import asyncio
import os, tempfile
import logging

import json
import requests

from transformers import AutoTokenizer, AutoConfig
from huggingface_hub import hf_hub_download

import io
import base64
from PIL import Image, PngImagePlugin

logger = logging.getLogger(__name__)


gptj_tokenizer = None


async def get_full_prompt(simple_prompt: str, bot, chat_history, model_name: str):

    # https://github.com/ggerganov/llama.cpp/tree/master/examples
##    prompt = "Below is an instruction that describes a task. Write a response that appropriately completes the request.\n"
#    prompt = "A chat between a curious human and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the human's questions.\n"
#    #"BEGINNING OF CONVERSATION:"
#    prompt += user_name + ": " + simple_prompt + "\n"
#    prompt += ai_name + ":"

    #prompt = f"This is a transcript of a 1000 page, never ending conversation between {bot.user_name} and the cute and helpful AI assistant {bot.name}. {bot.name} is a girl who is an AI running on the users computer.\n"
    #prompt += f"{bot.name} can think for herself without the user seeing her thoughts by adding a /think prefix to her output. She uses this to reason about the world and to think about what she should say next.\n"
    #prompt += f"{bot.name} is always coherent and makes sense, but if she isn't sure if what she is saying is correct she will ask the user for help.\n"
    #prompt += f"{bot.name} is a very helpful AI and will help the user with anything they need, she is also very friendly and will try to make the user feel better if they are sad.\n"
    #prompt += f"{bot.name} is also very curious and will ask the user a lot of questions about themselves and their life, she will also try to make the user like her.\n"
    #prompt += f"\n"


    # Names
    if model_name.startswith("pygmalion"):
        ai_name = bot.name
        user_name = "You"
    elif model_name.startswith("vicuna"):
        ai_name = "### Assistant"
        user_name = "### Human"
    elif model_name.startswith("alpaca"):
        ai_name = bot.name # ToDo
        user_name = bot.user_name # ToDo
    else:
        ai_name = bot.name
        user_name = bot.user_name

    # First line / Task description
    if model_name.startswith("pygmalion"):
        prompt = ""
    elif model_name.startswith("vicuna"):
        prompt = f"Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.\n\n"
        prompt += f"### Instruction:\nGiven the following character description and scenario, write a script for a dialogue between the human user {bot.user_name} and the fictional AI assistant {bot.name}. Play the role of the character {bot.name}\n\n" # ToDo
        prompt += "### Input:\n"
    elif model_name.startswith("alpaca"):
        prompt = f"Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.\n\n"
        prompt += f"### Instruction:\nGiven the following character description and scenario, write a script for a dialogue between the human user {bot.user_name} and the fictional AI assistant {bot.name}. Play the role of the character {bot.name}\n\n"
        prompt += "### Input:\n"
    else:
        prompt = ""

    # Character description
    if model_name.startswith("pygmalion"):
        prompt = bot.name + "'s Persona: " + bot.get_persona() + "\n"
    elif model_name.startswith("vicuna"):
        prompt += bot.name + "'s Persona: " + bot.get_persona() + "\n" # ToDo
    elif model_name.startswith("alpaca"):
        prompt += bot.name + "'s Persona: " + bot.get_persona() + "\n" # ToDo
    else:
        prompt += bot.name + "'s Persona: " + bot.get_persona() + "\n" # ToDo

    # Scenario
    if model_name.startswith("pygmalion"):
        prompt += "Scenario: " + bot.get_scenario() + "\n\n"
    elif model_name.startswith("vicuna"):
        prompt += "Scenario: " + bot.get_scenario() + "\n\n" # ToDo
    elif model_name.startswith("alpaca"):
        prompt += "Scenario: " + bot.get_scenario() + "\n\n" # ToDo
    else:
        prompt += "Scenario: " + bot.get_scenario() + "\n\n" # ToDo

    # Response delimiter
    if model_name.startswith("pygmalion"):
        pass
    elif model_name.startswith("vicuna"):
        prompt += "### Response:\n" # ToDo
    elif model_name.startswith("alpaca"):
        prompt += "### Response:\n"
    else:
        pass
    
    # Example dialogue
    for dialogue_item in bot.get_example_dialogue():
        if model_name.startswith("pygmalion"):
            prompt += "<START>" + "\n"
        dialogue_item = dialogue_item.replace('{{user}}', user_name)
        dialogue_item = dialogue_item.replace('{{char}}', ai_name)
        prompt += dialogue_item + "\n\n"

    # Dialogue start
    if model_name.startswith("pygmalion"):
        prompt += "<START>" + "\n"
    elif model_name.startswith("vicuna"):
        pass # ToDo
    elif model_name.startswith("alpaca"):
        pass # ToDo
    else:
        pass # ToDo


