import os
import torch
import json
from io import BytesIO
import torch.distributed as dist
import numpy as np
import kaldiio
import librosa
import torchaudio
import time
import logging
from torch.nn.utils.rnn import pad_sequence
from pydub import AudioSegment

try:
    from funasr.download.file import download_from_url
except:
    print("urllib is not installed, if you infer from url, please install it first.")
import pdb
import subprocess
from subprocess import CalledProcessError, run


def is_ffmpeg_installed():
    try:
        output = subprocess.check_output(["ffmpeg", "-version"], stderr=subprocess.STDOUT)
        return "ffmpeg version" in output.decode("utf-8")
    except (subprocess.CalledProcessError, FileNotFoundError):
        return False


use_ffmpeg = False
if is_ffmpeg_installed():
    use_ffmpeg = True
else:
    print(
        "Notice: ffmpeg is not installed. torchaudio is used to load audio\n"
        "If you want to use ffmpeg backend to load audio, please install it by:"
        "\n\tsudo apt install ffmpeg # ubuntu"
        "\n\t# brew install ffmpeg # mac"
    )


def load_audio_text_image_video(
    data_or_path_or_list,
    fs: int = 16000,
    audio_fs: int = 16000,
    data_type="sound",
    tokenizer=None,
    **kwargs,
):
    if isinstance(data_or_path_or_list, (list, tuple)):
        if data_type is not None and isinstance(data_type, (list, tuple)):
            data_types = [data_type] * len(data_or_path_or_list)
            data_or_path_or_list_ret = [[] for d in data_type]
            for i, (data_type_i, data_or_path_or_list_i) in enumerate(
                zip(data_types, data_or_path_or_list)
            ):
                for j, (data_type_j, data_or_path_or_list_j) in enumerate(
                    zip(data_type_i, data_or_path_or_list_i)
                ):
                    data_or_path_or_list_j = load_audio_text_image_video(
                        data_or_path_or_list_j,
                        fs=fs,
                        audio_fs=audio_fs,
                        data_type=data_type_j,
                        tokenizer=tokenizer,
                        **kwargs,
                    )
                    data_or_path_or_list_ret[j].append(data_or_path_or_list_j)

            return data_or_path_or_list_ret
        else:
            return [
                load_audio_text_image_video(
                    audio, fs=fs, audio_fs=audio_fs, data_type=data_type, **kwargs
                )
                for audio in data_or_path_or_list
            ]
    if isinstance(data_or_path_or_list, str) and data_or_path_or_list.startswith(
        ("http://", "https://")
    ):  # download url to local file
        data_or_path_or_list = download_from_url(data_or_path_or_list)

    if isinstance(data_or_path_or_list, str) and os.path.exists(data_or_path_or_list):  # local file
        if data_type is None or data_type == "sound":
            # if use_ffmpeg:
            #     data_or_path_or_list = _load_audio_ffmpeg(data_or_path_or_list, sr=fs)
            #     data_or_path_or_list = torch.from_numpy(data_or_path_or_list).squeeze()  # [n_samples,]
            # else:
            #     data_or_path_or_list, audio_fs = torchaudio.load(data_or_path_or_list)
            #     if kwargs.get("reduce_channels", True):
            #         data_or_path_or_list = data_or_path_or_list.mean(0)
            try:
                data_or_path_or_list, audio_fs = torchaudio.load(data_or_path_or_list)
                if kwargs.get("reduce_channels", True):
                    data_or_path_or_list = data_or_path_or_list.mean(0)
            except:
                data_or_path_or_list = _load_audio_ffmpeg(data_or_path_or_list, sr=fs)
                data_or_path_or_list = torch.from_numpy(
                    data_or_path_or_list
                ).squeeze()  # [n_samples,]
        elif data_type == "text" and tokenizer is not None:
            data_or_path_or_list = tokenizer.encode(data_or_path_or_list)
        elif data_type == "image":  # undo
            pass
        elif data_type == "video":  # undo
            pass

