import gradio as gr
from openai import OpenAI
import time
import html

def predict(message, history, character, api_key, progress=gr.Progress()):
    client = OpenAI(api_key=api_key)
    history_openai_format = []
    for human, assistant in history:
        history_openai_format.append({"role": "user", "content": human})
        history_openai_format.append({"role": "assistant", "content": assistant})
    history_openai_format.append({"role": "user", "content": message})

    response = client.chat.completions.create(
        model='gpt-4',
        messages=history_openai_format,
        temperature=1.0,
        stream=True
    )

    partial_message = ""
    for chunk in progress.tqdm(response, desc="Generating"):
        if chunk.choices[0].delta.content:
            partial_message += chunk.choices[0].delta.content
            yield partial_message
        time.sleep(0.01)

def format_history(history):
    html_content = ""
    for human, ai in history:
        human_formatted = html.escape(human).replace('\n', '<br>')
        html_content += f'<div class="message user-message"><strong>You:</strong> {human_formatted}</div>'
        if ai:
            ai_formatted = html.escape(ai).replace('\n', '<br>')
            html_content += f'<div class="message ai-message"><strong>AI:</strong> {ai_formatted}</div>'
    return html_content

css = """
#chat-display {
    height: 600px;
    overflow-y: auto;
    border: 1px solid #ccc;
    padding: 10px;
    margin-bottom: 10px;
}
#chat-display::-webkit-scrollbar {
    width: 10px;
}
#chat-display::-webkit-scrollbar-track {
    background: #f1f1f1;
}
#chat-display::-webkit-scrollbar-thumb {
    background: #888;
}
#chat-display::-webkit-scrollbar-thumb:hover {
    background: #555;
}
.message {
    margin-bottom: 10px;
    max-height: 300px;
    overflow-y: auto;
    word-wrap: break-word;
}
.user-message {
    background-color: #e6f3ff;
    padding: 5px;
    border-radius: 5px;
}
.ai-message {
    background-color: #f0f0f0;
    padding: 5px;
    border-radius: 5px;
}
"""

js = """
function maintainScroll(element_id) {
    let element = document.getElementById(element_id);
    let shouldScroll = element.scrollTop + element.clientHeight === element.scrollHeight;
    let previousScrollTop = element.scrollTop;
    
    return function() {
        if (!shouldScroll) {
            element.scrollTop = previousScrollTop;
        } else {
            element.scrollTop = element.scrollHeight;
        }
    }
}

let scrollMaintainer = maintainScroll('chat-display');
setInterval(scrollMaintainer, 100);

// Add event listener for Ctrl+Enter and prevent default Enter behavior
document.addEventListener('DOMContentLoaded', (event) => {
    const textbox = document.querySelector('#your_message textarea');
    textbox.addEventListener('keydown', function(e) {
        if (e.ctrlKey && e.key === 'Enter') {
            e.preventDefault();
            document.querySelector('#your_message button').click();
        } else if (e.key === 'Enter' && !e.shiftKey) {
            e.preventDefault();
            const start = this.selectionStart;
            const end = this.selectionEnd;
            this.value = this.value.substring(0, start) + "\\n" + this.value.substring(end);
            this.selectionStart = this.selectionEnd = start + 1;
        }
    });
});
"""

with gr.Blocks(css=css, js=js) as demo:
    gr.Markdown("<h1 style='text-align: center; margin-bottom: 1rem'>My Chatbot</h1>")
    
    chat_history = gr.State([])
    chat_display = gr.HTML(elem_id="chat-display")
    msg = gr.Textbox(
        label="Your message", 
        lines=2, 
        max_lines=10, 
        placeholder="Type your message here... (Press Ctrl+Enter to send, Enter for new line)",
        elem_id="your_message"
    )
    clear = gr.Button("Clear")

    dropdown = gr.Dropdown(
        ["Character 1", "Character 2", "Character 3", "Character 4", "Character 5", "Character 6", "Character 7", "Character 8", "Character 9", "Character 10", "Character 11", "Character 12", "Character 13"],
        label="Characters",
        info="Select the character that you'd like to speak to",
        value="Character 1"
    )
    api_key = gr.Textbox(type="password", label="OpenAI API Key")

    def user(user_message, history):
        history.append([user_message, None])
        return "", history, format_history(history)

    def bot(history, character, api_key):
        user_message = history[-1][0]
        bot_message_generator = predict(user_message, history[:-1], character, api_key)
        for chunk in bot_message_generator:
            history[-1][1] = chunk
            yield history, format_history(history)

    msg.submit(user, [msg, chat_history], [msg, chat_history, chat_display]).then(
        bot, [chat_history, dropdown, api_key], [chat_history, chat_display]
    )
    clear.click(lambda: ([], []), None, [chat_history, chat_display], queue=False)
    dropdown.change(lambda x: ([], []), dropdown, [chat_history, chat_display])

demo.queue()
demo.launch(max_threads=20)