/*
 Cargo KConfig - KConfig parser
 Copyright (C) 2022  Sjoerd van Leent

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Unless required by applicable law or agreed to in writing, software distributed
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specific language governing permissions and limitations under the License.

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Copyright Notice: GPLv2

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it under the terms of the GNU General Public License as published by
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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/>.

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this software and associated documentation files (the “Software”), to deal in
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/

//! This file implements errors returned from the kconfig representation

use std::{fmt::Display, io};

/// An Error is returned when the representation of the AST into a higher-level
/// presentation failed.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Error {
    msg: String,
}

impl Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "{}", self.msg,)
    }
}

impl From<String> for Error {
    fn from(s: String) -> Self {
        Error::new(&s)
    }
}

impl From<io::Error> for Error {
    fn from(e: io::Error) -> Self {
        Self {
            msg: format!("{}", e),
        }
    }
}

impl From<&str> for Error {
    fn from(s: &str) -> Self {
        Error::new(s)
    }
}

impl From<kconfig_parser::Error> for Error {
    fn from(e: kconfig_parser::Error) -> Self {
        Error::new(&format!("{}", e))
    }
}

impl From<Vec<(String, String)>> for Error {
    fn from(invalid_lines: Vec<(String, String)>) -> Self {
        let mut err_msg = String::new();
        for (msg, line) in invalid_lines {
            err_msg.push_str(&format!("{}: {}\n", msg, line));
        }
        Error::new(&err_msg)
    }
}

impl Error {
    pub(crate) fn new(msg: &str) -> Self {
        Self {
            msg: msg.to_string(),
        }
    }
}

/// A LoadError is returned when during loading of a .config file, errors where found.
/// Typically, this is non-destructive, but an end-user should be warned through the
/// frontend that something went wrong during loading of the .config file.
pub enum LoadError {
    IoError(io::Error),
    Error(Error),
}

impl From<io::Error> for LoadError {
    fn from(e: io::Error) -> Self {
        LoadError::IoError(e)
    }
}

impl From<Error> for LoadError {
    fn from(e: Error) -> Self {
        LoadError::Error(e)
    }
}

impl Display for LoadError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            LoadError::IoError(e) => write!(f, "{}", e),
            LoadError::Error(e) => write!(f, "{}", e),
        }
    }
}

#[cfg(test)]
mod tests {
    use std::io;

    use crate::{Error, LoadError};

    #[test]
    fn ctor() -> Result<(), Error> {
        let e = Error {
            msg: "FOO".to_owned(),
        };

        assert_eq!("FOO".to_owned(), format!("{e}"));

        Ok(())
    }

    #[test]
    fn new() -> Result<(), Error> {
        let e = Error::new("FOO");
        assert_eq!("FOO".to_owned(), format!("{e}"));
        Ok(())
    }

    #[test]
    fn from_string() -> Result<(), Error> {
        let e = Error::from("FOO".to_owned());
        assert_eq!("FOO".to_owned(), format!("{e}"));
        Ok(())
    }

    #[test]
    fn from_str() -> Result<(), Error> {
        let e = Error::from("FOO");
        assert_eq!("FOO".to_owned(), format!("{e}"));
        Ok(())
    }

    #[test]
    fn from_io_error() -> Result<(), Error> {
        let ioe = io::Error::new(io::ErrorKind::Unsupported, "FOO");
        let e = Error::from(ioe);
        assert_eq!("FOO".to_owned(), format!("{e}"));
        Ok(())
    }

    #[test]
    fn from_lines() -> Result<(), Error> {
        let invalid_lines = vec![
            ("FOO".to_owned(), "1".to_owned()),
            ("BAR".to_owned(), "2".to_owned()),
        ];
        let e = Error::from(invalid_lines);
        assert_eq!("FOO: 1\nBAR: 2\n", format!("{e}"));
        Ok(())
    }

    #[test]
    fn load_error_from_io_error() -> Result<(), Error> {
        let ioe = io::Error::new(io::ErrorKind::Unsupported, "FOO");
        let le = LoadError::from(ioe);
        assert_eq!("FOO", format!("{le}"));
        Ok(())
    }

    #[test]
    fn load_error_from_error() -> Result<(), Error> {
        let e = Error::from("FOO");
        let le = LoadError::from(e);
        assert_eq!("FOO", format!("{le}"));
        Ok(())
    }
}