import os
import json
from datasets import (
    GeneratorBasedBuilder,
    DatasetInfo,
    Features,
    Value,
    Sequence,
    Split,
    SplitGenerator,
    BuilderConfig,
)

# -------------------------
# Features specification
# -------------------------
SUITE_DATASET_CONDITION_SPEC = {
    "condition_name": Value("string"),
    "content": Value("string"),
    "regions": Sequence({
        "region_number": Value("int32"),
        "content": Value("string"),
    }),
}

SUITE_DATASET_SPEC = Features({
    "suite_name": Value("string"),
    "item_number": Value("int32"),
    "conditions": Sequence(SUITE_DATASET_CONDITION_SPEC),
    "predictions": Sequence(Value("string")),
})

# -------------------------
# Dataset builder
# -------------------------
class SyntacticAgreement(GeneratorBasedBuilder):
    BUILDER_CONFIG_CLASS = BuilderConfig
    BUILDER_CONFIGS = [
        BuilderConfig(
            name="spanish",
            description="Spanish syntax test suites",
        ),
        BuilderConfig(
            name="italian",
            description="Italian syntax test suites",
        ),
        BuilderConfig(
            name="portuguese",
            description="Portuguese syntax test suites",
        ),
        BuilderConfig(
            name="russian",
            description="Russian syntax test suites",
        ),
    ]

    def _info(self):
        return DatasetInfo(
            description="Agreement syntax test suites in multiple languages.",
            features=SUITE_DATASET_SPEC,
            supervised_keys=None,
            homepage="",
            license="",
            citation="https://aclanthology.org/2025.depling-1.4/",
        )

    def _split_generators(self, dl_manager):
        # URL to the zip archive of the selected language
        base_url = "https://huggingface.co/datasets/albalbalba/SyntacticAgreement/resolve/main"
        archive_url = f"{base_url}/{self.config.name}.zip"
        extracted_dir = dl_manager.download_and_extract(archive_url)

        # Handle case where extraction produces a nested folder (italian/italian/*.json)
        possible_nested = os.path.join(extracted_dir, self.config.name)
        if os.path.exists(possible_nested):
            data_dir = possible_nested
        else:
            data_dir = extracted_dir

        return [
            SplitGenerator(
                name=Split.TRAIN,
                gen_kwargs={"data_dir": data_dir},
            ),
        ]

    def _generate_examples(self, data_dir):
        for filename in sorted(os.listdir(data_dir)):
            if not filename.endswith(".json"):
                continue
            filepath = os.path.join(data_dir, filename)
            with open(filepath, encoding="utf-8") as f:
                data = json.load(f)

            suite_name = data["meta"]["name"]
            predictions = [p["formula"] for p in data.get("predictions", [])]

            for item in data.get("items", []):
                item_number = item["item_number"]
                conditions = []
                for condition in item.get("conditions", []):
                    content_all = " ".join(
                        [region["content"] for region in condition["regions"]]
                    ).lstrip(" ")
                    content_all = (
                        content_all.replace("  ", " ")
                        .replace(" .", ".")
                        .replace(" ,", ",")
                        .replace("¿ ", "¿")
                    )
                    conditions.append({
                        "condition_name": condition["condition_name"],
                        "content": content_all,
                        "regions": [
                            {
                                "region_number": region["region_number"],
                                "content": region["content"],
                            }
                            for region in condition["regions"]
                        ],
                    })

                key = f"{suite_name}_{item_number}"
                yield key, {
                    "suite_name": suite_name,
                    "item_number": item_number,
                    "conditions": conditions,
                    "predictions": predictions,
                }