import { MutableSignal, mutableSignal, createRNG } from 'boardgame-core';
import { createRunState, generatePointCrawlMap, data, type RunState, type ItemData } from 'boardgame-core/samples/slay-the-spire-like';

/**
 * 全局游戏运行状态 Signal
 * 
 * 在 App.tsx 中创建为单例，所有场景共享。
 * 遭遇场景通过读取此 signal 的当前遭遇状态来构建 UI。
 */
export function createGameState(seed?: number): MutableSignal<RunState> {
  const actualSeed = seed ?? Date.now();
  const rng = createRNG(actualSeed);
  const encounters = data.desert.encounters;
  const map = generatePointCrawlMap(rng, encounters);
  const starterItems: ItemData[] = data.desert.items.slice(0, 3);
  return mutableSignal<RunState>(createRunState(map, starterItems));
}

/** 获取当前遭遇数据（computed getter） */
export function currentEncounter(
  gameState: MutableSignal<RunState>
): { nodeId: string; encounter: { name: string; description: string; type: string } } | null {
  const state = gameState.value;
  const node = state.map.nodes.get(state.currentNodeId);
  if (!node || !node.encounter) return null;
  return {
    nodeId: node.id,
    encounter: {
      type: node.type,
      name: node.encounter.name,
      description: node.encounter.description,
    },
  };
}