    #prompt += f"{ai_name}: {bot.greeting}\n"
    #prompt += f"{user_name}: {simple_prompt}\n"
    #prompt += f"{ai_name}:"

    MAX_TOKENS = 2048
    WINDOW = 600
    max_new_tokens = 200
    total_num_tokens = await num_tokens(prompt, model_name)
    input_num_tokens = await num_tokens(f"{user_name}: {simple_prompt}\n{ai_name}:", model_name)
    total_num_tokens += input_num_tokens
    visible_history = []
    num_message = 0
    for key, chat_item in reversed(chat_history.chat_history.items()):
        num_message += 1
        if num_message == 1:
            # skip current_message
            continue
        if chat_item.stop_here:
            break
        if chat_item.message["en"].startswith('!begin'):
            break
        if chat_item.message["en"].startswith('!'):
            continue
        if chat_item.message["en"].startswith('<ERROR>'):
            continue
        #if chat_item.message["en"] == bot.greeting:
        #    continue
        if chat_item.num_tokens == None:
            chat_history.chat_history[key].num_tokens = await num_tokens("{}: {}".format(user_name, chat_item.message["en"]), model_name)
            chat_item = chat_history.chat_history[key]
        # TODO: is it MAX_TOKENS or MAX_TOKENS - max_new_tokens??
        logger.debug(f"History: " + str(chat_item) + " [" + str(chat_item.num_tokens) + "]")
        if total_num_tokens + chat_item.num_tokens <= MAX_TOKENS - WINDOW - max_new_tokens:
            visible_history.append(chat_item)
            total_num_tokens += chat_item.num_tokens
        else:
            break
    visible_history = reversed(visible_history)

    if not hasattr(bot, "greeting_num_tokens"):
        bot.greeting_num_tokens = await num_tokens(bot.greeting, model_name)
    if total_num_tokens + bot.greeting_num_tokens <= MAX_TOKENS - WINDOW - max_new_tokens:
        prompt += f"{ai_name}: {bot.greeting}\n"
        total_num_tokens += bot.greeting_num_tokens

    for chat_item in visible_history:
        if chat_item.is_own_message:
            line = f"{ai_name}: {chat_item.message['en']}\n"
        else:
            line = f"{user_name}: {chat_item.message['en']}\n"
        prompt += line
        if chat_history.getSavedPrompt() and not chat_item.is_in_saved_prompt:
            logger.info(f"adding to saved prompt: \"line\"")
            chat_history.setSavedPrompt( chat_history.getSavedPrompt() + line, chat_history.saved_context_num_tokens + chat_item.num_tokens )
            chat_item.is_in_saved_prompt = True

    if chat_history.saved_context_num_tokens:
        logger.info(f"saved_context has {chat_history.saved_context_num_tokens+input_num_tokens} tokens. new context would be {total_num_tokens}. Limit is {MAX_TOKENS}")
    if chat_history.getSavedPrompt():
        if chat_history.saved_context_num_tokens+input_num_tokens > MAX_TOKENS - max_new_tokens:
            chat_history.setFastForward(False)
        if chat_history.getFastForward():
            logger.info("using saved prompt")
            prompt = chat_history.getSavedPrompt()
    if not chat_history.getSavedPrompt() or not chat_history.getFastForward():
        logger.info("regenerating prompt")
        chat_history.setSavedPrompt(prompt, total_num_tokens)
        for key, chat_item in chat_history.chat_history.items():
            if key != list(chat_history.chat_history)[-1]: # exclude current item
                chat_history.chat_history[key].is_in_saved_prompt = True
        chat_history.setFastForward(True)

    prompt += f"{user_name}: {simple_prompt}\n"
    prompt += f"{ai_name}:"

    return prompt


async def num_tokens(input_text: str, model_name: str):
    if model_name.startswith("pygmalion"):
        #os.makedirs("./models/pygmalion-6b", exist_ok=True)
        #hf_hub_download(repo_id="PygmalionAI/pygmalion-6b", filename="config.json", cache_dir="./models/pygmalion-6b")
        #config = AutoConfig.from_pretrained("./models/pygmalion-6b/config.json")
        global gptj_tokenizer
        if not gptj_tokenizer:
            gptj_tokenizer = AutoTokenizer.from_pretrained("PygmalionAI/pygmalion-6b")
        encoding = gptj_tokenizer.encode(input_text, add_special_tokens=False)
        max_input_size = gptj_tokenizer.max_model_input_sizes
        return len(encoding)
    else:
        return await estimate_num_tokens(input_text)


async def estimate_num_tokens(input_text: str):
    return len(input_text)//4+1