import * as _ from "lodash";

interface PrioritizedPromise<T> {
  priority: number;
  promise: () => Promise<T>;
}

export const runPriorityPromises = <T>(promises: PrioritizedPromise<T>[], onHigherResolve: (result: T) => void, onResolve?: (result: T) => void) => {
  let leaderPriority = -1;

  for (const { promise, priority } of promises) {
    new Promise(async resolve => {
      try {
        const result: T = await promise();

        if (_.isFunction(onResolve)) {
          onResolve(result);
        }

        if (priority > leaderPriority) {
          leaderPriority = priority;
          onHigherResolve(result);
        }
      } catch {}
    });
  }
}