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from functools import partial
import logging
from pathlib import Path
from time import perf_counter

import gradio as gr
from jinja2 import Environment, FileSystemLoader

from backend.query_llm import generate
from backend.semantic_search import qd_retriever

proj_dir = Path(__file__).parent
# Setting up the logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Set up the template environment with the templates directory
env = Environment(loader=FileSystemLoader(proj_dir / 'templates'))

# Load the templates directly from the environment
template = env.get_template('template.j2')
template_html = env.get_template('template_html.j2')

# Examples
examples = ['What is the capital of China?',
            'Why is the sky blue?',
            'Who won the mens world cup in 2014?', ]


def add_text(history, text):
    history = [] if history is None else history
    history = history + [(text, None)]
    return history, gr.Textbox(value="", interactive=False)


def bot(history, hyde=False):
    top_k = 4
    query = history[-1][0]

    logger.warning('Retrieving documents...')
    # Retrieve documents relevant to query
    document_start = perf_counter()
    if hyde:
        hyde_document = ""
        generator = generate(f"Write a wikipedia article intro paragraph to answer this query: {query}", history)
        for output_chunk in generator:
            hyde_document = output_chunk

        logger.warning(hyde_document)
        documents = qd_retriever.retrieve(hyde_document, top_k=top_k)
    else:
        documents = qd_retriever.retrieve(query, top_k=top_k)
    document_time = perf_counter() - document_start
    logger.warning(f'Finished Retrieving documents in {round(document_time, 2)} seconds...')

    # Create Prompt
    prompt = template.render(documents=documents, query=query)
    prompt_html = template_html.render(documents=documents, query=query)

    history[-1][1] = ""
    for character in generate(prompt, history[:-1]):
        history[-1][1] = character
        yield history, prompt_html


with gr.Blocks() as demo:
    with gr.Tab("RAGDemo"):
        chatbot = gr.Chatbot(
                [],
                elem_id="chatbot",
                avatar_images=('https://aui.atlassian.com/aui/8.8/docs/images/avatar-person.svg',
                               'https://huggingface.co/datasets/huggingface/brand-assets/resolve/main/hf-logo.svg'),
                bubble_full_width=False,
                show_copy_button=True,
                show_share_button=True,
                )

        with gr.Row():
            txt = gr.Textbox(
                    scale=3,
                    show_label=False,
                    placeholder="Enter text and press enter",
                    container=False,
                    )
            txt_btn = gr.Button(value="Submit text", scale=1)

        # Examples
        gr.Examples(examples, txt)

        prompt_html = gr.HTML()
        # Turn off interactivity while generating if you click
        txt_msg = txt_btn.click(add_text, [chatbot, txt], [chatbot, txt], queue=False).then(
                bot, chatbot, [chatbot, prompt_html])

        # Turn it back on
        txt_msg.then(lambda: gr.Textbox(interactive=True), None, [txt], queue=False)

        # Turn off interactivity while generating if you hit enter
        txt_msg = txt.submit(add_text, [chatbot, txt], [chatbot, txt], queue=False).then(
                bot, chatbot, [chatbot, prompt_html])

        # Turn it back on
        txt_msg.then(lambda: gr.Textbox(interactive=True), None, [txt], queue=False)

    with gr.Tab("RAGDemo + HyDE"):
        hyde_chatbot = gr.Chatbot(
                [],
                elem_id="chatbot",
                avatar_images=('https://aui.atlassian.com/aui/8.8/docs/images/avatar-person.svg',
                               'https://huggingface.co/datasets/huggingface/brand-assets/resolve/main/hf-logo.svg'),
                bubble_full_width=False,
                show_copy_button=True,
                show_share_button=True,
                )

        with gr.Row():
            hyde_txt = gr.Textbox(
                    scale=3,
                    show_label=False,
                    placeholder="Enter text and press enter",
                    container=False,
                    )
            hyde_txt_btn = gr.Button(value="Submit text", scale=1)

        # Examples
        gr.Examples(examples, hyde_txt)

        hyde_prompt_html = gr.HTML()
        # Turn off interactivity while generating if you click
        hyde_txt_msg = hyde_txt_btn.click(add_text, [hyde_chatbot, hyde_txt], [hyde_chatbot, hyde_txt], queue=False).then(
                partial(bot, hyde=True), [hyde_chatbot], [hyde_chatbot, hyde_prompt_html])

        # Turn it back on
        hyde_txt_msg.then(lambda: gr.Textbox(interactive=True), None, [hyde_txt], queue=False)

        # Turn off interactivity while generating if you hit enter
        hyde_txt_msg = hyde_txt.submit(add_text, [hyde_chatbot, hyde_txt], [hyde_chatbot, hyde_txt], queue=False).then(
                partial(bot, hyde=True), [hyde_chatbot], [hyde_chatbot, hyde_prompt_html])

        # Turn it back on
        hyde_txt_msg.then(lambda: gr.Textbox(interactive=True), None, [hyde_txt], queue=False)

demo.queue()
demo.launch(debug=True)