#!/usr/bin/env python3
"""Train MapGS.

Examples
--------
    python scripts/train.py --config configs/synthetic_smoke.yaml
    python scripts/train.py --config configs/waymo_stage1.yaml --override train.batch_size=8
"""

import argparse

from mapgs.config import load_config
from mapgs.data import build_dataset
from mapgs.train import Trainer


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--config", type=str, default=None)
    ap.add_argument("--override", nargs="*", default=[], help="dotted overrides a.b=c")
    ap.add_argument("--max-iters", type=int, default=None)
    ap.add_argument("--resume", type=str, default=None)
    args = ap.parse_args()

    cfg = load_config(args.config, args.override)
    dataset = build_dataset(cfg, "train")
    trainer = Trainer(cfg)
    if args.resume or cfg.train.resume:
        trainer.load(args.resume or cfg.train.resume)
    trainer.fit(dataset, max_iters=args.max_iters)
    trainer.save(f"{cfg.train.out_dir}/ckpt_final.pt")
    print(f"saved final checkpoint to {cfg.train.out_dir}/ckpt_final.pt")


if __name__ == "__main__":
    main()