import numpy as np
import torch
from torch import nn as nn
from torchvision.ops.misc import FrozenBatchNorm2d
import logging
import h5py
from tqdm import tqdm
import random
import json
import os
import pathlib

# TODO: (yusong) this not a good place to store those information and does not scale. Need to be fixed later.
dataset_split = {
    "audiocaps": ["train", "valid", "test"],
    "audioset": ["balanced_train", "unbalanced_train", "eval"],
    "BBCSoundEffects": ["train", "test"],
    "Clotho": ["train", "test", "valid"],
    "free_to_use_sounds": ["train", "test"],
    "paramount_motion": ["train", "test"],
    "sonniss_game_effects": ["train", "test"],
    "wesoundeffects": ["train", "test"],
    "MACS": ["train", "test"],
    "freesound": ["train", "test"],
    "FSD50K": ["train", "test", "valid"],
    "fsd50k_class_label": ["train", "test", "valid"],
    "esc50": ["train", "test"],
    "audiostock": ["train", "test"],
    "freesound_no_overlap_noesc50": ["train", "test"],
    "epidemic_sound_effects": ["train", "test"],
    "VGGSound": ["train", "test"],
    "urbansound8k_class_label": ["train", "test"],
    "audioset_t5": ["balanced_train", "unbalanced_train", "eval"],
    "epidemic_sound_effects_t5": ["train", "test"],
    "WavText5K": ["train", "test"],
    "esc50_no_overlap": ["train", "test"],
    "usd8k_no_overlap": ["train", "test"],
    "fsd50k_200_class_label": ["train", "test", "valid"]
}


def freeze_batch_norm_2d(module, module_match={}, name=""):
    """
    Converts all `BatchNorm2d` and `SyncBatchNorm` layers of provided module into `FrozenBatchNorm2d`. If `module` is
    itself an instance of either `BatchNorm2d` or `SyncBatchNorm`, it is converted into `FrozenBatchNorm2d` and
    returned. Otherwise, the module is walked recursively and submodules are converted in place.

    Args:
        module (torch.nn.Module): Any PyTorch module.
        module_match (dict): Dictionary of full module names to freeze (all if empty)
        name (str): Full module name (prefix)

    Returns:
        torch.nn.Module: Resulting module

    Inspired by https://github.com/pytorch/pytorch/blob/a5895f85be0f10212791145bfedc0261d364f103/torch/nn/modules/batchnorm.py#L762
    """
    res = module
    is_match = True
    if module_match:
        is_match = name in module_match
    if is_match and isinstance(
            module, (nn.modules.batchnorm.BatchNorm2d, nn.modules.batchnorm.SyncBatchNorm)
    ):
        res = FrozenBatchNorm2d(module.num_features)
        res.num_features = module.num_features
        res.affine = module.affine
        if module.affine:
            res.weight.data = module.weight.data.clone().detach()
            res.bias.data = module.bias.data.clone().detach()
        res.running_mean.data = module.running_mean.data
        res.running_var.data = module.running_var.data
        res.eps = module.eps
    else:
        for child_name, child in module.named_children():
            full_child_name = ".".join([name, child_name]) if name else child_name
            new_child = freeze_batch_norm_2d(child, module_match, full_child_name)
            if new_child is not child:
                res.add_module(child_name, new_child)
    return res


def exist(dataset_name, dataset_type):
    """
    Check if dataset exists
    """
    if dataset_type in dataset_split[dataset_name]:
        return True
    else:
        return False


