#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copy ref images from benchmark JSONs into benchmarks/assets/ and write portable JSONs.

Usage (on a machine that can read the paths inside the JSON files):
  python scripts/prepare_benchmark_assets.py
  python scripts/prepare_benchmark_assets.py --datasets crosstest AC homa
  python scripts/prepare_benchmark_assets.py --dry-run

Outputs:
  benchmarks/assets/<image_id>/ref_human.png|ref_object.png|ref_pasted.png
  benchmarks/datasets_portable/<same basenames as datasets/>
"""
from __future__ import annotations

import argparse
import hashlib
import json
import os
import re
import shutil
from pathlib import Path

EVAL_ROOT = Path(__file__).resolve().parent.parent
DATASET_DIR = EVAL_ROOT / "benchmarks" / "datasets"
PORTABLE_DIR = EVAL_ROOT / "benchmarks" / "datasets_portable"
ASSETS_DIR = EVAL_ROOT / "benchmarks" / "assets"

DATASET_MAP = {
    "crosstest": "hoi_crosstest_20251107.json",
    "AC": "hoi_AC_test_evalset.json",
    "homa": "hoi_selfcollect_homa1_evalset.json",
}

IMAGE_KEYS = (
    ("ref_image_path", "ref_human.png"),
    ("ref_obj_image_path", "ref_object.png"),
    ("pasted_image", "ref_pasted.png"),
)


def safe_dir_name(image_id: str) -> str:
    s = re.sub(r"[^\w=\-.]", "_", image_id)
    return s[:200] if len(s) > 200 else s


def copy_if_exists(src: str, dst: Path, dry_run: bool) -> bool:
    if not src or not isinstance(src, str):
        return False
    if not src.lower().endswith((".png", ".jpg", ".jpeg", ".webp")):
        return False
    if not os.path.isfile(src):
        return False
    if dry_run:
        return True
    dst.parent.mkdir(parents=True, exist_ok=True)
    if dst.exists() and dst.stat().st_size == os.path.getsize(src):
        return True
    shutil.copy2(src, dst)
    return True


def portable_path(image_id: str, filename: str) -> str:
    return f"benchmarks/assets/{safe_dir_name(image_id)}/{filename}"


def process_dataset(
    src_json: Path,
    dst_json: Path,
    assets_dir: Path,
    dry_run: bool,
    report: dict,
) -> None:
    with open(src_json, "r", encoding="utf-8") as f:
        items = json.load(f)

    out_items = []
    for item in items:
        image_id = item["image_id"]
        subdir = assets_dir / safe_dir_name(image_id)
        new_item = dict(item)

        for json_key, local_name in IMAGE_KEYS:
            src = item.get(json_key)
            if not src:
                continue
            dst_file = subdir / local_name
            if copy_if_exists(src, dst_file, dry_run):
                new_item[json_key] = portable_path(image_id, local_name)
                report["copied"] += 1
            else:
                report["missing"] += 1
                if src.lower().endswith((".png", ".jpg", ".jpeg", ".webp")):
                    report["missing_paths"].append(src)

        out_items.append(new_item)

    if not dry_run:
        dst_json.parent.mkdir(parents=True, exist_ok=True)
        with open(dst_json, "w", encoding="utf-8") as f:
            json.dump(out_items, f, ensure_ascii=False, indent=2)
    report["samples"] = len(out_items)


def main():
    parser = argparse.ArgumentParser(description="Package benchmark ref images for release/HF")
    parser.add_argument(
        "--datasets",
        nargs="+",
        default=list(DATASET_MAP.keys()),
        choices=list(DATASET_MAP.keys()),
        help="Which splits to process",
    )
    parser.add_argument("--dry-run", action="store_true")
    parser.add_argument(
        "--assets-dir",
        type=Path,
        default=ASSETS_DIR,
    )
    parser.add_argument(
        "--portable-dir",
        type=Path,
        default=PORTABLE_DIR,
    )
    args = parser.parse_args()

    total_report = {"copied": 0, "missing": 0, "missing_paths": [], "samples": 0}

    for name in args.datasets:
        src = DATASET_DIR / DATASET_MAP[name]
        dst = args.portable_dir / DATASET_MAP[name]
        report = {"copied": 0, "missing": 0, "missing_paths": [], "samples": 0}
        print(f"[{name}] {src.name}")
        process_dataset(src, dst, args.assets_dir, args.dry_run, report)
        print(
            f"  samples={report['samples']} copied_fields={report['copied']} "
            f"missing_fields={report['missing']}"
        )
        for k in ("copied", "missing", "samples"):
            total_report[k] += report[k]
        total_report["missing_paths"].extend(report["missing_paths"])

    if not args.dry_run and args.assets_dir.exists():
        n_dirs = sum(1 for _ in args.assets_dir.iterdir() if _.is_dir())
        print(f"\nassets: {args.assets_dir} ({n_dirs} sample dirs)")
        print(f"portable json: {args.portable_dir}")

    missing_unique = sorted(set(total_report["missing_paths"]))
    if missing_unique:
        miss_log = EVAL_ROOT / "benchmarks" / "assets_missing.txt"
        if not args.dry_run:
            miss_log.write_text("\n".join(missing_unique) + "\n", encoding="utf-8")
        print(f"\n[warn] {len(missing_unique)} unique missing source files")
        print(f"  log: {miss_log}")
        print("  Re-run this script on the dev machine where those paths exist.")

    if args.dry_run:
        print("\n(dry-run, no files written)")


if __name__ == "__main__":
    main()