# LoRA network module for Anima
import ast
import math
import os
import re
from typing import Dict, List, Optional, Tuple, Type, Union
import torch
from library.utils import setup_logging

import logging

setup_logging()
logger = logging.getLogger(__name__)


class LoRAModule(torch.nn.Module):
    """
    replaces forward method of the original Linear, instead of replacing the original Linear module.
    """

    def __init__(
        self,
        lora_name,
        org_module: torch.nn.Module,
        multiplier=1.0,
        lora_dim=4,
        alpha=1,
        dropout=None,
        rank_dropout=None,
        module_dropout=None,
    ):
        """
        if alpha == 0 or None, alpha is rank (no scaling).
        """
        super().__init__()
        self.lora_name = lora_name

        if org_module.__class__.__name__ == "Conv2d":
            in_dim = org_module.in_channels
            out_dim = org_module.out_channels
        else:
            in_dim = org_module.in_features
            out_dim = org_module.out_features

        self.lora_dim = lora_dim

        if org_module.__class__.__name__ == "Conv2d":
            kernel_size = org_module.kernel_size
            stride = org_module.stride
            padding = org_module.padding
            self.lora_down = torch.nn.Conv2d(in_dim, self.lora_dim, kernel_size, stride, padding, bias=False)
            self.lora_up = torch.nn.Conv2d(self.lora_dim, out_dim, (1, 1), (1, 1), bias=False)
        else:
            self.lora_down = torch.nn.Linear(in_dim, self.lora_dim, bias=False)
            self.lora_up = torch.nn.Linear(self.lora_dim, out_dim, bias=False)

        torch.nn.init.kaiming_uniform_(self.lora_down.weight, a=math.sqrt(5))
        torch.nn.init.zeros_(self.lora_up.weight)

        if type(alpha) == torch.Tensor:
            alpha = alpha.detach().float().numpy()  # without casting, bf16 causes error
        alpha = self.lora_dim if alpha is None or alpha == 0 else alpha
        self.scale = alpha / self.lora_dim
        self.register_buffer("alpha", torch.tensor(alpha))  # 定数として扱える

        # same as microsoft's
        self.multiplier = multiplier
        self.org_module = org_module  # remove in applying
        self.dropout = dropout
        self.rank_dropout = rank_dropout
        self.module_dropout = module_dropout

    def apply_to(self):
        self.org_forward = self.org_module.forward
        self.org_module.forward = self.forward

        del self.org_module

    def forward(self, x):
        org_forwarded = self.org_forward(x)

        # module dropout
        if self.module_dropout is not None and self.training:
            if torch.rand(1) < self.module_dropout:
                return org_forwarded

        lx = self.lora_down(x)

        # normal dropout
        if self.dropout is not None and self.training:
            lx = torch.nn.functional.dropout(lx, p=self.dropout)

        # rank dropout
        if self.rank_dropout is not None and self.training:
            mask = torch.rand((lx.size(0), self.lora_dim), device=lx.device) > self.rank_dropout
            if isinstance(self.lora_down, torch.nn.Conv2d):
                # Conv2d: lora_dim is at dim 1 → [B, dim, 1, 1]
                mask = mask.unsqueeze(-1).unsqueeze(-1)
            else:
                # Linear: lora_dim is at last dim → [B, 1, ..., 1, dim]
                for _ in range(len(lx.size()) - 2):
                    mask = mask.unsqueeze(1)
            lx = lx * mask

