Implement terrains and rework status logic

src/data/terrain.ts

@@ -0,0 +1,56 @@
+import { Type } from "./type";
+
+export enum TerrainType {
+  NONE,
+  MISTY,
+  ELECTRIC,
+  GRASSY,
+  PSYCHIC
+}
+
+export class Terrain {
+  public terrainType: TerrainType;
+  public turnsLeft: integer;
+
+  constructor(terrainType: TerrainType, turnsLeft?: integer) {
+    this.terrainType = terrainType;
+    this.turnsLeft = turnsLeft || 0;
+  }
+
+  lapse(): boolean {
+    if (this.turnsLeft)
+      return !!--this.turnsLeft;
+
+    return true;
+  }
+
+  getAttackTypeMultiplier(attackType: Type): number {
+    switch (this.terrainType) {
+      case TerrainType.GRASSY:
+        if (attackType === Type.GRASS)
+          return 1.3;
+        break;
+      case TerrainType.PSYCHIC:
+        if (attackType === Type.PSYCHIC)
+          return 1.3;
+        break;
+    }
+
+    return 1;
+  }
+}
+
+export function getTerrainColor(terrainType: TerrainType): [ integer, integer, integer ] {
+  switch (terrainType) {
+    case TerrainType.GRASSY:
+      return [ 120, 200, 80 ];
+    case TerrainType.MISTY:
+      return [ 232, 136, 200 ];
+    case TerrainType.ELECTRIC:
+      return [ 248, 248, 120 ];
+    case TerrainType.PSYCHIC:
+      return [ 160, 64, 160 ];
+  }
+
+  return [ 0, 0, 0 ];
+}