# coding: utf-8

"""
utility functions and classes to handle feature extraction and model loading
"""

import os
import os.path as osp
import cv2
import torch
import yaml
import argparse
import locale
import numpy as np
from PIL import Image
from rich.console import Console
from collections import OrderedDict

from ..live_portrait.spade_generator import SPADEDecoder
from ..live_portrait.warping_network import WarpingNetwork
from ..live_portrait.motion_extractor import MotionExtractor
from ..live_portrait.appearance_feature_extractor import AppearanceFeatureExtractor
from ..live_portrait.stitching_retargeting_network import StitchingRetargetingNetwork
from .rprint import rlog as log


def suffix(filename):
    """a.jpg -> jpg"""
    pos = filename.rfind(".")
    if pos == -1:
        return ""
    return filename[pos + 1:]


def prefix(filename):
    """a.jpg -> a"""
    pos = filename.rfind(".")
    if pos == -1:
        return filename
    return filename[:pos]


def basename(filename):
    """a/b/c.jpg -> c"""
    return prefix(osp.basename(filename))


def is_video(file_path):
    if file_path.lower().endswith((".mp4", ".mov", ".avi", ".webm")) or osp.isdir(file_path):
        return True
    return False

def is_template(file_path):
    if file_path.endswith(".pkl"):
        return True
    return False


def mkdir(d, log=False):
    # return self-assined `d`, for one line code
    if not osp.exists(d):
        os.makedirs(d, exist_ok=True)
        if log:
            print(f"Make dir: {d}")
    return d


def squeeze_tensor_to_numpy(tensor):
    out = tensor.data.squeeze(0).cpu().numpy()
    return out


def dct2cuda(dct: dict, device_id: int):
    for key in dct:
        dct[key] = torch.tensor(dct[key]).cuda(device_id)
    return dct


def concat_feat(kp_source: torch.Tensor, kp_driving: torch.Tensor) -> torch.Tensor:
    """
    kp_source: (bs, k, 3)
    kp_driving: (bs, k, 3)
    Return: (bs, 2k*3)
    """
    bs_src = kp_source.shape[0]
    bs_dri = kp_driving.shape[0]
    assert bs_src == bs_dri, 'batch size must be equal'

    feat = torch.cat([kp_source.view(bs_src, -1), kp_driving.view(bs_dri, -1)], dim=1)
    return feat


# get coefficients of Eqn. 7
def calculate_transformation(config, s_kp_info, t_0_kp_info, t_i_kp_info, R_s, R_t_0, R_t_i):
    if config.relative:
        new_rotation = (R_t_i @ R_t_0.permute(0, 2, 1)) @ R_s
        new_expression = s_kp_info['exp'] + (t_i_kp_info['exp'] - t_0_kp_info['exp'])
    else:
        new_rotation = R_t_i
        new_expression = t_i_kp_info['exp']
    new_translation = s_kp_info['t'] + (t_i_kp_info['t'] - t_0_kp_info['t'])
    new_translation[..., 2].fill_(0)  # Keep the z-axis unchanged
    new_scale = s_kp_info['scale'] * (t_i_kp_info['scale'] / t_0_kp_info['scale'])
    return new_rotation, new_expression, new_translation, new_scale

def load_description(fp):
    with open(fp, 'r', encoding='utf-8') as f:
        content = f.read()
    return content


def resize_to_limit(img, max_dim=1280, n=2):
    h, w = img.shape[:2]
    if max_dim > 0 and max(h, w) > max_dim:
        if h > w:
            new_h = max_dim
            new_w = int(w * (max_dim / h))
        else:
            new_w = max_dim
            new_h = int(h * (max_dim / w))
        img = cv2.resize(img, (new_w, new_h))
    n = max(n, 1)
    new_h = img.shape[0] - (img.shape[0] % n)
    new_w = img.shape[1] - (img.shape[1] % n)
    if new_h == 0 or new_w == 0:
        return img
    if new_h != img.shape[0] or new_w != img.shape[1]:
        img = img[:new_h, :new_w]
    return img


def load_yaml(file_path):
    encoding = locale.getpreferredencoding(False)
    with open(file_path, 'r', encoding=encoding) as file:
        data = yaml.safe_load(file)
    return data


def str2bool(v):
    if isinstance(v, bool):
        return v
    if v.lower() in ('yes', 'true', 't', 'y', '1'):
        return True
    elif v.lower() in ('no', 'false', 'f', 'n', '0'):
        return False
    else:
        raise argparse.ArgumentTypeError('Boolean value expected.')