            # scaling for rank dropout: treat as if the rank is changed
            # maskから計算することも考えられるが、augmentation的な効果を期待してrank_dropoutを用いる
            scale = self.scale * (1.0 / (1.0 - self.rank_dropout))  # redundant for readability
        else:
            scale = self.scale

        lx = self.lora_up(lx)

        return org_forwarded + lx * self.multiplier * scale

    @property
    def device(self):
        return next(self.parameters()).device

    @property
    def dtype(self):
        return next(self.parameters()).dtype


class LoRAInfModule(LoRAModule):
    def __init__(
        self,
        lora_name,
        org_module: torch.nn.Module,
        multiplier=1.0,
        lora_dim=4,
        alpha=1,
        **kwargs,
    ):
        # no dropout for inference
        super().__init__(lora_name, org_module, multiplier, lora_dim, alpha)

        self.org_module_ref = [org_module]  # 後から参照できるように
        self.enabled = True
        self.network: LoRANetwork = None

    def set_network(self, network):
        self.network = network

    # freezeしてマージする
    def merge_to(self, sd, dtype, device):
        # extract weight from org_module
        org_sd = self.org_module.state_dict()
        weight = org_sd["weight"]
        org_dtype = weight.dtype
        org_device = weight.device

        if dtype is None:
            dtype = org_dtype
        if device is None:
            device = org_device

        # get up/down weight
        down_weight = sd["lora_down.weight"].to(torch.float).to(device)
        up_weight = sd["lora_up.weight"].to(torch.float).to(device)

        # weight
        weight = weight.to(torch.float).to(device)  # calc in float

        # merge weight
        if len(weight.size()) == 2:
            # linear
            weight = weight + self.multiplier * (up_weight @ down_weight) * self.scale
        elif down_weight.size()[2:4] == (1, 1):
            # conv2d 1x1
            weight = (
                weight
                + self.multiplier
                * (up_weight.squeeze(3).squeeze(2) @ down_weight.squeeze(3).squeeze(2)).unsqueeze(2).unsqueeze(3)
                * self.scale
            )
        else:
            # conv2d 3x3
            conved = torch.nn.functional.conv2d(down_weight.permute(1, 0, 2, 3), up_weight).permute(1, 0, 2, 3)
            # logger.info(conved.size(), weight.size(), module.stride, module.padding)
            weight = weight + self.multiplier * conved * self.scale

        # set weight to org_module
        org_sd["weight"] = weight.to(dtype)
        self.org_module.load_state_dict(org_sd)

    # 復元できるマージのため、このモジュールのweightを返す
    def get_weight(self, multiplier=None):
        if multiplier is None:
            multiplier = self.multiplier

        # get up/down weight from module
        up_weight = self.lora_up.weight.to(torch.float)
        down_weight = self.lora_down.weight.to(torch.float)

        # pre-calculated weight
        if len(down_weight.size()) == 2:
            # linear
            weight = self.multiplier * (up_weight @ down_weight) * self.scale
        elif down_weight.size()[2:4] == (1, 1):
            # conv2d 1x1
            weight = (
                self.multiplier
                * (up_weight.squeeze(3).squeeze(2) @ down_weight.squeeze(3).squeeze(2)).unsqueeze(2).unsqueeze(3)
                * self.scale
            )
        else:
            # conv2d 3x3
            conved = torch.nn.functional.conv2d(down_weight.permute(1, 0, 2, 3), up_weight).permute(1, 0, 2, 3)
            weight = self.multiplier * conved * self.scale

        return weight

    def default_forward(self, x):
        # logger.info(f"default_forward {self.lora_name} {x.size()}")
        lx = self.lora_down(x)
        lx = self.lora_up(lx)
        return self.org_forward(x) + lx * self.multiplier * self.scale

    def forward(self, x):
        if not self.enabled:
            return self.org_forward(x)
        return self.default_forward(x)


def create_network(
    multiplier: float,
    network_dim: Optional[int],
    network_alpha: Optional[float],
    vae,
    text_encoders: list,
    unet,
    neuron_dropout: Optional[float] = None,
    **kwargs,
):
    if network_dim is None:
        network_dim = 4
    if network_alpha is None:
        network_alpha = 1.0

    # train LLM adapter
    train_llm_adapter = kwargs.get("train_llm_adapter", "false")
    if train_llm_adapter is not None:
        train_llm_adapter = True if train_llm_adapter.lower() == "true" else False

    exclude_patterns = kwargs.get("exclude_patterns", None)
    if exclude_patterns is None:
        exclude_patterns = []
    else:
        exclude_patterns = ast.literal_eval(exclude_patterns)
        if not isinstance(exclude_patterns, list):
            exclude_patterns = [exclude_patterns]

