import cv2
import torch

from backend import memory_management
from backend.patcher import clipvision
from backend.patcher.base import ModelPatcher
from modules.modelloader import load_file_from_url
from modules_forge.shared import add_supported_preprocessor, preprocessor_dir
from modules_forge.utils import numpy_to_pytorch, resize_image_with_pad


class PreprocessorParameter:
    def __init__(self, minimum=0.0, maximum=1.0, step=0.01, label="Parameter 1", value=0.5, visible=False, **kwargs):
        self.gradio_update_kwargs = dict(minimum=minimum, maximum=maximum, step=step, label=label, value=value, visible=visible, **kwargs)


class Preprocessor:
    def __init__(self):
        self.name = "PreprocessorBase"
        self.tags = []
        self.model_filename_filters = []
        self.slider_resolution = PreprocessorParameter(label="Resolution", minimum=128, maximum=2048, value=512, step=8, visible=True)
        self.slider_1 = PreprocessorParameter()
        self.slider_2 = PreprocessorParameter()
        self.slider_3 = PreprocessorParameter()
        self.model_patcher: ModelPatcher = None
        self.show_control_mode = True
        self.do_not_need_model = False
        self.sorting_priority = 0  # higher goes to top in the list
        self.corp_image_with_a1111_mask_when_in_img2img_inpaint_tab = True
        self.fill_mask_with_one_when_resize_and_fill = False
        self.use_soft_projection_in_hr_fix = False
        self.expand_mask_when_resize_and_fill = False

    def setup_model_patcher(self, model, load_device=None, offload_device=None, dtype=torch.float32, **kwargs):
        if load_device is None:
            load_device = memory_management.get_torch_device()

        if offload_device is None:
            offload_device = torch.device("cpu")

        if not memory_management.should_use_fp16(load_device):
            dtype = torch.float32

        model.eval()
        model = model.to(device=offload_device, dtype=dtype)

        self.model_patcher = ModelPatcher(model=model, load_device=load_device, offload_device=offload_device, **kwargs)
        self.model_patcher.dtype = dtype
        return self.model_patcher

    def move_all_model_patchers_to_gpu(self):
        memory_management.load_models_gpu([self.model_patcher])
        return

    def send_tensor_to_model_device(self, x):
        return x.to(device=self.model_patcher.current_device, dtype=self.model_patcher.dtype)

    def process_after_running_preprocessors(self, process, params, *args, **kwargs):
        return

    def process_before_every_sampling(self, process, cond, mask, *args, **kwargs):
        return cond, mask

    def process_after_every_sampling(self, process, params, *args, **kwargs):
        return

    def __call__(self, input_image, resolution, slider_1=None, slider_2=None, slider_3=None, input_mask=None, **kwargs):
        return input_image


class PreprocessorNone(Preprocessor):
    def __init__(self):
        super().__init__()
        self.name = "None"
        self.sorting_priority = 10


class PreprocessorCanny(Preprocessor):
    def __init__(self):
        super().__init__()
        self.name = "canny"
        self.tags = ["Canny"]
        self.model_filename_filters = ["canny"]
        self.slider_1 = PreprocessorParameter(minimum=0, maximum=256, step=1, value=100, label="Low Threshold", visible=True)
        self.slider_2 = PreprocessorParameter(minimum=0, maximum=256, step=1, value=200, label="High Threshold", visible=True)
        self.sorting_priority = 100
        self.use_soft_projection_in_hr_fix = True

    def __call__(self, input_image, resolution, slider_1=None, slider_2=None, slider_3=None, **kwargs):
        input_image, remove_pad = resize_image_with_pad(input_image, resolution)
        canny_image = cv2.cvtColor(cv2.Canny(input_image, int(slider_1), int(slider_2)), cv2.COLOR_GRAY2RGB)
        return remove_pad(canny_image)


add_supported_preprocessor(PreprocessorNone())
add_supported_preprocessor(PreprocessorCanny())


class PreprocessorClipVision(Preprocessor):
    global_cache = {}

    def __init__(self, name, url, filename):
        super().__init__()
        self.name = name
        self.url = url
        self.filename = filename
        self.slider_resolution = PreprocessorParameter(visible=False)
        self.corp_image_with_a1111_mask_when_in_img2img_inpaint_tab = False
        self.show_control_mode = False
        self.sorting_priority = 1
        self.clipvision = None

    def load_clipvision(self):
        if self.clipvision is not None:
            return self.clipvision

        ckpt_path = load_file_from_url(url=self.url, model_dir=preprocessor_dir, file_name=self.filename)

        if ckpt_path in PreprocessorClipVision.global_cache:
            self.clipvision = PreprocessorClipVision.global_cache[ckpt_path]
        else:
            self.clipvision = clipvision.load(ckpt_path)
            PreprocessorClipVision.global_cache[ckpt_path] = self.clipvision

        return self.clipvision

    @torch.no_grad()
    def __call__(self, input_image, resolution, slider_1=None, slider_2=None, slider_3=None, **kwargs):
        clipvision = self.load_clipvision()
        return clipvision.encode_image(numpy_to_pytorch(input_image))
