# https://github.com/comfyanonymous/ComfyUI/blob/master/nodes.py 

import ldm_patched.modules.samplers
import ldm_patched.modules.sample
from ldm_patched.k_diffusion import sampling as k_diffusion_sampling
import ldm_patched.utils.latent_visualization
import torch
import ldm_patched.modules.utils


class BasicScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"model": ("MODEL",),
                     "scheduler": (ldm_patched.modules.samplers.SCHEDULER_NAMES, ),
                     "steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                     "denoise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 1.0, "step": 0.01}),
                      }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, model, scheduler, steps, denoise):
        total_steps = steps
        if denoise < 1.0:
            total_steps = int(steps/denoise)

        ldm_patched.modules.model_management.load_models_gpu([model])
        sigmas = ldm_patched.modules.samplers.calculate_sigmas_scheduler(model.model, scheduler, total_steps).cpu()
        sigmas = sigmas[-(steps + 1):]
        return (sigmas, )


class KarrasScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                     "sigma_max": ("FLOAT", {"default": 14.614642, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "sigma_min": ("FLOAT", {"default": 0.0291675, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "rho": ("FLOAT", {"default": 7.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                    }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, steps, sigma_max, sigma_min, rho):
        sigmas = k_diffusion_sampling.get_sigmas_karras(n=steps, sigma_min=sigma_min, sigma_max=sigma_max, rho=rho)
        return (sigmas, )

class ExponentialScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                     "sigma_max": ("FLOAT", {"default": 14.614642, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "sigma_min": ("FLOAT", {"default": 0.0291675, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                    }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, steps, sigma_max, sigma_min):
        sigmas = k_diffusion_sampling.get_sigmas_exponential(n=steps, sigma_min=sigma_min, sigma_max=sigma_max)
        return (sigmas, )

class PolyexponentialScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                     "sigma_max": ("FLOAT", {"default": 14.614642, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "sigma_min": ("FLOAT", {"default": 0.0291675, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "rho": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                    }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, steps, sigma_max, sigma_min, rho):
        sigmas = k_diffusion_sampling.get_sigmas_polyexponential(n=steps, sigma_min=sigma_min, sigma_max=sigma_max, rho=rho)
        return (sigmas, )

class SDTurboScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"model": ("MODEL",),
                     "steps": ("INT", {"default": 1, "min": 1, "max": 10}),
                     "denoise": ("FLOAT", {"default": 1.0, "min": 0, "max": 1.0, "step": 0.01}),
                      }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, model, steps, denoise):
        start_step = 10 - int(10 * denoise)
        timesteps = torch.flip(torch.arange(1, 11) * 100 - 1, (0,))[start_step:start_step + steps]
        sigmas = model.model_sampling.sigma(timesteps)
        sigmas = torch.cat([sigmas, sigmas.new_zeros([1])])
        return (sigmas, )

class VPScheduler:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
                     "beta_d": ("FLOAT", {"default": 19.9, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}), #TODO: fix default values
                     "beta_min": ("FLOAT", {"default": 0.1, "min": 0.0, "max": 1000.0, "step":0.01, "round": False}),
                     "eps_s": ("FLOAT", {"default": 0.001, "min": 0.0, "max": 1.0, "step":0.0001, "round": False}),
                    }
               }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/schedulers"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, steps, beta_d, beta_min, eps_s):
        sigmas = k_diffusion_sampling.get_sigmas_vp(n=steps, beta_d=beta_d, beta_min=beta_min, eps_s=eps_s)
        return (sigmas, )

class SplitSigmas:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"sigmas": ("SIGMAS", ),
                    "step": ("INT", {"default": 0, "min": 0, "max": 10000}),
                     }
                }
    RETURN_TYPES = ("SIGMAS","SIGMAS")
    CATEGORY = "sampling/custom_sampling/sigmas"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, sigmas, step):
        sigmas1 = sigmas[:step + 1]
        sigmas2 = sigmas[step:]
        return (sigmas1, sigmas2)

class FlipSigmas:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"sigmas": ("SIGMAS", ),
                     }
                }
    RETURN_TYPES = ("SIGMAS",)
    CATEGORY = "sampling/custom_sampling/sigmas"

    FUNCTION = "get_sigmas"

    def get_sigmas(self, sigmas):
        sigmas = sigmas.flip(0)
        if sigmas[0] == 0:
            sigmas[0] = 0.0001
        return (sigmas,)

class KSamplerSelect:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"sampler_name": (ldm_patched.modules.samplers.SAMPLER_NAMES, ),
                      }
               }
    RETURN_TYPES = ("SAMPLER",)
    CATEGORY = "sampling/custom_sampling/samplers"

    FUNCTION = "get_sampler"

    def get_sampler(self, sampler_name):
        sampler = ldm_patched.modules.samplers.sampler_object(sampler_name)
        return (sampler, )

class SamplerDPMPP_2M_SDE:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"solver_type": (['midpoint', 'heun'], ),
                     "eta": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                     "s_noise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                     "noise_device": (['gpu', 'cpu'], ),
                      }
               }
    RETURN_TYPES = ("SAMPLER",)
    CATEGORY = "sampling/custom_sampling/samplers"