    # add default exclude patterns
    exclude_patterns.append(r".*(_modulation|_norm|_embedder|final_layer).*")

    # regular expression for module selection: exclude and include
    include_patterns = kwargs.get("include_patterns", None)
    if include_patterns is not None:
        include_patterns = ast.literal_eval(include_patterns)
        if not isinstance(include_patterns, list):
            include_patterns = [include_patterns]

    # rank/module dropout
    rank_dropout = kwargs.get("rank_dropout", None)
    if rank_dropout is not None:
        rank_dropout = float(rank_dropout)
    module_dropout = kwargs.get("module_dropout", None)
    if module_dropout is not None:
        module_dropout = float(module_dropout)

    # verbose
    verbose = kwargs.get("verbose", "false")
    if verbose is not None:
        verbose = True if verbose.lower() == "true" else False

    # regex-specific learning rates / dimensions
    def parse_kv_pairs(kv_pair_str: str, is_int: bool) -> Dict[str, float]:
        """
        Parse a string of key-value pairs separated by commas.
        """
        pairs = {}
        for pair in kv_pair_str.split(","):
            pair = pair.strip()
            if not pair:
                continue
            if "=" not in pair:
                logger.warning(f"Invalid format: {pair}, expected 'key=value'")
                continue
            key, value = pair.split("=", 1)
            key = key.strip()
            value = value.strip()
            try:
                pairs[key] = int(value) if is_int else float(value)
            except ValueError:
                logger.warning(f"Invalid value for {key}: {value}")
        return pairs

    network_reg_lrs = kwargs.get("network_reg_lrs", None)
    if network_reg_lrs is not None:
        reg_lrs = parse_kv_pairs(network_reg_lrs, is_int=False)
    else:
        reg_lrs = None

    network_reg_dims = kwargs.get("network_reg_dims", None)
    if network_reg_dims is not None:
        reg_dims = parse_kv_pairs(network_reg_dims, is_int=True)
    else:
        reg_dims = None

    network = LoRANetwork(
        text_encoders,
        unet,
        multiplier=multiplier,
        lora_dim=network_dim,
        alpha=network_alpha,
        dropout=neuron_dropout,
        rank_dropout=rank_dropout,
        module_dropout=module_dropout,
        train_llm_adapter=train_llm_adapter,
        exclude_patterns=exclude_patterns,
        include_patterns=include_patterns,
        reg_dims=reg_dims,
        reg_lrs=reg_lrs,
        verbose=verbose,
    )

    loraplus_lr_ratio = kwargs.get("loraplus_lr_ratio", None)
    loraplus_unet_lr_ratio = kwargs.get("loraplus_unet_lr_ratio", None)
    loraplus_text_encoder_lr_ratio = kwargs.get("loraplus_text_encoder_lr_ratio", None)
    loraplus_lr_ratio = float(loraplus_lr_ratio) if loraplus_lr_ratio is not None else None
    loraplus_unet_lr_ratio = float(loraplus_unet_lr_ratio) if loraplus_unet_lr_ratio is not None else None
    loraplus_text_encoder_lr_ratio = float(loraplus_text_encoder_lr_ratio) if loraplus_text_encoder_lr_ratio is not None else None
    if loraplus_lr_ratio is not None or loraplus_unet_lr_ratio is not None or loraplus_text_encoder_lr_ratio is not None:
        network.set_loraplus_lr_ratio(loraplus_lr_ratio, loraplus_unet_lr_ratio, loraplus_text_encoder_lr_ratio)

    return network


def create_network_from_weights(multiplier, file, ae, text_encoders, unet, weights_sd=None, for_inference=False, **kwargs):
    if weights_sd is None:
        if os.path.splitext(file)[1] == ".safetensors":
            from safetensors.torch import load_file

            weights_sd = load_file(file)
        else:
            weights_sd = torch.load(file, map_location="cpu")

