/*
 * 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/>.
 */

use std::fmt;

use crate::types::RGB;

/// Stores light map textures that help make surface lighting more realistic
#[derive(Clone)]
pub struct LightMap {
    pub map: [[RGB; 128]; 128],
}

impl PartialEq for LightMap {
    fn eq(&self, other: &LightMap) -> bool {
        for x in 0..128 {
            for y in 0..128 {
                if self.map[x][y] != other.map[x][y] {
                    return false;
                }
            }
        }
        true
    }
}

impl fmt::Debug for LightMap {
    // rust can't derive debug for 3d arrays so done manually
    // \_( )_/
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "LightMap {{ map: [")?;
        for c in self.map.iter() {
            write!(f, "[")?;
            for x in c.iter() {
                write!(f, "{:?}, ", x)?;
            }
            write!(f, "], ")?;
        }
        write!(f, "}}")
    }
}

pub trait HasLightMaps {
    type LightMapsIter<'a>: Iterator<Item = &'a LightMap>;

    fn lightmaps_iter(&self) -> Self::LightMapsIter<'_>;
    fn get_lightmap(&self, index: u32) -> &LightMap;
}