import argparse
import logging
import os
import sys
from io import BytesIO
from collections.abc import Sequence
import torch
import hydra
from omegaconf import DictConfig, OmegaConf
from funasr.torch_utils.set_all_random_seed import set_all_random_seed
# from funasr.model_class_factory1 import model_choices
from funasr.modules.lora.utils import mark_only_lora_as_trainable
from funasr.optimizers import optim_choices
from funasr.schedulers import scheduler_choices
from funasr.torch_utils.load_pretrained_model import load_pretrained_model
from funasr.torch_utils.initialize import initialize
from funasr.datasets.data_sampler import BatchSampler
# from funasr.tokenizer.build_tokenizer import build_tokenizer
# from funasr.tokenizer.token_id_converter import TokenIDConverter
from funasr.tokenizer.funtoken import build_tokenizer
from funasr.datasets.dataset_jsonl import AudioDataset
from funasr.cli.trainer import Trainer
# from funasr.utils.load_fr_py import load_class_from_path
from funasr.utils.dynamic_import import dynamic_import
import torch.distributed as dist
from torch.nn.parallel import DistributedDataParallel as DDP
from torch.distributed.fsdp import FullyShardedDataParallel as FSDP


def preprocess_config(cfg: DictConfig):
	for key, value in cfg.items():
		if value == 'None':
			cfg[key] = None



@hydra.main()
def main(kwargs: DictConfig):
	# preprocess_config(kwargs)
	# import pdb; pdb.set_trace()
	# set random seed
	set_all_random_seed(kwargs.get("seed", 0))
	torch.backends.cudnn.enabled = kwargs.get("cudnn_enabled", torch.backends.cudnn.enabled)
	torch.backends.cudnn.benchmark = kwargs.get("cudnn_benchmark", torch.backends.cudnn.benchmark)
	torch.backends.cudnn.deterministic = kwargs.get("cudnn_deterministic", True)
	
	local_rank = int(os.environ.get('LOCAL_RANK', 0))
	# Check if we are using DDP or FSDP
	use_ddp = 'WORLD_SIZE' in os.environ and os.environ["WORLD_SIZE"] > 1
	use_fsdp = kwargs.get("use_fsdp", None)
	if use_ddp or use_fsdp:
		dist.init_process_group(backend=kwargs.get("backend", "nccl"), init_method='env://')
		torch.cuda.set_device(local_rank)
	
	
	# build_tokenizer
	tokenizer = build_tokenizer(
		token_type=kwargs.get("token_type", "char"),
		bpemodel=kwargs.get("bpemodel", None),
		delimiter=kwargs.get("delimiter", None),
		space_symbol=kwargs.get("space_symbol", "<space>"),
		non_linguistic_symbols=kwargs.get("non_linguistic_symbols", None),
		g2p_type=kwargs.get("g2p_type", None),
		token_list=kwargs.get("token_list", None),
		unk_symbol=kwargs.get("unk_symbol", "<unk>"),
	)

	# import pdb;
	# pdb.set_trace()
	# build model
	# model_class = model_choices.get_class(kwargs.get("model", "asr"))
	# model_class = load_class_from_path(kwargs.get("model").split(":"))
	model_class = dynamic_import(kwargs.get("model"))
	model = model_class(**kwargs, **kwargs["model_conf"], vocab_size=len(tokenizer.token_list))
	frontend = model.frontend
	# init_param
	init_param = kwargs.get("init_param", None)
	if init_param is not None:
		init_param = eval(init_param)
		if isinstance(init_param, Sequence):
			init_param = (init_param,)
		logging.info("init_param is not None: ", init_param)
		for p in init_param:
			logging.info(f"Loading pretrained params from {p}")
			load_pretrained_model(
				model=model,
				init_param=p,
				ignore_init_mismatch=kwargs.get("ignore_init_mismatch", True),
				oss_bucket=kwargs.get("oss_bucket", None),
			)
	else:
		initialize(model, kwargs.get("init", "kaiming_normal"))
	
	# import pdb;
	# pdb.set_trace()
	# freeze_param
	freeze_param = kwargs.get("freeze_param", None)
	if freeze_param is not None:
		freeze_param = eval(freeze_param)
		if isinstance(freeze_param, Sequence):
			freeze_param = (freeze_param,)
		logging.info("freeze_param is not None: ", freeze_param)
		for t in freeze_param:
			for k, p in model.named_parameters():
				if k.startswith(t + ".") or k == t:
					logging.info(f"Setting {k}.requires_grad = False")
					p.requires_grad = False
	

	if use_ddp:
		model = model.cuda(local_rank)
		model = DDP(model, device_ids=[local_rank],
		            find_unused_parameters=kwargs.get("train_conf", {}).get("find_unused_parameters", False))
	elif use_fsdp:
		model = FSDP(model).cuda(local_rank)
	else:
		model = model.to(device=kwargs.get("device", "cuda"))
		
		
	# optim
	optim = kwargs.get("optim", "adam")
	assert optim in optim_choices
	optim_class = optim_choices.get(optim)
	optim = optim_class(model.parameters(), **kwargs.get("optim_conf"))
	
	# scheduler
	scheduler = kwargs.get("scheduler", "warmuplr")
	assert scheduler in scheduler_choices
	scheduler_class = scheduler_choices.get(scheduler)
	scheduler = scheduler_class(optim, **kwargs.get("scheduler_conf"))


	# dataset
	dataset_tr = AudioDataset(kwargs.get("train_data_set_list"), frontend=frontend, tokenizer=tokenizer, **kwargs.get("dataset_conf"))

	# dataloader
	batch_sampler = BatchSampler(dataset_tr, **kwargs.get("dataset_conf"), **kwargs.get("dataset_conf").get("batch_conf"))
	dataloader_tr = torch.utils.data.DataLoader(dataset_tr,
	                                            collate_fn=dataset_tr.collator,
	                                            batch_sampler=batch_sampler,
	                                            num_workers=kwargs.get("num_workers", 0),
	                                            pin_memory=True)

	trainer = Trainer(
	    model=model,
	    optim=optim,
	    scheduler=scheduler,
	    dataloader_train=dataloader_tr,
	    dataloader_val=None,
		local_rank=local_rank,
		use_ddp=use_ddp,
		use_fsdp=use_fsdp,
		**kwargs.get("train_conf"),
	)
	trainer.run()
	
	if use_ddp or use_fsdp:
		torch.distributed.destroy_process_group()

	

if __name__ == "__main__":
	main()