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import json
from pathlib import Path
import tempfile
import unittest

from vwg_bench.external import prepare_ruler, prepare_vreason


class ExternalAdapterTest(unittest.TestCase):
    def test_ruler_keeps_seeds_separate(self):
        metadata = [
            {
                "id": 0,
                "image_path": "RULER-Bench/images/maze/17.png",
                "task_name": "maze",
            }
        ]
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            metadata_path = root / "metadata.json"
            metadata_path.write_text(json.dumps(metadata), encoding="utf-8")
            videos = root / "videos"
            videos.mkdir()
            (videos / "0_seed0.mp4").write_bytes(b"seed0")
            (videos / "0_seed1.mp4").write_bytes(b"seed1")
            output = root / "prepared"
            report = prepare_ruler(
                metadata_path,
                videos,
                output,
                [0, 1],
                "{id}_seed{seed}.mp4",
            )
            self.assertEqual(report["copied"], 2)
            self.assertEqual(
                (output / "seed_0" / "maze" / "17.mp4").read_bytes(),
                b"seed0",
            )
            self.assertEqual(
                (output / "seed_1" / "maze" / "17.mp4").read_bytes(),
                b"seed1",
            )

    def test_vreason_name_conversion(self):
        metadata = [
            {
                "id": 0,
                "image_path": "V-ReasonBench/block_slide_05.png",
                "task_name": "block_slide",
            }
        ]
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            metadata_path = root / "metadata.json"
            metadata_path.write_text(json.dumps(metadata), encoding="utf-8")
            videos = root / "videos"
            videos.mkdir()
            (videos / "0_seed0.mp4").write_bytes(b"video")
            output = root / "prepared"
            report = prepare_vreason(
                metadata_path,
                videos,
                output,
                [0],
                "wan2-2",
                "{id}_seed{seed}.mp4",
            )
            self.assertEqual(report["copied"], 1)
            self.assertTrue(
                (output / "block_slide_wan2-2_05_0.mp4").is_file()
            )


if __name__ == "__main__":
    unittest.main()