    modules_dim = {}
    modules_alpha = {}
    train_llm_adapter = False
    for key, value in weights_sd.items():
        if "." not in key:
            continue

        lora_name = key.split(".")[0]
        if "alpha" in key:
            modules_alpha[lora_name] = value
        elif "lora_down" in key:
            dim = value.size()[0]
            modules_dim[lora_name] = dim

        if "llm_adapter" in lora_name:
            train_llm_adapter = True

    module_class = LoRAInfModule if for_inference else LoRAModule

    network = LoRANetwork(
        text_encoders,
        unet,
        multiplier=multiplier,
        modules_dim=modules_dim,
        modules_alpha=modules_alpha,
        module_class=module_class,
        train_llm_adapter=train_llm_adapter,
    )
    return network, weights_sd


class LoRANetwork(torch.nn.Module):
    # Target modules: DiT blocks, embedders, final layer. embedders and final layer are excluded by default.
    ANIMA_TARGET_REPLACE_MODULE = ["Block", "PatchEmbed", "TimestepEmbedding", "FinalLayer"]
    # Target modules: LLM Adapter blocks
    ANIMA_ADAPTER_TARGET_REPLACE_MODULE = ["LLMAdapterTransformerBlock"]
    # Target modules for text encoder (Qwen3)
    TEXT_ENCODER_TARGET_REPLACE_MODULE = ["Qwen3Attention", "Qwen3MLP", "Qwen3SdpaAttention", "Qwen3FlashAttention2"]

    LORA_PREFIX_ANIMA = "lora_unet"  # ComfyUI compatible
    LORA_PREFIX_TEXT_ENCODER = "lora_te"  # Qwen3

    def __init__(
        self,
        text_encoders: list,
        unet,
        multiplier: float = 1.0,
        lora_dim: int = 4,
        alpha: float = 1,
        dropout: Optional[float] = None,
        rank_dropout: Optional[float] = None,
        module_dropout: Optional[float] = None,
        module_class: Type[object] = LoRAModule,
        modules_dim: Optional[Dict[str, int]] = None,
        modules_alpha: Optional[Dict[str, int]] = None,
        train_llm_adapter: bool = False,
        exclude_patterns: Optional[List[str]] = None,
        include_patterns: Optional[List[str]] = None,
        reg_dims: Optional[Dict[str, int]] = None,
        reg_lrs: Optional[Dict[str, float]] = None,
        verbose: Optional[bool] = False,
    ) -> None:
        super().__init__()
        self.multiplier = multiplier
        self.lora_dim = lora_dim
        self.alpha = alpha
        self.dropout = dropout
        self.rank_dropout = rank_dropout
        self.module_dropout = module_dropout
        self.train_llm_adapter = train_llm_adapter
        self.reg_dims = reg_dims
        self.reg_lrs = reg_lrs

        self.loraplus_lr_ratio = None
        self.loraplus_unet_lr_ratio = None
        self.loraplus_text_encoder_lr_ratio = None

        if modules_dim is not None:
            logger.info("create LoRA network from weights")
        else:
            logger.info(f"create LoRA network. base dim (rank): {lora_dim}, alpha: {alpha}")
            logger.info(
                f"neuron dropout: p={self.dropout}, rank dropout: p={self.rank_dropout}, module dropout: p={self.module_dropout}"
            )

        # compile regular expression if specified
        def str_to_re_patterns(patterns: Optional[List[str]]) -> List[re.Pattern]:
            re_patterns = []
            if patterns is not None:
                for pattern in patterns:
                    try:
                        re_pattern = re.compile(pattern)
                    except re.error as e:
                        logger.error(f"Invalid pattern '{pattern}': {e}")
                        continue
                    re_patterns.append(re_pattern)
            return re_patterns

        exclude_re_patterns = str_to_re_patterns(exclude_patterns)
        include_re_patterns = str_to_re_patterns(include_patterns)

