from typing_extensions import override
import numpy as np
import torch
import torch.nn.functional as F
from PIL import Image
import math
from enum import Enum
from typing import TypedDict, Literal

import comfy.utils
import comfy.model_management
import node_helpers
from comfy_api.latest import ComfyExtension, io
from nodes import MAX_RESOLUTION

class Blend(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="ImageBlend",
            category="image/postprocessing",
            inputs=[
                io.Image.Input("image1"),
                io.Image.Input("image2"),
                io.Float.Input("blend_factor", default=0.5, min=0.0, max=1.0, step=0.01),
                io.Combo.Input("blend_mode", options=["normal", "multiply", "screen", "overlay", "soft_light", "difference"]),
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @classmethod
    def execute(cls, image1: torch.Tensor, image2: torch.Tensor, blend_factor: float, blend_mode: str) -> io.NodeOutput:
        image1, image2 = node_helpers.image_alpha_fix(image1, image2)
        image2 = image2.to(image1.device)
        if image1.shape != image2.shape:
            image2 = image2.permute(0, 3, 1, 2)
            image2 = comfy.utils.common_upscale(image2, image1.shape[2], image1.shape[1], upscale_method='bicubic', crop='center')
            image2 = image2.permute(0, 2, 3, 1)

        blended_image = cls.blend_mode(image1, image2, blend_mode)
        blended_image = image1 * (1 - blend_factor) + blended_image * blend_factor
        blended_image = torch.clamp(blended_image, 0, 1)
        return io.NodeOutput(blended_image)

    @classmethod
    def blend_mode(cls, img1, img2, mode):
        if mode == "normal":
            return img2
        elif mode == "multiply":
            return img1 * img2
        elif mode == "screen":
            return 1 - (1 - img1) * (1 - img2)
        elif mode == "overlay":
            return torch.where(img1 <= 0.5, 2 * img1 * img2, 1 - 2 * (1 - img1) * (1 - img2))
        elif mode == "soft_light":
            return torch.where(img2 <= 0.5, img1 - (1 - 2 * img2) * img1 * (1 - img1), img1 + (2 * img2 - 1) * (cls.g(img1) - img1))
        elif mode == "difference":
            return img1 - img2
        raise ValueError(f"Unsupported blend mode: {mode}")

    @classmethod
    def g(cls, x):
        return torch.where(x <= 0.25, ((16 * x - 12) * x + 4) * x, torch.sqrt(x))

def gaussian_kernel(kernel_size: int, sigma: float, device=None):
    x, y = torch.meshgrid(torch.linspace(-1, 1, kernel_size, device=device), torch.linspace(-1, 1, kernel_size, device=device), indexing="ij")
    d = torch.sqrt(x * x + y * y)
    g = torch.exp(-(d * d) / (2.0 * sigma * sigma))
    return g / g.sum()

class Blur(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="ImageBlur",
            category="image/postprocessing",
            inputs=[
                io.Image.Input("image"),
                io.Int.Input("blur_radius", default=1, min=1, max=31, step=1),
                io.Float.Input("sigma", default=1.0, min=0.1, max=10.0, step=0.1),
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @classmethod
    def execute(cls, image: torch.Tensor, blur_radius: int, sigma: float) -> io.NodeOutput:
        if blur_radius == 0:
            return io.NodeOutput(image)

        image = image.to(comfy.model_management.get_torch_device())
        batch_size, height, width, channels = image.shape

        kernel_size = blur_radius * 2 + 1
        kernel = gaussian_kernel(kernel_size, sigma, device=image.device).repeat(channels, 1, 1).unsqueeze(1)

        image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
        padded_image = F.pad(image, (blur_radius,blur_radius,blur_radius,blur_radius), 'reflect')
        blurred = F.conv2d(padded_image, kernel, padding=kernel_size // 2, groups=channels)[:,:,blur_radius:-blur_radius, blur_radius:-blur_radius]
        blurred = blurred.permute(0, 2, 3, 1)

        return io.NodeOutput(blurred.to(comfy.model_management.intermediate_device()))


class Quantize(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="ImageQuantize",
            category="image/postprocessing",
            inputs=[
                io.Image.Input("image"),
                io.Int.Input("colors", default=256, min=1, max=256, step=1),
                io.Combo.Input("dither", options=["none", "floyd-steinberg", "bayer-2", "bayer-4", "bayer-8", "bayer-16"]),
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @staticmethod
    def bayer(im, pal_im, order):
        def normalized_bayer_matrix(n):
            if n == 0:
                return np.zeros((1,1), "float32")
            else:
                q = 4 ** n
                m = q * normalized_bayer_matrix(n - 1)
                return np.bmat(((m-1.5, m+0.5), (m+1.5, m-0.5))) / q

