import os
from os import listdir
from os.path import isfile, join
import json

INSTRUCT_CHUNKED_PROMPT = """你是一个擅长翻译科技新闻的翻译专家。请将以下内容翻译为中文，使用相同格式输出，并保留时间戳。不要漏掉任何信息。合并多行文本时，保留第一个和最后一个时间戳。"""

DOCUMENT_ROOT = "data"
files = listdir("data")

all_datapoints = []

for f in files:
    en_fname = join(DOCUMENT_ROOT, f)
    if en_fname.endswith(".en.txt") and isfile(en_fname):
        cn_fname = join(DOCUMENT_ROOT, f.replace(".en.txt", ".cn.txt"))
        if os.path.exists(cn_fname) and isfile(cn_fname):
            print(f"Found data pair: {en_fname} and {cn_fname}")

            with open(en_fname, "r", encoding='utf-8-sig') as enfin:
                en_messages = enfin.read()

            with open(cn_fname, "r", encoding='utf-8-sig') as cnfin:
                cn_messages = cnfin.read()
            
            en_messages = [part.strip() for part in en_messages.split("\n\n") if part.strip() != ""]
            cn_messages = [part.strip() for part in cn_messages.split("\n\n") if part.strip() != ""]

            if(len(en_messages) != len(cn_messages)):
                print(f"English and Chinese version mismatch. Discarding {en_fname} pair.")
            
            # Write document
            history = []
            for en, cn in zip(en_messages, cn_messages):
                all_datapoints.append({
                    'system': INSTRUCT_CHUNKED_PROMPT, 
                    'input': en,
                    'output': cn,
                    'history': history
                })
                history.append([en, cn])

import random
shuffled = random.shuffle(all_datapoints)

COUNT = len(all_datapoints)
TRAIN = int(0.8 * COUNT)

train_dataset = all_datapoints[:TRAIN]
evaluation_dataset = all_datapoints[TRAIN:]

with open("train.json", "w", encoding='utf-8-sig') as train_f:
    for d in train_dataset:
        json.dump(d, train_f)
        train_f.write('\n')

with open("test.json", "w", encoding='utf-8-sig') as ev_f:
    for d in evaluation_dataset:
        json.dump(d, ev_f)
        ev_f.write('\n')