import os
import logging
from collections import defaultdict

logger = logging.getLogger("paddle")
logger.setLevel(logging.INFO)


def build_word_dict(data_dir, save_path, use_col=1, cutoff_fre=1):
    values = defaultdict(int)

    for file_name in os.listdir(data_dir):
        file_path = os.path.join(data_dir, file_name)
        if not os.path.isfile(file_path):
            continue
        with open(file_path, "r") as fdata:
            for line in fdata:
                line_splits = line.strip().split("\t")
                if len(line_splits) < use_col:
                    continue
                doc = line_splits[use_col]
                for sent in doc.strip().split("."):
                    for w in sent.split():
                        values[w] += 1

    values['<unk>'] = cutoff_fre
    with open(save_path, "w") as f:
        for v, count in sorted(
                values.iteritems(), key=lambda x: x[1], reverse=True):
            if count < cutoff_fre:
                break
            f.write("%s\t%d\n" % (v, count))


def build_label_dict(data_dir, save_path, use_col=0):
    values = defaultdict(int)

    for file_name in os.listdir(data_dir):
        file_path = os.path.join(data_dir, file_name)
        if not os.path.isfile(file_path):
            continue
        with open(file_path, "r") as fdata:
            for line in fdata:
                line_splits = line.strip().split("\t")
                if len(line_splits) < use_col:
                    continue
                values[line_splits[use_col]] += 1

    with open(save_path, "w") as f:
        for v, count in sorted(
                values.iteritems(), key=lambda x: x[1], reverse=True):
            f.write("%s\t%d\n" % (v, count))


def load_dict(dict_path):
    return dict((line.strip().split("\t")[0], idx)
                for idx, line in enumerate(open(dict_path, "r").readlines()))


def load_reverse_dict(dict_path):
    return dict((idx, line.strip().split("\t")[0])
                for idx, line in enumerate(open(dict_path, "r").readlines()))