import React from 'react';

const TopicSelector = ({ 
  onTopicsChange, 
  availableTopics = [], 
  selectedTopics = [],
  customTopics = [],
  onCustomTopicsChange,
  customSentence = '',
  onSentenceChange,
  multiTheme = true,
  onMultiThemeChange
}) => {
  const handleTopicToggle = (topic) => {
    const newSelectedTopics = selectedTopics.includes(topic)
      ? selectedTopics.filter(t => t !== topic)
      : [...selectedTopics, topic];
    
    onTopicsChange(newSelectedTopics);
  };

  const handleAddCustomTopic = () => {
    const newCustomTopics = [...customTopics, ''];
    onCustomTopicsChange && onCustomTopicsChange(newCustomTopics);
  };

  const handleCustomTopicChange = (index, value) => {
    // Limit to 3 words (max 2 spaces)
    const spaceCount = (value.match(/ /g) || []).length;
    if (spaceCount > 2) {
      return; // Don't update if more than 2 spaces
    }
    
    const newCustomTopics = [...customTopics];
    newCustomTopics[index] = value;
    onCustomTopicsChange && onCustomTopicsChange(newCustomTopics);
  };

  const handleRemoveCustomTopic = (index) => {
    const newCustomTopics = customTopics.filter((_, i) => i !== index);
    onCustomTopicsChange && onCustomTopicsChange(newCustomTopics);
  };

  return (
    <div className="topic-selector">
      <h3>Select Topics</h3>
      <div className="topic-buttons">
        {availableTopics.map(topic => (
          <button
            key={topic.id}
            className={`topic-btn ${selectedTopics.includes(topic.name) ? 'selected' : ''}`}
            onClick={() => handleTopicToggle(topic.name)}
          >
            {topic.name}
          </button>
        ))}
      </div>
      
      {/* Custom Topics Section */}
      <div className="custom-topics-container">
        <h3>Custom Topics</h3>
        <p className="custom-topics-description">Add your own topics (up to 3 words per box)</p>
        
        {customTopics.map((topic, index) => (
          <div key={index} className="custom-topic-input-container">
            <input
              type="text"
              value={topic}
              onChange={(e) => handleCustomTopicChange(index, e.target.value)}
              placeholder='Enter a custom topic... "climate change", "video game", "ice cream"'
              className="custom-topic-input"
              maxLength="30"
            />
            <button
              type="button"
              onClick={() => handleRemoveCustomTopic(index)}
              className="remove-topic-btn"
              title="Remove topic"
            >
              ✕
            </button>
          </div>
        ))}
        
        <button
          type="button"
          onClick={handleAddCustomTopic}
          className="add-topic-btn"
        >
          + Add Custom Topic
        </button>
      </div>
      
      <div className="sentence-input-container">
        <label htmlFor="custom-sentence" className="sentence-label">
          Custom Sentence (optional)
        </label>
        <textarea
          id="custom-sentence"
          className="sentence-input"
          value={customSentence}
          onChange={(e) => onSentenceChange && onSentenceChange(e.target.value)}
          placeholder='Enter a sentence to influence word selection... e.g., "india won the test series against england" or "Fresh ingredients make the perfect morning meal"'
          rows="3"
          maxLength="200"
        />
        <div className="sentence-info">
          <span className="char-count">{customSentence.length}/200 characters</span>
          {customSentence && (
            <button 
              type="button"
              className="clear-sentence-btn"
              onClick={() => onSentenceChange && onSentenceChange('')}
              title="Clear sentence"
            >
              Clear
            </button>
          )}
        </div>
      </div>
      
      <div className="multi-theme-toggle-container">
        <label className="multi-theme-toggle">
          <input
            type="checkbox"
            checked={multiTheme}
            onChange={(e) => onMultiThemeChange && onMultiThemeChange(e.target.checked)}
            className="multi-theme-checkbox"
          />
          <span className="multi-theme-label">
            🎯 Use Multi-Theme Processing
          </span>
        </label>
        <p className="multi-theme-description">
          {multiTheme 
            ? "AI will process each theme separately and balance results" 
            : "AI will blend all themes into a single concept"
          }
        </p>
      </div>
      
      <p className="selected-count">
        {selectedTopics.length + customTopics.filter(t => t.trim()).length} total topic{(selectedTopics.length + customTopics.filter(t => t.trim()).length) !== 1 ? 's' : ''} selected
      </p>
    </div>
  );
};

export default TopicSelector;