/*
    Hurry Curry! - a game about cooking
    Copyright 2024 metamuffin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    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 Affero General Public License for more details.

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

*/
use crate::sprite_renderer::SpriteRenderer;
use hurrycurry_protocol::{glam::IVec2, TileIndex};
use sdl2::rect::{FRect, Rect};
use std::collections::HashMap;

#[derive(Default)]
pub struct Tilemap {
    tile_srcs: Vec<[Rect; 16]>,
    tiles: HashMap<IVec2, (Rect, FRect)>,
}

impl Tilemap {
    pub fn init(&mut self, tile_names: &[String], sprite_rects: &HashMap<String, Rect>) {
        self.tile_srcs = tile_names
            .iter()
            .map(|name| {
                let fallback = sprite_rects
                    .get(&format!("{name}+a"))
                    .copied()
                    .unwrap_or(Rect::new(0, 0, 0, 0));

                [
                    sprite_rects.get(&format!("{name}+")),
                    sprite_rects.get(&format!("{name}+w")),
                    sprite_rects.get(&format!("{name}+e")),
                    sprite_rects.get(&format!("{name}+we")),
                    sprite_rects.get(&format!("{name}+n")),
                    sprite_rects.get(&format!("{name}+wn")),
                    sprite_rects.get(&format!("{name}+en")),
                    sprite_rects.get(&format!("{name}+wen")),
                    sprite_rects.get(&format!("{name}+s")),
                    sprite_rects.get(&format!("{name}+ws")),
                    sprite_rects.get(&format!("{name}+es")),
                    sprite_rects.get(&format!("{name}+wes")),
                    sprite_rects.get(&format!("{name}+ns")),
                    sprite_rects.get(&format!("{name}+wns")),
                    sprite_rects.get(&format!("{name}+ens")),
                    sprite_rects.get(&format!("{name}+wens")),
                ]
                .map(|e| e.copied().unwrap_or(fallback))
            })
            .collect();
    }

    pub fn set(&mut self, pos: IVec2, tile: Option<TileIndex>, neighbors: [Option<TileIndex>; 4]) {
        let Some(tile) = tile else {
            self.tiles.remove(&pos);
            return;
        };

        let mut idx = 0;
        idx |= 0b0100 * (Some(tile) == neighbors[0]) as usize;
        idx |= 0b0001 * (Some(tile) == neighbors[1]) as usize;
        idx |= 0b1000 * (Some(tile) == neighbors[2]) as usize;
        idx |= 0b0010 * (Some(tile) == neighbors[3]) as usize;

        let src = self.tile_srcs[tile.0][idx];
        self.tiles.insert(
            pos,
            (
                src,
                FRect::new(
                    pos.x as f32,
                    pos.y as f32 + 1. - src.height() as f32 / 24.,
                    src.width() as f32 / 32.,
                    src.height() as f32 / 24.,
                ),
            ),
        );
    }

    pub fn draw(&self, ctx: &mut SpriteRenderer) {
        for &(src, dst) in self.tiles.values() {
            ctx.draw(((dst.y + dst.h) * 24.) as i32, src, dst);
        }
    }
}