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import gc
import logging
from utils.dataset import cycle
from utils.dataset import LatentLMDBDataset
from utils.distributed import EMA_FSDP, fsdp_wrap, fsdp_state_dict, launch_distributed_job
from utils.misc import (
    set_seed,
    merge_dict_list
)
import torch.distributed as dist
from omegaconf import OmegaConf
import torch
import wandb
import time
import os
from model import NaiveConsistency



class Trainer:
    def __init__(self, config):
        self.config = config
        self.step = 0

        # Step 1: Initialize the distributed training environment (rank, seed, dtype, logging etc.)
        torch.backends.cuda.matmul.allow_tf32 = True
        torch.backends.cudnn.allow_tf32 = True

        launch_distributed_job()
        global_rank = dist.get_rank()
        self.world_size = dist.get_world_size()

        self.dtype = torch.bfloat16 if config.mixed_precision else torch.float32
        self.device = torch.cuda.current_device()
        self.is_main_process = global_rank == 0
        self.causal = config.causal
        self.disable_wandb = config.disable_wandb

        # use a random seed for the training
        if config.seed == 0:
            random_seed = torch.randint(0, 10000000, (1,), device=self.device)
            dist.broadcast(random_seed, src=0)
            config.seed = random_seed.item()

        set_seed(config.seed + global_rank)

        if self.is_main_process and not self.disable_wandb:
            wandb.login(host=config.wandb_host, key=config.wandb_key)
            wandb.init(
                config=OmegaConf.to_container(config, resolve=True),
                name=config.config_name,
                mode="online",
                entity=config.wandb_entity,
                project=config.wandb_project,
                dir=config.wandb_save_dir
            )

        self.output_path = config.logdir

        # Step 2: Initialize the model and optimizer
        self.model = NaiveConsistency(config, device=self.device)

        self.model.generator = fsdp_wrap(
            self.model.generator,
            sharding_strategy=config.sharding_strategy,
            mixed_precision=config.mixed_precision,
            wrap_strategy=config.generator_fsdp_wrap_strategy,
            cpu_offload=True
        )
        
        self.model.generator_ema = fsdp_wrap(
            self.model.generator_ema,
            sharding_strategy=config.sharding_strategy,
            mixed_precision=config.mixed_precision,
            wrap_strategy=config.generator_fsdp_wrap_strategy,
            cpu_offload=True
        )

        self.model.teacher = fsdp_wrap(
            self.model.teacher,
            sharding_strategy=config.sharding_strategy,
            mixed_precision=config.mixed_precision,
            wrap_strategy=config.real_score_fsdp_wrap_strategy,
            cpu_offload=True
        )

        self.model.text_encoder = fsdp_wrap(
            self.model.text_encoder,
            sharding_strategy=config.sharding_strategy,
            mixed_precision=config.mixed_precision,
            wrap_strategy=config.text_encoder_fsdp_wrap_strategy,
            cpu_offload=True
        )

        
        self.generator_optimizer = torch.optim.AdamW(
            [param for param in self.model.generator.parameters()
             if param.requires_grad],
            lr=config.lr,
            betas=(config.beta1, config.beta2),
            weight_decay=config.weight_decay
        )

        self.generator_ema = EMA_FSDP(self.model.generator, decay=self.config.ema_weight)
        
        # Step 3: Initialize the dataloader
 
        dataset = LatentLMDBDataset(
            config.data_path, max_pair=int(1e8))
        
        sampler = torch.utils.data.distributed.DistributedSampler(
            dataset, shuffle=True, drop_last=True)
        dataloader = torch.utils.data.DataLoader(
            dataset,
            batch_size=config.batch_size,
            sampler=sampler,
            num_workers=8)

        if dist.get_rank() == 0:
            print("DATASET SIZE %d" % len(dataset))
        self.dataloader = cycle(dataloader)

