# MIT License
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# Copyright (c) 2020- CNRS
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from functools import partial

import torchaudio
from pyannote.database import FileFinder, Protocol, get_annotated
from pyannote.database.protocol import SpeakerVerificationProtocol

from pyannote.audio.core.io import Audio, get_torchaudio_info

get_duration = Audio(mono="downmix").get_duration


def check_protocol(protocol: Protocol) -> Protocol:
    """Check that protocol is suitable for training a model

        - does it provide a training set?
        - does it provide a validation set?
        - does it provide a way to access audio content?
        - does it provide a way to delimit annotated content?

    Returns
    -------
    fixed_protocol : Protocol
    checks: dict
        has_validation : bool
        has_scope : bool
        has_classes : bool

    Raises
    ------
    ValueError if protocol does not pass the check list and cannot be fixed.

    """

    # does protocol define a training set?
    try:
        file = next(protocol.train())
    except (AttributeError, NotImplementedError):
        msg = f"Protocol {protocol.name} does not define a training set."
        raise ValueError(msg)

    # does protocol provide audio keys?
    if "audio" not in file:

        if "waveform" in file:
            if "sample_rate" not in file:
                msg = f'Protocol {protocol.name} provides audio with "waveform" key but is missing a "sample_rate" key.'
                raise ValueError(msg)

        else:

            file_finder = FileFinder()
            try:
                _ = file_finder(file)

            except (KeyError, FileNotFoundError):
                msg = (
                    f"Protocol {protocol.name} does not provide the path to audio files. "
                    f"See pyannote.database documentation on how to add an 'audio' preprocessor."
                )
                raise ValueError(msg)
            else:
                protocol.preprocessors["audio"] = file_finder
                msg = (
                    f"Protocol {protocol.name} does not provide the path to audio files: "
                    f"adding an 'audio' preprocessor for you. See pyannote.database documentation "
                    f"on how to do that yourself."
                )
                print(msg)

    if "waveform" not in file and "torchaudio.info" not in file:

        # use soundfile when available (it usually is faster than ffmpeg for getting info)
        backends = (
            torchaudio.list_audio_backends()
        )  # e.g ['ffmpeg', 'soundfile', 'sox']
        backend = "soundfile" if "soundfile" in backends else backends[0]
        protocol.preprocessors["torchaudio.info"] = partial(
            get_torchaudio_info, backend=backend
        )
        msg = (
            f"Protocol {protocol.name} does not precompute the output of torchaudio.info(): "
            f"adding a 'torchaudio.info' preprocessor for you to speed up dataloaders. "
            f"See pyannote.database documentation on how to do that yourself."
        )
        print(msg)

    if "annotated" not in file:

        if "duration" not in file:
            protocol.preprocessors["duration"] = get_duration

        protocol.preprocessors["annotated"] = get_annotated

        msg = (
            f"Protocol {protocol.name} does not provide the 'annotated' regions: "
            f"adding an 'annotated' preprocessor for you. See pyannote.database documentation "
            f"on how to do that yourself."
        )
        print(msg)

    has_scope = "scope" in file
    has_classes = "classes" in file

    # does protocol define a validation set?
    if isinstance(protocol, SpeakerVerificationProtocol):
        validation_method = "development_trial"
    else:
        validation_method = "development"

    try:
        _ = next(getattr(protocol, validation_method)())
    except (AttributeError, NotImplementedError):
        has_validation = False
    else:
        has_validation = True

    checks = {
        "has_validation": has_validation,
        "has_scope": has_scope,
        "has_classes": has_classes,
    }

    return protocol, checks