import torch
from ldm_patched.modules import model_management
from ldm_patched.modules.conds import CONDCrossAttn, CONDRegular
from ldm_patched.modules.ops import cleanup_cache
from ldm_patched.modules.samplers import sampling_function


def cond_from_a1111_to_patched_ldm(cond):
    if isinstance(cond, torch.Tensor):
        result = dict(
            cross_attn=cond,
            model_conds=dict(c_crossattn=CONDCrossAttn(cond)),
        )
        return [result]

    cross_attn = cond["crossattn"]
    pooled_output = cond["vector"]

    result = dict(
        cross_attn=cross_attn,
        pooled_output=pooled_output,
        model_conds=dict(c_crossattn=CONDCrossAttn(cross_attn), y=CONDRegular(pooled_output)),
    )

    return [result]


def cond_from_a1111_to_patched_ldm_weighted(cond, weights):
    transposed = list(map(list, zip(*weights)))
    results = []

    for cond_pre in transposed:
        current_indices = []
        current_weight = 0
        for i, w in cond_pre:
            current_indices.append(i)
            current_weight = w

        if hasattr(cond, "advanced_indexing"):
            feed = cond.advanced_indexing(current_indices)
        else:
            feed = cond[current_indices]

        h = cond_from_a1111_to_patched_ldm(feed)
        h[0]["strength"] = current_weight
        results += h

    return results


def forge_sample(self, denoiser_params, cond_scale, cond_composition, skip_uncond=False, options=None):
    model = self.inner_model.inner_model.forge_objects.unet.model
    control = self.inner_model.inner_model.forge_objects.unet.controlnet_linked_list
    extra_concat_condition = self.inner_model.inner_model.forge_objects.unet.extra_concat_condition
    x = denoiser_params.x
    timestep = denoiser_params.sigma
    uncond = cond_from_a1111_to_patched_ldm(denoiser_params.text_uncond)
    cond = cond_from_a1111_to_patched_ldm_weighted(denoiser_params.text_cond, cond_composition)
    model_options = self.inner_model.inner_model.forge_objects.unet.model_options
    if options is not None:
        model_options = model_options.copy()
        model_options.update(options)
    seed = self.p.seeds[0]

    if extra_concat_condition is not None:
        image_cond_in = extra_concat_condition
    else:
        image_cond_in = denoiser_params.image_cond

    if isinstance(image_cond_in, torch.Tensor):
        if image_cond_in.shape[0] == x.shape[0] and image_cond_in.shape[2] == x.shape[2] and image_cond_in.shape[3] == x.shape[3]:
            for i in range(len(uncond)):
                uncond[i]["model_conds"]["c_concat"] = CONDRegular(image_cond_in)
            for i in range(len(cond)):
                cond[i]["model_conds"]["c_concat"] = CONDRegular(image_cond_in)

    if control is not None:
        for h in cond + uncond:
            h["control"] = control

    for modifier in model_options.get("conditioning_modifiers", []):
        model, x, timestep, uncond, cond, cond_scale, model_options, seed = modifier(model, x, timestep, uncond, cond, cond_scale, model_options, seed)

    denoised = sampling_function(model, x, timestep, None if skip_uncond else uncond, cond, cond_scale, model_options, seed)
    return denoised


def sampling_prepare(unet, x):
    B, C, H, W = x.shape

    memory_estimation_function = unet.model_options.get("memory_peak_estimation_modifier", unet.memory_required)

    unet_inference_memory = memory_estimation_function([B * 2, C, H, W])
    additional_inference_memory = unet.extra_preserved_memory_during_sampling
    additional_model_patchers = unet.extra_model_patchers_during_sampling

    if unet.controlnet_linked_list is not None:
        additional_inference_memory += unet.controlnet_linked_list.inference_memory_requirements(unet.model_dtype())
        additional_model_patchers += unet.controlnet_linked_list.get_models()

    model_management.load_models_gpu(
        models=[unet] + additional_model_patchers,
        memory_required=unet_inference_memory + additional_inference_memory,
    )

    real_model = unet.model

    percent_to_timestep_function = lambda p: real_model.model_sampling.percent_to_sigma(p)

    for cnet in unet.list_controlnets():
        cnet.pre_run(real_model, percent_to_timestep_function)


def sampling_cleanup(unet):
    for cnet in unet.list_controlnets():
        cnet.cleanup()
    cleanup_cache()