        # create module instances
        def create_modules(
            is_unet: bool,
            text_encoder_idx: Optional[int],
            root_module: torch.nn.Module,
            target_replace_modules: List[str],
            default_dim: Optional[int] = None,
        ) -> Tuple[List[LoRAModule], List[str]]:
            prefix = self.LORA_PREFIX_ANIMA if is_unet else self.LORA_PREFIX_TEXT_ENCODER

            loras = []
            skipped = []
            for name, module in root_module.named_modules():
                if target_replace_modules is None or module.__class__.__name__ in target_replace_modules:
                    if target_replace_modules is None:
                        module = root_module

                    for child_name, child_module in module.named_modules():
                        is_linear = child_module.__class__.__name__ == "Linear"
                        is_conv2d = child_module.__class__.__name__ == "Conv2d"
                        is_conv2d_1x1 = is_conv2d and child_module.kernel_size == (1, 1)

                        if is_linear or is_conv2d:
                            original_name = (name + "." if name else "") + child_name
                            lora_name = f"{prefix}.{original_name}".replace(".", "_")

                            # exclude/include filter (fullmatch: pattern must match the entire original_name)
                            excluded = any(pattern.fullmatch(original_name) for pattern in exclude_re_patterns)
                            included = any(pattern.fullmatch(original_name) for pattern in include_re_patterns)
                            if excluded and not included:
                                if verbose:
                                    logger.info(f"exclude: {original_name}")
                                continue

                            dim = None
                            alpha_val = None

                            if modules_dim is not None:
                                if lora_name in modules_dim:
                                    dim = modules_dim[lora_name]
                                    alpha_val = modules_alpha[lora_name]
                            else:
                                if self.reg_dims is not None:
                                    for reg, d in self.reg_dims.items():
                                        if re.fullmatch(reg, original_name):
                                            dim = d
                                            alpha_val = self.alpha
                                            logger.info(f"Module {original_name} matched with regex '{reg}' -> dim: {dim}")
                                            break
                                # fallback to default dim if not matched by reg_dims or reg_dims is not specified
                                if dim is None:
                                    if is_linear or is_conv2d_1x1:
                                        dim = default_dim if default_dim is not None else self.lora_dim
                                        alpha_val = self.alpha

                            if dim is None or dim == 0:
                                if is_linear or is_conv2d_1x1:
                                    skipped.append(lora_name)
                                continue

                            lora = module_class(
                                lora_name,
                                child_module,
                                self.multiplier,
                                dim,
                                alpha_val,
                                dropout=dropout,
                                rank_dropout=rank_dropout,
                                module_dropout=module_dropout,
                            )
                            lora.original_name = original_name
                            loras.append(lora)

                    if target_replace_modules is None:
                        break
            return loras, skipped

        # Create LoRA for text encoders (Qwen3 - typically not trained for Anima)
        self.text_encoder_loras: List[Union[LoRAModule, LoRAInfModule]] = []
        skipped_te = []
        if text_encoders is not None:
            for i, text_encoder in enumerate(text_encoders):
                if text_encoder is None:
                    continue
                logger.info(f"create LoRA for Text Encoder {i+1}:")
                te_loras, te_skipped = create_modules(False, i, text_encoder, LoRANetwork.TEXT_ENCODER_TARGET_REPLACE_MODULE)
                logger.info(f"create LoRA for Text Encoder {i+1}: {len(te_loras)} modules.")
                self.text_encoder_loras.extend(te_loras)
                skipped_te += te_skipped

        # Create LoRA for DiT blocks
        target_modules = list(LoRANetwork.ANIMA_TARGET_REPLACE_MODULE)
        if train_llm_adapter:
            target_modules.extend(LoRANetwork.ANIMA_ADAPTER_TARGET_REPLACE_MODULE)

        self.unet_loras: List[Union[LoRAModule, LoRAInfModule]]
        self.unet_loras, skipped_un = create_modules(True, None, unet, target_modules)

        logger.info(f"create LoRA for Anima DiT: {len(self.unet_loras)} modules.")
        if verbose:
            for lora in self.unet_loras:
                logger.info(f"\t{lora.lora_name:60} {lora.lora_dim}, {lora.alpha}")

        skipped = skipped_te + skipped_un
        if verbose and len(skipped) > 0:
            logger.warning(f"dim (rank) is 0, {len(skipped)} LoRA modules are skipped:")
            for name in skipped:
                logger.info(f"\t{name}")

