/*
 * Minosoft
 * Copyright (C) 2020-2023 Moritz Zwerger
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * This software is not affiliated with Mojang AB, the original developer of Minecraft.
 */

package de.bixilon.minosoft.data.registries.shapes.side

import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet

class VoxelSideSet(
    val sides: Set<VoxelSide>,
) : Iterable<VoxelSide> {

    fun isEmpty(): Boolean = sides.isEmpty()

    override fun iterator(): Iterator<VoxelSide> {
        return sides.iterator()
    }

    fun compact(): VoxelSideSet {
        if (this.sides.size <= 1) {
            return this
        }

        val next: MutableSet<VoxelSide> = ObjectOpenHashSet()

        val array = this.sides.toTypedArray()
        for (i in 1 until sides.size) {
            next += array[i - 1].compact(array[i])
        }
        val set = VoxelSideSet(next)

        if (next.size < this.sides.size) {
            return set.compact()
        }

        return set
    }
}