        
        ##############################################################################################################
        # 6. Set up EMA parameter containers
        rename_param = (
            lambda name: name.replace("_fsdp_wrapped_module.", "")
            .replace("_checkpoint_wrapped_module.", "")
            .replace("_orig_mod.", "")
        )
        self.name_to_trainable_params = {}
        for n, p in self.model.generator.named_parameters():
            if not p.requires_grad:
                continue

            renamed_n = rename_param(n)
            self.name_to_trainable_params[renamed_n] = p
        ema_weight = config.ema_weight
        self.generator_ema = None
        if (ema_weight is not None) and (ema_weight > 0.0):
            print(f"Setting up EMA with weight {ema_weight}")
            self.generator_ema = EMA_FSDP(self.model.generator, decay=ema_weight)

        ##############################################################################################################
        # 7. Load the causal diffusion model as the teacher model
        if getattr(config, "generator_ckpt", False):
            print(f"Loading pretrained generator from {config.generator_ckpt}")
            state_dict = torch.load(config.generator_ckpt, map_location="cpu")
            if "generator" in state_dict:
                state_dict = state_dict["generator"]
                fixed = {}
                for k, v in state_dict.items():
                    if k.startswith("model._fsdp_wrapped_module."):
                        k = k.replace("model._fsdp_wrapped_module.", "model.", 1)
                    fixed[k] = v
                state_dict = fixed
            elif "model" in state_dict:
                state_dict = state_dict["model"]
            elif "generator_ema" in state_dict:
                gen_sd = state_dict["generator_ema"]
                fixed = {}
                for k, v in gen_sd.items():
                    if k.startswith("model._fsdp_wrapped_module."):
                        k = k.replace("model._fsdp_wrapped_module.", "model.", 1)
                    fixed[k] = v
                state_dict = fixed
                
                
            self.model.generator.load_state_dict(
                state_dict, strict=True
            )
            self.model.teacher.load_state_dict(
                state_dict, strict=True
            )

        #############################################################################################################
        self.max_grad_norm_generator = getattr(config, "max_grad_norm_generator", 10.0)
        self.max_grad_norm_critic = getattr(config, "max_grad_norm_critic", 10.0)
        self.previous_time = None
        
        

    def save(self):
        print("Start gathering distributed model states...")
        generator_state_dict = fsdp_state_dict(
            self.model.generator)

        if self.config.ema_start_step < self.step:
            state_dict = {
                "generator_ema": self.generator_ema.full_state_dict(self.model.generator),
            }
        else:
            state_dict = {
                "generator": generator_state_dict,
            }

        if self.is_main_process:
            os.makedirs(os.path.join(self.output_path,
                        f"checkpoint_model_{self.step:06d}"), exist_ok=True)
            torch.save(state_dict, os.path.join(self.output_path,
                       f"checkpoint_model_{self.step:06d}", "model.pt"))
            print("Model saved to", os.path.join(self.output_path,
                  f"checkpoint_model_{self.step:06d}", "model.pt"))

            
    def fwdbwd_one_step(self, batch, clean_latent=None):
        self.model.eval()

        if self.step % 20 == 0:
            torch.cuda.empty_cache()

        # Step 1: Get the next batch of text prompts
        text_prompts = batch["prompts"]
        batch_size = len(text_prompts)
        image_or_video_shape = list(self.config.image_or_video_shape)
        image_or_video_shape[0] = batch_size

        # Step 2: Extract the conditional infos
        with torch.no_grad():
            conditional_dict = self.model.text_encoder(
                text_prompts=text_prompts)

            if not getattr(self, "unconditional_dict", None):
                unconditional_dict = self.model.text_encoder(
                    text_prompts=[self.config.negative_prompt] * batch_size)
                unconditional_dict = {k: v.detach()
                                      for k, v in unconditional_dict.items()}
                self.unconditional_dict = unconditional_dict  # cache the unconditional_dict
            else:
                unconditional_dict = self.unconditional_dict

