import math
import gradio as gr
from PIL import Image, ImageDraw, ImageOps
from modules import processing, shared, images, devices, scripts
from modules.processing import StableDiffusionProcessing
from modules.processing import Processed
from modules.shared import opts, state
from enum import Enum

elem_id_prefix = "ultimateupscale"

class USDUMode(Enum):
    LINEAR = 0
    CHESS = 1
    NONE = 2

class USDUSFMode(Enum):
    NONE = 0
    BAND_PASS = 1
    HALF_TILE = 2
    HALF_TILE_PLUS_INTERSECTIONS = 3

class USDUpscaler():

    def __init__(self, p, image, upscaler_index:int, save_redraw, save_seams_fix, tile_width, tile_height) -> None:
        self.p:StableDiffusionProcessing = p
        self.image:Image = image
        self.scale_factor = math.ceil(max(p.width, p.height) / max(image.width, image.height))
        self.upscaler = shared.sd_upscalers[upscaler_index]
        self.redraw = USDURedraw()
        self.redraw.save = save_redraw
        self.redraw.tile_width = tile_width if tile_width > 0 else tile_height
        self.redraw.tile_height = tile_height if tile_height > 0 else tile_width
        self.seams_fix = USDUSeamsFix()
        self.seams_fix.save = save_seams_fix
        self.seams_fix.tile_width = tile_width if tile_width > 0 else tile_height
        self.seams_fix.tile_height = tile_height if tile_height > 0 else tile_width
        self.initial_info = None
        self.rows = math.ceil(self.p.height / self.redraw.tile_height)
        self.cols = math.ceil(self.p.width / self.redraw.tile_width)

    def get_factor(self, num):
        # Its just return, don't need elif
        if num == 1:
            return 2
        if num % 4 == 0:
            return 4
        if num % 3 == 0:
            return 3
        if num % 2 == 0:
            return 2
        return 0

    def get_factors(self):
        scales = []
        current_scale = 1
        current_scale_factor = self.get_factor(self.scale_factor)
        while current_scale_factor == 0:
            self.scale_factor += 1
            current_scale_factor = self.get_factor(self.scale_factor)
        while current_scale < self.scale_factor:
            current_scale_factor = self.get_factor(self.scale_factor // current_scale)
            scales.append(current_scale_factor)
            current_scale = current_scale * current_scale_factor
            if current_scale_factor == 0:
                break
        self.scales = enumerate(scales)

    def upscale(self):
        # Log info
        print(f"Canva size: {self.p.width}x{self.p.height}")
        print(f"Image size: {self.image.width}x{self.image.height}")
        print(f"Scale factor: {self.scale_factor}")
        # Check upscaler is not empty
        if self.upscaler.name == "None":
            self.image = self.image.resize((self.p.width, self.p.height), resample=Image.LANCZOS)
            return
        # Get list with scale factors
        self.get_factors()
        # Upscaling image over all factors
        for index, value in self.scales:
            print(f"Upscaling iteration {index+1} with scale factor {value}")
            self.image = self.upscaler.scaler.upscale(self.image, value, self.upscaler.data_path)
        # Resize image to set values
        self.image = self.image.resize((self.p.width, self.p.height), resample=Image.LANCZOS)

    def setup_redraw(self, redraw_mode, padding, mask_blur):
        self.redraw.mode = USDUMode(redraw_mode)
        self.redraw.enabled = self.redraw.mode != USDUMode.NONE
        self.redraw.padding = padding
        self.p.mask_blur = mask_blur

    def setup_seams_fix(self, padding, denoise, mask_blur, width, mode):
        self.seams_fix.padding = padding
        self.seams_fix.denoise = denoise
        self.seams_fix.mask_blur = mask_blur
        self.seams_fix.width = width
        self.seams_fix.mode = USDUSFMode(mode)
        self.seams_fix.enabled = self.seams_fix.mode != USDUSFMode.NONE

