import type { GameState, Era } from '@ai-tycoon/shared';
import { ERA_THRESHOLDS } from '@ai-tycoon/shared';

export function checkEraTransition(state: GameState): Era | null {
  const current = state.meta.currentEra;
  const eraOrder: Era[] = ['startup', 'scaleup', 'bigtech', 'agi'];
  const currentIdx = eraOrder.indexOf(current);
  const nextEra = eraOrder[currentIdx + 1];
  if (!nextEra) return null;

  const thresholds = ERA_THRESHOLDS[nextEra as keyof typeof ERA_THRESHOLDS];
  if (!thresholds) return null;

  const bestModel = state.models.bestDeployedModelScore;

  if (
    state.economy.totalRevenue >= thresholds.revenue &&
    bestModel >= thresholds.capability &&
    state.reputation.score >= thresholds.reputation
  ) {
    return nextEra;
  }

  return null;
}