# -*- coding: utf-8 -*-
import json
import wave
from pathlib import Path

import numpy as np
import pandas as pd


ROOT = Path(__file__).resolve().parent.parent
CONVERT_TASKS = {"GWOSC", "LEAVES", "Iquique", "Llaima", "RadSeg", "RadioML"}


def main():
    total = converted = 0

    with (ROOT / "meta_data.jsonl").open("r", encoding="utf-8") as fin, \
         (ROOT / "wav_data.jsonl").open("w", encoding="utf-8") as fout:
        for line in fin:
            if not line.strip():
                continue
            data = json.loads(line)

            if data["task_name"] in CONVERT_TASKS:
                data_type = data["data_type"]
                assert data_type in ("csv", "npy")

                src_rel = Path(data["input_ts"]["path"])
                src_path = ROOT / src_rel
                assert src_rel.parent.name == "raw_input" and src_path.is_file()

                if data_type == "csv":
                    signal = pd.read_csv(src_path, header=None).values
                else:
                    signal = np.load(src_path)

                signal = signal.flatten().astype(np.float64)
                assert signal.size > 0
                abs_max = np.max(np.abs(signal))
                if abs_max > 0:
                    signal = signal / abs_max
                signal = (signal * 32767).astype(np.int16)

                wav_rel = src_rel.parent.parent / "wav_input" / (src_rel.stem + ".wav")
                wav_path = ROOT / wav_rel
                wav_path.parent.mkdir(parents=True, exist_ok=True)

                with wave.open(str(wav_path), "wb") as wf:
                    wf.setnchannels(1)
                    wf.setsampwidth(2)
                    wf.setframerate(16000)
                    wf.writeframes(signal.tobytes())

                data["data_type"] = "wav"
                data["input_ts"]["path"] = wav_rel.as_posix()
                data["input_ts"]["length"] = int(signal.size)
                data["input_ts"]["num_channel"] = 1
                data["input_ts"]["fs"] = 16000

                if data["task_name"] in ("Iquique", "RadSeg", "RadioML"):
                    data["input_ts"]["channel_detail"] = []

                converted += 1

            fout.write(json.dumps(data, ensure_ascii=False) + "\n")
            total += 1

    assert total == 6128 and converted == 3428
    print(f"Done: {converted} WAV files, {total} JSONL records")


if __name__ == "__main__":
    main()