<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Chatbot</title>
    <style>
        body { font-family: sans-serif; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; background-color: #f0f2f5; }
        #chat-container { width: 400px; height: 600px; border: 1px solid #ccc; border-radius: 8px; display: flex; flex-direction: column; background-color: #fff; box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
        #chat-log { flex-grow: 1; padding: 10px; overflow-y: auto; border-bottom: 1px solid #ccc; }
        #chat-input-container { display: flex; padding: 10px; }
        #chat-input { flex-grow: 1; border: 1px solid #ccc; border-radius: 4px; padding: 8px; }
        #send-button { margin-left: 10px; padding: 8px 12px; border: none; background-color: #007bff; color: white; border-radius: 4px; cursor: pointer; }
        .message { margin-bottom: 10px; padding: 8px 12px; border-radius: 18px; max-width: 70%; word-wrap: break-word; }
        .user-message { background-color: #007bff; color: white; align-self: flex-end; margin-left: auto; }
        .bot-message { background-color: #e9e9eb; color: black; align-self: flex-start; }
        .chat-log-inner { display: flex; flex-direction: column; }
    </style>
</head>
<body>
    <div id="chat-container">
        <div id="chat-log">
            <div class="chat-log-inner"></div>
        </div>
        <div id="chat-input-container">
            <input type="text" id="chat-input" placeholder="Type a message...">
            <button id="send-button">Send</button>
        </div>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', () => {
            const chatLog = document.querySelector('#chat-log .chat-log-inner');
            const chatInput = document.getElementById('chat-input');
            const sendButton = document.getElementById('send-button');

            const appendMessage = (text, sender) => {
                const messageElement = document.createElement('div');
                messageElement.classList.add('message', sender + '-message');
                messageElement.textContent = text;
                chatLog.appendChild(messageElement);
                chatLog.parentElement.scrollTop = chatLog.parentElement.scrollHeight;
            };

            const sendMessage = async () => {
                const messageText = chatInput.value.trim();
                if (messageText === '') return;

                appendMessage(messageText, 'user');
                chatInput.value = '';

                try {
                    const response = await fetch('chatbot_api.php', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({ message: messageText })
                    });
                    const data = await response.json();
                    const botResponse = data.reply || 'Sorry, I could not understand.';
                    appendMessage(botResponse, 'bot');
                } catch (error)
                    console.error('Error:', error);
                    appendMessage('Sorry, something went wrong.', 'bot');
                }
            };

            sendButton.addEventListener('click', sendMessage);
            chatInput.addEventListener('keypress', (e) => {
                if (e.key === 'Enter') {
                    sendMessage();
                }
            });
            
            appendMessage("Hello! I'm a chatbot. How can I help you today?", "bot");
        });
    </script>
</body>
</html>