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//! Custom error types

use std::fmt;

use std::io;
use std::path;

/// Type alias for result<T, [`Error`]>
pub type Result<T> = std::result::Result<T, WrappedError>;

/// Custom I/O Error which adds context information to the original
#[derive(Debug, Default)]
pub struct WrappedError {
    pub(crate) inner: Repr,
}

/// Inner representation of the custom error
#[derive(Debug)]
pub(crate) enum Repr {
    IO {
        base: io::Error,
        file: path::PathBuf,
    },
    Simple(Kind),
}

/// Error options
#[derive(Debug)]
pub enum Kind {
    /// Used when no variants apply
    Unknown,
}

impl Default for Repr {
    fn default() -> Self {
        Repr::Simple(Kind::Unknown)
    }
}

impl WrappedError {
    ///Consume the error, returning the internal error if any
    pub fn into_inner(self) -> Option<Box<dyn std::error::Error>> {
        match self.inner {
            Repr::IO { base, .. } => Some(Box::new(base)),
            Repr::Simple(_) => None,
        }
    }

    /// Get the inner io::error if any
    pub fn get_io_error(&self) -> Option<&io::Error> {
        match &self.inner {
            Repr::IO { base, .. } => Some(base),
            _ => None,
        }
    }

    /// Create a new error from the original error and the path that provoced the error
    pub fn from(kind: Kind) -> Self {
        Self {
            inner: Repr::Simple(kind),
        }
    }

    /// Create IO error
    pub fn io_error(base: io::Error, file: impl AsRef<path::Path>) -> Self {
        Self {
            inner: Repr::IO {
                file: file.as_ref().to_owned(),
                base,
            },
        }
    }
}

impl fmt::Display for Kind {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self {
            Kind::Unknown => write!(f, "Unknown error"),
        }
    }
}

impl fmt::Display for WrappedError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.inner {
            #[cfg(feature = "fs")]
            Repr::IO { base, file } => {
                write!(f, "{}, file: {:?}", base.to_string(), file.as_os_str())
            }
            Repr::Simple(kind) => write!(f, "{}", kind.to_string()),
        }
    }
}

impl std::error::Error for WrappedError {}