import { Logger } from '@nestjs/common';
import { IBacktrackingModel } from './backtracking-model.interface';

export abstract class ABacktracker {
  protected readonly logger = new Logger(this.constructor.name);

  abstract doBacktrack: () => boolean[][];

  protected findSolution = (dataModel: IBacktrackingModel): boolean => {
    if (dataModel.solved()) return true;

    // nächstes freie Position suchen
    // const nxtPossPos = dataModel.nextPossiblePosition();

    while (dataModel.nextPossiblePosition()) {
      dataModel.applyPosition();

      // Lösung mit dem neu konfigurierten dataObject finden
      const solved: boolean = this.findSolution(dataModel);

      if (solved) return true;

      const afterDiscardedPos = dataModel.discardPosition();
      this.logger.debug(`afterDiscardedPos: ${afterDiscardedPos}`);
    }

    return false;
  };

  protected ___findSolution___ = (dataModel: IBacktrackingModel): boolean => {
    if (dataModel.solved()) return true;

    // dataModel.options.forEach((option) => {
    while (dataModel.hasNext()) {
      // nächstes freie Position suchen
      const nxtPos = dataModel.nextPosition();
      this.logger.debug(`nxtPos: ${nxtPos}`);

      // darf die Option hier eingestellt werden ?
      if (dataModel.positionPossible()) {
        dataModel.applyPosition();

        // Lösung mit dem neu konfigurierten dataObject finden
        const solved: boolean = this.findSolution(dataModel);

        if (solved) return true;

        const afterDiscardedPos = dataModel.discardPosition();
        this.logger.debug(`afterDiscardedPos: ${afterDiscardedPos}`);
      }
    }

    return false;
  };
}