import tqdm
from typing import List, Tuple
from .base import BaseAWQForCausalLM
from awq.modules.fused.block import LlamaLikeBlock
from awq.modules.fused.model import LlamaLikeModel
from transformers.models.llama.modeling_llama import (
    LlamaDecoderLayer as OldLlamaDecoderLayer,
)
from awq.modules.fused.norm import FasterTransformerRMSNorm


class BaichuanAWQForCausalLM(BaseAWQForCausalLM):
    layer_type = "BaichuanLayer"
    max_seq_len_key = "model_max_length"

    @staticmethod
    def fuse_layers(model):
        fuser = BaichuanFuser(model)
        fuser.fuse_transformer()

    @staticmethod
    def get_model_layers(model):
        return model.model.layers

    @staticmethod
    def get_act_for_scaling(module):
        return dict(is_scalable=False)

    @staticmethod
    def move_embed(model, device: str):
        model.model.embed_tokens = model.model.embed_tokens.to(device)

    @staticmethod
    # def get_layers_for_scaling(module: OldLlamaDecoderLayer, input_feat, module_kwargs):
    def get_layers_for_scaling(module, input_feat, module_kwargs):
        layers = []

        # attention input
        layers.append(
            dict(
                prev_op=module.input_layernorm,
                layers=[module.self_attn.W_pack],
                inp=input_feat["self_attn.W_pack"],
                module2inspect=module.self_attn,
                kwargs=module_kwargs,
            )
        )

        # # attention out
        # # Please refer to https://github.com/mit-han-lab/llm-awq/pull/67#issue-1850622696
        # if module.self_attn.v_proj.weight.shape == module.self_attn.o_proj.weight.shape:
        #     layers.append(dict(
        #         prev_op=module.self_attn.v_proj,
        #         layers=[module.self_attn.o_proj],
        #         inp=input_feat['self_attn.o_proj'],
        #     ))

        # attention out
        # Please refer to https://github.com/mit-han-lab/llm-awq/pull/67#issue-1850622696
        layers.append(
            dict(
                prev_op=module.self_attn.W_pack,
                layers=[module.self_attn.o_proj],
                inp=input_feat["self_attn.o_proj"],
            )
        )

        # linear 1
        layers.append(
            dict(
                prev_op=module.post_attention_layernorm,
                layers=[module.mlp.gate_proj, module.mlp.up_proj],
                inp=input_feat["mlp.gate_proj"],
                module2inspect=module.mlp,
            )
        )

        # linear 2
        layers.append(
            dict(
                prev_op=module.mlp.up_proj,
                layers=[module.mlp.down_proj],
                inp=input_feat["mlp.down_proj"],
            )
        )

        return layers


class BaichuanFuser:
    def __init__(self, model):
        self.model = model

        self.llama_blocks: List[Tuple[str, OldLlamaDecoderLayer]] = [
            (name, module)
            for name, module in self.model.named_modules()
            if "LlamaDecoderLayer".lower() in module.__class__.__name__.lower()
        ]

    def fuse_transformer(self):
        blocks = []

        for module in tqdm.tqdm(self.model.model.layers, desc="Fusing layers..."):
            device = next(iter(module.state_dict().values())).device
            # qkv = fuse_qkv(
            #     module,
            #     module.self_attn.q_proj,
            #     module.self_attn.k_proj,
            #     module.self_attn.v_proj
            # )
            qkv = module.self_attn.W_pack
            norm_1 = FasterTransformerRMSNorm(
                module.input_layernorm.weight, module.input_layernorm.epsilon
            )
            norm_2 = FasterTransformerRMSNorm(
                module.post_attention_layernorm.weight,
                module.post_attention_layernorm.epsilon,
            )
            blocks.append(
                LlamaLikeBlock(
                    hidden_size=self.model.config.hidden_size,
                    n_heads=self.model.config.num_attention_heads,
                    n_kv_heads=self.model.config.num_attention_heads,
                    qkv_layer=qkv,
                    o_proj=module.self_attn.o_proj,
                    mlp=module.mlp,
                    norm_1=norm_1,
                    norm_2=norm_2,
                    dev=device,
                    max_seq_len=self.model.config.max_seq_len,
                    use_alibi=True,
                )
            )

        self.model.model = LlamaLikeModel(
            self.model.config.vocab_size,
            blocks,
            self.model.model.embed_tokens,
            self.model.model.norm,
        )

        setattr(self.model.model, "blocks", self.model.model.blocks)
