use std::fmt;


pub type EntityId = (EntityType, u32);


#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub enum EntityType {
    Creature,
    Site,
    Item,
}


#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct Location {
    pub x: i32,
    pub y: i32,
}

#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct Entity {
    pub id: EntityId,
}

impl Entity {
    pub fn new_creature() -> Entity {
        Entity { id: (EntityType::Creature, 0) }
    }

    pub fn new_site() -> Entity {
        Entity { id: (EntityType::Site, 0) }
    }

    pub fn new_item() -> Entity {
        Entity { id: (EntityType::Item, 0) }
    }    
}


impl fmt::Display for Location {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.x, self.y)
    }
}