/**
 * MessageInput Component
 * Input field for sending messages
 */

import React, { useState, useRef } from 'react';
import './MessageInput.css';

export default function MessageInput({ onSend, onTyping, onStopTyping }) {
  const [message, setMessage] = useState('');
  const [uploading, setUploading] = useState(false);
  const fileInputRef = useRef(null);
  const typingTimeoutRef = useRef(null);

  const handleChange = (e) => {
    setMessage(e.target.value);

    // Trigger typing indicator
    if (onTyping) onTyping();

    // Reset stop-typing timeout
    if (typingTimeoutRef.current) {
      clearTimeout(typingTimeoutRef.current);
    }

    typingTimeoutRef.current = setTimeout(() => {
      if (onStopTyping) onStopTyping();
    }, 1000);
  };

  const handleSubmit = (e) => {
    e.preventDefault();

    if (!message.trim()) return;

    onSend(message);
    setMessage('');
    
    if (onStopTyping) onStopTyping();

    if (typingTimeoutRef.current) {
      clearTimeout(typingTimeoutRef.current);
    }
  };

  const handleKeyPress = (e) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      handleSubmit(e);
    }
  };

  const handleFileUpload = async (e) => {
    const file = e.target.files[0];
    if (!file) return;

    setUploading(true);

    try {
      const formData = new FormData();
      formData.append('file', file);

      const response = await fetch(
        `${import.meta.env.VITE_API_URL || 'http://localhost:3000'}/api/files/upload`,
        {
          method: 'POST',
          headers: {
            'Authorization': `Bearer ${localStorage.getItem('token')}`
          },
          body: formData
        }
      );

      const data = await response.json();

      if (data.success) {
        // Send message with file attachment
        onSend(`📎 ${file.name}`, [data.file]);
      }
    } catch (error) {
      console.error('File upload failed:', error);
      alert('Failed to upload file');
    } finally {
      setUploading(false);
    }
  };

  return (
    <form className="message-input" onSubmit={handleSubmit}>
      <button
        type="button"
        className="btn-attach"
        onClick={() => fileInputRef.current?.click()}
        disabled={uploading}
        title="Attach file"
      >
        {uploading ? '⏳' : '📎'}
      </button>

      <input
        type="file"
        ref={fileInputRef}
        onChange={handleFileUpload}
        style={{ display: 'none' }}
      />

      <textarea
        value={message}
        onChange={handleChange}
        onKeyDown={handleKeyPress}
        placeholder="Type a message..."
        rows={1}
        disabled={uploading}
        className="message-textarea"
      />

      <button
        type="button"
        className="btn-emoji"
        title="Add emoji"
      >
        😊
      </button>

      <button
        type="submit"
        className="btn-send"
        disabled={!message.trim() || uploading}
      >
        Send
      </button>
    </form>
  );
}