import os
import random

import cv2
import numpy as np
from pathlib import Path
import warnings
from huggingface_hub import hf_hub_download

here = Path(__file__).parent.resolve()

def HWC3(x):
    assert x.dtype == np.uint8
    if x.ndim == 2:
        x = x[:, :, None]
    assert x.ndim == 3
    H, W, C = x.shape
    assert C == 1 or C == 3 or C == 4
    if C == 3:
        return x
    if C == 1:
        return np.concatenate([x, x, x], axis=2)
    if C == 4:
        color = x[:, :, 0:3].astype(np.float32)
        alpha = x[:, :, 3:4].astype(np.float32) / 255.0
        y = color * alpha + 255.0 * (1.0 - alpha)
        y = y.clip(0, 255).astype(np.uint8)
        return y


def make_noise_disk(H, W, C, F):
    noise = np.random.uniform(low=0, high=1, size=((H // F) + 2, (W // F) + 2, C))
    noise = cv2.resize(noise, (W + 2 * F, H + 2 * F), interpolation=cv2.INTER_CUBIC)
    noise = noise[F: F + H, F: F + W]
    noise -= np.min(noise)
    noise /= np.max(noise)
    if C == 1:
        noise = noise[:, :, None]
    return noise


def nms(x, t, s):
    x = cv2.GaussianBlur(x.astype(np.float32), (0, 0), s)

    f1 = np.array([[0, 0, 0], [1, 1, 1], [0, 0, 0]], dtype=np.uint8)
    f2 = np.array([[0, 1, 0], [0, 1, 0], [0, 1, 0]], dtype=np.uint8)
    f3 = np.array([[1, 0, 0], [0, 1, 0], [0, 0, 1]], dtype=np.uint8)
    f4 = np.array([[0, 0, 1], [0, 1, 0], [1, 0, 0]], dtype=np.uint8)

    y = np.zeros_like(x)

    for f in [f1, f2, f3, f4]:
        np.putmask(y, cv2.dilate(x, kernel=f) == x, x)

    z = np.zeros_like(y, dtype=np.uint8)
    z[y > t] = 255
    return z

def min_max_norm(x):
    x -= np.min(x)
    x /= np.maximum(np.max(x), 1e-5)
    return x


def safe_step(x, step=2):
    y = x.astype(np.float32) * float(step + 1)
    y = y.astype(np.int32).astype(np.float32) / float(step)
    return y


def img2mask(img, H, W, low=10, high=90):
    assert img.ndim == 3 or img.ndim == 2
    assert img.dtype == np.uint8

    if img.ndim == 3:
        y = img[:, :, random.randrange(0, img.shape[2])]
    else:
        y = img

    y = cv2.resize(y, (W, H), interpolation=cv2.INTER_CUBIC)

    if random.uniform(0, 1) < 0.5:
        y = 255 - y

    return y < np.percentile(y, random.randrange(low, high))

def safer_memory(x):
    # Fix many MAC/AMD problems
    return np.ascontiguousarray(x.copy()).copy()

UPSCALE_METHODS = ["INTER_NEAREST", "INTER_LINEAR", "INTER_AREA", "INTER_CUBIC", "INTER_LANCZOS4"]
def get_upscale_method(method_str):
    assert method_str in UPSCALE_METHODS, f"Method {method_str} not found in {UPSCALE_METHODS}"
    return getattr(cv2, method_str)

def pad64(x):
    return int(np.ceil(float(x) / 64.0) * 64 - x)