        num_colors = len(pal_im.getpalette()) // 3
        spread = 2 * 256 / num_colors
        bayer_n = int(math.log2(order))
        bayer_matrix = torch.from_numpy(spread * normalized_bayer_matrix(bayer_n) + 0.5)

        result = torch.from_numpy(np.array(im).astype(np.float32))
        tw = math.ceil(result.shape[0] / bayer_matrix.shape[0])
        th = math.ceil(result.shape[1] / bayer_matrix.shape[1])
        tiled_matrix = bayer_matrix.tile(tw, th).unsqueeze(-1)
        result.add_(tiled_matrix[:result.shape[0],:result.shape[1]]).clamp_(0, 255)
        result = result.to(dtype=torch.uint8)

        im = Image.fromarray(result.cpu().numpy())
        im = im.quantize(palette=pal_im, dither=Image.Dither.NONE)
        return im

    @classmethod
    def execute(cls, image: torch.Tensor, colors: int, dither: str) -> io.NodeOutput:
        batch_size, height, width, _ = image.shape
        result = torch.zeros_like(image)

        for b in range(batch_size):
            im = Image.fromarray((image[b] * 255).to(torch.uint8).numpy(), mode='RGB')

            pal_im = im.quantize(colors=colors) # Required as described in https://github.com/python-pillow/Pillow/issues/5836

            if dither == "none":
                quantized_image = im.quantize(palette=pal_im, dither=Image.Dither.NONE)
            elif dither == "floyd-steinberg":
                quantized_image = im.quantize(palette=pal_im, dither=Image.Dither.FLOYDSTEINBERG)
            elif dither.startswith("bayer"):
                order = int(dither.split('-')[-1])
                quantized_image = Quantize.bayer(im, pal_im, order)

            quantized_array = torch.tensor(np.array(quantized_image.convert("RGB"))).float() / 255
            result[b] = quantized_array

        return io.NodeOutput(result)

class Sharpen(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="ImageSharpen",
            category="image/postprocessing",
            inputs=[
                io.Image.Input("image"),
                io.Int.Input("sharpen_radius", default=1, min=1, max=31, step=1),
                io.Float.Input("sigma", default=1.0, min=0.1, max=10.0, step=0.01),
                io.Float.Input("alpha", default=1.0, min=0.0, max=5.0, step=0.01),
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @classmethod
    def execute(cls, image: torch.Tensor, sharpen_radius: int, sigma:float, alpha: float) -> io.NodeOutput:
        if sharpen_radius == 0:
            return io.NodeOutput(image)

        batch_size, height, width, channels = image.shape
        image = image.to(comfy.model_management.get_torch_device())

        kernel_size = sharpen_radius * 2 + 1
        kernel = gaussian_kernel(kernel_size, sigma, device=image.device) * -(alpha*10)
        kernel = kernel.to(dtype=image.dtype)
        center = kernel_size // 2
        kernel[center, center] = kernel[center, center] - kernel.sum() + 1.0
        kernel = kernel.repeat(channels, 1, 1).unsqueeze(1)

        tensor_image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
        tensor_image = F.pad(tensor_image, (sharpen_radius,sharpen_radius,sharpen_radius,sharpen_radius), 'reflect')
        sharpened = F.conv2d(tensor_image, kernel, padding=center, groups=channels)[:,:,sharpen_radius:-sharpen_radius, sharpen_radius:-sharpen_radius]
        sharpened = sharpened.permute(0, 2, 3, 1)

        result = torch.clamp(sharpened, 0, 1)

        return io.NodeOutput(result.to(comfy.model_management.intermediate_device()))

class ImageScaleToTotalPixels(io.ComfyNode):
    upscale_methods = ["nearest-exact", "bilinear", "area", "bicubic", "lanczos"]
    crop_methods = ["disabled", "center"]

