import argparse
from pathlib import Path
from scgpt.tokenizer import GeneVocab, random_mask_value
import sys
from datasets import Dataset, load_dataset
import os

sys.path.insert(0, "../")

parser = argparse.ArgumentParser()
parser.add_argument(
    "-d",
    "--data-source",
    type=str,
    required=True,
    help='The name of the data source (currently support "scvi" datasets), or the '
    "path to the data file.",
)
parser.add_argument(
    "-s",
    "--save-dir",
    type=str,
    required=True,
    help="The directory to save the trained model and the results.",
)
parser.add_argument(
    "--load-model",
    type=str,
    default=None,
    help="The directory containing the model and configs to load and continue training.",
)

# settings for data
parser.add_argument(
    "--n-hvg",
    type=int,
    default=None,
    help="The number of highly variable genes. If set to 0, will use all genes. "
    "Default is None, which will determine the n_hvg automatically.",
)
parser.add_argument(
    "--valid-size-or-ratio",
    type=float,
    default=0.1,
    help="The ratio or size of the validation set size if split the dataset. "
    "If value is between 0 and 1, will be parsed as the ratio. If value is "
    "greater than 1 and be an integer, will be parsed as the size. If value "
    "is 0, will not split the dataset.",
)

parser.add_argument(
    "--grad-accu-steps",
    type=int,
    default=1,
    help="The number of gradient accumulation steps. Default is 1.",
)

# settings for tokenizer
parser.add_argument(
    "--pad-token",
    type=str,
    default="<pad>",
    help="The token to use for padding. Default is <pad>.",
)
parser.add_argument(
    "--input-style",
    type=str,
    choices=["normed_raw", "log1p", "binned"],
    default="binned",
    help="The style of the input data. Default is binned.",
)
parser.add_argument(
    "--input-emb-style",
    type=str,
    choices=["category", "continuous", "scaling"],
    default="continuous",
    help="The style of the input embedding. Default is continuous.",
)
parser.add_argument(
    "--n-bins",
    type=int,
    default=51,
    help="The number of bins to use for the binned input style. Default is 51.",
)
parser.add_argument(
    "--max-seq-len",
    type=int,
    default=1536,
    help="The maximum length of the sequence. Default is 1000. The actual used "
    "max length would be the minimum of this value and the length of the longest "
    "sequence in the data.",
)
# omit the args for MLM and MVC, will always use them by default
parser.add_argument(
    "--training-tasks",  #  choices of "mlm", "gen", "both"
    type=str,
    default="both",
    choices=["pcpt", "gen", "both"],
    help="The tasks to use for training. pcpt: perception training with maked token "
    "learning. gen: generation. Default is both.",
)
parser.add_argument(
    "--mask-ratio",
    type=float,
    default=0.40,
    help="The ratio of masked values in the training data. Default is 0.40. This"
    "value will be ignored if --training-tasks is set to gen or both.",
)
parser.add_argument(
    "--trunc-by-sample",
    action="store_true",
    help="Whether to truncate the input by sampling rather than cutting off if "
    "sequence length > max_seq_length. Default is False.",
)
parser.add_argument(
    "--vocab-path",
    type=str,
    help="Path to the vocabulary file.",
)
# settings for training
parser.add_argument(
    "--local-rank",
    type=int,
    default=-1,
    help="The local rank of the process for using the torch.distributed.launch "
    "utility. Will be -1 if not running in distributed model.",
)
parser.add_argument(
    "--batch-size",
    type=int,
    default=32,
    help="The batch size for training. Default is 32.",
)
parser.add_argument(
    "--eval-batch-size",
    type=int,
    default=32,
    help="The batch size for evaluation. Default is 32.",
)
parser.add_argument(
    "--epochs",
    type=int,
    default=10,
    help="The number of epochs for training.",
)
parser.add_argument(
    "--lr",
    type=float,
    default=1e-3,
    help="The learning rate for training. Default is 1e-3.",
)
parser.add_argument(
    "--scheduler-interval",
    type=int,
    default=100,
    help="The interval iterations for updating the learning rate. Default is 100. "
    "This will only be used when warmup-ratio is 0.",
)
parser.add_argument(
    "--scheduler-factor",
    type=float,
    default=0.99,
    help="The factor for updating the learning rate. Default is 0.99. "
    "This will only be used when warmup-ratio is 0.",
)
parser.add_argument(
    "--warmup-ratio-or-step",
    type=float,
    default=0.1,
    help="The ratio of warmup steps out of the total training steps. Default is 0.1. "
    "If warmup-ratio is above 0, will use a cosine scheduler with warmup. If "
    "the value is above 1, will use it as the number of warmup steps.",
)
parser.add_argument(
    "--no-cls",
    action="store_true",
    help="Whether to deactivate the classification loss. Default is False.",
)
parser.add_argument(
    "--no-cce",
    action="store_true",
    help="Whether to deactivate the contrastive cell embedding objective. "
    "Default is False.",
)
parser.add_argument(
    "--fp16",
    action="store_true",
    help="Whether to train in automatic mixed precision. Default is False.",
)
parser.add_argument(
    "--fast-transformer",
    type=bool,
    default=True,
    help="Whether to use the fast transformer. Default is True.",
)

