I don't know what I'm doing and it rocks

src/battle.rs

@@ -0,0 +1,115 @@
+use crate::unit::Unit;
+use crate::statistics::StatBlock;
+
+pub enum Field {
+    City,
+    Forest,
+    Plains,
+    Building,
+    Volcano,
+    BrokenLands,
+    Void,
+    Chaos,
+    NOWHERE,
+}
+
+pub enum Weather {
+    Sun,
+    Rain,
+    Sleet,
+    Hail,
+    Meteor,
+    BrokenSky,
+    Void,
+    NONE,
+}
+
+pub struct BattleUnit {
+    unit: Unit,
+    bufs: StatBlock,
+    debufs: StatBlock,
+}
+impl BattleUnit {
+    pub fn new(unit: Unit) -> Self {
+        Self {
+            unit,
+            bufs: StatBlock::new_zero(),
+            debufs: StatBlock::new_zero(),
+        }
+    }
+}
+
+pub struct BattleTeam {
+    front: [Option<BattleUnit>; 3],
+    back: [Option<BattleUnit>; 3],
+}
+impl BattleTeam {
+    pub fn new(front: [Option<BattleUnit>; 3], back: [Option<BattleUnit>; 3]) -> Self {
+        Self {
+            front,
+            back,
+        }
+    }
+}
+
+pub struct Battle {
+    view_team: BattleTeam,
+    oppose_team: BattleTeam,
+    field: Field,
+    weather: Weather,
+}
+impl Battle {
+    pub fn new(view_team: BattleTeam, oppose_team: BattleTeam, field: Field, weather: Weather) -> Self {
+        Self {
+            view_team,
+            oppose_team,
+            field,
+            weather,
+        }
+    }
+    pub fn bufs(&self) -> StatBlock {
+        let mut sb = StatBlock::new_zero();
+        match self.weather {
+            Weather::BrokenSky => sb.add_magick(3),
+            _ => (),
+        };
+        match self.field {
+            Field::BrokenLands => sb.add_strength(3),
+            Field::Chaos => {
+                sb.add_intellect(5);
+                sb.add_magick(5);
+            },
+            _ => ()
+        };
+        sb
+    }
+    pub fn debufs(&self) -> StatBlock {
+        let mut sb = StatBlock::new_zero();
+        match self.weather {
+            Weather::Rain => sb.add_agility(-2),
+            Weather::Sleet => sb.add_agility(-5),
+            Weather::Hail => sb.add_defense(-2),
+            Weather::Meteor => {
+                sb.add_strength(-5);
+                sb.add_defense(-5);
+                sb.add_intellect(-5);
+            },
+            Weather::Sun => sb.add_magick(-1),
+            _ => (),
+        };
+        match self.field {
+            Field::Forest => sb.add_dexterity(-2),
+            Field::Building => sb.add_agility(-2),
+            Field::BrokenLands => sb.add_vitality(-5),
+            Field::Chaos => {
+                sb.add_defense(-10);
+                sb.add_vitality(-10);
+                sb.add_strength(-10);
+                sb.add_dexterity(-10);
+            },
+            _ => (),
+        };
+        sb
+    }
+    //TODO: how to handle moves, move order, etc
+}

src/lib.rs

@@ -4,3 +4,4 @@ pub mod statistics;
 pub mod unit;
 pub mod inventory;
 pub mod status;
+pub mod battle;

src/status.rs

@@ -8,4 +8,6 @@ pub enum Status {
     Confuse,    // chance to hit random target (self included)
     Stop,       // miss turn
     Haste,      // speed is doubled
+    Faint,      // close to death
+    Dead,       // dead, cannot be revived
 }