import json
import os
from os.path import join as p_join
from tqdm import tqdm
from typing import Dict
from glob import glob

from soundfile import LibsndfileError
from datasets import Audio

# dataset config
direction = os.getenv("DIRECTION", "enA-jaA")
sides = {i: n for n, i in enumerate(sorted(direction.split("-")), 1)}
sides_rev = {v: k for k, v in sides.items()}
cache_dir_audio = p_join("download", "audio", direction)
cache_dir_feature = p_join("download", "feature", direction)
os.makedirs(cache_dir_audio, exist_ok=True)
os.makedirs(cache_dir_feature, exist_ok=True)
line_no_start = int(os.getenv("LINE_NO_START", 0))
line_no_end = int(os.getenv("LINE_NO_END", 100000))


def loader(feature: str) -> Dict:
    with open(feature) as f:
        return json.load(f)


files = {
    int(os.path.basename(i).replace(".json", "")): i for i in glob(p_join(cache_dir_feature, "*.json"))
}
audio_loader = Audio()

# remove broken audio files
broken_files = []
for i in tqdm(list(range(line_no_start, line_no_end))):
    if i not in files:
        continue
    i = loader(files[i])
    for lang_side in [sides_rev[1], sides_rev[2]]:
        if f"{lang_side}.path" not in i:
            continue
        audio_file = i[f"{lang_side}.path"]
        start, end = i[f"{lang_side}.duration_start"], i[f"{lang_side}.duration_end"]
        if os.path.exists(audio_file):
            try:
                wav = audio_loader.decode_example({"path": audio_file, "bytes": None})
                if start < end < len(wav["array"]):
                    pass
                else:
                    broken_files.append(audio_file)
            except LibsndfileError:
                broken_files.append(audio_file)
print(f"found {len(broken_files)} broken files:")
if len(broken_files) > 0:
    flag = input("delete the broken files? (y/n): ")
    if flag == "y":
        for audio_file in broken_files:
            # delete broken audio file
            if os.path.exists(audio_file):
                os.remove(audio_file)
            # delete corresponding feature file
            line_no = os.path.basename(audio_file).split(".")[0]
            try:
                feature_file = files[int(line_no)]
                if os.path.exists(feature_file):
                    os.remove(feature_file)
            except Exception as e:
                print(e)