/*
 * Copyright (C) Oscar Shrimpton 2020
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

//! Various types used in parsed BSP files.

use std::convert::TryInto;

/// RGBA Colour (0-255)
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Rgba {
    pub r: u8,
    pub g: u8,
    pub b: u8,
    pub a: u8,
}

impl Rgba {
    /// Interpret the given bytes as an RGBA colour.
    pub fn from_bytes(bytes: [u8; 4]) -> Rgba {
        Rgba {
            r: bytes[0],
            g: bytes[1],
            b: bytes[2],
            a: bytes[3],
        }
    }

    /// Convert a slice to an RGBA colour
    /// # Panics
    /// If slice is not 4 bytes long.
    pub fn from_slice(slice: &[u8]) -> Rgba {
        Rgba::from_bytes(slice.try_into().unwrap())
    }
}

/// RGB Colour (0-255)
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Rgb {
    pub r: u8,
    pub g: u8,
    pub b: u8,
}

impl Rgb {
    /// 255, 255, 255
    pub fn white() -> Rgb {
        Rgb {
            r: 255,
            g: 255,
            b: 255,
        }
    }

    /// Interpret the given bytes as an RGB colour.
    pub fn from_bytes(bytes: [u8; 3]) -> Rgb {
        Rgb {
            r: bytes[0],
            g: bytes[1],
            b: bytes[2],
        }
    }

    /// Convert a slice to an RGB colour
    /// # Panics
    /// If slice is not 3 bytes long.
    pub fn from_slice(slice: &[u8]) -> Rgb {
        Rgb::from_bytes(slice.try_into().unwrap())
    }
}

#[derive(Debug)]
/// An error encountered while parsing.
pub enum ParseError {
    Unsupported,
    Invalid,
}

/// Standard result type.
pub type Result<T> = std::result::Result<T, ParseError>;