import { Send } from 'lucide-react';
import { MESSAGE_MAX_LENGTH } from '../../constants';

/**
 * Chat Input component with send button and character counter
 *
 * @param {string} value - Input value
 * @param {function} onChange - Change handler for input
 * @param {function} onSubmit - Submit handler for form
 * @param {boolean} disabled - Whether input is disabled (e.g., when not connected)
 * @param {string} placeholder - Placeholder text (default: "Write a message...")
 * @param {string} className - Additional classes for the form
 * @param {boolean} autoFocus - Whether to autofocus the input
 */
const ChatInput = ({
  value,
  onChange,
  onSubmit,
  disabled = false,
  placeholder = 'Write a message...',
  className = '',
  autoFocus = false
}) => {
  const handleSubmit = (e) => {
    e.preventDefault();
    if (!value.trim() || disabled) return;
    onSubmit(e);
  };

  const charCount = value.length;
  const isNearLimit = charCount > MESSAGE_MAX_LENGTH * 0.8; // 80% of limit
  const isOverLimit = charCount > MESSAGE_MAX_LENGTH;

  return (
    <div className="space-y-1">
      <form onSubmit={handleSubmit} className={`flex space-x-2 ${className}`}>
        <input
          type="text"
          value={value}
          onChange={onChange}
          placeholder={placeholder}
          disabled={disabled}
          autoFocus={autoFocus}
          maxLength={MESSAGE_MAX_LENGTH}
          className="flex-1 px-4 py-2 border border-gray-300 rounded-lg focus:ring-primary-500 focus:border-primary-500 disabled:opacity-50 disabled:cursor-not-allowed"
        />
        <button
          type="submit"
          disabled={disabled || !value.trim() || isOverLimit}
          className="px-4 py-2 bg-primary-600 text-white rounded-lg hover:bg-primary-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
          aria-label="Send message"
        >
          <Send className="w-5 h-5" />
        </button>
      </form>

      {/* Character counter - show when approaching limit */}
      {isNearLimit && (
        <div className="text-right">
          <span className={`text-xs ${isOverLimit ? 'text-red-600' : 'text-gray-500'}`}>
            {charCount}/{MESSAGE_MAX_LENGTH}
          </span>
        </div>
      )}
    </div>
  );
};

export default ChatInput;