        # if data_in is a file or url, set is_final=True
        if "cache" in kwargs:
            kwargs["cache"]["is_final"] = True
            kwargs["cache"]["is_streaming_input"] = False
    elif isinstance(data_or_path_or_list, str) and data_type == "text" and tokenizer is not None:
        data_or_path_or_list = tokenizer.encode(data_or_path_or_list)
    elif isinstance(data_or_path_or_list, np.ndarray):  # audio sample point
        data_or_path_or_list = torch.from_numpy(data_or_path_or_list)  # .squeeze()  # [n_samples,]
    elif isinstance(data_or_path_or_list, str) and data_type == "kaldi_ark":
        data_mat = kaldiio.load_mat(data_or_path_or_list)
        if isinstance(data_mat, tuple):
            audio_fs, mat = data_mat
        else:
            mat = data_mat
        if mat.dtype == "int16" or mat.dtype == "int32":
            mat = mat.astype(np.float64)
            mat = mat / 32768
        if mat.ndim == 2:
            mat = mat[:, 0]
        data_or_path_or_list = mat
    else:
        pass
        # print(f"unsupport data type: {data_or_path_or_list}, return raw data")

    if audio_fs != fs and data_type != "text":
        resampler = torchaudio.transforms.Resample(audio_fs, fs)
        data_or_path_or_list = resampler(data_or_path_or_list[None, :])[0, :]
    return data_or_path_or_list


def load_bytes(input):
    input = validate_frame_rate(input)
    middle_data = np.frombuffer(input, dtype=np.int16)
    middle_data = np.asarray(middle_data)
    if middle_data.dtype.kind not in "iu":
        raise TypeError("'middle_data' must be an array of integers")
    dtype = np.dtype("float32")
    if dtype.kind != "f":
        raise TypeError("'dtype' must be a floating point type")

    i = np.iinfo(middle_data.dtype)
    abs_max = 2 ** (i.bits - 1)
    offset = i.min + abs_max
    array = np.frombuffer((middle_data.astype(dtype) - offset) / abs_max, dtype=np.float32)
    return array

def validate_frame_rate(
    input,
    fs: int = 16000,
):
    
    # 将文件读取为字节流
    byte_data = BytesIO(input)

    # 使用 pydub 加载音频
    audio = AudioSegment.from_file(byte_data)

    # 确保采样率为 16000 Hz
    if audio.frame_rate != fs:
        audio = audio.set_frame_rate(fs)

        # 将重新采样后的音频导出为字节流
        output = BytesIO()
        audio.export(output, format="wav")
        output.seek(0)

        # 获取重新采样后的字节流数据
        input = output.read()
        
    return input


def extract_fbank(data, data_len=None, data_type: str = "sound", frontend=None, **kwargs):
    if isinstance(data, np.ndarray):
        data = torch.from_numpy(data)
        if len(data.shape) < 2:
            data = data[None, :]  # data: [batch, N]
        data_len = [data.shape[1]] if data_len is None else data_len
    elif isinstance(data, torch.Tensor):
        if len(data.shape) < 2:
            data = data[None, :]  # data: [batch, N]
        data_len = [data.shape[1]] if data_len is None else data_len
    elif isinstance(data, (list, tuple)):
        data_list, data_len = [], []
        for data_i in data:
            if isinstance(data_i, np.ndarray):
                data_i = torch.from_numpy(data_i)
            data_list.append(data_i)
            data_len.append(data_i.shape[0])
        data = pad_sequence(data_list, batch_first=True)  # data: [batch, N]

    data, data_len = frontend(data, data_len, **kwargs)

    if isinstance(data_len, (list, tuple)):
        data_len = torch.tensor([data_len])
    return data.to(torch.float32), data_len.to(torch.int32)


def _load_audio_ffmpeg(file: str, sr: int = 16000):
    """
    Open an audio file and read as mono waveform, resampling as necessary

    Parameters
    ----------
    file: str
        The audio file to open

    sr: int
        The sample rate to resample the audio if necessary

    Returns
    -------
    A NumPy array containing the audio waveform, in float32 dtype.
    """

    # This launches a subprocess to decode audio while down-mixing
    # and resampling as necessary.  Requires the ffmpeg CLI in PATH.
    # fmt: off
    cmd = [
        "ffmpeg",
        "-nostdin",
        "-threads", "0",
        "-i", file,
        "-f", "s16le",
        "-ac", "1",
        "-acodec", "pcm_s16le",
        "-ar", str(sr),
        "-"
    ]
    # fmt: on
    try:
        out = run(cmd, capture_output=True, check=True).stdout
    except CalledProcessError as e:
        raise RuntimeError(f"Failed to load audio: {e.stderr.decode()}") from e

    return np.frombuffer(out, np.int16).flatten().astype(np.float32) / 32768.0