        # assertion: no duplicate names
        names = set()
        for lora in self.text_encoder_loras + self.unet_loras:
            assert lora.lora_name not in names, f"duplicated lora name: {lora.lora_name}"
            names.add(lora.lora_name)

    def set_multiplier(self, multiplier):
        self.multiplier = multiplier
        for lora in self.text_encoder_loras + self.unet_loras:
            lora.multiplier = self.multiplier

    def set_enabled(self, is_enabled):
        for lora in self.text_encoder_loras + self.unet_loras:
            lora.enabled = is_enabled

    def load_weights(self, file):
        if os.path.splitext(file)[1] == ".safetensors":
            from safetensors.torch import load_file

            weights_sd = load_file(file)
        else:
            weights_sd = torch.load(file, map_location="cpu")

        info = self.load_state_dict(weights_sd, False)
        return info

    def apply_to(self, text_encoders, unet, apply_text_encoder=True, apply_unet=True):
        if apply_text_encoder:
            logger.info(f"enable LoRA for text encoder: {len(self.text_encoder_loras)} modules")
        else:
            self.text_encoder_loras = []

        if apply_unet:
            logger.info(f"enable LoRA for DiT: {len(self.unet_loras)} modules")
        else:
            self.unet_loras = []

        for lora in self.text_encoder_loras + self.unet_loras:
            lora.apply_to()
            self.add_module(lora.lora_name, lora)

    def is_mergeable(self):
        return True

    def merge_to(self, text_encoders, unet, weights_sd, dtype=None, device=None):
        apply_text_encoder = apply_unet = False
        for key in weights_sd.keys():
            if key.startswith(LoRANetwork.LORA_PREFIX_TEXT_ENCODER):
                apply_text_encoder = True
            elif key.startswith(LoRANetwork.LORA_PREFIX_ANIMA):
                apply_unet = True

        if apply_text_encoder:
            logger.info("enable LoRA for text encoder")
        else:
            self.text_encoder_loras = []

        if apply_unet:
            logger.info("enable LoRA for DiT")
        else:
            self.unet_loras = []

        for lora in self.text_encoder_loras + self.unet_loras:
            sd_for_lora = {}
            for key in weights_sd.keys():
                if key.startswith(lora.lora_name):
                    sd_for_lora[key[len(lora.lora_name) + 1 :]] = weights_sd[key]
            lora.merge_to(sd_for_lora, dtype, device)

        logger.info("weights are merged")

    def set_loraplus_lr_ratio(self, loraplus_lr_ratio, loraplus_unet_lr_ratio, loraplus_text_encoder_lr_ratio):
        self.loraplus_lr_ratio = loraplus_lr_ratio
        self.loraplus_unet_lr_ratio = loraplus_unet_lr_ratio
        self.loraplus_text_encoder_lr_ratio = loraplus_text_encoder_lr_ratio

        logger.info(f"LoRA+ UNet LR Ratio: {self.loraplus_unet_lr_ratio or self.loraplus_lr_ratio}")
        logger.info(f"LoRA+ Text Encoder LR Ratio: {self.loraplus_text_encoder_lr_ratio or self.loraplus_lr_ratio}")

    def prepare_optimizer_params_with_multiple_te_lrs(self, text_encoder_lr, unet_lr, default_lr):
        if text_encoder_lr is None or (isinstance(text_encoder_lr, list) and len(text_encoder_lr) == 0):
            text_encoder_lr = [default_lr]
        elif isinstance(text_encoder_lr, float) or isinstance(text_encoder_lr, int):
            text_encoder_lr = [float(text_encoder_lr)]
        elif len(text_encoder_lr) == 1:
            pass  # already a list with one element

        self.requires_grad_(True)

        all_params = []
        lr_descriptions = []

