/*
    oslobike - find free bikes in Oslo.
    Copyright (C) 2019  Harald Eilertsen <haraldei@anduin.net>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

/// Error type returned by api calls.
///
/// This type wraps any error that can be returned by the underlying
/// libs used by the oslobike api.
#[derive(Debug)]
pub enum Error {
    InvalidHeaderValue(reqwest::header::InvalidHeaderValue),
    ReqwestError(reqwest::Error),
    JsonError(serde_json::error::Error),
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Error::InvalidHeaderValue(e) => e.fmt(f),
            Error::ReqwestError(e) => e.fmt(f),
            Error::JsonError(e) => e.fmt(f),
        }
    }
}

impl std::error::Error for Error {
    fn cause(&self) -> Option<&std::error::Error> {
        match self {
            Error::InvalidHeaderValue(e) => Some(e),
            Error::ReqwestError(e) => Some(e),
            Error::JsonError(e) => Some(e),
        }
    }
}

impl From<reqwest::header::InvalidHeaderValue> for Error {
    fn from(err: reqwest::header::InvalidHeaderValue) -> Error {
        Error::InvalidHeaderValue(err)
    }
}

impl From<reqwest::Error> for Error {
    fn from(err: reqwest::Error) -> Error {
        Error::ReqwestError(err)
    }
}

impl From<serde_json::error::Error> for Error {
    fn from(err: serde_json::error::Error) -> Error {
        Error::JsonError(err)
    }
}

/// Result type for api calls.
pub type ApiResult<T> = std::result::Result<T, Error>;