import torch

import os
import sys
import json
import hashlib

from PIL import Image
from PIL.PngImagePlugin import PngInfo
import numpy as np

sys.path.append(os.path.join(sys.path[0], "comfy"))


import comfy.samplers
import comfy.sd

supported_ckpt_extensions = ['.ckpt']
try:
    import safetensors.torch
    supported_ckpt_extensions += ['.safetensors']
except:
    print("Could not import safetensors, safetensors support disabled.")

def filter_files_extensions(files, extensions):
    return sorted(list(filter(lambda a: os.path.splitext(a)[-1].lower() in extensions, files)))

class CLIPTextEncode:
    @classmethod
    def INPUT_TYPES(s):
        return {"required": {"text": ("STRING", {"multiline": True}), "clip": ("CLIP", )}}
    RETURN_TYPES = ("CONDITIONING",)
    FUNCTION = "encode"

    def encode(self, clip, text):
        return (clip.encode(text), )

class VAEDecode:
    def __init__(self, device="cpu"):
        self.device = device

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "samples": ("LATENT", ), "vae": ("VAE", )}}
    RETURN_TYPES = ("IMAGE",)
    FUNCTION = "decode"

    def decode(self, vae, samples):
        return (vae.decode(samples), )

class VAEEncode:
    def __init__(self, device="cpu"):
        self.device = device

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "pixels": ("IMAGE", ), "vae": ("VAE", )}}
    RETURN_TYPES = ("LATENT",)
    FUNCTION = "encode"

    def encode(self, vae, pixels):
        x = (pixels.shape[1] // 64) * 64
        y = (pixels.shape[2] // 64) * 64
        if pixels.shape[1] != x or pixels.shape[2] != y:
            pixels = pixels[:,:x,:y,:]
        return (vae.encode(pixels), )

class CheckpointLoader:
    models_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "models")
    config_dir = os.path.join(models_dir, "configs")
    ckpt_dir = os.path.join(models_dir, "checkpoints")

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "config_name": (filter_files_extensions(os.listdir(s.config_dir), '.yaml'), ),
                              "ckpt_name": (filter_files_extensions(os.listdir(s.ckpt_dir), supported_ckpt_extensions), )}}
    RETURN_TYPES = ("MODEL", "CLIP", "VAE")
    FUNCTION = "load_checkpoint"

    def load_checkpoint(self, config_name, ckpt_name, output_vae=True, output_clip=True):
        config_path = os.path.join(self.config_dir, config_name)
        ckpt_path = os.path.join(self.ckpt_dir, ckpt_name)
        return comfy.sd.load_checkpoint(config_path, ckpt_path, output_vae=True, output_clip=True)

class VAELoader:
    models_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "models")
    vae_dir = os.path.join(models_dir, "vae")
    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "vae_name": (filter_files_extensions(os.listdir(s.vae_dir), supported_ckpt_extensions), )}}
    RETURN_TYPES = ("VAE",)
    FUNCTION = "load_vae"

    #TODO: scale factor?
    def load_vae(self, vae_name):
        vae_path = os.path.join(self.vae_dir, vae_name)
        vae = comfy.sd.VAE(ckpt_path=vae_path)
        return (vae,)

class EmptyLatentImage:
    def __init__(self, device="cpu"):
        self.device = device

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "width": ("INT", {"default": 512, "min": 64, "max": 4096, "step": 64}),
                              "height": ("INT", {"default": 512, "min": 64, "max": 4096, "step": 64}),
                              "batch_size": ("INT", {"default": 1, "min": 1, "max": 64})}}
    RETURN_TYPES = ("LATENT",)
    FUNCTION = "generate"

    def generate(self, width, height, batch_size=1):
        latent = torch.zeros([batch_size, 4, height // 8, width // 8])
        return (latent, )

class LatentUpscale:
    upscale_methods = ["nearest-exact", "bilinear", "area"]
    crop_methods = ["disabled", "center"]

    @classmethod
    def INPUT_TYPES(s):
        return {"required": { "samples": ("LATENT",), "upscale_method": (s.upscale_methods,),
                              "width": ("INT", {"default": 512, "min": 64, "max": 4096, "step": 64}),
                              "height": ("INT", {"default": 512, "min": 64, "max": 4096, "step": 64}),
                              "crop": (s.crop_methods,)}}
    RETURN_TYPES = ("LATENT",)
    FUNCTION = "upscale"

    def upscale(self, samples, upscale_method, width, height, crop):
        if crop == "center":
            old_width = samples.shape[3]
            old_height = samples.shape[2]
            old_aspect = old_width / old_height
            new_aspect = width / height
            x = 0
            y = 0
            if old_aspect > new_aspect:
                x = round((old_width - old_width * (new_aspect / old_aspect)) / 2)
            elif old_aspect < new_aspect:
                y = round((old_height - old_height * (old_aspect / new_aspect)) / 2)
            s = samples[:,:,y:old_height-y,x:old_width-x]
        else:
            s = samples
        s = torch.nn.functional.interpolate(s, size=(height // 8, width // 8), mode=upscale_method)
        return (s,)

class KSampler:
    def __init__(self, device="cuda"):
        self.device = device

