1 files changed, 106 insertions, 0 deletions
diff --git a/dungeon/src/enemy.rs b/dungeon/src/enemy.rs
new file mode 100644
index 0000000..8c818f5
--- /dev/null
+++ b/dungeon/src/enemy.rs
@@ -0,0 +1,106 @@
+use crate::{Direction, Entity, FPos, Pos};
+
+pub const ZOMBIE_HEALTH: u32 = 50;
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum EnemyMoveSpeed {
+	Slow,
+	Medium,
+	Fast,
+}
+
+/// Every (value) seconds, an enemy with a (speed) can move one tile
+pub const SLOW_SPEED_SEC_PER_TILE: f32 = 1.;
+pub const MEDIUM_SPEED_SEC_PER_TILE: f32 = 0.5;
+pub const FAST_SPEED_SEC_PER_TILE: f32 = 0.25;
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum EnemyAttackType {
+	Melee,
+	Ranged,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum EnemyType {
+	Zombie,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Enemy {
+	pub entity: Entity,
+	pub enemy_type: EnemyType,
+	pub move_speed: EnemyMoveSpeed,
+	pub attack_type: EnemyAttackType,
+	time_acc: f32,
+}
+
+impl Enemy {
+	pub fn new(enemy_type: EnemyType, pos: Pos) -> Self {
+		match enemy_type {
+			EnemyType::Zombie => Self::zombie(pos),
+		}
+	}
+
+	fn _new(
+		pos: Pos,
+		health: u32,
+		enemy_type: EnemyType,
+		move_speed: EnemyMoveSpeed,
+		attack_type: EnemyAttackType,
+	) -> Self {
+		let entity = Entity::enemy(pos, health);
+		Self {
+			entity,
+			enemy_type,
+			move_speed,
+			attack_type,
+			time_acc: 0.,
+		}
+	}
+
+	fn zombie(pos: Pos) -> Self {
+		Self::_new(
+			pos,
+			ZOMBIE_HEALTH,
+			EnemyType::Zombie,
+			EnemyMoveSpeed::Slow,
+			EnemyAttackType::Melee,
+		)
+	}
+
+	fn is_there(&self) -> bool {
+		self.time_acc
+			>= match &self.move_speed {
+				EnemyMoveSpeed::Slow => SLOW_SPEED_SEC_PER_TILE,
+				EnemyMoveSpeed::Medium => MEDIUM_SPEED_SEC_PER_TILE,
+				EnemyMoveSpeed::Fast => FAST_SPEED_SEC_PER_TILE,
+			}
+	}
+
+	///
+	/// Rough concept for enemy "AI":
+	///
+	/// State: Roam/Patrol
+	///     Moves around in a small area (2x2, 3x3, 4x4) randomly choosing direction and how much to move.
+	/// State: Attack
+	///     Sees player in facing direction (only in box/rectangle in dir)
+	///     (ex. facing north, if player is anywhere above monster and theres no walls in the way, attack)
+	///     Do A* pathing to player until enemy dead or player dead or floor change
+	///
+	/// Current implementation below is just a test
+	///
+	pub fn update(&mut self, player_pos: Pos, time_since_last_frame: f32) {
+		if self.entity.pos == player_pos {
+			return;
+		}
+
+		self.time_acc += time_since_last_frame;
+		if self.is_there() {
+			let temp_pos = self.entity.pos.step(Direction::West).unwrap();
+			self.entity.pos = temp_pos;
+			self.entity.fpos = FPos::from_pos(temp_pos);
+
+			self.time_acc = 0.;
+		}
+	}
+}