        def assemble_params(loras, lr, loraplus_ratio):
            param_groups = {"lora": {}, "plus": {}}
            reg_groups = {}
            reg_lrs_list = list(self.reg_lrs.items()) if self.reg_lrs is not None else []

            for lora in loras:
                matched_reg_lr = None
                for i, (regex_str, reg_lr) in enumerate(reg_lrs_list):
                    if re.fullmatch(regex_str, lora.original_name):
                        matched_reg_lr = (i, reg_lr)
                        logger.info(f"Module {lora.original_name} matched regex '{regex_str}' -> LR {reg_lr}")
                        break

                for name, param in lora.named_parameters():
                    if matched_reg_lr is not None:
                        reg_idx, reg_lr = matched_reg_lr
                        group_key = f"reg_lr_{reg_idx}"
                        if group_key not in reg_groups:
                            reg_groups[group_key] = {"lora": {}, "plus": {}, "lr": reg_lr}
                        if loraplus_ratio is not None and "lora_up" in name:
                            reg_groups[group_key]["plus"][f"{lora.lora_name}.{name}"] = param
                        else:
                            reg_groups[group_key]["lora"][f"{lora.lora_name}.{name}"] = param
                        continue

                    if loraplus_ratio is not None and "lora_up" in name:
                        param_groups["plus"][f"{lora.lora_name}.{name}"] = param
                    else:
                        param_groups["lora"][f"{lora.lora_name}.{name}"] = param

            params = []
            descriptions = []
            for group_key, group in reg_groups.items():
                reg_lr = group["lr"]
                for key in ("lora", "plus"):
                    param_data = {"params": group[key].values()}
                    if len(param_data["params"]) == 0:
                        continue
                    if key == "plus":
                        param_data["lr"] = reg_lr * loraplus_ratio if loraplus_ratio is not None else reg_lr
                    else:
                        param_data["lr"] = reg_lr
                    if param_data.get("lr", None) == 0 or param_data.get("lr", None) is None:
                        logger.info("NO LR skipping!")
                        continue
                    params.append(param_data)
                    desc = f"reg_lr_{group_key.split('_')[-1]}"
                    descriptions.append(desc + (" plus" if key == "plus" else ""))

            for key in param_groups.keys():
                param_data = {"params": param_groups[key].values()}
                if len(param_data["params"]) == 0:
                    continue
                if lr is not None:
                    if key == "plus":
                        param_data["lr"] = lr * loraplus_ratio
                    else:
                        param_data["lr"] = lr
                if param_data.get("lr", None) == 0 or param_data.get("lr", None) is None:
                    logger.info("NO LR skipping!")
                    continue
                params.append(param_data)
                descriptions.append("plus" if key == "plus" else "")
            return params, descriptions

        if self.text_encoder_loras:
            loraplus_ratio = self.loraplus_text_encoder_lr_ratio or self.loraplus_lr_ratio
            te1_loras = [lora for lora in self.text_encoder_loras if lora.lora_name.startswith(self.LORA_PREFIX_TEXT_ENCODER)]
            if len(te1_loras) > 0:
                logger.info(f"Text Encoder 1 (Qwen3): {len(te1_loras)} modules, LR {text_encoder_lr[0]}")
                params, descriptions = assemble_params(te1_loras, text_encoder_lr[0], loraplus_ratio)
                all_params.extend(params)
                lr_descriptions.extend(["textencoder 1" + (" " + d if d else "") for d in descriptions])

        if self.unet_loras:
            params, descriptions = assemble_params(
                self.unet_loras,
                unet_lr if unet_lr is not None else default_lr,
                self.loraplus_unet_lr_ratio or self.loraplus_lr_ratio,
            )
            all_params.extend(params)
            lr_descriptions.extend(["unet" + (" " + d if d else "") for d in descriptions])

        return all_params, lr_descriptions

    def enable_gradient_checkpointing(self):
        pass  # not supported

    def prepare_grad_etc(self, text_encoder, unet):
        self.requires_grad_(True)

