skillcask 0.8.0

use std::fmt;

pub const MANIFEST: u8 = 1;
pub const AUTH: u8 = 2;
pub const NETWORK: u8 = 3;
pub const HASH: u8 = 4;
pub const IO: u8 = 5;

#[derive(Debug)]
pub struct Error {
    pub code: u8,
    pub msg: String,
    /// The next step, printed on its own line under the error.
    pub hint: Option<String>,
}

pub type Result<T> = std::result::Result<T, Error>;

impl Error {
    pub fn new(code: u8, msg: impl Into<String>) -> Self {
        Error { code, msg: msg.into(), hint: None }
    }

    pub fn hint(mut self, hint: impl Into<String>) -> Self {
        self.hint = Some(hint.into());
        self
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&self.msg)
    }
}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Self {
        Error::new(IO, e.to_string())
    }
}

impl From<zip::result::ZipError> for Error {
    fn from(e: zip::result::ZipError) -> Self {
        Error::new(IO, format!("archive: {e}"))
    }
}

/// `bail!(CODE, "fmt", args…)` returns an `Error` with that exit code.
#[macro_export]
macro_rules! bail {
    ($code:expr, $($arg:tt)*) => {
        return Err($crate::error::Error::new($code, format!($($arg)*)))
    };
}

pub trait Context<T> {
    fn ctx(self, what: impl fmt::Display) -> Result<T>;
}

impl<T, E: Into<Error>> Context<T> for std::result::Result<T, E> {
    fn ctx(self, what: impl fmt::Display) -> Result<T> {
        self.map_err(|e| {
            let e = e.into();
            Error { msg: format!("{what}: {}", e.msg), ..e }
        })
    }
}