    FUNCTION = "get_sampler"

    def get_sampler(self, solver_type, eta, s_noise, noise_device):
        if noise_device == 'cpu':
            sampler_name = "dpmpp_2m_sde"
        else:
            sampler_name = "dpmpp_2m_sde_gpu"
        sampler = ldm_patched.modules.samplers.ksampler(sampler_name, {"eta": eta, "s_noise": s_noise, "solver_type": solver_type})
        return (sampler, )


class SamplerDPMPP_SDE:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"eta": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                     "s_noise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                     "r": ("FLOAT", {"default": 0.5, "min": 0.0, "max": 100.0, "step":0.01, "round": False}),
                     "noise_device": (['gpu', 'cpu'], ),
                      }
               }
    RETURN_TYPES = ("SAMPLER",)
    CATEGORY = "sampling/custom_sampling/samplers"

    FUNCTION = "get_sampler"

    def get_sampler(self, eta, s_noise, r, noise_device):
        if noise_device == 'cpu':
            sampler_name = "dpmpp_sde"
        else:
            sampler_name = "dpmpp_sde_gpu"
        sampler = ldm_patched.modules.samplers.ksampler(sampler_name, {"eta": eta, "s_noise": s_noise, "r": r})
        return (sampler, )


class SamplerTCD:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "eta": ("FLOAT", {"default": 0.3, "min": 0.0, "max": 1.0, "step": 0.01}),
            }
        }
    RETURN_TYPES = ("SAMPLER",)
    CATEGORY = "sampling/custom_sampling/samplers"

    FUNCTION = "get_sampler"

    def get_sampler(self, eta=0.3):
        sampler = ldm_patched.modules.samplers.ksampler("tcd", {"eta": eta})
        return (sampler, )


class SamplerCustom:
    @classmethod
    def INPUT_TYPES(s):
        return {"required":
                    {"model": ("MODEL",),
                    "add_noise": ("BOOLEAN", {"default": True}),
                    "noise_seed": ("INT", {"default": 0, "min": 0, "max": 0xffffffffffffffff}),
                    "cfg": ("FLOAT", {"default": 8.0, "min": 0.0, "max": 100.0, "step":0.1, "round": 0.01}),
                    "positive": ("CONDITIONING", ),
                    "negative": ("CONDITIONING", ),
                    "sampler": ("SAMPLER", ),
                    "sigmas": ("SIGMAS", ),
                    "latent_image": ("LATENT", ),
                     }
                }

    RETURN_TYPES = ("LATENT","LATENT")
    RETURN_NAMES = ("output", "denoised_output")

    FUNCTION = "sample"

    CATEGORY = "sampling/custom_sampling"

    def sample(self, model, add_noise, noise_seed, cfg, positive, negative, sampler, sigmas, latent_image):
        latent = latent_image
        latent_image = latent["samples"]
        if not add_noise:
            noise = torch.zeros(latent_image.size(), dtype=latent_image.dtype, layout=latent_image.layout, device="cpu")
        else:
            batch_inds = latent["batch_index"] if "batch_index" in latent else None
            noise = ldm_patched.modules.sample.prepare_noise(latent_image, noise_seed, batch_inds)

        noise_mask = None
        if "noise_mask" in latent:
            noise_mask = latent["noise_mask"]

        x0_output = {}
        callback = ldm_patched.utils.latent_visualization.prepare_callback(model, sigmas.shape[-1] - 1, x0_output)

        disable_pbar = not ldm_patched.modules.utils.PROGRESS_BAR_ENABLED
        samples = ldm_patched.modules.sample.sample_custom(model, noise, cfg, sampler, sigmas, positive, negative, latent_image, noise_mask=noise_mask, callback=callback, disable_pbar=disable_pbar, seed=noise_seed)

        out = latent.copy()
        out["samples"] = samples
        if "x0" in x0_output:
            out_denoised = latent.copy()
            out_denoised["samples"] = model.model.process_latent_out(x0_output["x0"].cpu())
        else:
            out_denoised = out
        return (out, out_denoised)

NODE_CLASS_MAPPINGS = {
    "SamplerCustom": SamplerCustom,
    "BasicScheduler": BasicScheduler,
    "KarrasScheduler": KarrasScheduler,
    "ExponentialScheduler": ExponentialScheduler,
    "PolyexponentialScheduler": PolyexponentialScheduler,
    "VPScheduler": VPScheduler,
    "SDTurboScheduler": SDTurboScheduler,
    "KSamplerSelect": KSamplerSelect,
    "SamplerDPMPP_2M_SDE": SamplerDPMPP_2M_SDE,
    "SamplerDPMPP_SDE": SamplerDPMPP_SDE,
    "SamplerTCD": SamplerTCD,
    "SplitSigmas": SplitSigmas,
    "FlipSigmas": FlipSigmas,
}
