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use std::{fmt, error, str};
use {sys, c_str};

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Status {
    status: sys::DDCA_Status,
}

impl Status {
    pub fn new(status: sys::DDCA_Status) -> Self {
        Status {
            status: status,
        }
    }

    pub fn success(&self) -> bool {
        self.status >= 0
    }

    pub fn status(&self) -> sys::DDCA_Status {
        self.status
    }

    pub fn name(&self) -> Option<String> {
        unsafe {
            let res = sys::ddca_rc_name(self.status);
            if res.is_null() {
                None
            } else {
                c_str(res).ok().map(From::from)
            }
        }
    }

    pub fn desc(&self) -> Option<String> {
        unsafe {
            let res = sys::ddca_rc_desc(self.status);
            if res.is_null() {
                None
            } else {
                c_str(res).ok().map(From::from)
            }
        }
    }
}

impl fmt::Debug for Status {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("DDCA_Status")
            .field("status", &self.status)
            .field("name", &self.name())
            .field("desc", &self.desc())
            .finish()
    }
}

impl fmt::Display for Status {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        if let Some(err) = self.desc().or_else(|| self.name()) {
            f.write_str(&err)
        } else {
            f.write_str("unknown DDCA_Status")
        }
    }
}

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Error {
    status: Status,
}

impl Error {
    pub fn new(status: Status) -> Self {
        Error {
            status: status,
        }
    }

    pub fn from_status(status: sys::DDCA_Status) -> Result<Status, Self> {
        let status = Status::new(status);
        if status.success() {
            Ok(status)
        } else {
            Err(Self::new(status))
        }
    }

    pub fn status(&self) -> Status {
        self.status
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.status, f)
    }
}

impl fmt::Debug for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(&self.status, f)
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        "ddcutil error"
    }
}