#https://github.com/Mikubill/sd-webui-controlnet/blob/main/scripts/processor.py#L17
#Added upscale_method param
def resize_image_with_pad(input_image, resolution, upscale_method = "", skip_hwc3=False):
    if skip_hwc3:
        img = input_image
    else:
        img = HWC3(input_image)
    H_raw, W_raw, _ = img.shape
    k = float(resolution) / float(min(H_raw, W_raw))
    H_target = int(np.round(float(H_raw) * k))
    W_target = int(np.round(float(W_raw) * k))
    img = cv2.resize(img, (W_target, H_target), interpolation=get_upscale_method(upscale_method) if k > 1 else cv2.INTER_AREA)
    H_pad, W_pad = pad64(H_target), pad64(W_target)
    img_padded = np.pad(img, [[0, H_pad], [0, W_pad], [0, 0]], mode='edge')

    def remove_pad(x):
        return safer_memory(x[:H_target, :W_target, ...])

    return safer_memory(img_padded), remove_pad
    
def common_input_validate(input_image, output_type, **kwargs):
    if "img" in kwargs:
            warnings.warn("img is deprecated, please use `input_image=...` instead.", DeprecationWarning)
            input_image = kwargs.pop("img")
    
    if "return_pil" in kwargs:
            warnings.warn("return_pil is deprecated. Use output_type instead.", DeprecationWarning)
            output_type = "pil" if kwargs["return_pil"] else "np"
    
    if type(output_type) is bool:
        warnings.warn("Passing `True` or `False` to `output_type` is deprecated and will raise an error in future versions")
        if output_type:
            output_type = "pil"

    if input_image is None:
        raise ValueError("input_image must be defined.")

    if not isinstance(input_image, np.ndarray):
        input_image = np.array(input_image, dtype=np.uint8)
        output_type = output_type or "pil"
    else:
        output_type = output_type or "np"
    
    return (input_image, output_type)

def custom_hf_download(pretrained_model_or_path, filename, cache_dir, subfolder='', use_symlinks=False):
    local_dir = os.path.join(cache_dir, pretrained_model_or_path)
    model_path = os.path.join(local_dir, *subfolder.split('/'), filename)
    
    if not os.path.exists(model_path):
        print(f"Failed to find {model_path}.\n Downloading from huggingface.co")
        if use_symlinks:
            cache_dir_d = os.getenv("HUGGINGFACE_HUB_CACHE")
            if cache_dir_d is None:
                import platform
                if platform.system() == "Windows":
                    cache_dir_d = os.path.join(os.getenv("USERPROFILE"), ".cache", "huggingface", "hub")
                else:
                    cache_dir_d = os.path.join(os.getenv("HOME"), ".cache", "huggingface", "hub")
            try:
                # test_link
                if not os.path.exists(cache_dir_d):
                    os.makedirs(cache_dir_d)
                open(os.path.join(cache_dir_d, f"linktest_{filename}.txt"), "w")
                os.link(os.path.join(cache_dir_d, f"linktest_{filename}.txt"), os.path.join(cache_dir, f"linktest_{filename}.txt"))
                os.remove(os.path.join(cache_dir, f"linktest_{filename}.txt"))
                os.remove(os.path.join(cache_dir_d, f"linktest_{filename}.txt"))
                print("Using symlinks to download models. \n",\
                      "Make sure you have enough space on your cache folder. \n",\
                      "And do not purge the cache folder after downloading.\n",\
                      "Otherwise, you will have to re-download the models every time you run the script.\n",\
                      "You can use USE_SYMLINKS: False in config.yaml to avoid this behavior.")
            except:
                print("Maybe not able to create symlink. Disable using symlinks.")
                use_symlinks = False
                cache_dir_d = os.path.join(cache_dir, pretrained_model_or_path, "cache")
        else:
            cache_dir_d = os.path.join(cache_dir, pretrained_model_or_path, "cache")

        model_path = hf_hub_download(repo_id=pretrained_model_or_path,
            cache_dir=cache_dir_d,
            local_dir=local_dir,
            subfolder=subfolder,
            filename=filename,
            local_dir_use_symlinks=use_symlinks,
            resume_download=True,
            etag_timeout=100
        )
        if not use_symlinks:
            try:
                import shutil
                shutil.rmtree(cache_dir_d)
            except Exception as e :
                print(e)
    return model_path