"""训练固定长度曲线正演代理模型。

脚本把命令行超参数整理为 `TrainConfig`，加载预处理后的参数、流量制度和曲线数据，
训练 `ForwardSurrogate` 来直接预测整条重采样压力/导数/斜率曲线，是当前数值试井
代理模型的主训练入口。
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
sys.path.append(str(ROOT))

from src.common.experiment_paths import model_dir_for_tag, normalize_tag, processed_path_for_tag
from src.training.train_forward import TrainConfig, train_forward


def main() -> None:
    """读取训练超参数并训练固定长度曲线正演代理模型。"""
    parser = argparse.ArgumentParser(description="Train forward surrogate model")
    parser.add_argument(
        "--processed",
        type=str,
        default=None,
        help="Processed dataset path",
    )
    parser.add_argument(
        "--output-dir",
        type=str,
        default=None,
        help="Optional model output directory",
    )
    parser.add_argument("--tag", type=str, default=None, help="Experiment tag for auto naming")
    parser.add_argument("--seed", type=int, default=42)
    parser.add_argument("--batch-size", type=int, default=256)
    parser.add_argument("--epochs", type=int, default=220)
    parser.add_argument("--lr", type=float, default=0.001)
    parser.add_argument("--weight-decay", type=float, default=0.0005)
    parser.add_argument("--hidden-dim", type=int, default=256)
    parser.add_argument("--dropout", type=float, default=0.1)

    parser.add_argument("--w-pressure", type=float, default=1.0)
    parser.add_argument("--w-derivative", type=float, default=2.0)
    parser.add_argument("--w-slope", type=float, default=0.0)
    parser.add_argument("--w-bias-pressure", type=float, default=0.15)
    parser.add_argument("--w-bias-derivative", type=float, default=0.05)
    parser.add_argument("--w-derivative-shape", type=float, default=0.10)
    parser.add_argument("--w-autofit-pressure", type=float, default=0.0)
    parser.add_argument("--w-autofit-derivative", type=float, default=0.0)
    parser.add_argument("--huber-beta", type=float, default=0.05)

    parser.add_argument("--use-sample-reweight", action="store_true", default=True)
    parser.add_argument("--sample-reweight-alpha", type=float, default=0.4)
    parser.add_argument("--sample-weight-min", type=float, default=1.0)
    parser.add_argument("--sample-weight-max", type=float, default=2.5)

    parser.add_argument(
        "--no-schedule",
        action="store_true",
        help="Disable the schedule branch and train a parameter-only forward surrogate",
    )

    args = parser.parse_args()

    tag = normalize_tag(args.tag)
    use_schedule = not args.no_schedule
    # processed/model 路径与 tag 绑定，保证预处理、训练和评估脚本默认指向同一实验。
    processed_path = Path(args.processed) if args.processed is not None else processed_path_for_tag(tag)
    output_dir = Path(args.output_dir) if args.output_dir is not None else model_dir_for_tag(tag, use_schedule)

    cfg = TrainConfig(
        processed_path=processed_path,
        output_dir=output_dir,
        seed=args.seed,
        batch_size=args.batch_size,
        epochs=args.epochs,
        lr=args.lr,
        weight_decay=args.weight_decay,
        hidden_dim=args.hidden_dim,
        dropout=args.dropout,
        w_pressure=args.w_pressure,
        w_derivative=args.w_derivative,
        w_slope=args.w_slope,
        w_bias_pressure=args.w_bias_pressure,
        w_bias_derivative=args.w_bias_derivative,
        w_derivative_shape=args.w_derivative_shape,
        w_autofit_pressure=args.w_autofit_pressure,
        w_autofit_derivative=args.w_autofit_derivative,
        huber_beta=args.huber_beta,
        use_sample_reweight=args.use_sample_reweight,
        sample_reweight_alpha=args.sample_reweight_alpha,
        sample_weight_min=args.sample_weight_min,
        sample_weight_max=args.sample_weight_max,
        use_schedule=use_schedule,
    )
    train_forward(cfg)


if __name__ == "__main__":
    main()