import json
from typing import List

import datasets

from datasets import BuilderConfig
from datasets.features import Features

MAX_DIRECTORY_NAME_LENGTH = 255


_CITATION = """\
@article{kim2020domain,
  title={Beyond Domain APIs: Task-oriented Conversational Modeling with Unstructured Knowledge Access},
  author={Seokhwan Kim and Mihail Eric and Karthik Gopalakrishnan and Behnam Hedayatnia and Yang Liu and Dilek Hakkani-Tur},
  journal={arXiv preprint arXiv:2006.03533}
  year={2020}
}
"""

_HOMEPAGE = "https://github.com/alexa/alexa-with-dstc10-track2-dataset"


_DESCRIPTION = """\

"""

_BASE_URL_DSTC10 = "https://raw.githubusercontent.com/alexa/alexa-with-dstc10-track2-dataset/main/task2"
_BASE_URL_DSTC9 = (
    "https://raw.githubusercontent.com/alexa/alexa-with-dstc9-track1-dataset/master"
)
_URLs = {
    "train": {
        "logs": f"{_BASE_URL_DSTC9}/data/train/logs.json",
        "labels": f"{_BASE_URL_DSTC9}/data/train/labels.json",
        "knowledge": f"{_BASE_URL_DSTC9}/data/knowledge.json",
    },
    "validation": {
        "logs": f"{_BASE_URL_DSTC10}/data/val/logs.json",
        "labels": f"{_BASE_URL_DSTC10}/data/val/labels.json",
        "knowledge": f"{_BASE_URL_DSTC10}/data/knowledge.json",
    },
    "test": {
        "logs": f"{_BASE_URL_DSTC10}/data/test/logs.json",
        "labels": f"{_BASE_URL_DSTC10}/data/test/labels.json",
        "knowledge": f"{_BASE_URL_DSTC10}/data/knowledge.json",
    },
}


class DSTC10Track2Task2(datasets.GeneratorBasedBuilder):

    VERSION = datasets.Version("1.0.0")

    BUILDER_CONFIGS = [
        BuilderConfig(
            name="generation",
            version=VERSION,
            description="",
        ),
    ]

    DEFAULT_CONFIG_NAME = "generation"

    def _info(self):

        features = datasets.Features(
            {
                "id": datasets.Value("string"),
                "gem_id": datasets.Value("string"),
                "turns": [
                    {
                        "speaker": datasets.Value("string"),
                        "text": datasets.Value("string"),
                        "nbest": [
                            {
                                "hyp": datasets.Value("string"),
                                "score": datasets.Value("float"),
                            }
                        ],
                    }
                ],
                "knowledge": {
                    "domain": datasets.Value("string"),
                    "entity_name": datasets.Value("string"),
                    "title": datasets.Value("string"),
                    "body": datasets.Value("string"),
                },
                "response": datasets.Value("string"),
                "source": datasets.Value("string"),
                "linearized_input": datasets.Value("string"),
                "target": datasets.Value("string"),
                "references": [datasets.Value("string")],
            }
        )

        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            supervised_keys=None,
            homepage=_HOMEPAGE,
            citation=_CITATION,
        )

    def _generate_examples(self, logs, knowledge, labels, split=None):
        with open(logs) as fp:
            logs_data = json.load(fp)
        with open(labels) as fp:
            labels_data = json.load(fp)
        with open(knowledge) as fp:
            knowledge_data = json.load(fp)

        i = 0

        for log, label in zip(logs_data, labels_data):
            if not label["target"]:
                continue

            # Ensure that nbest is in all turns
            for turn in log:
                if "nbest" not in turn:
                    turn["nbest"] = []

            if "source" not in label:
                source = "multiwoz"
            else:
                source = label["source"]

            domain, entity_id, doc_id = (
                label["knowledge"][0].get(key)
                for key in ["domain", "entity_id", "doc_id"]
            )
            entity_name = knowledge_data[domain][str(entity_id)]["name"]
            snippet = knowledge_data[domain][str(entity_id)]["docs"][str(doc_id)]

            x = {
                "id": str(i),
                "gem_id": f"GEM-dstc10_track2_task2-{split}-{i}",
                "turns": log,
                "source": source,
                "knowledge": {
                    "domain": domain,
                    "entity_name": entity_name,
                    "title": snippet["title"],
                    "body": snippet["body"],
                },
                "response": label["response"],
                "target": label["response"],
                "references": [label["response"]],
            }

            x["linearized_input"] = self._linearize_example(x)

            i += 1

            yield x["id"], x

    def _download_files(self, urls, data_files, dl_manager):
        if data_files is not None:
            for split, update_dict in data_files.items():
                if isinstance(update_dict, dict):
                    for key, value in update_dict.items():
                        urls[split][key] = value

        return dl_manager.download_and_extract(urls)

    def _linearize_example(self, d):
        repr_string = ""
        for t in d["turns"]:
            repr_string += f"<{t['speaker']}> {t['text']} "
        repr_string += f"|| knowledge domain: {d['knowledge']['domain']}, entity: {d['knowledge']['entity_name']}, title: {d['knowledge']['title']}, information: {d['knowledge']['body']}"
        return repr_string

    def _split_generators(self, dl_manager) -> List[datasets.SplitGenerator]:
        urls_to_download = _URLs
        downloaded_files = self._download_files(
            urls_to_download, self.config.data_files, dl_manager
        )
        for split in ["train", "validation", "test"]:
            downloaded_files[split]["split"] = split

        return [
            datasets.SplitGenerator(name=ds_split, gen_kwargs=downloaded_files[split])
            for ds_split, split in (
                (datasets.Split.TRAIN, "train"),
                (datasets.Split.VALIDATION, "validation"),
                (datasets.Split.TEST, "test"),
            )
        ]