diff --git a/crates/border-wars/src/actions/mod.rs b/crates/border-wars/src/actions/mod.rs
index 43ac127..02cccda 100644
--- a/crates/border-wars/src/actions/mod.rs
+++ b/crates/border-wars/src/actions/mod.rs
@@ -2,56 +2,72 @@
 
 use crate::map::Tile;
 
+/// A number of action points. This is decreased when you do an action.
+pub struct ActionPoint(pub u32);
+
+/// The action that you can do with a tile.
 pub enum Action {
+    /// Build something on the tile.
     Build(u32),
+
+    /// Destroy something on the tile.
     Destroy(u32),
+
+    /// Recolt something on the tile.
     Recolt(u32),
+
+    /// Upgrade the tile.
     Upgrade(u32),
+
+    /// Manage the villages.
     VillageManagement,
+
+    /// Manage the troops.
     TroopManagement,
 }
 
 impl Tile {
-    pub fn get_action(&self, index_of_tile: u8) -> Vec<Action> {
-        match *self {
-            Self::Breeding => [
-                Action::Destroy(index_of_tile),
-                Action::Upgrade(index_of_tile),
-            ],
-            Self::Casern => [
-                Action::Destroy(index_of_tile),
-                Action::Upgrade(index_of_tile),
-                Action::TroopManagement,
-            ],
-            Self::Castle => [
-                Action::Upgrade(index_of_tile),
-                Action::VillageManagement,
-            ],
-            Self::Hill => [
-                Action::Recolt(index_of_tile),
-            ],
-            Self::Grass => [
-                Action::Build(index_of_tile),
-            ],
-            Self::Forest => [
-                Action::Recolt(index_of_tile),
-            ],
-            Self::Mine => [
-                Action::Destroy(index_of_tile),
-                Action::Upgrade(index_of_tile),
-            ],
-            Self::Outpost => [
-                Action::Destroy(index_of_tile),
-            ],
-            Self::Sawmill => [
-                Action::Destroy(index_of_tile),
-                Action::Recolt(index_of_tile),
-            ],
-            Self::Tower => [
-                Action::Destroy(index_of_tile),
-                Action::Upgrade(index_of_tile),
-            ],
-            Self::Wall => [],
+    /// Get the actions that you can do with the tile.
+    pub fn get_action(&self, index_of_tile: u32) -> Vec<Action> {
+        let mut actions = vec![];
+
+        if let Self::Breeding
+        | Self::Casern
+        | Self::Castle
+        | Self::Mine
+        | Self::Outpost
+        | Self::Sawmill
+        | Self::Tower = *self
+        {
+            actions.push(Action::Upgrade(index_of_tile));
         }
+
+        if let Self::Breeding | Self::Casern | Self::Mine | Self::Outpost | Self::Sawmill = *self {
+            actions.push(Action::Destroy(index_of_tile));
+        }
+
+        if let Self::Breeding | Self::Casern = *self {
+            actions.push(Action::TroopManagement);
+        }
+
+        if let Self::Breeding | Self::Hill = *self {
+            actions.push(Action::Recolt(index_of_tile));
+        }
+
+        actions
+    }
+}
+
+impl Action {
+    /// Get the cost of an action.
+    pub fn point_cost(&self) -> ActionPoint {
+        ActionPoint(match *self {
+            Action::Build(_) => 50,
+            Action::Destroy(_) => 10,
+            Action::Recolt(_) => 10,
+            Action::Upgrade(_) => 25,
+            Action::VillageManagement => 0,
+            Action::TroopManagement => 0,
+        })
     }
 }