import os, sys

import gradio as gr
import mdtex2html

import torch
import transformers
from transformers import (
    AutoConfig,
    AutoModel,
    AutoTokenizer,
    AutoTokenizer,
    DataCollatorForSeq2Seq,
    HfArgumentParser,
    Seq2SeqTrainingArguments,
    set_seed,
)

from arguments import ModelArguments, DataTrainingArguments


model = None
tokenizer = None

"""Override Chatbot.postprocess"""


def postprocess(self, y):
    if y is None:
        return []
    for i, (message, response) in enumerate(y):
        y[i] = (
            None if message is None else mdtex2html.convert((message)),
            None if response is None else mdtex2html.convert(response),
        )
    return y


gr.Chatbot.postprocess = postprocess


def parse_text(text):
    """copy from https://github.com/GaiZhenbiao/ChuanhuChatGPT/"""
    lines = text.split("\n")
    lines = [line for line in lines if line != ""]
    count = 0
    for i, line in enumerate(lines):
        if "```" in line:
            count += 1
            items = line.split('`')
            if count % 2 == 1:
                lines[i] = f'<pre><code class="language-{items[-1]}">'
            else:
                lines[i] = f'<br></code></pre>'
        else:
            if i > 0:
                if count % 2 == 1:
                    line = line.replace("`", "\`")
                    line = line.replace("<", "&lt;")
                    line = line.replace(">", "&gt;")
                    line = line.replace(" ", "&nbsp;")
                    line = line.replace("*", "&ast;")
                    line = line.replace("_", "&lowbar;")
                    line = line.replace("-", "&#45;")
                    line = line.replace(".", "&#46;")
                    line = line.replace("!", "&#33;")
                    line = line.replace("(", "&#40;")
                    line = line.replace(")", "&#41;")
                    line = line.replace("$", "&#36;")
                lines[i] = "<br>"+line
    text = "".join(lines)
    return text


def predict(input, chatbot, max_length, top_p, temperature, history):
    chatbot.append((parse_text(input), ""))
    for response, history in model.stream_chat(tokenizer, input, history, max_length=max_length, top_p=top_p,
                                               temperature=temperature):
        chatbot[-1] = (parse_text(input), parse_text(response))       

        yield chatbot, history


def reset_user_input():
    return gr.update(value='')


def reset_state():
    return [], []


with gr.Blocks() as demo:
    gr.HTML("""<h1 align="center">ChatGLM</h1>""")

    chatbot = gr.Chatbot()
    with gr.Row():
        with gr.Column(scale=4):
            with gr.Column(scale=12):
                user_input = gr.Textbox(show_label=False, placeholder="Input...", lines=10).style(
                    container=False)
            with gr.Column(min_width=32, scale=1):
                submitBtn = gr.Button("Submit", variant="primary")
        with gr.Column(scale=1):
            emptyBtn = gr.Button("Clear History")
            max_length = gr.Slider(0, 4096, value=64, step=1.0, label="Maximum length", interactive=True)
            top_p = gr.Slider(0, 1, value=0.7, step=0.01, label="Top P", interactive=True)
            temperature = gr.Slider(0, 1, value=0.95, step=0.01, label="Temperature", interactive=True)

    history = gr.State([])

    submitBtn.click(predict, [user_input, chatbot, max_length, top_p, temperature, history], [chatbot, history],
                    show_progress=True)
    submitBtn.click(reset_user_input, [], [user_input])

    emptyBtn.click(reset_state, outputs=[chatbot, history], show_progress=True)



def main():
    global model, tokenizer

    parser = HfArgumentParser((
        ModelArguments))

    tokenizer = AutoTokenizer.from_pretrained(
        "THUDM/chatglm-6b-int4", trust_remote_code=True)
    config = AutoConfig.from_pretrained(
        "THUDM/chatglm-6b-int4", trust_remote_code=True)

    config.pre_seq_len = 128
    config.prefix_projection = False

    ptuning_checkpoint = "checkpoint-500"

    if ptuning_checkpoint is not None:
        print(f"Loading prefix_encoder weight from {ptuning_checkpoint}")
        model = AutoModel.from_pretrained("THUDM/chatglm-6b-int4", config=config, trust_remote_code=True)
        prefix_state_dict = torch.load(os.path.join(ptuning_checkpoint, "pytorch_model.bin"))
        new_prefix_state_dict = {}
        for k, v in prefix_state_dict.items():
            if k.startswith("transformer.prefix_encoder."):
                new_prefix_state_dict[k[len("transformer.prefix_encoder."):]] = v
        model.transformer.prefix_encoder.load_state_dict(new_prefix_state_dict)
    else:
        model = AutoModel.from_pretrained("THUDM/chatglm-6b-int4", config=config, trust_remote_code=True)

    # model = model.quantize(4)

    # P-tuning v2
    # model = model.half()
    # model.transformer.prefix_encoder.float()

    model.float()
    
    model = model.eval()
    demo.queue().launch(share=False, inbrowser=True)



if __name__ == "__main__":
    main()