import json
import os
import datasets


class WindtunnelDataset(datasets.GeneratorBasedBuilder):
    """Dataset for loading simulation data with JSON and mesh files"""

    def _info(self):
        return datasets.DatasetInfo(
            features=datasets.Features(
                {
                    "coeff": datasets.Value("binary"),  # JSON file as a dictionary
                    "input": datasets.Value("binary"),  # JSON file as a dictionary
                    "input_mesh": datasets.Value("binary"),  # OBJ mesh file as binary
                    "openfoam_mesh": datasets.Value(
                        "binary"
                    ),  # OBJ mesh file as binary
                    "pressure_field_mesh": datasets.Value(
                        "binary"
                    ),  # VTK file as binary
                    "streamlines_mesh": datasets.Value("binary"),  # PLY file as binary
                }
            ),
            homepage="https://inductiva.ai",
        )

    def _split_generators(self, dl_manager):
        """Define the splits for the dataset."""
        train_dir = "train"
        val_dir = "validation"
        test_dir = "test"
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN, gen_kwargs={"path": train_dir}
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={"path": val_dir},
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={"path": test_dir},
            ),
        ]

    def _generate_examples(self, path):
        """Generate examples for each split."""
        id = 0
        for root, dirs, files in os.walk(path):
            for file in files:
                yield (
                    id,
                    {
                        "label": id,
                    },
                )
                id += 1