import os

os.environ['CUDA_LAUNCH_BLOCKING'] = '1'

import torch
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer
from threading import Thread

examples = ["Python和JavaScript编程语言的主要区别是什么？", "影响消费者行为的主要因素是什么？", "请用pytorch实现一个带ReLU激活函数的全连接层的代码",
            "请用C++编程语言实现“给你两个字符串haystack和needle，在haystack字符串中找出needle字符串的第一个匹配项的下标（下标从 0 开始）。如果needle不是haystack的一部分，则返回-1。",
            "如何使用ssh -L，请用具体例子说明", "应对压力最有效的方法是什么？"]


def init_model():
    model = AutoModelForCausalLM.from_pretrained("Linly-AI/Chinese-LLaMA-2-7B-hf", device_map="cuda:0",
                                                 torch_dtype=torch.bfloat16, trust_remote_code=True)
    tokenizer = AutoTokenizer.from_pretrained("Linly-AI/Chinese-LLaMA-2-7B-hf", use_fast=False, trust_remote_code=True)
    streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True, timeout=30.)
    return model, tokenizer, streamer


def process(message, history):
    input_prompt = ""
    for interaction in history:
        input_prompt = f"{input_prompt} User: {str(interaction[0]).strip(' ')} Bot: {str(interaction[1]).strip(' ')}"
    input_prompt = f"{input_prompt} ### Instruction:{message.strip()}  ### Response:"

    inputs = tokenizer(input_prompt, return_tensors="pt").to("cuda:0")
    generation_kwargs = dict(inputs, streamer=streamer, max_new_tokens=2048, do_sample=True,
                             top_k=20, top_p=0.84, temperature=1.0, repetition_penalty=1.15, eos_token_id=2,
                             bos_token_id=1, pad_token_id=0)
    try:
        t = Thread(target=model.generate, kwargs=generation_kwargs)
        t.start()
        response = ""
        for text in streamer:
            response += text
            yield response
        print('-log:', response)
    except Exception as e:
        print('-error:', str(e))
        return "Error: 遇到错误，请开启新的会话重新尝试~"


if __name__ == '__main__':
    model, tokenizer, streamer = init_model()

    demo = gr.ChatInterface(
        process,
        chatbot=gr.Chatbot(height=600, show_label=True, label="Linly"),
        textbox=gr.Textbox(placeholder="Input", container=True, scale=7, lines=3, show_label=False),
        title="Linly ChatFlow",
        description="",
        theme="soft",
        examples=examples,
        cache_examples=True,
        retry_btn="Retry",
        undo_btn="Delete Previous",
        clear_btn="Clear",
    )
    demo.queue().launch()