"""
Module which defines custom exception and enumerations used when
instiating and re-raising those exceptions.
"""

from __future__ import annotations

from typing import TYPE_CHECKING, Literal

from enum import Enum
try:
    from enum import StrEnum
except ImportError:
    class StrEnum(str, Enum):
        def __str__(self) -> str:
            return str(self.value)


if TYPE_CHECKING:
    from rvc_logic.typing_extra import StrPath, TrainingSampleRate


class Entity(StrEnum):
    """Enumeration of entities that can be provided."""

    # General entities
    FILE = "file"
    FILES = "files"
    DIRECTORY = "directory"
    DIRECTORIES = "directories"

    # Model entities
    MODEL_NAME = "model name"
    MODEL_NAMES = "model names"
    UPLOAD_NAME = "upload name"
    MODEL = "model"
    VOICE_MODEL = "voice model"
    TRAINING_MODEL = "training model"
    CUSTOM_EMBEDDER_MODEL = "custom embedder model"
    CUSTOM_PRETRAINED_MODEL = "custom pretrained model"
    GENERATOR = "generator"
    DISCRIMINATOR = "discriminator"
    MODEL_FILE = "model file"
    MODEL_BIN_FILE = "pytorch_model.bin file"
    CONFIG_JSON_FILE = "config.json file"

    # Audio entities
    AUDIO_TRACK = "audio track"
    AUDIO_TRACK_GAIN_PAIRS = "pairs of audio track and gain"
    VOICE_TRACK = "voice track"
    SPEECH_TRACK = "speech track"
    VOCALS_TRACK = "vocals track"
    SONG_DIR = "song directory"
    DATASET = "dataset"
    DATASETS = "datasets"
    DATASET_NAME = "dataset name"
    DATASET_FILE_LIST = "dataset file list"
    PREPROCESSED_AUDIO_DATASET_FILES = "preprocessed dataset audio files"

    # Source entities
    SOURCE = "source"
    URL = "URL"

    # GPU entities
    GPU_IDS = "GPU IDs"

    # Config entities
    CONFIG = "configuration"
    CONFIG_NAME = "configuration name"
    CONFIG_NAMES = "configuration names"
    EVENT = "event"
    COMPONENT = "component"


AudioFileEntity = Literal[
    Entity.AUDIO_TRACK,
    Entity.VOICE_TRACK,
    Entity.SPEECH_TRACK,
    Entity.VOCALS_TRACK,
    Entity.FILE,
]

AudioDirectoryEntity = Literal[Entity.SONG_DIR, Entity.DATASET, Entity.DIRECTORY]

ModelEntity = Literal[
    Entity.MODEL,
    Entity.VOICE_MODEL,
    Entity.TRAINING_MODEL,
    Entity.CUSTOM_EMBEDDER_MODEL,
    Entity.CUSTOM_PRETRAINED_MODEL,
]

ConfigEntity = Literal[Entity.EVENT, Entity.COMPONENT]


class Location(StrEnum):
    """Enumeration of locations where entities can be found."""

    # Audio locations
    AUDIO_ROOT = "the root of the audio base directory"
    INTERMEDIATE_AUDIO_ROOT = "the root of the intermediate audio base directory"
    SPEECH_AUDIO_ROOT = "the root of the speech audio directory"
    TRAINING_AUDIO_ROOT = "the root of the training audio directory"
    OUTPUT_AUDIO_ROOT = "the root of the output audio directory"

    # Model locations
    EXTRACTED_ZIP_FILE = "extracted zip file"


class Step(StrEnum):
    """Enumeration of steps that can be run."""

    DATASET_PREPROCESSING = "dataset preprocessing"
    FEATURE_EXTRACTION = "feature extraction"


class UIMessage(StrEnum):
    """
    Enumeration of messages that can be displayed in the UI
    in place of core exception messages.
    """

    # General messages
    NO_UPLOADED_FILES = "No files selected."

    # Audio messages
    NO_AUDIO_TRACK = "No audio tracks provided."
    NO_SPEECH_AUDIO_FILES = (
        "No files selected. Please select one or more speech audio files to delete."
    )
    NO_OUTPUT_AUDIO_FILES = (
        "No files selected. Please select one or more output audio files to delete."
    )
    NO_SONG_DIR = "No song directory selected."
    NO_SONG_DIRS = (
        "No song directories selected. Please select one or more song directories"
        " containing intermediate audio files to delete."
    )
    NO_DATASETS = (
        "No datasets selected. Please select one or more datasets containing audio"
        " files to delete."
    )

    # Model messages
    NO_MODEL = "No model selected."
    NO_MODELS = "No models selected."
    NO_VOICE_MODEL = "No voice model selected."
    NO_VOICE_MODELS = "No voice models selected."
    NO_TRAINING_MODELS = "No training models selected."
    NO_CUSTOM_EMBEDDER_MODEL = "No custom embedder model selected."
    NO_CUSTOM_EMBEDDER_MODELS = "No custom embedder models selected."
    NO_CUSTOM_PRETRAINED_MODELS = "No custom pretrained models selected."
    NO_CUSTOM_PRETRAINED_MODEL = "No custom pretrained model selected."

