init

engine/core/StateManager.ts

@@ -0,0 +1,94 @@
+import type { Condition, Effect, ChoiceRecord } from '../types'
+
+export class StateManager {
+  variables: Record<string, number> = {}
+  flags: Set<string> = new Set()
+  history: ChoiceRecord[] = []
+
+  init(initialVars: Record<string, number>) {
+    this.variables = { ...initialVars }
+    this.flags = new Set()
+    this.history = []
+  }
+
+  getVar(name: string): number {
+    return this.variables[name] ?? 0
+  }
+
+  setVar(name: string, value: number) {
+    this.variables[name] = value
+  }
+
+  addVar(name: string, delta: number) {
+    this.variables[name] = (this.variables[name] ?? 0) + delta
+  }
+
+  hasFlag(name: string): boolean {
+    return this.flags.has(name)
+  }
+
+  setFlag(name: string) {
+    this.flags.add(name)
+  }
+
+  clearFlag(name: string) {
+    this.flags.delete(name)
+  }
+
+  evaluate(conditions: Condition[]): boolean {
+    return conditions.every((c) => {
+      switch (c.op) {
+        case '==':
+          return this.variables[c.variable] === c.value
+        case '!=':
+          return this.variables[c.variable] !== c.value
+        case '>':
+          return (this.variables[c.variable] ?? 0) > (c.value as number)
+        case '<':
+          return (this.variables[c.variable] ?? 0) < (c.value as number)
+        case '>=':
+          return (this.variables[c.variable] ?? 0) >= (c.value as number)
+        case '<=':
+          return (this.variables[c.variable] ?? 0) <= (c.value as number)
+        case 'hasFlag':
+          return this.flags.has(c.variable)
+        default:
+          return false
+      }
+    })
+  }
+
+  apply(effects: Effect[]) {
+    for (const e of effects) {
+      switch (e.type) {
+        case 'set':
+          this.variables[e.target] = e.value as number
+          break
+        case 'add':
+          this.addVar(e.target, e.value as number)
+          break
+        case 'toggleFlag':
+          this.setFlag(e.target)
+          break
+      }
+    }
+  }
+
+  recordChoice(choice: ChoiceRecord) {
+    this.history.push(choice)
+  }
+
+  toJSON() {
+    return {
+      variables: { ...this.variables },
+      flags: [...this.flags],
+      history: [...this.history],
+    }
+  }
+
+  fromJSON(data: { variables: Record<string, number>; flags: string[]; history: ChoiceRecord[] }) {
+    this.variables = { ...data.variables }
+    this.flags = new Set(data.flags)
+    this.history = [...data.history]
+  }
+}