import json
import os
import datasets

_CITATION = """\
@inproceedings{rastogi2020towards,
  title={Towards scalable multi-domain conversational agents: The schema-guided dialogue dataset},
  author={Rastogi, Abhinav and Zang, Xiaoxue and Sunkara, Srinivas and Gupta, Raghav and Khaitan, Pranav},
  booktitle={Proceedings of the AAAI Conference on Artificial Intelligence},
  volume={34},
  number={05},
  pages={8689--8696},
  year={2020}
}
"""

_DESCRIPTION = """\
The Schema-Guided Dialogue (SGD) dataset contains 18K multi-domain task-oriented
dialogues between a human and a virtual assistant, which covers 17 domains
ranging from banks and events to media, calendar, travel, and weather. The
language presents in the datset is only English. The SGD dataset provides a
challenging testbed for a number of tasks in task-oriented dialogue, including
language understanding, slot filling, dialogue state tracking and response
generation. For the creation of the SGD dataset, they developed a multi-domain
dialogue simulator that generates dialogue outlines over an arbitrary combination
of APIs, dialogue states and system actions. Then, they used a crowd-sourcing
procedure to paraphrase these outlines to natural language utterances. This novel
crowd-sourcing procedure preserves all annotations obtained from the simulator and
does not require any extra annotations after dialogue collection.

"""

_URLs = {
    "data": "https://storage.googleapis.com/huggingface-nlp/datasets/gem/gem_sgd_context.zip",
    "challenge_set": "https://storage.googleapis.com/huggingface-nlp/datasets/gem/gem_challenge_sets/schema_guided_dialog.zip",
}

_SGD_ACTS = [
    "AFFIRM",
    "AFFIRM_INTENT",
    "CONFIRM",
    "GOODBYE",
    "INFORM",
    "INFORM_COUNT",
    "INFORM_INTENT",
    "NEGATE",
    "NEGATE_INTENT",
    "NOTIFY_FAILURE",
    "NOTIFY_SUCCESS",
    "OFFER",
    "OFFER_INTENT",
    "REQUEST",
    "REQUEST_ALTS",
    "REQ_MORE",
    "SELECT",
    "THANK_YOU",
]


class SchemaGuidedDialog(datasets.GeneratorBasedBuilder):
    VERSION = datasets.Version("1.0.0")
    DEFAULT_CONFIG_NAME = "schema_guided_dialog"

    def _info(self):
        features = datasets.Features(
            {
                "gem_id": datasets.Value("string"),
                "gem_parent_id": datasets.Value("string"),
                "dialog_acts": [
                    {
                        "act": datasets.ClassLabel(names=_SGD_ACTS),
                        "slot": datasets.Value("string"),
                        "values": [datasets.Value("string")],
                    }
                ],
                "context": [datasets.Value("string")],
                "dialog_id": datasets.Value("string"),
                "service": datasets.Value("string"),
                "turn_id": datasets.Value("int32"),
                "prompt": datasets.Value("string"),
                "target": datasets.Value("string"),
                "references": [datasets.Value("string")],
            }
        )
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            supervised_keys=None,
            homepage="",
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        """Returns SplitGenerators."""
        dl_dir = dl_manager.download_and_extract(_URLs)
        challenge_sets = [
            (
                "challenge_train_sample",
                "train_schema_guided_dialog_RandomSample500_reformatted.json",
            ),
            (
                "challenge_validation_sample",
                "validation_schema_guided_dialog_RandomSample500_reformatted.json",
            ),
            (
                "challenge_test_backtranslation",
                "test_schema_guided_dialog_BackTranslation500_reformatted.json",
            ),
            (
                "challenge_test_bfp02",
                "test_schema_guided_dialog_ButterFingersPerturbation_p=0.02_500_reformatted.json",
            ),
            (
                "challenge_test_bfp05",
                "test_schema_guided_dialog_ButterFingersPerturbation_p=0.05_500_reformatted.json",
            ),
            (
                "challenge_test_nopunc",
                "test_schema_guided_dialog_WithoutPunctuation500_reformatted.json",
            ),
            (
                "challenge_test_scramble",
                "test_schema_guided_dialog_ScrambleInputStructure500_reformatted.json",
            ),
        ]
        return [
            datasets.SplitGenerator(
                name=spl,
                gen_kwargs={
                    "filepath": os.path.join(dl_dir["data"], "gem_sgd.json"),
                    "split": spl,
                },
            )
            for spl in ["train", "validation", "test"]
        ] + [
            datasets.SplitGenerator(
                name=challenge_split,
                gen_kwargs={
                    "filepath": os.path.join(
                        dl_dir["challenge_set"], "schema_guided_dialog", filename
                    ),
                    "split": challenge_split,
                },
            )
            for challenge_split, filename in challenge_sets
        ]

    def _generate_examples(self, filepath, split, filepaths=None, lang=None):
        """Yields examples."""
        if "challenge" in split:
            exples = json.load(open(filepath, encoding="utf-8"))
            if isinstance(exples, dict):
                assert len(exples) == 1, "multiple entries found"
                exples = list(exples.values())[0]
            for id_, exple in enumerate(exples):
                if len(exple) == 0:
                    continue
                exple["gem_parent_id"] = exple["gem_id"]
                exple["gem_id"] = f"schema_guided_dialog-{split}-{id_}"
                yield id_, exple
        else:
            examples = json.load(open(filepath, encoding="utf-8"))[split]
            for id_, example in enumerate(examples):
                # Fix the one example that has an empty target.
                if not example["target"]:
                    example["target"] = "Thank you, goodbye."
                yield id_, {
                    "gem_id": f"schema_guided_dialog-{split}-{id_}",
                    "gem_parent_id": f"schema_guided_dialog-{split}-{id_}",
                    "dialog_acts": [
                        {
                            "act": act_id,
                            "slot": slot,
                            "values": values,
                        }
                        for act_id, slot, values in example["da"]
                    ],
                    "context": example["context"],
                    "dialog_id": example["dialog_id"],
                    "service": example["service"],
                    "turn_id": example["turn_ix"],
                    "prompt": example["prompt"],
                    "target": example["target"],
                    "references": [] if split == "train" else [example["target"]],
                }