    # Source messages
    NO_AUDIO_SOURCE = (
        "No source provided. Please provide a valid Youtube URL, local audio file"
        " or song directory."
    )
    NO_TEXT_SOURCE = (

"No source provided. Please provide a valid text string or path to a text file."
    )

    # GPU messages
    NO_GPUS = "No GPUs selected."

    # Config messages
    NO_CONFIG = "No configuration selected."
    NO_CONFIGS = "No configurations selected."


class NotProvidedError(ValueError):
    """Raised when an entity is not provided."""

    def __init__(self, entity: Entity, ui_msg: UIMessage | None = None) -> None:
        """
        Initialize a NotProvidedError instance.

        Exception message will be formatted as:

        "No `<entity>` provided."

        Parameters
        ----------
        entity : Entity
            The entity that was not provided.
        ui_msg : UIMessage, default=None
            Message which, if provided, is displayed in the UI
            instead of the default exception message.

        """
        super().__init__(f"No {entity} provided.")
        self.ui_msg = ui_msg


class NotFoundError(OSError):
    """Raised when an entity is not found in a given location."""

    def __init__(
        self,
        entity: Entity,
        location: StrPath | Location,
        is_path: bool = True,
    ) -> None:
        """
        Initialize a NotFoundError instance.

        Exception message will be formatted as:

        "`<entity>` not found `(`in `|` at:`)` `<location>`."

        Parameters
        ----------
        entity : Entity
            The entity that was not found.
        location : StrPath | Location
            The location where the entity was not found.
        is_path : bool, default=True
            Whether the location is a path to the entity.

        """
        proposition = "at:" if is_path else "in"
        entity_cap = entity.capitalize() if not entity.isupper() else entity
        super().__init__(
            f"{entity_cap} not found {proposition} {location}",
        )


class EntityNotFoundError(OSError):
    """Raised when an entity is not found."""

    def __init__(self, entity: Entity, name: str) -> None:
        r"""
        Initialize an EntityNotFoundError instance.

        Exception message will be formatted as:

        "`<entity>` with name '`<name>`' not found."

        Parameters
        ----------
        entity : Entity
            The entity that was not found.
        name : str
            The name of the entity that was not found.

        """
        super().__init__(f"{entity.capitalize()} with name '{name}' not found.")


class ModelNotFoundError(EntityNotFoundError):
    """Raised when an model with a given name is not found."""

    def __init__(self, entity: ModelEntity, name: str) -> None:
        r"""
        Initialize a ModelNotFoundError instance.

        Exception message will be formatted as:

        '`<entity>` with name "`<name>`" not found.'

        Parameters
        ----------
        entity : ModelEntity
            The model entity that was not found.
        name : str
            The name of the model that was not found.

        """
        super().__init__(entity, name)


class ConfigNotFoundError(EntityNotFoundError):
    """Raised when a configuration with a given name is not found."""

    def __init__(self, name: str) -> None:
        r"""
        Initialize a ConfigNotFoundError instance.

        Exception message will be formatted as:

        'Configuration with name '`<name>`' not found.'

        Parameters
        ----------
        name : str
            The name of the configuration that was not found.

        """
        super().__init__(Entity.CONFIG, name)


class PretrainedModelNotAvailableError(OSError):
    """Raised when a pretrained model is not available."""

    def __init__(
        self,
        name: str,
        sample_rate: TrainingSampleRate | None = None,
        download: bool = True,
    ) -> None:
        r"""
        Initialize a PretrainedModelNotAvailableError instance.

        Exception message will be formatted as:

        'Pretrained model with name "`<name>`"
        [and sample rate `<sample_rate>`] is not available [for
        download].'

        Parameters
        ----------
        name : str
            The name of the pretrained model that is not available for
            download.
        sample_rate : TrainingSampleRate, optional
            The sample rate of the pretrained model that is not
            available.
        download : bool, default=True
            Whether the pretrained model is not available for download

or not available on disk.

