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// x11-rs: Rust bindings for X11 libraries
// The X11 libraries are available under the MIT license.
// These bindings are public domain.

use std::error::Error;
use std::fmt::{
  Display,
  Formatter,
};


//
// OpenError
//


#[derive(Clone, Debug)]
pub struct OpenError {
  kind: OpenErrorKind,
  detail: String,
}

impl OpenError {
  pub fn detail (&self) -> &str {
    self.detail.as_ref()
  }

  pub fn kind (&self) -> OpenErrorKind {
    self.kind
  }

  pub fn new (kind: OpenErrorKind, detail: String) -> OpenError {
    OpenError {
      kind: kind,
      detail: detail,
    }
  }
}

impl Display for OpenError {
  fn fmt (&self, f: &mut Formatter) -> Result<(), ::std::fmt::Error> {
    try!(f.write_str(self.kind.as_str()));
    if !self.detail.is_empty() {
      try!(f.write_str(" ("));
      try!(f.write_str(self.detail.as_ref()));
      try!(f.write_str(")"));
    }
    return Ok(());
  }
}

impl Error for OpenError {
  fn description (&self) -> &str {
    self.kind.as_str()
  }
}


//
// OpenErrorKind
//


#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum OpenErrorKind {
  Library,
  Symbol,
}

impl OpenErrorKind {
  pub fn as_str (self) -> &'static str {
    match self {
      OpenErrorKind::Library => "opening library failed",
      OpenErrorKind::Symbol => "loading symbol failed",
    }
  }
}