import pandas as pd
import os
import gzip
import random
import re
from tqdm import tqdm
from collections import defaultdict


def get_all_files_in_directory(directory, ext=''):
    all_files = []
    for root, dirs, files in os.walk(directory):
        root = root[len(directory):]
        if root.startswith('\\') or root.startswith('/'):
            root = root[1:]
        for file in files:
            if file.endswith(ext):
                file_path = os.path.join(root, file)
                all_files.append(file_path)
    return all_files

reg_q = re.compile(r'''['"“”‘’「」『』]''')
reg_e = re.compile(r'''[?!。？！]''')
def readOne(filePath):
    with gzip.open(filePath, 'rt', encoding='utf-8') if filePath.endswith('.gz') else open(filePath,
                                                                                           encoding='utf-8') as f:
        retn = []
        cache = ''
        for line in f:
            line = reg_q.sub('', line)  # 删除引号
            if len(cache) + len(line) < 384:
                cache += line
                continue
            if not bool(reg_e.findall(line)):
                cache += line
                retn.append(cache.strip())
                cache = ''
                continue
            i = 1
            s = 0
            while i <= len(line):
                if len(cache) + (i - s) < 384:  # 每 384 切一行
                    i = (384 - len(cache)) + s
                    if i > len(line):
                        break
                    cache += line[s:i]
                    s = i
                if line[i-1] in ('?', '!', '。', '？', '！'):
                    cache += line[s:i]
                    s = i
                    retn.append(cache.strip())
                    cache = ''
                i += 1
            if len(line) > s:
                cache += line[s:]

    cache = cache.strip()
    if cache:
        retn.append(cache)
    return retn


def load_dataset(path):
    df = pd.read_parquet(path, engine="pyarrow")
    return df


def load_all_dataset(path, convert=False):
    qrels_pd = load_dataset(path + r'\qrels.parquet')
    corpus = load_dataset(path + r'\corpus.parquet')
    queries = load_dataset(path + r'\queries.parquet')
    if convert:
        qrels = defaultdict(dict)
        for i, e in tqdm(qrels_pd.iterrows(), desc="load_all_dataset: Converting"):
            qrels[e['qid']][e['cid']] = e['score']
    else:
        qrels = qrels_pd
    return corpus, queries, qrels


def save_dataset(path, df):
    return df.to_parquet(
        path,
        engine="pyarrow",
        compression="gzip",
        index=False
    )


def save_all_dataset(path, corpus, queries, qrels):
    save_dataset(path + r"\corpus.parquet", corpus)
    save_dataset(path + r"\queries.parquet", queries)
    save_dataset(path + r"\qrels.parquet", qrels)


def create_dataset(corpus, queries, qrels):
    corpus_pd = pd.DataFrame(corpus, columns=['cid', 'text'])
    queries_pd = pd.DataFrame(queries, columns=['qid', 'text'])
    qrels_pd = pd.DataFrame(qrels, columns=['qid', 'cid', 'score'])

    corpus_pd['cid'] = corpus_pd['cid'].astype(str)
    queries_pd['qid'] = queries_pd['qid'].astype(str)
    qrels_pd['qid'] = qrels_pd['qid'].astype(str)
    qrels_pd['cid'] = qrels_pd['cid'].astype(str)
    qrels_pd['score'] = qrels_pd['score'].astype(int)

    return corpus_pd, queries_pd, qrels_pd


def sample_from_dataset(corpus, queries, qrels, k=5000):
    sample_k = sorted(random.sample(queries['qid'].to_list(), k=k))
    queries_pd = queries[queries['qid'].isin(sample_k)]
    qrels_pd = qrels[qrels['qid'].isin(sample_k)]
    corpus_pd = corpus[corpus['cid'].isin(qrels_pd['cid'])]

    return corpus_pd, queries_pd, qrels_pd

path = r'D:\datasets\h-corpus\h-ss-corpus'
rawcorpus = get_all_files_in_directory(path, '.txt.gz')
corpus = []
queries = []
qrels = []

for sub_path in tqdm(rawcorpus[103045:], desc="Reading all data..."):
    tmp = readOne(os.path.join(path, sub_path))
    if len(tmp) < 5:
        continue
    阈值 = max(len(tmp) // 4, 4)  # 大约每个文件抽 4*5 = 20 条语料
    # print(阈值)
    old_rand = None
    for i in range(len(tmp)):
        rand = random.randint(0, 阈值)
        if rand == 0 and (old_rand is None or old_rand != 0):
            queries.append((sub_path, i/(len(tmp)-1), tmp[i]))
        elif rand <= 4 or old_rand == 0:
            corpus.append((sub_path, i/(len(tmp)-1), tmp[i]))
            rand = 1
        else:
            pass
        old_rand = rand

tmp = random.sample(range(len(queries)), k=5000)
tmp.sort()
queries = [queries[i] for i in tmp]

sidx = 0
for qid, q in tqdm(enumerate(queries), desc="计算 qrels 中..."):
    mt = False
    for cid in range(sidx, len(corpus)):
        c = corpus[cid]
        if q[0] == c[0]:
            mt = True
            ss = 1 - abs(q[1] - c[1])
            qrels.append((qid, cid, 100 * ss))
        else:
            if mt:
                sidx = cid + 1
                break

corpus_ = [(cid, c[2]) for cid, c in enumerate(corpus)]
queries_ = [(qid, q[2]) for qid, q in enumerate(queries)]

path = r'D:\datasets\H2Retrieval\new'
corpus_pd, queries_pd, qrels_pd = create_dataset(corpus_, queries_, qrels)
tmp = corpus_pd[corpus_pd['cid'].isin(qrels_pd['cid'])]
corpus_pd = tmp
save_all_dataset(path + r'\data', corpus_pd, queries_pd, qrels_pd)
save_all_dataset(path + r'\data_sample1k', *sample_from_dataset(corpus_pd, queries_pd, qrels_pd, k=1000))


# save_all_dataset(path + r'\data_sample1k', *sample_from_dataset(*load_all_dataset(r'D:\datasets\H2Retrieval\new\data_sample5k'), k=1000))

tmp = load_all_dataset(r'D:\datasets\H2Retrieval\new\data')