        """
        suffix = f" and sample rate {sample_rate}" if sample_rate else ""
        second_suffix = " for download" if download else ""
        super().__init__(
            f"Pretrained model with name '{name}'{suffix} is not"
            f" available{second_suffix}.",
        )


class PretrainedModelIncompatibleError(OSError):
    """
    Raised when a pretrained model is incompatible with a given sample
    rate.
    """

    def __init__(self, name: str, sample_rate: TrainingSampleRate) -> None:
        r"""
        Initialize an IncompatiblePretrainedModelError instance.

        Exception message will be formatted as:

        'Pretrained model with name "`<name>`" is incompatible with
        sample rate `<sample_rate>`.'

        Parameters
        ----------
        name : str
            The name of the pretrained model that is incompatible with
            a given sample rate.
        sample_rate : TrainingSampleRate
            The sample rate that the pretrained model is incompatible
            with.

        """
        super().__init__(
            f"Pretrained model with name '{name}' is incompatible with sample rate"
            f" {sample_rate}.",
        )


class GPUNotFoundError(OSError):
    """Raised when a GPU with a given id is not found."""

    def __init__(self, device_id: int | None = None) -> None:
        r"""
        Initialize a GPUNotFoundError instance.

        Exception message will be formatted as:

        'GPU with id `<id>` not found.'

        Parameters
        ----------
        device_id : int, optional
            The id of a GPU that is not found.

        """
        super().__init__(
            f"No GPU with id {device_id} found.",
        )


class ModelAsssociatedEntityNotFoundError(OSError):
    """Raised when an entity associated with a model is not found."""

    def __init__(
        self,
        entity: Entity,
        model_name: str,
        required_step: Step | None = None,
    ) -> None:
        r"""
        Initialize a ModelAsssociatedEntityNotFoundError instance.

        Exception message will be formatted as:

        'No `<entity>` associated with the model with name
        "`<model_name>`". [Please run `<required_step>` first.]'

        Parameters
        ----------
        entity : Entity
            The entity that is not associated with the model.
        model_name : str
            The name of the model that the entity is not associated
            with.
        required_step : Step | None, default=None
            The required step that needs to be run before will be
            associated with the model.

        """
        suffix = f"Please run {required_step} first." if required_step else ""
        super().__init__(
            f"No {entity.capitalize()} associated with the model with name"
            f" {model_name}. {suffix}",
        )


class EntityExistsError(OSError):
    """Raised when an entity already exists."""

    def __init__(self, entity: Entity, name: str) -> None:
        r"""
        Initialize an EntityExistsError instance.

        Exception message will be formatted as:

        '`<entity>` with name '`<name>`' already exists. Please provide
        a different name for your {entity}.'

        Parameters
        ----------
        entity : Entity
            The entity that already exists.
        name : str
            The name of the entity that already exists.

        """
        super().__init__(
            f"{entity.capitalize()} with name '{name}' already exists. Please provide a"
            f" different name for your {entity}.",
        )


class ModelExistsError(EntityExistsError):
    """Raised when a model already exists."""

    def __init__(self, entity: ModelEntity, name: str) -> None:
        r"""
        Initialize a ModelExistsError instance.

        Exception message will be formatted as:

        '`<entity>` with name "`<name>`" already exists. Please provide
        a different name for your {entity}.'

        Parameters
        ----------
        entity : ModelEntity
            The model entity that already exists.
        name : str
            The name of the model that already exists.

        """
        super().__init__(entity, name)


class ConfigExistsError(EntityExistsError):
    """Raised when a configuration already exists."""

    def __init__(self, name: str) -> None:
        r"""

Initialize a ConfigExistsError instance.

        Exception message will be formatted as:

        'Configuration with name '`<name>`' already exists. Please
        provide a different name for your {entity}.'

        Parameters
        ----------
        name : str
            The name of the configuration that already exists.

        """
        super().__init__(Entity.CONFIG, name)


class PretrainedModelExistsError(OSError):
    """
    Raised when a pretrained model with a given name and sample rate
    already exists.
    """

    def __init__(self, name: str, sample_rate: TrainingSampleRate) -> None:
        r"""
        Initialize a PretrainedModelExistsError instance.

        Exception message will be formatted as:

        'Pretrained model with name "`<name>`" and sample rate
        `<sample_rate>` already exists.'

        Parameters
        ----------
        name : str
            The name of the pretrained model that already exists.
        sample_rate : TrainingSampleRate
            The sample rate of the pretrained model that already exists.

        """
        super().__init__(
            f"Pretrained model with name '{name}' and sample rate {sample_rate} already"
            " exists.",
        )


class InvalidLocationError(OSError):
    """Raised when an entity is in a wrong location."""

    def __init__(self, entity: Entity, location: Location, path: StrPath) -> None:
        r"""
        Initialize an InvalidLocationError instance.

