91d5ff;
          border-radius: 6px;
          font-size: 13px;
        }

        .recommendation-info .reason {
          margin-bottom: 8px;
          color: #0050b3;
        }

        .warnings {
          margin-top: 8px;
          padding-top: 8px;
          border-top: 1px dashed #91d5ff;
        }

        .warning-item {
          color: #d4380d;
          margin: 4px 0;
        }

        .mode-options {
          display: grid;
          grid-template-columns: 1fr 1fr;
          gap: 12px;
        }

        .mode-option {
          display: flex;
          gap: 8px;
          padding: 12px;
          border: 2px solid #d9d9d9;
          border-radius: 8px;
          cursor: pointer;
          transition: all 0.2s;
          background: white;
        }

        .mode-option:hover {
          border-color: #1890ff;
          background: #f0f7ff;
        }

        .mode-option.selected {
          border-color: #1890ff;
          background: #e6f7ff;
          box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
        }

        .mode-option input[type="radio"] {
          margin-top: 4px;
          cursor: pointer;
        }

        .mode-content {
          flex: 1;
        }

        .mode-title {
          font-weight: 600;
          font-size: 14px;
          margin-bottom: 4px;
        }

        .mode-desc {
          font-size: 12px;
          color: #666;
          margin-bottom: 8px;
          line-height: 1.4;
        }

        .mode-benefits {
          font-size: 11px;
          line-height: 1.6;
          color: #555;
        }

        @media (max-width: 768px) {
          .mode-options {
            grid-template-columns: 1fr;
          }
        }
      `}</style>
    </div>
  );
};