feat(inventory): only show equippable items for each player

 - we used to show all equippable items for any class. Now we narrow it down to the items that can be equipped by the current player class that the UI is showing.

src/app/components/party-inventory/party-inventory.component.ts

@@ -17,7 +17,7 @@ import { Component, Input, OnDestroy } from '@angular/core';
 import { Store } from '@ngrx/store';
 import * as Immutable from 'immutable';
 import { BehaviorSubject, Observable, Subject, Subscription } from 'rxjs';
-import { combineLatest, map, switchMap, take, withLatestFrom } from 'rxjs/operators';
+import { combineLatest, switchMap, take, withLatestFrom } from 'rxjs/operators';
 import { AppState } from '../../app.model';
 import { CombatService } from '../../models/combat/combat.service';
 import {
@@ -26,6 +26,7 @@ import {
   EntityWithEquipment,
 } from '../../models/entity/entity.model';
 import { EntityItemTypes } from '../../models/entity/entity.reducer';
+import { EQUIPMENT_SLOTS } from '../../models/game-data/game-data.model';
 import {
   GameStateEquipItemAction,
   GameStateUnequipItemAction,
@@ -56,19 +57,6 @@ export class PartyInventoryComponent implements OnDestroy {
 
   party$: Observable<Immutable.List<Entity>> = this.store.select(getGameParty);
 
-  /** Stream of all inventory excluding items */
-  inventory$: Observable<Immutable.List<EntityItemTypes>> = this.store
-    .select(getGameInventory)
-    .pipe(
-      map((inventory: Immutable.List<EntityItemTypes>) => {
-        return inventory
-          .filter((i: EntityItemTypes) => {
-            return i.type !== 'item';
-          })
-          .toList();
-      })
-    );
-
   /**
    * Emit on this subject to update the current index.
    */
@@ -112,7 +100,31 @@ export class PartyInventoryComponent implements OnDestroy {
       return this.store.select(getEntityEquipment(entity?.eid));
     })
   );
-
+  /** Stream of inventory that the currentEntity$ can equip */
+  inventory$: Observable<Immutable.List<EntityItemTypes>> = this.store
+    .select(getGameInventory)
+    .pipe(
+      combineLatest(
+        this.currentEntity$,
+        (inventory: Immutable.List<EntityItemTypes>, member: EntityWithEquipment) => {
+          return inventory
+            .filter((i: EntityItemTypes) => {
+              // Is an item with a known equipment slot
+              if (EQUIPMENT_SLOTS.indexOf(i.type) !== -1) {
+                // If usedby is empty, anyone can use it
+                if ((i.usedby || []).length === 0) {
+                  return true;
+                }
+                // If the player type is in the usedby array
+                if (i.usedby.includes(member.type)) {
+                  return true;
+                }
+              }
+            })
+            .toList();
+        }
+      )
+    );
   /** Action generator from equip stream */
   private _equipSubscription: Subscription = this.doEquip$
     .pipe(