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use std::io;

use thiserror::Error;

#[derive(Debug, Error)]
#[non_exhaustive]
pub enum IOError {
    #[error("error reading treebank")]
    IO(#[from] io::Error),

    #[error(transparent)]
    Parse(#[from] ParseError),
}

/// CoNLL-U parsing errors.
#[derive(Debug, Error, Eq, PartialEq)]
#[non_exhaustive]
pub enum ParseError {
    /// The form is missing in the CoNLL-U data.
    #[error("form field is missing")]
    MissingFormField,

    /// The feature field could not be parsed
    #[error("cannot parse feature field: {value:?}")]
    IncorrectFeatureField { value: String },

    /// An integer field could not be parsed as an integer.
    #[error("cannot parse as integer field: {value:?}")]
    ParseIntField { value: String },

    /// The identifier field could not be parsed.
    #[error("cannot parse as identifier field: {value:?})")]
    ParseIdentifierField { value: String },
}

/// Graph errors.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum GraphError {
    /// The graph is missing relevant information.
    #[error("incomplete graph: {value:?}")]
    IncompleteGraph { value: String },
}