        # Step 3: Store gradients for the generator (if training the generator)
        generator_loss, generator_log_dict = self.model.generator_loss(
            conditional_dict=conditional_dict,
            unconditional_dict=unconditional_dict,
            clean_latent=clean_latent,
            ema_model = self.generator_ema
        )
        generator_loss.backward()
        generator_grad_norm = self.model.generator.clip_grad_norm_(
            self.max_grad_norm_generator)

        generator_log_dict.update({"generator_loss": generator_loss,
                                    "generator_grad_norm": generator_grad_norm})

        return generator_log_dict
        

   

    def train(self):
        start_step = self.step

        while True:

            self.generator_optimizer.zero_grad(set_to_none=True)

            batch = next(self.dataloader)
            generator_log_dict = self.fwdbwd_one_step(batch, clean_latent=batch["clean_latent"])
            

            self.generator_optimizer.step()
            if self.generator_ema is not None:
                self.generator_ema.update(self.model.generator)
            
              

            # Increment the step since we finished gradient update
            self.step += 1

           
            # Save the model
            if (not self.config.no_save) and (self.step - start_step) > 0 and self.step % self.config.log_iters == 0:
                torch.cuda.empty_cache()
                self.save()
                torch.cuda.empty_cache()

            # Logging
            if self.is_main_process:
                wandb_loss_dict = {}
                wandb_loss_dict.update(
                        {
                            "generator_loss": generator_log_dict["generator_loss"].mean().item(),
                            "generator_grad_norm": generator_log_dict["generator_grad_norm"].mean().item()
                        }
                    )

              

                if not self.disable_wandb:
                    wandb.log(wandb_loss_dict, step=self.step)

            if self.step % self.config.gc_interval == 0:
                if dist.get_rank() == 0:
                    logging.info("DistGarbageCollector: Running GC.")
                gc.collect()
                torch.cuda.empty_cache()

            if self.is_main_process:
                current_time = time.time()
                if self.previous_time is None:
                    self.previous_time = current_time
                else:
                    if not self.disable_wandb:
                        wandb.log({"per iteration time": current_time - self.previous_time}, step=self.step)
                    self.previous_time = current_time

	import gc
	import logging
	from utils.dataset import cycle
	from utils.dataset import LatentLMDBDataset
	from utils.distributed import EMA_FSDP, fsdp_wrap, fsdp_state_dict, launch_distributed_job
	from utils.misc import (
	set_seed,
	merge_dict_list
	)
	import torch.distributed as dist
	from omegaconf import OmegaConf
	import torch
	import wandb
	import time
	import os
	from model import NaiveConsistency



	class Trainer:
	def __init__(self, config):
	self.config = config
	self.step = 0

	# Step 1: Initialize the distributed training environment (rank, seed, dtype, logging etc.)
	torch.backends.cuda.matmul.allow_tf32 = True
	torch.backends.cudnn.allow_tf32 = True

	launch_distributed_job()
	global_rank = dist.get_rank()
	self.world_size = dist.get_world_size()

	self.dtype = torch.bfloat16 if config.mixed_precision else torch.float32
	self.device = torch.cuda.current_device()
	self.is_main_process = global_rank == 0
	self.causal = config.causal
	self.disable_wandb = config.disable_wandb

	# use a random seed for the training
	if config.seed == 0:
	random_seed = torch.randint(0, 10000000, (1,), device=self.device)
	dist.broadcast(random_seed, src=0)
	config.seed = random_seed.item()

	set_seed(config.seed + global_rank)

	if self.is_main_process and not self.disable_wandb:
	wandb.login(host=config.wandb_host, key=config.wandb_key)
	wandb.init(
	config=OmegaConf.to_container(config, resolve=True),
	name=config.config_name,
	mode="online",
	entity=config.wandb_entity,
	project=config.wandb_project,
	dir=config.wandb_save_dir
	)

	self.output_path = config.logdir

	# Step 2: Initialize the model and optimizer
	self.model = NaiveConsistency(config, device=self.device)

	self.model.generator = fsdp_wrap(
	self.model.generator,
	sharding_strategy=config.sharding_strategy,
	mixed_precision=config.mixed_precision,
	wrap_strategy=config.generator_fsdp_wrap_strategy,
	cpu_offload=True
	)

