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/*
Copyright 2016 Martin Buck
This file is part of rust-3d.
rust-3d is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
rust-3d 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with rust-3d.  If not, see <http://www.gnu.org/licenses/>.
*/

use std::result;
use std::fmt;
use std::num::ParseFloatError;
use std::io::Error as ioError;

pub enum ErrorKind {
    MinMaxSwapped,
    MinMaxEqual,
    TooFewPoints,
    BoundingBoxMissing,
    NormalizeVecWithoutLength,
    IOError,
    ParseError,
    IncorrectFaceID,
    IncorrectVertexID,
    IncorrectVoxelID,
    IncorrectDimension,
    DimensionsDontMatch,
    NumberConversionError,
    NumberInWrongRange
}

impl ErrorKind {
    fn as_str(&self) -> &'static str {
        match *self {
            ErrorKind::MinMaxSwapped             => "Passed min/max values are swapped (min > max)",
            ErrorKind::MinMaxEqual               => "Passed min/max values are equal",
            ErrorKind::TooFewPoints              => "Container had too few points for the operation",
            ErrorKind::BoundingBoxMissing        => "Bounding box is missing for the operation",
            ErrorKind::NormalizeVecWithoutLength => "Can't normalize a vector of length 0",
            ErrorKind::IOError                   => "Can't read or write a file",
            ErrorKind::ParseError                => "Can't parse data",
            ErrorKind::IncorrectFaceID           => "Used an incorrect face id",
            ErrorKind::IncorrectVertexID         => "Used an incorrect vertex id",
            ErrorKind::IncorrectVoxelID          => "Used an incorrect voxel id",
            ErrorKind::IncorrectDimension        => "Trying to access an incorrect dimension",
            ErrorKind::DimensionsDontMatch       => "Trying to mix types with different dimensions",
            ErrorKind::NumberConversionError     => "Failed converting one number type to another",
            ErrorKind::NumberInWrongRange        => "Passed number is within the wrong range"
        }
    }
}

impl fmt::Debug for ErrorKind {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.as_str())
    }
}

pub type Result<T> = result::Result<T, ErrorKind>;

pub trait ToErrorKind {
    fn to_error_kind(&self) -> ErrorKind;
}

impl ToErrorKind for ParseFloatError {
    fn to_error_kind(&self) -> ErrorKind {
        ErrorKind::ParseError //@todo use new float conversion error instead?
    }
}

impl ToErrorKind for ioError {
    fn to_error_kind(&self) -> ErrorKind {
        ErrorKind::IOError //@todo improve reporting
    }
}