import os
import re
import torch
from threading import Thread
from typing import Iterator
from mongoengine import connect, Document, StringField, SequenceField
import gradio as gr
import spaces
from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig, TextIteratorStreamer
from peft import PeftModel
import openai
from openai import OpenAI
import logging



openai.api_key = os.environ.get("OPENAI_KEY")

# Set up logging configuration
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

# Example usage of logging in your function
def generate_image(text):
    try:
        logging.debug("Generating image with prompt: %s", text)
        response = openai.images.generate(
            model="dall-e-3",
            prompt="Create a 4 panel pixar style illustration that accurately depicts the character and the setting of a story:" + text,
            n=1,
            size="1024x1024"
        )
        image_url = response.data[0].url
        logging.info("Image generated successfully: %s", image_url)
        return image_url
    except Exception as error:
        logging.error("Failed to generate image: %s", str(error))
        raise gr.Error("An error occurred while generating the image. Please check your API key and try again.")

    

# Constants
MAX_MAX_NEW_TOKENS = 2048
DEFAULT_MAX_NEW_TOKENS = 1024
MAX_INPUT_TOKEN_LENGTH = int(os.getenv("MAX_INPUT_TOKEN_LENGTH", "4096"))

LICENSE = """
---
As a derivative work of [Llama-2-7b-hf](https://huggingface.co/meta-llama/Llama-2-7b-hf) by Meta,
this demo is governed by the original [license](https://huggingface.co/spaces/huggingface-projects/llama-2-7b-chat/blob/main/LICENSE.txt) and [acceptable use policy](https://huggingface.co/spaces/huggingface-projects/llama-2-7b-chat/blob/main/USE_POLICY.md).
"""

# GPU Check and add CPU warning
if not torch.cuda.is_available():
    DESCRIPTION += "\n<p>Running on CPU 🥶 This demo does not work on CPU.</p>"

if torch.cuda.is_available():

    # Model and Tokenizer Configuration
    model_id = "meta-llama/Llama-3.1-8B-Instruct"
    bnb_config = BitsAndBytesConfig(
        load_in_4bit=True,
        bnb_4bit_use_double_quant=False,
        bnb_4bit_quant_type="nf4",
        bnb_4bit_compute_dtype=torch.bfloat16
    )
    base_model = AutoModelForCausalLM.from_pretrained(model_id, device_map="auto", quantization_config=bnb_config)
    model = PeftModel.from_pretrained(base_model, "ranamhamoud/storytell")
    tokenizer = AutoTokenizer.from_pretrained(model_id)
    tokenizer.pad_token = tokenizer.eos_token


def make_prompt(entry):
    return  f"### Human: When asked to explain use a story.Don't repeat the assesments, limit to 500 words.However keep context in mind if edits to the content is required. {entry} ### Assistant:"

def process_text(text):

    text = re.sub(r'\[answer:\]\s*', 'Answer: ', text)
    text = re.sub(r'\[.*?\](?<!Answer: )', '', text)
    
    return text
    
custom_css = """
body, input, button, textarea, label {
    font-family: Arial, sans-serif;
    font-size: 24px;
}
.gr-chat-interface .gr-chat-message-container {
    font-size: 14px;
}
.gr-button {
    font-size: 14px;
    padding: 12px 24px;
}
.gr-input {
    font-size: 14px;
}
"""

def process_text(text):
    text = re.sub(r'\[assessment;[^\]]*\]', '', text, flags=re.DOTALL)
    text = re.sub(r'\[.*?\]', '', text, flags=re.DOTALL)
    return text
    
@spaces.GPU
def generate(
    message: str,
    chat_history: list[tuple[str, str]],
    max_new_tokens: int = DEFAULT_MAX_NEW_TOKENS,
    temperature: float = 0.8,
    top_p: float = 0.7,
    top_k: int = 30,
    repetition_penalty: float = 1.0,
) -> Iterator[str]:
    conversation = []
    for user, assistant in chat_history:
        conversation.extend([{"role": "user", "content": user}, {"role": "assistant", "content": assistant}])
    conversation.append({"role": "user", "content": make_prompt(message)})
    enc = tokenizer(make_prompt(message), return_tensors="pt", padding=True, truncation=True)
    input_ids = enc.input_ids.to(model.device)
    if input_ids.shape[1] > MAX_INPUT_TOKEN_LENGTH:
        input_ids = input_ids[:, -MAX_INPUT_TOKEN_LENGTH:]
        gr.Warning(f"Trimmed input from conversation as it was longer than {MAX_INPUT_TOKEN_LENGTH} tokens.")
    
    streamer = TextIteratorStreamer(tokenizer, timeout=10.0, skip_prompt=True, skip_special_tokens=False)
    generate_kwargs = dict(
        {"input_ids": input_ids},
        streamer=streamer,
        max_new_tokens=max_new_tokens,
        do_sample=True,
        top_p=top_p,
        top_k=top_k,
        temperature=temperature,
        num_beams=1,
        repetition_penalty=repetition_penalty,
    )
    t = Thread(target=model.generate, kwargs=generate_kwargs)
    t.start()

    outputs = []
    for text in streamer:
        processed_text = process_text(text)
        outputs.append(processed_text)
        output = "".join(outputs)
        yield output

    final_story = "".join(outputs)
    final_story_trimmed = remove_last_sentence(final_story)
    
    image_url = generate_image(final_story_trimmed)
    return f"{final_story}\n\n![Generated Image]({image_url})"


def remove_last_sentence(text):
    sentences = re.split(r'(?<=\.)\s', text)
    return ' '.join(sentences[:-1]) if sentences else text

chat_interface = gr.ChatInterface(
    fn=generate,
    fill_height=True,
    stop_btn=None,
    examples=[
         ["Tell me about HTTP."],
        ["Can you explain briefly to me what is the Python programming language?"],
        ["Could you please provide an explanation about Data Science?"],
        ["Could you explain what a URL is?"]
    ],
    theme='shivi/calm_seafoam',autofocus=True, 
)
js_func = """
function refresh() {
    const url = new URL(window.location);

    if (url.searchParams.get('__theme') !== 'light') {
        url.searchParams.set('__theme', 'light');
        window.location.href = url.href;
    }
}
"""
# Gradio Web Interface
with gr.Blocks(css=custom_css,fill_height=True,theme="shivi/calm_seafoam") as demo:
        chat_interface.render()
    
    # gr.Markdown(LICENSE)

        
# Main Execution
if __name__ == "__main__":
    demo.queue(max_size=20)
    demo.launch(share=True)