"""
Quick verification for Component 5 training pipeline.
Runs a tiny 5-step training smoke test.
"""

from __future__ import annotations

import sys
from pathlib import Path

# Ensure script imports work from project root.
PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from scripts.train_component5 import main as train_main  # noqa: E402


if __name__ == "__main__":
    try:
        # Override CLI args for a tiny smoke test.
        sys.argv = ["verify_component5_training_pipeline.py", "--config", "configs/component5_training_config.yaml"]

        # Patch config on disk for very short run.
        import yaml

        cfg_path = Path("configs/component5_training_config.yaml")
        cfg = yaml.safe_load(cfg_path.read_text(encoding="utf-8"))
        cfg["training"]["max_steps"] = 5
        cfg["training"]["save_every"] = 5
        cfg["training"]["eval_every"] = 5
        cfg["training"]["log_every"] = 1
        cfg["resume"]["resume_from"] = "none"

        tmp_cfg = Path("configs/component5_training_config.verify.yaml")
        tmp_cfg.write_text(yaml.safe_dump(cfg, sort_keys=False), encoding="utf-8")

        sys.argv = ["verify_component5_training_pipeline.py", "--config", str(tmp_cfg)]
        train_main()
        print("")
        print("Component 5 verification passed.")
    except Exception as exc:
        print("Component 5 verification failed.")
        print(f"What went wrong: {exc}")
        print("Fix suggestion: ensure CUDA is available and tokenized dataset path is correct.")
        raise SystemExit(1)