    def on_epoch_start(self, text_encoder, unet):
        self.train()

    def get_trainable_params(self):
        return self.parameters()

    def save_weights(self, file, dtype, metadata):
        if metadata is not None and len(metadata) == 0:
            metadata = None

        state_dict = self.state_dict()

        if dtype is not None:
            for key in list(state_dict.keys()):
                v = state_dict[key]
                v = v.detach().clone().to("cpu").to(dtype)
                state_dict[key] = v

        if os.path.splitext(file)[1] == ".safetensors":
            from safetensors.torch import save_file
            from library import train_util

            if metadata is None:
                metadata = {}
            model_hash, legacy_hash = train_util.precalculate_safetensors_hashes(state_dict, metadata)
            metadata["sshs_model_hash"] = model_hash
            metadata["sshs_legacy_hash"] = legacy_hash

            save_file(state_dict, file, metadata)
        else:
            torch.save(state_dict, file)

    def backup_weights(self):
        loras: List[LoRAInfModule] = self.text_encoder_loras + self.unet_loras
        for lora in loras:
            org_module = lora.org_module_ref[0]
            if not hasattr(org_module, "_lora_org_weight"):
                sd = org_module.state_dict()
                org_module._lora_org_weight = sd["weight"].detach().clone()
                org_module._lora_restored = True

    def restore_weights(self):
        loras: List[LoRAInfModule] = self.text_encoder_loras + self.unet_loras
        for lora in loras:
            org_module = lora.org_module_ref[0]
            if not org_module._lora_restored:
                sd = org_module.state_dict()
                sd["weight"] = org_module._lora_org_weight
                org_module.load_state_dict(sd)
                org_module._lora_restored = True

    def pre_calculation(self):
        loras: List[LoRAInfModule] = self.text_encoder_loras + self.unet_loras
        for lora in loras:
            org_module = lora.org_module_ref[0]
            sd = org_module.state_dict()

            org_weight = sd["weight"]
            lora_weight = lora.get_weight().to(org_weight.device, dtype=org_weight.dtype)
            sd["weight"] = org_weight + lora_weight
            assert sd["weight"].shape == org_weight.shape
            org_module.load_state_dict(sd)

            org_module._lora_restored = False
            lora.enabled = False

    def apply_max_norm_regularization(self, max_norm_value, device):
        downkeys = []
        upkeys = []
        alphakeys = []
        norms = []
        keys_scaled = 0

        state_dict = self.state_dict()
        for key in state_dict.keys():
            if "lora_down" in key and "weight" in key:
                downkeys.append(key)
                upkeys.append(key.replace("lora_down", "lora_up"))
                alphakeys.append(key.replace("lora_down.weight", "alpha"))

        for i in range(len(downkeys)):
            down = state_dict[downkeys[i]].to(device)
            up = state_dict[upkeys[i]].to(device)
            alpha = state_dict[alphakeys[i]].to(device)
            dim = down.shape[0]
            scale = alpha / dim

            if up.shape[2:] == (1, 1) and down.shape[2:] == (1, 1):
                updown = (up.squeeze(2).squeeze(2) @ down.squeeze(2).squeeze(2)).unsqueeze(2).unsqueeze(3)
            elif up.shape[2:] == (3, 3) or down.shape[2:] == (3, 3):
                updown = torch.nn.functional.conv2d(down.permute(1, 0, 2, 3), up).permute(1, 0, 2, 3)
            else:
                updown = up @ down

            updown *= scale

            norm = updown.norm().clamp(min=max_norm_value / 2)
            desired = torch.clamp(norm, max=max_norm_value)
            ratio = desired.cpu() / norm.cpu()
            sqrt_ratio = ratio**0.5
            if ratio != 1:
                keys_scaled += 1
                state_dict[upkeys[i]] *= sqrt_ratio
                state_dict[downkeys[i]] *= sqrt_ratio
            scalednorm = updown.norm() * ratio
            norms.append(scalednorm.item())

        return keys_scaled, sum(norms) / len(norms), max(norms)