import { logger } from "@/utils/logger";

export const openBackTrainInfo = (stationInfo, trainData, showNearTrain) => {
  const migrationArray = (stationInfo) => {
    const mainTrainStationPosition = trainData.findIndex(
      (d) => d.split(",")[0] == stationInfo
    );

    const relationMain = (() => {
      if (mainTrainStationPosition == 0) return "head";
      if (mainTrainStationPosition == trainData.length - 1) return "tail";
      return "middle";
    })();

    const subTrainStationPosition = showNearTrain.findIndex(
      (d) => d.split(",")[0] == stationInfo
    );
    const relationSub = (() => {
      if (subTrainStationPosition == 0) return "head";
      if (subTrainStationPosition == showNearTrain.length - 1) return "tail";
      return "middle";
    })();
    
    if (__DEV__) {
      logger.debug('Relation data:', relationMain, relationSub);
    }
    switch (relationMain) {
      case "head":
        if (relationSub == "head") {
          return;
        } else if (relationSub == "tail") {
          return [...showNearTrain, ...trainData];
        } else if (relationSub == "middle") {
          if (
            showNearTrain[subTrainStationPosition].split(",")[1].includes("着")
          ) {
            return [
              ...showNearTrain.slice(0, subTrainStationPosition + 1),
              ...trainData,
            ];
          } else {
            return [
              ...showNearTrain.slice(0, subTrainStationPosition),
              ...trainData,
            ];
          }
        } else return;
      case "tail":
        if (relationSub == "head") {
          return [...trainData, ...showNearTrain];
        } else if (relationSub == "tail") {
          return;
        } else if (relationSub == "middle") {
          if (
            showNearTrain[subTrainStationPosition].split(",")[1].includes("着")
          ) {
            return [
              ...trainData,
              ...showNearTrain.slice(subTrainStationPosition + 1),
            ];
          } else {
            return [
              ...trainData,
              ...showNearTrain.slice(subTrainStationPosition),
            ];
          }
        } else return;
      case "middle": //現状使わない
        if (relationSub == "head") {
          return [
            ...trainData.slice(0, mainTrainStationPosition),
            ...showNearTrain,
          ];
        } else if (relationSub == "tail") {
          return [
            ...showNearTrain.slice(0, subTrainStationPosition),
            ...trainData.slice(mainTrainStationPosition),
          ];
        } else return;
    }
  };
  const array = migrationArray(stationInfo);
  if (!array) return null;
  return array;
};