        Exception message will be formatted as:

        "`<entity>` should be located in `<location>` but found at:
        `<path>`"

        Parameters
        ----------
        entity : Entity
            The entity that is in a wrong location.
        location : Location
            The correct location for the entity.
        path : StrPath
            The path to the entity.

        """
        entity_cap = entity.capitalize() if not entity.isupper() else entity
        super().__init__(
            f"{entity_cap} should be located in {location} but found at: {path}",
        )


class HttpUrlError(OSError):
    """Raised when a HTTP-based URL is invalid."""

    def __init__(self, url: str) -> None:
        """
        Initialize a HttpUrlError instance.

        Exception message will be formatted as:

        "Invalid HTTP-based URL: `<url>`"

        Parameters
        ----------
        url : str
            The invalid HTTP-based URL.

        """
        super().__init__(
            f"Invalid HTTP-based URL: {url}",
        )


class YoutubeUrlError(OSError):
    """
    Raised when an URL does not point to a YouTube video or
    , potentially, a Youtube playlist.
    """

    def __init__(self, url: str, playlist: bool) -> None:
        """
        Initialize a YoutubeURlError instance.

        Exception message will be formatted as:

        "URL does not point to a YouTube video `[`or playlist`]`:
         `<url>`"

        Parameters
        ----------
        url : str
            The URL that does not point to a YouTube video or playlist.
        playlist : bool
            Whether the URL might point to a YouTube playlist.

        """
        suffix = " or playlist" if playlist else ""
        super().__init__(
            f"Not able to access Youtube video{suffix} at: {url}",
        )


class UploadLimitError(ValueError):
    """Raised when the upload limit for an entity is exceeded."""

    def __init__(self, entity: Entity, limit: str | float) -> None:
        """
        Initialize an UploadLimitError instance.

        Exception message will be formatted as:

        "At most `<limit>` `<entity>` can be uploaded."

        Parameters
        ----------
        entity : Entity
            The entity for which the upload limit was exceeded.
        limit : str
            The upload limit.

        """
        super().__init__(f"At most {limit} {entity} can be uploaded.")


class UploadTypeError(ValueError):
    """
    Raised when one or more uploaded entities have an invalid
    type.
    """

    def __init__(
        self,
        entity: Entity,
        valid_types: list[str],
        type_class: Literal["formats", "names"],
        multiple: bool,
    ) -> None:
        """
        Initialize an UploadTypeError instance.

        Exception message will be formatted as:

        "Only `<entity>` with the following `<type_class>` can be
        uploaded `(`by themselves | together`)`: `<types>`."

        Parameters
        ----------
        entity : Entity
            The entity with an invalid type that was uploaded.
        valid_types : list[str]
            The valid types for the entity that was uploaded.
        type_class : Literal["formats", "names"]
            The name for the class of valid types.
        multiple : bool
            Whether multiple instances of the entity were uploaded.

        """
        suffix = "by themselves" if not multiple else "together (at most one of each)"
        super().__init__(
            f"Only {entity} with the following {type_class} can be uploaded {suffix}:"
            f" {', '.join(valid_types)}.",
        )


class InvalidAudioFormatError(ValueError):
    """Raised when an audio file has an invalid format."""

    def __init__(self, path: StrPath, formats: list[str]) -> None:
        """
        Initialize an InvalidAudioFormatError instance.

        Exception message will be formatted as:

        "Invalid audio file format: `<path>`. Supported formats are:
        `<formats>`."

        Parameters
        ----------
        path : StrPath
            The path to the audio file with an invalid format.
        formats : list[str]
            Supported audio formats.

        """
        super().__init__(
            f"Invalid audio file format: {path}. Supported formats are:"
            f" {', '.join(formats)}.",
        )


class NotInstantiatedError(ValueError):
    """Raised when an entity is not instantiated."""

    def __init__(self, entity: Entity) -> None:
        """
        Initialize a NotInstantiatedError instance.

        Exception message will be formatted as:

        "`<entity>` has not been instantiated."

        """
        super().__init__(f"{entity} has not been instantiated.")


class ComponentNotInstatiatedError(NotInstantiatedError):
    """Raised when a component is not instantiated."""

    def __init__(self) -> None:
        """
        Initialize a ComponentNotInstantiatedError instance.

        Exception message will be formatted as:

        "Component has not been instantiated."

        """
        super().__init__(Entity.COMPONENT)


class EventNotInstantiatedError(NotInstantiatedError):
    """Raised when an event is not instantiated."""

    def __init__(self) -> None:
        """
        Initialize a EventNotInstantiatedError instance.

        Exception message will be formatted as:

        "Event has not been instantiated."

        """
        super().__init__(Entity.EVENT)