from __future__ import annotations

"""Create 80/20 train/test split from GTA-UAV-LR pair JSONs.

Merges cross-area train+test (33,708 pairs), shuffles deterministically,
and saves new 80/20 split JSONs.

Usage:
    python -m scripts.make_split [--ratio 0.8] [--seed 42]
"""

import argparse
import json
import logging
import random
from pathlib import Path

import coloredlogs

LOGGER = logging.getLogger("caption_test.make_split")

_RGB_ROOT = Path("/home/servml/Документы/datasets/GTA-UAV-LR")


def main() -> None:
    parser = argparse.ArgumentParser(description="Create 80/20 split for GTA-UAV-LR.")
    parser.add_argument("--ratio", type=float, default=0.8, help="Train ratio (default 0.8).")
    parser.add_argument("--seed", type=int, default=42, help="Random seed.")
    parser.add_argument(
        "--output-dir", type=str, default="meta",
        help="Output directory for split JSONs.",
    )
    args = parser.parse_args()

    coloredlogs.install(
        level="INFO", logger=LOGGER,
        fmt="%(asctime)s %(name)s %(levelname)s %(message)s",
    )

    # Load both original splits.
    train_path = _RGB_ROOT / "cross-area-drone2sate-train.json"
    test_path = _RGB_ROOT / "cross-area-drone2sate-test.json"

    LOGGER.info("📂 Loading %s", train_path.name)
    with open(train_path) as f:
        part1 = json.load(f)
    LOGGER.info("📂 Loading %s", test_path.name)
    with open(test_path) as f:
        part2 = json.load(f)

    all_pairs = part1 + part2
    LOGGER.info("📊 Total pairs: %d", len(all_pairs))

    # Shuffle deterministically.
    rng = random.Random(args.seed)
    rng.shuffle(all_pairs)

    # Split.
    n_train = int(len(all_pairs) * args.ratio)
    train_pairs = all_pairs[:n_train]
    test_pairs = all_pairs[n_train:]

    LOGGER.info(
        "✂️  Split %.0f/%.0f: train=%d (%.1f%%)  test=%d (%.1f%%)",
        args.ratio * 100, (1 - args.ratio) * 100,
        len(train_pairs), 100 * len(train_pairs) / len(all_pairs),
        len(test_pairs), 100 * len(test_pairs) / len(all_pairs),
    )

    # Save.
    out_dir = Path(args.output_dir)
    out_dir.mkdir(parents=True, exist_ok=True)

    train_out = out_dir / "train_80.json"
    test_out = out_dir / "test_20.json"

    with train_out.open("w", encoding="utf-8") as f:
        json.dump(train_pairs, f)
    with test_out.open("w", encoding="utf-8") as f:
        json.dump(test_pairs, f)

    LOGGER.info("💾 Saved: %s (%d pairs)", train_out, len(train_pairs))
    LOGGER.info("💾 Saved: %s (%d pairs)", test_out, len(test_pairs))


if __name__ == "__main__":
    main()