	self.model.generator_ema = fsdp_wrap(
	self.model.generator_ema,
	sharding_strategy=config.sharding_strategy,
	mixed_precision=config.mixed_precision,
	wrap_strategy=config.generator_fsdp_wrap_strategy,
	cpu_offload=True
	)

	self.model.teacher = fsdp_wrap(
	self.model.teacher,
	sharding_strategy=config.sharding_strategy,
	mixed_precision=config.mixed_precision,
	wrap_strategy=config.real_score_fsdp_wrap_strategy,
	cpu_offload=True
	)

	self.model.text_encoder = fsdp_wrap(
	self.model.text_encoder,
	sharding_strategy=config.sharding_strategy,
	mixed_precision=config.mixed_precision,
	wrap_strategy=config.text_encoder_fsdp_wrap_strategy,
	cpu_offload=True
	)


	self.generator_optimizer = torch.optim.AdamW(
	[param for param in self.model.generator.parameters()
	if param.requires_grad],
	lr=config.lr,
	betas=(config.beta1, config.beta2),
	weight_decay=config.weight_decay
	)

	self.generator_ema = EMA_FSDP(self.model.generator, decay=self.config.ema_weight)

	# Step 3: Initialize the dataloader

	dataset = LatentLMDBDataset(
	config.data_path, max_pair=int(1e8))

	sampler = torch.utils.data.distributed.DistributedSampler(
	dataset, shuffle=True, drop_last=True)
	dataloader = torch.utils.data.DataLoader(
	dataset,
	batch_size=config.batch_size,
	sampler=sampler,
	num_workers=8)

	if dist.get_rank() == 0:
	print("DATASET SIZE %d" % len(dataset))
	self.dataloader = cycle(dataloader)


	##############################################################################################################
	# 6. Set up EMA parameter containers
	rename_param = (
	lambda name: name.replace("_fsdp_wrapped_module.", "")
	.replace("_checkpoint_wrapped_module.", "")
	.replace("_orig_mod.", "")
	)
	self.name_to_trainable_params = {}
	for n, p in self.model.generator.named_parameters():
	if not p.requires_grad:
	continue

	renamed_n = rename_param(n)
	self.name_to_trainable_params[renamed_n] = p
	ema_weight = config.ema_weight
	self.generator_ema = None
	if (ema_weight is not None) and (ema_weight > 0.0):
	print(f"Setting up EMA with weight {ema_weight}")
	self.generator_ema = EMA_FSDP(self.model.generator, decay=ema_weight)

	##############################################################################################################
	# 7. Load the causal diffusion model as the teacher model
	if getattr(config, "generator_ckpt", False):
	print(f"Loading pretrained generator from {config.generator_ckpt}")
	state_dict = torch.load(config.generator_ckpt, map_location="cpu")
	if "generator" in state_dict:
	state_dict = state_dict["generator"]
	fixed = {}
	for k, v in state_dict.items():
	if k.startswith("model._fsdp_wrapped_module."):
	k = k.replace("model._fsdp_wrapped_module.", "model.", 1)
	fixed[k] = v
	state_dict = fixed
	elif "model" in state_dict:
	state_dict = state_dict["model"]
	elif "generator_ema" in state_dict:
	gen_sd = state_dict["generator_ema"]
	fixed = {}
	for k, v in gen_sd.items():
	if k.startswith("model._fsdp_wrapped_module."):
	k = k.replace("model._fsdp_wrapped_module.", "model.", 1)
	fixed[k] = v
	state_dict = fixed


	self.model.generator.load_state_dict(
	state_dict, strict=True
	)
	self.model.teacher.load_state_dict(
	state_dict, strict=True
	)