    def save_image(self):
        if type(self.p.prompt) != list:
            images.save_image(self.image, self.p.outpath_samples, "", self.p.seed, self.p.prompt, opts.samples_format, info=self.initial_info, p=self.p)
        else:
            images.save_image(self.image, self.p.outpath_samples, "", self.p.seed, self.p.prompt[0], opts.samples_format, info=self.initial_info, p=self.p)

    def calc_jobs_count(self):
        redraw_job_count = (self.rows * self.cols) if self.redraw.enabled else 0
        seams_job_count = 0
        if self.seams_fix.mode == USDUSFMode.BAND_PASS:
            seams_job_count = self.rows + self.cols - 2
        elif self.seams_fix.mode == USDUSFMode.HALF_TILE:
            seams_job_count = self.rows * (self.cols - 1) + (self.rows - 1) * self.cols
        elif self.seams_fix.mode == USDUSFMode.HALF_TILE_PLUS_INTERSECTIONS:
            seams_job_count = self.rows * (self.cols - 1) + (self.rows - 1) * self.cols + (self.rows - 1) * (self.cols - 1)

        state.job_count = redraw_job_count + seams_job_count

    def print_info(self):
        print(f"Tile size: {self.redraw.tile_width}x{self.redraw.tile_height}")
        print(f"Tiles amount: {self.rows * self.cols}")
        print(f"Grid: {self.rows}x{self.cols}")
        print(f"Redraw enabled: {self.redraw.enabled}")
        print(f"Seams fix mode: {self.seams_fix.mode.name}")

    def add_extra_info(self):
        self.p.extra_generation_params["Ultimate SD upscale upscaler"] = self.upscaler.name
        self.p.extra_generation_params["Ultimate SD upscale tile_width"] = self.redraw.tile_width
        self.p.extra_generation_params["Ultimate SD upscale tile_height"] = self.redraw.tile_height
        self.p.extra_generation_params["Ultimate SD upscale mask_blur"] = self.p.mask_blur
        self.p.extra_generation_params["Ultimate SD upscale padding"] = self.redraw.padding

    def process(self):
        state.begin()
        self.calc_jobs_count()
        self.result_images = []
        if self.redraw.enabled:
            self.image = self.redraw.start(self.p, self.image, self.rows, self.cols)
            self.initial_info = self.redraw.initial_info
        self.result_images.append(self.image)
        if self.redraw.save:
            self.save_image()

        if self.seams_fix.enabled:
            self.image = self.seams_fix.start(self.p, self.image, self.rows, self.cols)
            self.initial_info = self.seams_fix.initial_info
            self.result_images.append(self.image)
            if self.seams_fix.save:
                self.save_image()
        state.end()

class USDURedraw():

    def init_draw(self, p, width, height):
        p.inpaint_full_res = True
        p.inpaint_full_res_padding = self.padding
        p.width = math.ceil((self.tile_width+self.padding) / 64) * 64
        p.height = math.ceil((self.tile_height+self.padding) / 64) * 64
        mask = Image.new("L", (width, height), "black")
        draw = ImageDraw.Draw(mask)
        return mask, draw

    def calc_rectangle(self, xi, yi):
        x1 = xi * self.tile_width
        y1 = yi * self.tile_height
        x2 = xi * self.tile_width + self.tile_width
        y2 = yi * self.tile_height + self.tile_height

        return x1, y1, x2, y2

    def linear_process(self, p, image, rows, cols):
        mask, draw = self.init_draw(p, image.width, image.height)
        for yi in range(rows):
            for xi in range(cols):
                if state.interrupted:
                    break
                draw.rectangle(self.calc_rectangle(xi, yi), fill="white")
                p.init_images = [image]
                p.image_mask = mask
                processed = processing.process_images(p)
                draw.rectangle(self.calc_rectangle(xi, yi), fill="black")
                if (len(processed.images) > 0):
                    image = processed.images[0]

