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use crate::entities::{Character, Entity};
use crate::tiling::{Tile, TileGrid, TileType};
use crate::world::{apply_movement, Dungeon, Generatable, Level, Movement};
const PLAYER_SIGHT: usize = 3;
pub struct State {
pub player: Character,
dungeon: Dungeon,
level: usize,
grid: Option<TileGrid>,
}
impl State {
pub fn new(player: Character, dungeon: Dungeon) -> State {
State {
player,
dungeon,
level: 0,
grid: None,
}
}
pub fn init(&mut self) {
self.dungeon.generate();
self.switch_level(0);
self.player.place(self.current_level().start_point());
}
pub fn switch_level(&mut self, num_level: usize) {
self.level = num_level;
self.grid = Some(self.current_level().to_tilegrid().unwrap());
}
pub fn current_level(&self) -> &Level {
&self.dungeon.levels[self.level]
}
fn can_step_on(tile: &Tile) -> bool {
match tile.get_type() {
TileType::Floor => true,
TileType::StairsDown => true,
TileType::StairsUp => true,
_ => false,
}
}
pub fn move_player(&mut self, dir: Movement) -> Result<(), String> {
let grid = match &self.grid {
Some(g) => g,
None => return Err(String::from("No level loaded!")),
};
let loc = apply_movement(*self.player.location(), dir)?;
// Is the new location colliding with anything?
if !State::can_step_on(grid.block_at(loc.0, loc.1)) {
return Err(String::from("Can't move entity!"));
}
self.player.move_by(dir)
}
pub fn down_stairs(&mut self) -> Result<(), String> {
let grid = match &self.grid {
Some(g) => g,
None => return Err(String::from("No level loaded!")),
};
if self.level == self.dungeon.depth() - 1 {
return Err(String::from("Already at the bottom level"));
}
let loc = self.player.location();
match grid.block_at(loc.0, loc.1).get_type() {
TileType::StairsDown => {
self.switch_level(self.level + 1);
Ok(())
}
_ => Err(String::from("Not on stairs!")),
}
}
pub fn up_stairs(&mut self) -> Result<(), String> {
let grid = match &self.grid {
Some(g) => g,
None => return Err(String::from("No level loaded!")),
};
if self.level == 0 {
return Err(String::from("Already at the top level"));
}
let loc = self.player.location();
match grid.block_at(loc.0, loc.1).get_type() {
TileType::StairsUp => {
self.switch_level(self.level - 1);
Ok(())
}
_ => Err(String::from("Not on stairs!")),
}
}
}
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