	#############################################################################################################
	self.max_grad_norm_generator = getattr(config, "max_grad_norm_generator", 10.0)
	self.max_grad_norm_critic = getattr(config, "max_grad_norm_critic", 10.0)
	self.previous_time = None



	def save(self):
	print("Start gathering distributed model states...")
	generator_state_dict = fsdp_state_dict(
	self.model.generator)

	if self.config.ema_start_step < self.step:
	state_dict = {
	"generator_ema": self.generator_ema.full_state_dict(self.model.generator),
	}
	else:
	state_dict = {
	"generator": generator_state_dict,
	}

	if self.is_main_process:
	os.makedirs(os.path.join(self.output_path,
	f"checkpoint_model_{self.step:06d}"), exist_ok=True)
	torch.save(state_dict, os.path.join(self.output_path,
	f"checkpoint_model_{self.step:06d}", "model.pt"))
	print("Model saved to", os.path.join(self.output_path,
	f"checkpoint_model_{self.step:06d}", "model.pt"))


	def fwdbwd_one_step(self, batch, clean_latent=None):
	self.model.eval()

	if self.step % 20 == 0:
	torch.cuda.empty_cache()

	# Step 1: Get the next batch of text prompts
	text_prompts = batch["prompts"]
	batch_size = len(text_prompts)
	image_or_video_shape = list(self.config.image_or_video_shape)
	image_or_video_shape[0] = batch_size

	# Step 2: Extract the conditional infos
	with torch.no_grad():
	conditional_dict = self.model.text_encoder(
	text_prompts=text_prompts)

	if not getattr(self, "unconditional_dict", None):
	unconditional_dict = self.model.text_encoder(
	text_prompts=[self.config.negative_prompt] * batch_size)
	unconditional_dict = {k: v.detach()
	for k, v in unconditional_dict.items()}
	self.unconditional_dict = unconditional_dict # cache the unconditional_dict
	else:
	unconditional_dict = self.unconditional_dict

	# Step 3: Store gradients for the generator (if training the generator)
	generator_loss, generator_log_dict = self.model.generator_loss(
	conditional_dict=conditional_dict,
	unconditional_dict=unconditional_dict,
	clean_latent=clean_latent,
	ema_model = self.generator_ema
	)
	generator_loss.backward()
	generator_grad_norm = self.model.generator.clip_grad_norm_(
	self.max_grad_norm_generator)

	generator_log_dict.update({"generator_loss": generator_loss,
	"generator_grad_norm": generator_grad_norm})

	return generator_log_dict




	def train(self):
	start_step = self.step

	while True:

	self.generator_optimizer.zero_grad(set_to_none=True)

	batch = next(self.dataloader)
	generator_log_dict = self.fwdbwd_one_step(batch, clean_latent=batch["clean_latent"])


	self.generator_optimizer.step()
	if self.generator_ema is not None:
	self.generator_ema.update(self.model.generator)



	# Increment the step since we finished gradient update
	self.step += 1


	# Save the model
	if (not self.config.no_save) and (self.step - start_step) > 0 and self.step % self.config.log_iters == 0:
	torch.cuda.empty_cache()
	self.save()
	torch.cuda.empty_cache()

	# Logging
	if self.is_main_process:
	wandb_loss_dict = {}
	wandb_loss_dict.update(
	{
	"generator_loss": generator_log_dict["generator_loss"].mean().item(),
	"generator_grad_norm": generator_log_dict["generator_grad_norm"].mean().item()
	}
	)



	if not self.disable_wandb:
	wandb.log(wandb_loss_dict, step=self.step)

	if self.step % self.config.gc_interval == 0:
	if dist.get_rank() == 0:
	logging.info("DistGarbageCollector: Running GC.")
	gc.collect()
	torch.cuda.empty_cache()

	if self.is_main_process:
	current_time = time.time()
	if self.previous_time is None:
	self.previous_time = current_time
	else:
	if not self.disable_wandb:
	wandb.log({"per iteration time": current_time - self.previous_time}, step=self.step)
	self.previous_time = current_time