    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="ImageScaleToTotalPixels",
            category="image/upscaling",
            inputs=[
                io.Image.Input("image"),
                io.Combo.Input("upscale_method", options=cls.upscale_methods),
                io.Float.Input("megapixels", default=1.0, min=0.01, max=16.0, step=0.01),
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @classmethod
    def execute(cls, image, upscale_method, megapixels) -> io.NodeOutput:
        samples = image.movedim(-1,1)
        total = int(megapixels * 1024 * 1024)

        scale_by = math.sqrt(total / (samples.shape[3] * samples.shape[2]))
        width = round(samples.shape[3] * scale_by)
        height = round(samples.shape[2] * scale_by)

        s = comfy.utils.common_upscale(samples, width, height, upscale_method, "disabled")
        s = s.movedim(1,-1)
        return io.NodeOutput(s)

class ResizeType(str, Enum):
    SCALE_BY = "scale by multiplier"
    SCALE_DIMENSIONS = "scale dimensions"
    SCALE_LONGER_DIMENSION = "scale longer dimension"
    SCALE_SHORTER_DIMENSION = "scale shorter dimension"
    SCALE_WIDTH = "scale width"
    SCALE_HEIGHT = "scale height"
    SCALE_TOTAL_PIXELS = "scale total pixels"
    MATCH_SIZE = "match size"

def is_image(input: torch.Tensor) -> bool:
    # images have 4 dimensions: [batch, height, width, channels]
    # masks have 3 dimensions: [batch, height, width]
    return len(input.shape) == 4

def init_image_mask_input(input: torch.Tensor, is_type_image: bool) -> torch.Tensor:
    if is_type_image:
        input = input.movedim(-1, 1)
    else:
        input = input.unsqueeze(1)
    return input

def finalize_image_mask_input(input: torch.Tensor, is_type_image: bool) -> torch.Tensor:
    if is_type_image:
        input = input.movedim(1, -1)
    else:
        input = input.squeeze(1)
    return input

def scale_by(input: torch.Tensor, multiplier: float, scale_method: str) -> torch.Tensor:
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)
    width = round(input.shape[-1] * multiplier)
    height = round(input.shape[-2] * multiplier)

    input = comfy.utils.common_upscale(input, width, height, scale_method, "disabled")
    input = finalize_image_mask_input(input, is_type_image)
    return input

def scale_dimensions(input: torch.Tensor, width: int, height: int, scale_method: str, crop: str="disabled") -> torch.Tensor:
    if width == 0 and height == 0:
        return input
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)

    if width == 0:
        width = max(1, round(input.shape[-1] * height / input.shape[-2]))
    elif height == 0:
        height = max(1, round(input.shape[-2] * width / input.shape[-1]))

    input = comfy.utils.common_upscale(input, width, height, scale_method, crop)
    input = finalize_image_mask_input(input, is_type_image)
    return input

def scale_longer_dimension(input: torch.Tensor, longer_size: int, scale_method: str) -> torch.Tensor:
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)
    width = input.shape[-1]
    height = input.shape[-2]

    if height > width:
        width = round((width / height) * longer_size)
        height = longer_size
    elif width > height:
        height = round((height / width) * longer_size)
        width = longer_size
    else:
        height = longer_size
        width = longer_size

    input = comfy.utils.common_upscale(input, width, height, scale_method, "disabled")
    input = finalize_image_mask_input(input, is_type_image)
    return input

def scale_shorter_dimension(input: torch.Tensor, shorter_size: int, scale_method: str) -> torch.Tensor:
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)
    width = input.shape[-1]
    height = input.shape[-2]

    if height < width:
        width = round((width / height) * shorter_size)
        height = shorter_size
    elif width > height:
        height = round((height / width) * shorter_size)
        width = shorter_size
    else:
        height = shorter_size
        width = shorter_size

    input = comfy.utils.common_upscale(input, width, height, scale_method, "disabled")
    input = finalize_image_mask_input(input, is_type_image)
    return input

def scale_total_pixels(input: torch.Tensor, megapixels: float, scale_method: str) -> torch.Tensor:
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)
    total = int(megapixels * 1024 * 1024)

    scale_by = math.sqrt(total / (input.shape[-1] * input.shape[-2]))
    width = round(input.shape[-1] * scale_by)
    height = round(input.shape[-2] * scale_by)

    input = comfy.utils.common_upscale(input, width, height, scale_method, "disabled")
    input = finalize_image_mask_input(input, is_type_image)
    return input

def scale_match_size(input: torch.Tensor, match: torch.Tensor, scale_method: str, crop: str) -> torch.Tensor:
    is_type_image = is_image(input)
    input = init_image_mask_input(input, is_type_image)
    match = init_image_mask_input(match, is_image(match))