def get_tar_path_from_dataset_name(
        dataset_names,
        dataset_types,
        islocal,
        dataset_path,
        proportion=1,
        full_dataset=None
):
    """
    Get tar path from dataset name and type
    """
    output = []
    for n in dataset_names:
        if full_dataset is not None and n in full_dataset:
            current_dataset_types = dataset_split[n]
        else:
            current_dataset_types = dataset_types
        for s in current_dataset_types:
            tmp = []
            if islocal:
                sizefilepath_ = f"{dataset_path}/{n}/{s}/sizes.json"
                if not os.path.exists(sizefilepath_):
                    sizefilepath_ = f"./json_files/{n}/{s}/sizes.json"
            else:
                sizefilepath_ = f"./json_files/{n}/{s}/sizes.json"
            if not os.path.exists(sizefilepath_):
                continue
            sizes = json.load(open(sizefilepath_, "r"))
            for k in sizes.keys():
                if islocal:
                    tmp.append(f"{dataset_path}/{n}/{s}/{k}")
                else:
                    tmp.append(
                        f"pipe:aws s3 --cli-connect-timeout 0 cp s3://s-laion-audio/webdataset_tar/{n}/{s}/{k} -"
                    )
            if proportion != 1:
                tmp = random.sample(tmp, int(proportion * len(tmp)))
            output.append(tmp)
    return sum(output, [])


def get_tar_path_from_txts(txt_path, islocal, proportion=1):
    """
    Get tar path from txt path
    """
    if isinstance(txt_path, (list, tuple)):
        return sum(
            [
                get_tar_path_from_txts(
                    txt_path[i], islocal=islocal, proportion=proportion
                )
                for i in range(len(txt_path))
            ],
            [],
        )
    if isinstance(txt_path, str):
        with open(txt_path) as f:
            lines = f.readlines()
        if islocal:
            lines = [
                lines[i]
                .split("\n")[0]
                .replace("pipe:aws s3 cp s3://s-laion-audio/", "/mnt/audio_clip/")
                for i in range(len(lines))
            ]
        else:
            lines = [
                lines[i].split("\n")[0].replace(".tar", ".tar -")
                for i in range(len(lines))
            ]
        if proportion != 1:
            print("Sampling tars with proportion of {}".format(proportion))
            lines = random.sample(lines, int(proportion * len(lines)))
        return lines


def get_mix_lambda(mixup_alpha, batch_size):
    mixup_lambdas = [
        np.random.beta(mixup_alpha, mixup_alpha, 1)[0] for _ in range(batch_size)
    ]
    return np.array(mixup_lambdas).astype(np.float32)


def do_mixup(x, mixup_lambda):
    """
    Args:
      x: (batch_size , ...)
      mixup_lambda: (batch_size,)
    Returns:
      out: (batch_size, ...)
    """
    out = (
            x.transpose(0, -1) * mixup_lambda
            + torch.flip(x, dims=[0]).transpose(0, -1) * (1 - mixup_lambda)
    ).transpose(0, -1)
    return out


def interpolate(x, ratio):
    """Interpolate data in time domain. This is used to compensate the
    resolution reduction in downsampling of a CNN.

    Args:
      x: (batch_size, time_steps, classes_num)
      ratio: int, ratio to interpolate
    Returns:
      upsampled: (batch_size, time_steps * ratio, classes_num)
    """
    (batch_size, time_steps, classes_num) = x.shape
    upsampled = x[:, :, None, :].repeat(1, 1, ratio, 1)
    upsampled = upsampled.reshape(batch_size, time_steps * ratio, classes_num)
    return upsampled


def pad_framewise_output(framewise_output, frames_num):
    """Pad framewise_output to the same length as input frames. The pad value
    is the same as the value of the last frame.
    Args:
      framewise_output: (batch_size, frames_num, classes_num)
      frames_num: int, number of frames to pad
    Outputs:
      output: (batch_size, frames_num, classes_num)
    """
    pad = framewise_output[:, -1:, :].repeat(
        1, frames_num - framewise_output.shape[1], 1
    )
    """tensor for padding"""

    output = torch.cat((framewise_output, pad), dim=1)
    """(batch_size, frames_num, classes_num)"""


def process_ipc(index_path, classes_num, filename):
    # load data
    logging.info("Load Data...............")
    ipc = [[] for _ in range(classes_num)]
    with h5py.File(index_path, "r") as f:
        for i in tqdm(range(len(f["target"]))):
            t_class = np.where(f["target"][i])[0]
            for t in t_class:
                ipc[t].append(i)
    print(ipc)
    np.save(filename, ipc)
    logging.info("Load Data Succeed...............")