        p.width = image.width
        p.height = image.height
        self.initial_info = processed.infotext(p, 0)

        return image

    def chess_process(self, p, image, rows, cols):
        mask, draw = self.init_draw(p, image.width, image.height)
        tiles = []
        # calc tiles colors
        for yi in range(rows):
            for xi in range(cols):
                if state.interrupted:
                    break
                if xi == 0:
                    tiles.append([])
                color = xi % 2 == 0
                if yi > 0 and yi % 2 != 0:
                    color = not color
                tiles[yi].append(color)

        for yi in range(len(tiles)):
            for xi in range(len(tiles[yi])):
                if state.interrupted:
                    break
                if not tiles[yi][xi]:
                    tiles[yi][xi] = not tiles[yi][xi]
                    continue
                tiles[yi][xi] = not tiles[yi][xi]
                draw.rectangle(self.calc_rectangle(xi, yi), fill="white")
                p.init_images = [image]
                p.image_mask = mask
                processed = processing.process_images(p)
                draw.rectangle(self.calc_rectangle(xi, yi), fill="black")
                if (len(processed.images) > 0):
                    image = processed.images[0]

        for yi in range(len(tiles)):
            for xi in range(len(tiles[yi])):
                if state.interrupted:
                    break
                if not tiles[yi][xi]:
                    continue
                draw.rectangle(self.calc_rectangle(xi, yi), fill="white")
                p.init_images = [image]
                p.image_mask = mask
                processed = processing.process_images(p)
                draw.rectangle(self.calc_rectangle(xi, yi), fill="black")
                if (len(processed.images) > 0):
                    image = processed.images[0]

        p.width = image.width
        p.height = image.height
        self.initial_info = processed.infotext(p, 0)

        return image

    def start(self, p, image, rows, cols):
        self.initial_info = None
        if self.mode == USDUMode.LINEAR:
            return self.linear_process(p, image, rows, cols)
        if self.mode == USDUMode.CHESS:
            return self.chess_process(p, image, rows, cols)

class USDUSeamsFix():

    def init_draw(self, p):
        self.initial_info = None
        p.width = math.ceil((self.tile_width+self.padding) / 64) * 64
        p.height = math.ceil((self.tile_height+self.padding) / 64) * 64

    def half_tile_process(self, p, image, rows, cols):

        self.init_draw(p)
        processed = None

        gradient = Image.linear_gradient("L")
        row_gradient = Image.new("L", (self.tile_width, self.tile_height), "black")
        row_gradient.paste(gradient.resize(
            (self.tile_width, self.tile_height//2), resample=Image.BICUBIC), (0, 0))
        row_gradient.paste(gradient.rotate(180).resize(
                (self.tile_width, self.tile_height//2), resample=Image.BICUBIC),
                (0, self.tile_height//2))
        col_gradient = Image.new("L", (self.tile_width, self.tile_height), "black")
        col_gradient.paste(gradient.rotate(90).resize(
            (self.tile_width//2, self.tile_height), resample=Image.BICUBIC), (0, 0))
        col_gradient.paste(gradient.rotate(270).resize(
            (self.tile_width//2, self.tile_height), resample=Image.BICUBIC), (self.tile_width//2, 0))

        p.denoising_strength = self.denoise
        p.mask_blur = self.mask_blur

        for yi in range(rows-1):
            for xi in range(cols):
                if state.interrupted:
                    break
                p.width = self.tile_width
                p.height = self.tile_height
                p.inpaint_full_res = True
                p.inpaint_full_res_padding = self.padding
                mask = Image.new("L", (image.width, image.height), "black")
                mask.paste(row_gradient, (xi*self.tile_width, yi*self.tile_height + self.tile_height//2))

                p.init_images = [image]
                p.image_mask = mask
                processed = processing.process_images(p)
                if (len(processed.images) > 0):
                    image = processed.images[0]

