import os
import sys
import glob
import torch

import numpy as np
import soundfile as sf
import matplotlib.pyplot as plt

from collections import OrderedDict

sys.path.append(os.getcwd())

from main.app.variables import translations

MATPLOTLIB_FLAG = False

def replace_keys_in_dict(d, old_key_part, new_key_part):
    updated_dict = OrderedDict() if isinstance(d, OrderedDict) else {}

    for key, value in d.items():
        updated_dict[(key.replace(old_key_part, new_key_part) if isinstance(key, str) else key)] = (replace_keys_in_dict(value, old_key_part, new_key_part) if isinstance(value, dict) else value)
    
    return updated_dict

def load_checkpoint(logger, checkpoint_path, model, optimizer=None, load_opt=1):
    assert os.path.isfile(checkpoint_path), translations["not_found_checkpoint"].format(checkpoint_path=checkpoint_path)

    checkpoint_dict = replace_keys_in_dict(replace_keys_in_dict(torch.load(checkpoint_path, map_location="cpu", weights_only=True), ".weight_v", ".parametrizations.weight.original1"), ".weight_g", ".parametrizations.weight.original0")
    new_state_dict = {k: checkpoint_dict["model"].get(k, v) for k, v in (model.module.state_dict() if hasattr(model, "module") else model.state_dict()).items()}
    model.module.load_state_dict(new_state_dict, strict=False) if hasattr(model, "module") else model.load_state_dict(new_state_dict, strict=False)

    if optimizer and load_opt == 1: optimizer.load_state_dict(checkpoint_dict.get("optimizer", {}))
    logger.debug(translations["save_checkpoint"].format(checkpoint_path=checkpoint_path, checkpoint_dict=checkpoint_dict['iteration']))

    return (model, optimizer, checkpoint_dict.get("learning_rate", 0), checkpoint_dict["iteration"])

def save_checkpoint(logger, model, optimizer, learning_rate, iteration, checkpoint_path):
    state_dict = (model.module.state_dict() if hasattr(model, "module") else model.state_dict())
    torch.save(replace_keys_in_dict(replace_keys_in_dict({"model": state_dict, "iteration": iteration, "optimizer": optimizer.state_dict(), "learning_rate": learning_rate}, ".parametrizations.weight.original1", ".weight_v"), ".parametrizations.weight.original0", ".weight_g"), checkpoint_path)
    logger.info(translations["save_model"].format(checkpoint_path=checkpoint_path, iteration=iteration))

def summarize(writer, global_step, scalars={}, histograms={}, images={}, audios={}, audio_sample_rate=22050):
    for k, v in scalars.items():
        writer.add_scalar(k, v, global_step)

    for k, v in histograms.items():
        writer.add_histogram(k, v, global_step)

    for k, v in images.items():
        writer.add_image(k, v, global_step, dataformats="HWC")

    for k, v in audios.items():
        writer.add_audio(k, v, global_step, audio_sample_rate)

def latest_checkpoint_path(dir_path, regex="G_*.pth"):
    checkpoints = sorted(glob.glob(os.path.join(dir_path, regex)), key=lambda f: int("".join(filter(str.isdigit, f))))
    return checkpoints[-1] if checkpoints else None

def plot_spectrogram_to_numpy(spectrogram):
    global MATPLOTLIB_FLAG

    if not MATPLOTLIB_FLAG:
        plt.switch_backend("Agg")
        MATPLOTLIB_FLAG = True

    fig, ax = plt.subplots(figsize=(10, 2))
    plt.colorbar(ax.imshow(spectrogram, aspect="auto", origin="lower", interpolation="none"), ax=ax)
    plt.xlabel("Frames")
    plt.ylabel("Channels")
    plt.tight_layout()
    fig.canvas.draw()
    plt.close(fig)

    try:
        data = np.array(fig.canvas.renderer.buffer_rgba(), dtype=np.uint8).reshape(fig.canvas.get_width_height()[::-1] + (4,))[:, :, :3]
    except:
        data = np.fromstring(fig.canvas.tostring_rgb(), dtype=np.uint8, sep="").reshape(fig.canvas.get_width_height()[::-1] + (3,))

    return data

def load_wav_to_torch(full_path):
    data, sample_rate = sf.read(full_path, dtype=np.float32)
    return torch.FloatTensor(data.astype(np.float32)), sample_rate

def load_filepaths_and_text(filename, split="|"):
    with open(filename, encoding="utf-8") as f:
        return [line.strip().split(split) for line in f]
    
class HParams:
    def __init__(self, **kwargs):
        for k, v in kwargs.items():
            self[k] = HParams(**v) if isinstance(v, dict) else v

    def keys(self):
        return self.__dict__.keys()
    
    def items(self):
        return self.__dict__.items()
    
    def values(self):
        return self.__dict__.values()
    
    def __len__(self):
        return len(self.__dict__)
    
    def __getitem__(self, key):
        return self.__dict__[key]

    def __setitem__(self, key, value):
        self.__dict__[key] = value

    def __contains__(self, key):
        return key in self.__dict__
    
    def __repr__(self):
        return repr(self.__dict__)