def save_to_dict(s, o_={}):
    sp = s.split(": ")
    o_.update({sp[0]: float(sp[1])})
    return o_


def get_data_from_log(txt_path):
    """
    Output dictionary from out.txt log file
    """
    with open(txt_path) as f:
        lines = f.readlines()
    val_data = {}
    train_data = {}
    train_losses = []
    train_losses_epoch = []
    for i in range(len(lines)):
        if "| INFO |" in lines[i]:
            if "Eval Epoch" in lines[i]:
                if "val_loss" in lines[i]:
                    # float(regex.sub("", lines[310].split("	")[-1]).replace(" ", ""))
                    line = lines[i].split("Eval Epoch: ")[-1]
                    num_epoch = int(line.split("	")[0].split(" ")[0])
                    d = {
                        line.split("	")[0]
                        .split(" ")[1]
                        .replace(":", ""): float(line.split("	")[0].split(" ")[-1])
                    }
                    for i in range(1, len(line.split("	"))):
                        d = save_to_dict(line.split("	")[i], d)
                    val_data[num_epoch] = d
            elif "Train Epoch" in lines[i]:
                num_epoch = int(lines[i].split("Train Epoch: ")[1][0])
                loss = float(lines[i].split("Loss: ")[-1].split(" (")[0])
                train_losses.append(loss)
                train_losses_epoch.append(num_epoch)
    for i in range(len(train_losses)):
        train_data[i] = {
            "num_epoch": train_losses_epoch[i],
            "train_loss": train_losses[i],
        }
    return train_data, val_data


def save_p(obj, filename):
    import pickle

    try:
        from deepdiff import DeepDiff
    except:
        os.system("pip install deepdiff")
        from deepdiff import DeepDiff
    with open(filename, "wb") as file:
        pickle.dump(obj, file, protocol=pickle.HIGHEST_PROTOCOL)  # highest protocol
    with open(filename, "rb") as file:
        z = pickle.load(file)
    assert (
            DeepDiff(obj, z, ignore_string_case=True) == {}
    ), "there is something wrong with the saving process"
    return


def load_p(filename):
    import pickle

    with open(filename, "rb") as file:
        z = pickle.load(file)
    return z


def save_json(data, name="data.json"):
    import json
    with open(name, 'w') as fp:
        json.dump(data, fp)
    return


def load_json(name):
    import json
    with open(name, 'r') as fp:
        data = json.load(fp)
    return data


from multiprocessing import Process, Manager
from multiprocessing import Process, Value, Array
from ctypes import c_wchar


def load_class_label(path):
    # https://stackoverflow.com/questions/48004243/how-to-share-large-read-only-dictionary-list-across-processes-in-multiprocessing
    # https://stackoverflow.com/questions/45693949/storing-strings-in-a-multiprocessing-sharedctypes-array
    out = None
    if path is not None:
        if pathlib.Path(path).suffix in [".pkl", ".pickle"]:
            out = load_p(path)
        elif pathlib.Path(path).suffix in [".json", ".txt"]:
            out = load_json(path)
        elif pathlib.Path(path).suffix in [".npy", ".npz"]:
            out = np.load(path)
        elif pathlib.Path(path).suffix in [".csv"]:
            import pandas as pd
            out = pd.read_csv(path)
    return out
    # if out is None:
    #     return None
    # else:
    #     key = Array(c_wchar, '\n'.join(list(out.keys())), lock=False)
    #     val = Array('i', out.values(), lock=False)
    #     return (key, val)


from torch import optim


def get_optimizer(params, lr, betas, eps, momentum, optimizer_name):
    if optimizer_name.lower() == "adamw":
        optimizer = optim.AdamW(
            params, lr=lr, betas=betas, eps=eps
        )
    elif optimizer_name.lower() == "sgd":
        optimizer = optim.SGD(
            params, lr=lr, momentum=momentum
        )
    elif optimizer_name.lower() == "adam":
        optimizer = optim.Adam(
            params, lr=lr, betas=betas, eps=eps
        )
    else:
        raise ValueError("optimizer name is not correct")
    return optimizer
