# Copyright (c), ETH Zurich and UNC Chapel Hill.
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from .utils import Dataset, SceneInfo


class DatasetETH3D(Dataset):
    @property
    def position_accuracy_gt(self):
        return 0.001

    def list_scenes(self):
        scene_infos = []
        for category_path in (self.data_path / "eth3d").iterdir():
            if not category_path.is_dir() or (
                self.categories and category_path.name not in self.categories
            ):
                continue

            category = category_path.name

            for scene_path in sorted(category_path.iterdir()):
                if not scene_path.is_dir():
                    continue

                scene = scene_path.name
                if self.scenes and scene not in self.scenes:
                    continue

                workspace_path = (
                    self.run_path / self.run_name / "eth3d" / category / scene
                )
                image_path = scene_path / "images"
                sparse_gt_path = list(
                    scene_path.glob("*_calibration_undistorted")
                )[0]

                colmap_extra_args = []
                if category == "dslr":
                    colmap_extra_args.extend(["--data_type", "individual"])
                elif category == "rig":
                    colmap_extra_args.extend(["--data_type", "video"])

                num_images = sum(
                    1
                    for p in image_path.rglob("*")
                    if p.is_file()
                    and p.suffix.lower() in {".jpg", ".jpeg", ".png"}
                )

                scene_info = SceneInfo(
                    dataset="eth3d",
                    category=category,
                    scene=scene,
                    num_images=num_images,
                    workspace_path=workspace_path,
                    image_path=image_path,
                    sparse_gt_path=sparse_gt_path,
                    has_camera_priors=True,
                    colmap_extra_args=colmap_extra_args,
                )

                scene_infos.append(scene_info)

        return scene_infos

    def prepare_scene(self, scene_info):
        # Nothing to prepare for ETH3D.
        pass