    @classmethod
    def INPUT_TYPES(s):
        return {"required": 
                    {"model": ("MODEL",),
                    "seed": ("INT", {"default": 0, "min": 0, "max": 0xffffffffffffffff}),
                    "steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                    "cfg": ("FLOAT", {"default": 8.0, "min": 0.0, "max": 100.0}),
                    "sampler_name": (comfy.samplers.KSampler.SAMPLERS, ),
                    "scheduler": (comfy.samplers.KSampler.SCHEDULERS, ),
                    "positive": ("CONDITIONING", ),
                    "negative": ("CONDITIONING", ),
                    "latent_image": ("LATENT", ),
                    "denoise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 1.0, "step": 0.01}),
                    }}

    RETURN_TYPES = ("LATENT",)
    FUNCTION = "sample"

    def sample(self, model, seed, steps, cfg, sampler_name, scheduler, positive, negative, latent_image, denoise=1.0):
        noise = torch.randn(latent_image.size(), dtype=latent_image.dtype, layout=latent_image.layout, generator=torch.manual_seed(seed), device="cpu")
        model = model.to(self.device)
        noise = noise.to(self.device)
        latent_image = latent_image.to(self.device)

        if positive.shape[0] < noise.shape[0]:
            positive = torch.cat([positive] * noise.shape[0])

        if negative.shape[0] < noise.shape[0]:
            negative = torch.cat([negative] * noise.shape[0])

        positive = positive.to(self.device)
        negative = negative.to(self.device)

        if sampler_name in comfy.samplers.KSampler.SAMPLERS:
            sampler = comfy.samplers.KSampler(model, steps=steps, device=self.device, sampler=sampler_name, scheduler=scheduler, denoise=denoise)
        else:
            #other samplers
            pass

        samples = sampler.sample(noise, positive, negative, cfg=cfg, latent_image=latent_image)
        samples = samples.cpu()
        model = model.cpu()
        return (samples, )


class SaveImage:
    def __init__(self):
        self.output_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "output")

    @classmethod
    def INPUT_TYPES(s):
        return {"required": 
                    {"images": ("IMAGE", ),
                     "filename_prefix": ("STRING", {"default": "ComfyUI"})},
                "hidden": {"prompt": "PROMPT", "extra_pnginfo": "EXTRA_PNGINFO"},
                }

    RETURN_TYPES = ()
    FUNCTION = "save_images"

    OUTPUT_NODE = True

    def save_images(self, images, filename_prefix="ComfyUI", prompt=None, extra_pnginfo=None):
        def map_filename(filename):
            prefix_len = len(filename_prefix)
            prefix = filename[:prefix_len + 1]
            try:
                digits = int(filename[prefix_len + 1:].split('_')[0])
            except:
                digits = 0
            return (digits, prefix)
        try:
            counter = max(filter(lambda a: a[1][:-1] == filename_prefix and a[1][-1] == "_", map(map_filename, os.listdir(self.output_dir))))[0] + 1
        except ValueError:
            counter = 1
        for image in images:
            i = 255. * image.cpu().numpy()
            img = Image.fromarray(i.astype(np.uint8))
            metadata = PngInfo()
            if prompt is not None:
                metadata.add_text("prompt", json.dumps(prompt))
            if extra_pnginfo is not None:
                for x in extra_pnginfo:
                    metadata.add_text(x, json.dumps(extra_pnginfo[x]))
            img.save(f"output/{filename_prefix}_{counter:05}_.png", pnginfo=metadata, optimize=True)
            counter += 1

class LoadImage:
    input_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "input")
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"image": (os.listdir(s.input_dir), )},
                }

    RETURN_TYPES = ("IMAGE",)
    FUNCTION = "load_image"
    def load_image(self, image):
        image_path = os.path.join(self.input_dir, image)
        image = Image.open(image_path).convert("RGB")
        image = np.array(image).astype(np.float32) / 255.0
        image = torch.from_numpy(image[None])[None,]
        return image

    @classmethod
    def IS_CHANGED(s, image):
        image_path = os.path.join(s.input_dir, image)
        m = hashlib.sha256()
        with open(image_path, 'rb') as f:
            m.update(f.read())
        return m.digest().hex()



NODE_CLASS_MAPPINGS = {
    "KSampler": KSampler,
    "CheckpointLoader": CheckpointLoader,
    "CLIPTextEncode": CLIPTextEncode,
    "VAEDecode": VAEDecode,
    "VAEEncode": VAEEncode,
    "VAELoader": VAELoader,
    "EmptyLatentImage": EmptyLatentImage,
    "LatentUpscale": LatentUpscale,
    "SaveImage": SaveImage,
    "LoadImage": LoadImage
}


