import random
import tqdm
import os
import sys
import torch
import jsonlines
import argparse
import jsonlines
from pathlib import Path
import re
import textwrap
from transformers import AutoModelForCausalLM, AutoTokenizer
from transformers.generation import GenerationConfig

"""
Get the HumanEval.jsonl file from [here](https://github.com/openai/human-eval/tree/master/data)

python eval/evaluate_chat_humaneval.py -f HumanEval.jsonl -o HumanEval_res.jsonl
git clone https://github.com/openai/human-eval
pip install -e human-eval
evaluate_functional_correctness HumanEval_res.jsonl
"""

DEVICE = "cuda:0"

def extract_code(text, entry_point):

    # 正则表达式匹配代码块
    code_block_pattern = re.compile(rf"```(?:[Pp]ython\n)?.*?def\s+{entry_point}.*?:\n(.*?)\n```", re.DOTALL)
    code_block = code_block_pattern.search(text)
    if code_block is None:
        code_block_pattern = re.compile(rf"def\s+{entry_point}.*?:\n(.*?)(?:\n(?!\n*(?:  |\t))|$)", re.DOTALL)
        code_block = code_block_pattern.search(text)
    if code_block is None:
        code_block_pattern = re.compile(rf"def.*?:\n(.*?)(?:\n(?!\n*(?:  |\t))|$)", re.DOTALL)
        code_block = code_block_pattern.search(text)

    if code_block is not None:
        return code_block.group(1)
    else:
        # if no code block is found, assume the LM is simply filling the code
        return textwrap.indent(text, ' ' * 4)

def generate_sample(model, tokenizer, question, entry_point):
    response, history = model.chat(
        tokenizer,
        question,
        history=None,
    )
    print(question)
    print(response)
    answer = extract_code(response, entry_point)
    return answer, response

if __name__ == '__main__':

    parser = argparse.ArgumentParser(description='Test HF checkpoint.')
    parser.add_argument("-c", "--checkpoint-path", type=Path, help='Checkpoint path', default="Qwen/Qwen-7B-Chat")
    parser.add_argument("-f","--sample-input-file", type=str, default=None, help="data path to HumanEval.jsonl")
    parser.add_argument("-o","--sample-output-file", type=str, default="HumanEval_res.jsonl")


    args = parser.parse_args()
    print('Loading tokenizer ...')
    tokenizer = AutoTokenizer.from_pretrained(args.checkpoint_path, trust_remote_code=True)

    print('Loading model ...')
    model = AutoModelForCausalLM.from_pretrained(args.checkpoint_path, device_map="auto", trust_remote_code=True, bf16=True, use_flash_attn=True).eval()
    model.generation_config = GenerationConfig.from_pretrained(args.checkpoint_path, trust_remote_code=True)
    model.generation_config.do_sample = False # use greedy decoding

    f_output = jsonlines.Writer(open(args.sample_output_file, 'w', encoding='utf-8'))

    f = jsonlines.open(args.sample_input_file)
    with f_output as output:
        for jobj in tqdm.tqdm(f, desc='task_idx'):
            prompt = "Help me fill the following code.\n" + jobj['prompt']
            task_id = jobj['task_id']
            answer, response = generate_sample(model, tokenizer, prompt, jobj['entry_point'])
            gen_jobjs = {'task_id': task_id, "completion": answer, 'response': response} 
            output.write(gen_jobjs)
    f_output.close()
