import { ValidSelectorFunction } from "../types/nope";

/**
 * Helper, which will allways select the first item.
 * @param options must contain the serviceName and rpcManager.
 * @returns
 */
export const firstItemSelector: ValidSelectorFunction = ({
  serviceName,
  rpcManager,
}) => {
  return rpcManager.services.originalData.get(serviceName)[0];
};

// export function _generateSelectorFunction(selector: ValidDefaultSelectors) {
//     const _this = this;
//     let helperData: any;

//     switch (selector) {
//       default:
//       case "first":
//         return async (dispatcher: string) => {
//           return true;
//         };
//       case "dispatcher":
//         // Our selector compares the dispatcher - id
//         return async (externalDispatcher, options) => {
//           return externalDispatcher == _this.id;
//         };
//       case "host":
//         // Our selector compares the host-name:
//         // 1. Get the current Host name of our dispatcher
//         helperData = this._genAliveMessage().host.name;
//         return async (externalDispatcher) => {
//           const host = _this._externalDispatchers.get(externalDispatcher);
//           return host?.host?.name == helperData;
//         };
//       case "cpu-usage":
//         helperData = {
//           arr: [],
//           timeout: null,
//           done: false,
//           finish: () => {
//             if (!helperData.done) {
//               // Now we find the Min CPU usage:
//               const bestOption = minOfArray(helperData.arr, "cpuUsage").index;

//               for (const [index, { resolve }] of (
//                 helperData.arr as any[]
//               ).entries()) {
//                 resolve(index === bestOption);
//               }

//               helperData.done = true;
//             }

//             if (helperData.timeout !== null) {
//               clearTimeout(helperData.timeout);
//               helperData.timeout = null;
//             }
//           },
//         };

//         return async (externalDispatcherId, options) => {
//           if (options.initalTest) {
//             return true;
//           }

//           let cpuUsage =
//             _this._externalDispatchers.get(externalDispatcherId).host.cpu.usage;
//           cpuUsage = cpuUsage === -1 ? Infinity : cpuUsage;

//           // For every Call, we
//           const promise = new Promise<boolean>((resolve) =>
//             helperData.arr.push({ resolve, cpuUsage })
//           );

//           // If we are calling the Element at the firsttime,
//           // we ensure, that we have callback, which will
//           // be called after the specified amount of time to
//           // assing the selection.
//           if (options.first) {
//             helperData.timeout = setTimeout(helperData.finish, options.timeout);
//           }

//           if (options.last) {
//             helperData.finish();
//           }

//           return await promise;
//         };
//       case "free-ram":
//         helperData = {
//           arr: [],
//           timeout: null,
//           done: false,
//           finish: () => {
//             if (!helperData.done) {
//               // Now we find the Min CPU usage:
//               const bestOption = minOfArray(helperData.arr, "freeRam").index;

//               for (const [index, { resolve }] of (
//                 helperData.arr as any[]
//               ).entries()) {
//                 resolve(index === bestOption);
//               }

//               helperData.done = true;
//             }

//             if (helperData.timeout !== null) {
//               clearTimeout(helperData.timeout);
//               helperData.timeout = null;
//             }
//           },
//         };

//         return async (externalDispatcherId, options) => {
//           if (options.initalTest) {
//             return true;
//           }

//           let freeRam =
//             _this._externalDispatchers.get(externalDispatcherId).host.ram.free;
//           freeRam = freeRam === -1 ? Infinity : freeRam;

//           // For every Call, we
//           const promise = new Promise<boolean>((resolve) =>
//             helperData.arr.push({ resolve, freeRam })
//           );

//           // If we are calling the Element at the firsttime,
//           // we ensure, that we have callback, which will
//           // be called after the specified amount of time to
//           // assing the selection.
//           if (options.first) {
//             helperData.timeout = setTimeout(helperData.finish, options.timeout);
//           }

//           if (options.last) {
//             helperData.finish();
//           }

//           return await promise;
//         };
//     }
//   }