import VoxelSpace from "./VoxelSpace.js";
import SomaSolution from "./SomaSolution.js";
export default class SomaSolver {
    constructor(dimension) {
        this.solutions = [];
        this.iterations = 0;
        if (dimension % 1 !== 0 || dimension < 0) {
            throw new Error("The argument 'dimension' must be a positive whole number");
        }
        this.dim = dimension;
        this.solutionCube = new VoxelSpace(0, [dimension, dimension, dimension], Array(dimension ** 3).fill(0));
    }
    async solve(polycubes) {
        if (polycubes.length === 0) {
            throw new Error("You must pass at least one polycube to solve the puzzle.");
        }
        let cumulativeSize = polycubes.reduce((prev, curr) => prev + curr.size(), 0);
        if (cumulativeSize !== this.dim ** 3) {
            throw new Error(`The polycubes passed do not add up to exactly enough units to form a cube of dimension ${this.dim}! Got: ${cumulativeSize}, need: ${this.dim ** 3}`);
        }
        this.solutions = [];
        const combosWithRots = polycubes.slice(1).map(polycube => polycube.getUniqueRotations().map((rot) => rot.getAllPositionsInCube(this.dim)).flat());
        const combos = [polycubes[0].getAllPositionsInCube(this.dim), ...combosWithRots];
        this.backtrackSolve(this.solutionCube, combos, new SomaSolution(this.dim));
        this.solutions = SomaSolution.filterUnique(this.solutions);
    }
    getSolutions() {
        return this.solutions.slice();
    }
    backtrackSolve(workingSolution, polycubes, currentSoln) {
        const nextCubeGroup = polycubes[0];
        for (let i = 0; i < nextCubeGroup.length; i++) {
            const fusionAttempt = workingSolution.plus(nextCubeGroup[i]);
            if (fusionAttempt) {
                const nextSoln = currentSoln.clone();
                nextSoln.addSpace(nextCubeGroup[i]);
                if (polycubes.length === 1) {
                    this.solutions.push(nextSoln);
                    currentSoln = new SomaSolution(this.dim);
                    return;
                }
                else {
                    this.backtrackSolve(fusionAttempt, polycubes.slice(1), nextSoln);
                }
            }
        }
    }
}