from typing import Dict, Iterable, List

import evaluate
from datasets import Features, Value

from .artifact import __file__ as _
from .blocks import __file__ as _
from .card import __file__ as _
from .catalog import __file__ as _
from .collections import __file__ as _
from .dataclass import __file__ as _
from .dict_utils import __file__ as _
from .file_utils import __file__ as _
from .formats import __file__ as _
from .fusion import __file__ as _
from .generator_utils import __file__ as _
from .hf_utils import __file__ as _
from .instructions import __file__ as _
from .load import __file__ as _
from .loaders import __file__ as _
from .logging_utils import __file__ as _
from .metrics import __file__ as _
from .normalizers import __file__ as _
from .operator import (MultiStreamOperator, SequentialOperator,
                       SequentialOperatorInitilizer, StreamInitializerOperator)
from .operator import __file__ as _
from .operators import (Apply, ApplyMetric, ApplyOperatorsField,
                        FlattenInstances, MergeStreams, SplitByValue)
from .operators import __file__ as _
from .processors import __file__ as _
from .random_utils import __file__ as _
from .recipe import __file__ as _
from .register import __file__ as _
from .register import _reset_env_local_catalogs, register_all_artifacts
from .schema import UNITXT_DATASET_SCHEMA
from .schema import __file__ as _
from .split_utils import __file__ as _
from .splitters import __file__ as _
from .standard import __file__ as _
from .stream import MultiStream, Stream
from .stream import __file__ as _
from .task import __file__ as _
from .templates import __file__ as _
from .text_utils import __file__ as _
from .type_utils import __file__ as _
from .utils import __file__ as _
from .validate import __file__ as _
from .version import __file__ as _


class MultiStreamScoreMean(MultiStreamOperator):
    def aggegate_results(self, multi_stream: MultiStream):
        scores = []
        for stream in multi_stream.values():
            instance = stream.peek()
            scores.append(instance["score"]["global"]["score"])

        from statistics import mean

        return mean(scores)

    def spread_results(self, stream: Stream, score: float):
        for instance in stream:
            instance["score"]["global"]["groups_mean_score"] = score
            yield instance

    def spread_results_one_stream(self, stream: Stream):
        for instance in stream:
            instance["score"]["global"]["groups_mean_score"] = instance["score"][
                "global"
            ]["score"]
            yield instance

    def process(self, multi_stream: MultiStream) -> MultiStream:
        result = {}

        # optimization in to avoid double calculation of metrics
        # when aggregating results, if there is only one stream.
        if len(multi_stream) == 1:
            for stream_name, stream in multi_stream.items():
                result[stream_name] = Stream(
                    self.spread_results_one_stream, gen_kwargs={"stream": stream}
                )
            return MultiStream(result)

        mean_score = self.aggegate_results(multi_stream)
        result = {}
        for stream_name, stream in multi_stream.items():
            result[stream_name] = Stream(
                self.spread_results, gen_kwargs={"stream": stream, "score": mean_score}
            )

        return MultiStream(result)


class FromPredictionsAndOriginalData(StreamInitializerOperator):
    def zip(self, predictions, references):
        for prediction, original in zip(predictions, references):
            yield {**original, "prediction": prediction}

    def process(
        self, predictions: List[str], references: Iterable, split_name: str = "all"
    ) -> MultiStream:
        return MultiStream(
            {
                split_name: Stream(
                    self.zip,
                    gen_kwargs={"predictions": predictions, "references": references},
                )
            }
        )


# The additional_inputs field in the schema is defined as
# Sequence({"key": Value(dtype="string"), "value": Value("string")})
# When receiving instances from this scheme, the keys and values are returned as two separate
# lists, and are converted to a dictionary.


def _from_key_value_pairs(key_value_list: Dict[str, list]) -> Dict[str, str]:
    return dict(zip(key_value_list["key"], key_value_list["value"]))


class MetricRecipe(SequentialOperatorInitilizer):
    calc_confidence_intervals: bool = True

    def prepare(self):
        register_all_artifacts()
        self.steps = [
            FromPredictionsAndOriginalData(),
            Apply(
                "additional_inputs",
                function=_from_key_value_pairs,
                to_field="additional_inputs",
            ),
            ApplyOperatorsField(
                operators_field="postprocessors",
            ),
            SplitByValue(["group"]),
            ApplyMetric(
                "metrics",
                calc_confidence_intervals=self.calc_confidence_intervals,
            ),
            MultiStreamScoreMean(),
            MergeStreams(),
        ]


UNITXT_METRIC_SCHEMA = Features(
    {"predictions": Value("string"), "references": dict(UNITXT_DATASET_SCHEMA)}
)


def _compute(
    predictions: List[str],
    references: Iterable,
    flatten: bool = False,
    split_name: str = "all",
    calc_confidence_intervals: bool = True,
):
    _reset_env_local_catalogs()
    register_all_artifacts()
    recipe = MetricRecipe(calc_confidence_intervals=calc_confidence_intervals)

    multi_stream = recipe(
        predictions=predictions, references=references, split_name=split_name
    )

    if flatten:
        operator = FlattenInstances()
        multi_stream = operator(multi_stream)

    stream = multi_stream[split_name]
    return list(stream)


# TODO: currently we have two classes with this name. metric.Metric and matrics.Metric...
# @evaluate.utils.file_utils.add_start_docstrings(_DESCRIPTION, _KWARGS_DESCRIPTION)
class Metric(evaluate.Metric):
    calc_confidence_intervals: bool = True

    def _info(self):
        return evaluate.MetricInfo(
            description="_DESCRIPTION",
            citation="_CITATION",
            # inputs_description=_KWARGS_DESCRIPTION,
            features=UNITXT_METRIC_SCHEMA,
            codebase_urls=["https://"],
            reference_urls=[
                "https://",
                "https://",
            ],
        )

    def _compute(
        self,
        predictions: List[str],
        references: Iterable,
        flatten: bool = False,
        split_name: str = "all",
    ):
        try:
            from unitxt.dataset import \
                get_dataset_artifact as get_dataset_artifact_installed

            unitxt_installed = True
        except ImportError:
            unitxt_installed = False

        if unitxt_installed:
            from unitxt.metric import _compute as _compute_installed

            return _compute_installed(
                predictions=predictions,
                references=references,
                flatten=flatten,
                split_name=split_name,
                calc_confidence_intervals=self.calc_confidence_intervals,
            )

        return _compute(
            predictions=predictions,
            references=references,
            flatten=flatten,
            split_name=split_name,
            calc_confidence_intervals=self.calc_confidence_intervals,
        )