        for yi in range(rows):
            for xi in range(cols-1):
                if state.interrupted:
                    break
                p.width = self.tile_width
                p.height = self.tile_height
                p.inpaint_full_res = True
                p.inpaint_full_res_padding = self.padding
                mask = Image.new("L", (image.width, image.height), "black")
                mask.paste(col_gradient, (xi*self.tile_width+self.tile_width//2, yi*self.tile_height))

                p.init_images = [image]
                p.image_mask = mask
                processed = processing.process_images(p)
                if (len(processed.images) > 0):
                    image = processed.images[0]

        p.width = image.width
        p.height = image.height
        if processed is not None:
            self.initial_info = processed.infotext(p, 0)

        return image

    def half_tile_process_corners(self, p, image, rows, cols):
        fixed_image = self.half_tile_process(p, image, rows, cols)
        processed = None
        self.init_draw(p)
        gradient = Image.radial_gradient("L").resize(
            (self.tile_width, self.tile_height), resample=Image.BICUBIC)
        gradient = ImageOps.invert(gradient)
        p.denoising_strength = self.denoise
        #p.mask_blur = 0
        p.mask_blur = self.mask_blur

        for yi in range(rows-1):
            for xi in range(cols-1):
                if state.interrupted:
                    break
                p.width = self.tile_width
                p.height = self.tile_height
                p.inpaint_full_res = True
                p.inpaint_full_res_padding = 0
                mask = Image.new("L", (fixed_image.width, fixed_image.height), "black")
                mask.paste(gradient, (xi*self.tile_width + self.tile_width//2,
                                      yi*self.tile_height + self.tile_height//2))

                p.init_images = [fixed_image]
                p.image_mask = mask
                processed = processing.process_images(p)
                if (len(processed.images) > 0):
                    fixed_image = processed.images[0]

        p.width = fixed_image.width
        p.height = fixed_image.height
        if processed is not None:
            self.initial_info = processed.infotext(p, 0)

        return fixed_image

    def band_pass_process(self, p, image, cols, rows):

        self.init_draw(p)
        processed = None

        p.denoising_strength = self.denoise
        p.mask_blur = 0

        gradient = Image.linear_gradient("L")
        mirror_gradient = Image.new("L", (256, 256), "black")
        mirror_gradient.paste(gradient.resize((256, 128), resample=Image.BICUBIC), (0, 0))
        mirror_gradient.paste(gradient.rotate(180).resize((256, 128), resample=Image.BICUBIC), (0, 128))

        row_gradient = mirror_gradient.resize((image.width, self.width), resample=Image.BICUBIC)
        col_gradient = mirror_gradient.rotate(90).resize((self.width, image.height), resample=Image.BICUBIC)

        for xi in range(1, rows):
            if state.interrupted:
                    break
            p.width = self.width + self.padding * 2
            p.height = image.height
            p.inpaint_full_res = True
            p.inpaint_full_res_padding = self.padding
            mask = Image.new("L", (image.width, image.height), "black")
            mask.paste(col_gradient, (xi * self.tile_width - self.width // 2, 0))

            p.init_images = [image]
            p.image_mask = mask
            processed = processing.process_images(p)
            if (len(processed.images) > 0):
                image = processed.images[0]
        for yi in range(1, cols):
            if state.interrupted:
                    break
            p.width = image.width
            p.height = self.width + self.padding * 2
            p.inpaint_full_res = True
            p.inpaint_full_res_padding = self.padding
            mask = Image.new("L", (image.width, image.height), "black")
            mask.paste(row_gradient, (0, yi * self.tile_height - self.width // 2))

            p.init_images = [image]
            p.image_mask = mask
            processed = processing.process_images(p)
            if (len(processed.images) > 0):
                image = processed.images[0]

        p.width = image.width
        p.height = image.height
        if processed is not None:
            self.initial_info = processed.infotext(p, 0)

