Add more difficulty

src/main.rs

@@ -13,6 +13,7 @@ use monster_ai_system::*;
 use player::*;
 use visibility_system::*;
 
+use crate::gamelog::GameLog;
 use crate::inventory_system::{ItemCollectionSystem, ItemDropSystem, ItemUseSystem};
 
 mod components;
@@ -25,6 +26,7 @@ mod map_indexing_system;
 mod melee_combat_system;
 mod monster_ai_system;
 mod player;
+mod random_table;
 mod rect;
 mod save_load_system;
 mod spawner;
@@ -46,12 +48,94 @@ pub enum RunState {
         menu_selection: gui::MainMenuSelection,
     },
     SaveGame,
+    NextLevel,
 }
 
 pub struct State {
     pub ecs: World,
 }
 
+impl State {
+    fn entities_to_remove_on_level_change(&mut self) -> Vec<Entity> {
+        let entities = self.ecs.entities();
+        let player = self.ecs.read_storage::<Player>();
+        let backpack = self.ecs.read_storage::<InBackpack>();
+        let player_entity = self.ecs.fetch::<Entity>();
+
+        let mut to_delete: Vec<Entity> = Vec::new();
+        for entity in entities.join() {
+            let mut should_delete = true;
+
+            let p = player.get(entity);
+            if let Some(p) = p {
+                should_delete = false;
+            }
+
+            let bp = backpack.get(entity);
+            if let Some(bp) = bp {
+                if bp.owner == *player_entity {
+                    should_delete = false;
+                }
+            }
+
+            if should_delete {
+                to_delete.push(entity);
+            }
+        }
+
+        to_delete
+    }
+
+    fn goto_next_level(&mut self) {
+        let to_delete = self.entities_to_remove_on_level_change();
+        for target in to_delete {
+            self.ecs
+                .delete_entity(target)
+                .expect("Unable to delete entity")
+        }
+
+        let worldmap;
+        let current_depth;
+        {
+            let mut worldmap_resource = self.ecs.write_resource::<Map>();
+            current_depth = worldmap_resource.depth;
+            *worldmap_resource = Map::new_map_rooms_and_corridors(current_depth + 1);
+            worldmap = worldmap_resource.clone();
+        }
+
+        for room in worldmap.rooms.iter().skip(1) {
+            spawner::spawn_room(&mut self.ecs, room, current_depth + 1);
+        }
+
+        let (player_x, player_y) = worldmap.rooms[0].center();
+        let mut player_position = self.ecs.write_resource::<Point>();
+        *player_position = Point::new(player_x, player_y);
+        let mut position_components = self.ecs.write_storage::<Position>();
+        let player_entity = self.ecs.fetch::<Entity>();
+        let player_pos_comp = position_components.get_mut(*player_entity);
+        if let Some(player_pos) = player_pos_comp {
+            player_pos.x = player_x;
+            player_pos.y = player_y;
+        }
+
+        let mut viewshed_components = self.ecs.write_storage::<Viewshed>();
+        let vs = viewshed_components.get_mut(*player_entity);
+        if let Some(vs) = vs {
+            vs.dirty = true;
+        }
+
+        let mut gamelog = self.ecs.fetch_mut::<GameLog>();
+        gamelog
+            .entries
+            .push("You descend to the next level, and take a moment to heal".to_string());
+        let mut player_health_store = self.ecs.write_storage::<CombatStats>();
+        let player_health = player_health_store.get_mut(*player_entity);
+        if let Some(player_health) = player_health {
+            player_health.hp = i32::max(player_health.hp, player_health.max_hp / 2);
+        }
+    }
+}
+
 impl State {
     fn run_systems(&mut self) {
         let mut vis = VisibilitySystem {};
@@ -221,6 +305,10 @@ impl GameState for State {
                     menu_selection: gui::MainMenuSelection::Quit,
                 };
             }
+            RunState::NextLevel => {
+                self.goto_next_level();
+                new_run_state = RunState::PreRun;
+            }
         }
 
         {
@@ -269,13 +357,13 @@ fn main() -> rltk::BError {
 
     gs.ecs.insert(SimpleMarkerAllocator::<SerializeMe>::new());
 
-    let map = Map::new_map_rooms_and_corridors();
+    let map = Map::new_map_rooms_and_corridors(1);
     let (player_x, player_y) = map.rooms[0].center();
 
     let player_entity = spawner::player(&mut gs.ecs, player_x, player_y);
 
     for room in map.rooms.iter().skip(1) {
-        spawner::spawn_room(&mut gs.ecs, room);
+        spawner::spawn_room(&mut gs.ecs, room, 1);
     }
 
     gs.ecs.insert(map);