    width = match.shape[-1]
    height = match.shape[-2]
    input = comfy.utils.common_upscale(input, width, height, scale_method, crop)
    input = finalize_image_mask_input(input, is_type_image)
    return input

class ResizeImageMaskNode(io.ComfyNode):

    scale_methods = ["nearest-exact", "bilinear", "area", "bicubic", "lanczos"]
    crop_methods = ["disabled", "center"]

    class ResizeTypedDict(TypedDict):
        resize_type: ResizeType
        scale_method: Literal["nearest-exact", "bilinear", "area", "bicubic", "lanczos"]
        crop: Literal["disabled", "center"]
        multiplier: float
        width: int
        height: int
        longer_size: int
        shorter_size: int
        megapixels: float

    @classmethod
    def define_schema(cls):
        template = io.MatchType.Template("input_type", [io.Image, io.Mask])
        crop_combo = io.Combo.Input("crop", options=cls.crop_methods)
        return io.Schema(
            node_id="ResizeImageMaskNode",
            display_name="Resize Image/Mask",
            category="transform",
            inputs=[
                io.MatchType.Input("input", template=template),
                io.DynamicCombo.Input("resize_type", options=[
                    io.DynamicCombo.Option(ResizeType.SCALE_BY, [
                        io.Float.Input("multiplier", default=1.00, min=0.01, max=8.0, step=0.01),
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_DIMENSIONS, [
                        io.Int.Input("width", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        io.Int.Input("height", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        crop_combo,
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_LONGER_DIMENSION, [
                        io.Int.Input("longer_size", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_SHORTER_DIMENSION, [
                        io.Int.Input("shorter_size", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_WIDTH, [
                        io.Int.Input("width", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_HEIGHT, [
                        io.Int.Input("height", default=512, min=0, max=MAX_RESOLUTION, step=1),
                        ]),
                    io.DynamicCombo.Option(ResizeType.SCALE_TOTAL_PIXELS, [
                        io.Float.Input("megapixels", default=1.0, min=0.01, max=16.0, step=0.01),
                        ]),
                    io.DynamicCombo.Option(ResizeType.MATCH_SIZE, [
                        io.MultiType.Input("match", [io.Image, io.Mask]),
                        crop_combo,
                        ]),
                ]),
                io.Combo.Input("scale_method", options=cls.scale_methods, default="area"),
            ],
            outputs=[io.MatchType.Output(template=template, display_name="resized")]
        )

    @classmethod
    def execute(cls, input: io.Image.Type | io.Mask.Type, scale_method: io.Combo.Type, resize_type: ResizeTypedDict) -> io.NodeOutput:
        selected_type = resize_type["resize_type"]
        if selected_type == ResizeType.SCALE_BY:
            return io.NodeOutput(scale_by(input, resize_type["multiplier"], scale_method))
        elif selected_type == ResizeType.SCALE_DIMENSIONS:
            return io.NodeOutput(scale_dimensions(input, resize_type["width"], resize_type["height"], scale_method, resize_type["crop"]))
        elif selected_type == ResizeType.SCALE_LONGER_DIMENSION:
            return io.NodeOutput(scale_longer_dimension(input, resize_type["longer_size"], scale_method))
        elif selected_type == ResizeType.SCALE_SHORTER_DIMENSION:
            return io.NodeOutput(scale_shorter_dimension(input, resize_type["shorter_size"], scale_method))
        elif selected_type == ResizeType.SCALE_WIDTH:
            return io.NodeOutput(scale_dimensions(input, resize_type["width"], 0, scale_method))
        elif selected_type == ResizeType.SCALE_HEIGHT:
            return io.NodeOutput(scale_dimensions(input, 0, resize_type["height"], scale_method))
        elif selected_type == ResizeType.SCALE_TOTAL_PIXELS:
            return io.NodeOutput(scale_total_pixels(input, resize_type["megapixels"], scale_method))
        elif selected_type == ResizeType.MATCH_SIZE:
            return io.NodeOutput(scale_match_size(input, resize_type["match"], scale_method, resize_type["crop"]))
        raise ValueError(f"Unsupported resize type: {selected_type}")

class PostProcessingExtension(ComfyExtension):
    @override
    async def get_node_list(self) -> list[type[io.ComfyNode]]:
        return [
            Blend,
            Blur,
            Quantize,
            Sharpen,
            ImageScaleToTotalPixels,
            ResizeImageMaskNode,
        ]

async def comfy_entrypoint() -> PostProcessingExtension:
    return PostProcessingExtension()