        return image

    def start(self, p, image, rows, cols):
        if USDUSFMode(self.mode) == USDUSFMode.BAND_PASS:
            return self.band_pass_process(p, image, rows, cols)
        elif USDUSFMode(self.mode) == USDUSFMode.HALF_TILE:
            return self.half_tile_process(p, image, rows, cols)
        elif USDUSFMode(self.mode) == USDUSFMode.HALF_TILE_PLUS_INTERSECTIONS:
            return self.half_tile_process_corners(p, image, rows, cols)
        else:
            return image

class Script(scripts.Script):
    def title(self):
        return "Ultimate SD upscale"

    def show(self, is_img2img):
        return is_img2img

    def ui(self, is_img2img):

        target_size_types = [
            "From img2img2 settings",
            "Custom size",
            "Scale from image size"
        ]

        seams_fix_types = [
            "None",
            "Band pass",
            "Half tile offset pass",
            "Half tile offset pass + intersections"
        ]

        redrow_modes = [
            "Linear",
            "Chess",
            "None"
        ]

        info = gr.HTML(
            "<p style=\"margin-bottom:0.75em\">Will upscale the image depending on the selected target size type</p>")

        with gr.Row():
            target_size_type = gr.Dropdown(label="Target size type", elem_id=f"{elem_id_prefix}_target_size_type", choices=[k for k in target_size_types], type="index",
                                  value=next(iter(target_size_types)))

            custom_width = gr.Slider(label='Custom width', elem_id=f"{elem_id_prefix}_custom_width", minimum=64, maximum=8192, step=64, value=2048, visible=False, interactive=True)
            custom_height = gr.Slider(label='Custom height', elem_id=f"{elem_id_prefix}_custom_height", minimum=64, maximum=8192, step=64, value=2048, visible=False, interactive=True)
            custom_scale = gr.Slider(label='Scale', elem_id=f"{elem_id_prefix}_custom_scale", minimum=1, maximum=16, step=0.01, value=2, visible=False, interactive=True)

        gr.HTML("<p style=\"margin-bottom:0.75em\">Redraw options:</p>")
        with gr.Row():
            upscaler_index = gr.Radio(label='Upscaler', elem_id=f"{elem_id_prefix}_upscaler_index", choices=[x.name for x in shared.sd_upscalers],
                                value=shared.sd_upscalers[0].name, type="index")
        with gr.Row():
            redraw_mode = gr.Dropdown(label="Type", elem_id=f"{elem_id_prefix}_redraw_mode", choices=[k for k in redrow_modes], type="index", value=next(iter(redrow_modes)))
            tile_width = gr.Slider(elem_id=f"{elem_id_prefix}_tile_width", minimum=0, maximum=2048, step=64, label='Tile width', value=512)
            tile_height = gr.Slider(elem_id=f"{elem_id_prefix}_tile_height", minimum=0, maximum=2048, step=64, label='Tile height', value=0)
            mask_blur = gr.Slider(elem_id=f"{elem_id_prefix}_mask_blur", label='Mask blur', minimum=0, maximum=64, step=1, value=8)
            padding = gr.Slider(elem_id=f"{elem_id_prefix}_padding", label='Padding', minimum=0, maximum=512, step=1, value=32)
        gr.HTML("<p style=\"margin-bottom:0.75em\">Seams fix:</p>")
        with gr.Row():
            seams_fix_type = gr.Dropdown(label="Type", elem_id=f"{elem_id_prefix}_seams_fix_type", choices=[k for k in seams_fix_types], type="index", value=next(iter(seams_fix_types)))
            seams_fix_denoise = gr.Slider(label='Denoise', elem_id=f"{elem_id_prefix}_seams_fix_denoise", minimum=0, maximum=1, step=0.01, value=0.35, visible=False, interactive=True)
            seams_fix_width = gr.Slider(label='Width', elem_id=f"{elem_id_prefix}_seams_fix_width", minimum=0, maximum=128, step=1, value=64, visible=False, interactive=True)
            seams_fix_mask_blur = gr.Slider(label='Mask blur', elem_id=f"{elem_id_prefix}_seams_fix_mask_blur", minimum=0, maximum=64, step=1, value=4, visible=False, interactive=True)
            seams_fix_padding = gr.Slider(label='Padding', elem_id=f"{elem_id_prefix}_seams_fix_padding", minimum=0, maximum=128, step=1, value=16, visible=False, interactive=True)
        gr.HTML("<p style=\"margin-bottom:0.75em\">Save options:</p>")
        with gr.Row():
            save_upscaled_image = gr.Checkbox(label="Upscaled", elem_id=f"{elem_id_prefix}_save_upscaled_image", value=True)
            save_seams_fix_image = gr.Checkbox(label="Seams fix", elem_id=f"{elem_id_prefix}_save_seams_fix_image", value=False)