# settings for model
parser.add_argument(
    "--nlayers",
    type=int,
    default=4,
    help="The number of layers for the transformer. Default is 4.",
)
parser.add_argument(
    "--nheads",
    type=int,
    default=4,
    help="The number of heads for the transformer. Default is 4.",
)
parser.add_argument(
    "--embsize",
    type=int,
    default=64,
    help="The embedding size for the transformer. Default is 64.",
)
parser.add_argument(
    "--d-hid",
    type=int,
    default=64,
    help="dimension of the feedforward network model in the transformer. "
    "Default is 64.",
)
parser.add_argument(
    "--dropout",
    type=float,
    default=0.2,
    help="The dropout rate. Default is 0.2.",
)
parser.add_argument(
    "--n-layers-cls",
    type=int,
    default=3,
    help="The number of layers for the classification network, including the "
    "output layer. Default is 3.",
)

# settings for logging
parser.add_argument(
    "--log-interval",
    type=int,
    default=100,
    help="The interval for logging. Default is 100.",
)
parser.add_argument(
    "--save-interval",
    type=int,
    default=1000,
    help="The interval for saving the model. Default is 1000.",
)

args = parser.parse_args()
# args.pad_value = -2

if args.input_style == "binned":
    if args.input_emb_style == "scaling":
        raise ValueError("input_emb_style `scaling` is not supported for binned input.")
elif args.input_style == "log1p" or args.input_style == "normed_raw":
    if args.input_emb_style == "category":
        raise ValueError(
            "input_emb_style `category` is not supported for log1p or normed_raw input."
        )

if args.input_emb_style == "category":
    args.mask_value = args.n_bins + 1
    args.pad_value = args.n_bins  # for padding gene expr values
    n_input_bins = args.n_bins + 2
else:
    args.mask_value = -1
    args.pad_value = -2
    n_input_bins = args.n_bins


def _map_append_cls(dataset: Dataset) -> Dataset:
    dataset = dataset.map(
        lambda example: {
            "genes": [vocab["<cls>"]] + example["genes"],
            "expressions": [args.pad_value] + example["expressions"],
        },
        # batched=True,  # not using since then the map func needs to loop
        num_proc=len(os.sched_getaffinity(0)),
    )

    return dataset


special_tokens = [args.pad_token, "<cls>", "<eoc>"]

parquet_files = [str(f) for f in Path(args.data_source).glob("*.parquet")]
cache_dir = Path(args.data_source).parent / "cache"
vocab = GeneVocab.from_file(Path(args.vocab_path))
for s in special_tokens:
    if s not in vocab:
        vocab.append_token(s)


# load or make the dataset w/ <cls> appended at the beginning
cls_prefix_datatable = Path(args.data_source) / "cls_prefix_data.parquet"
if not cls_prefix_datatable.exists():
    print("preparing cls prefix dataset")
    raw_dataset = load_dataset(
        "parquet",
        data_files=parquet_files,
        split="train",
        cache_dir=str(cache_dir),
    )
    raw_dataset = _map_append_cls(raw_dataset)
    raw_dataset.to_parquet(str(cls_prefix_datatable))
raw_dataset = load_dataset(
    "parquet",
    data_files=str(cls_prefix_datatable),
    split="train",
    cache_dir=str(cache_dir),
)

# others, pancreas, lung, kidney, heart, blood