        def select_fix_type(fix_index):
            all_visible = fix_index != 0
            mask_blur_visible = fix_index == 2 or fix_index == 3
            width_visible = fix_index == 1

            return [gr.update(visible=all_visible),
                    gr.update(visible=width_visible),
                    gr.update(visible=mask_blur_visible),
                    gr.update(visible=all_visible)]

        seams_fix_type.change(
            fn=select_fix_type,
            inputs=seams_fix_type,
            outputs=[seams_fix_denoise, seams_fix_width, seams_fix_mask_blur, seams_fix_padding]
        )

        def select_scale_type(scale_index):
            is_custom_size = scale_index == 1
            is_custom_scale = scale_index == 2

            return [gr.update(visible=is_custom_size),
                    gr.update(visible=is_custom_size),
                    gr.update(visible=is_custom_scale),
                    ]

        target_size_type.change(
            fn=select_scale_type,
            inputs=target_size_type,
            outputs=[custom_width, custom_height, custom_scale]
        )

        return [info, tile_width, tile_height, mask_blur, padding, seams_fix_width, seams_fix_denoise, seams_fix_padding,
                upscaler_index, save_upscaled_image, redraw_mode, save_seams_fix_image, seams_fix_mask_blur,
                seams_fix_type, target_size_type, custom_width, custom_height, custom_scale]

    def run(self, p, _, tile_width, tile_height, mask_blur, padding, seams_fix_width, seams_fix_denoise, seams_fix_padding,
            upscaler_index, save_upscaled_image, redraw_mode, save_seams_fix_image, seams_fix_mask_blur,
            seams_fix_type, target_size_type, custom_width, custom_height, custom_scale):

        # Init
        processing.fix_seed(p)
        devices.torch_gc()

        p.do_not_save_grid = True
        p.do_not_save_samples = True
        p.inpaint_full_res = False

        p.inpainting_fill = 1
        p.n_iter = 1
        p.batch_size = 1

        seed = p.seed

        # Init image
        init_img = p.init_images[0]
        if init_img == None:
            return Processed(p, [], seed, "Empty image")
        init_img = images.flatten(init_img, opts.img2img_background_color)

        #override size
        if target_size_type == 1:
            p.width = custom_width
            p.height = custom_height
        if target_size_type == 2:
            p.width = math.ceil((init_img.width * custom_scale) / 64) * 64
            p.height = math.ceil((init_img.height * custom_scale) / 64) * 64

        # Upscaling
        upscaler = USDUpscaler(p, init_img, upscaler_index, save_upscaled_image, save_seams_fix_image, tile_width, tile_height)
        upscaler.upscale()
        
        # Drawing
        upscaler.setup_redraw(redraw_mode, padding, mask_blur)
        upscaler.setup_seams_fix(seams_fix_padding, seams_fix_denoise, seams_fix_mask_blur, seams_fix_width, seams_fix_type)
        upscaler.print_info()
        upscaler.add_extra_info()
        upscaler.process()
        result_images = upscaler.result_images

        return Processed(p, result_images, seed, upscaler.initial_info if upscaler.initial_info is not None else "")