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/*
 *   Copyright (c) 2023. Ned Wolpert 
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *
 */

package com.codeheadsystems.gamelib.hex.manager;

import static com.codeheadsystems.gamelib.core.util.LoggerHelper.logger;

import com.badlogic.gdx.utils.Logger;
import com.codeheadsystems.gamelib.core.util.PoolerImpl;
import com.codeheadsystems.gamelib.hex.model.FractionalHex;
import com.codeheadsystems.gamelib.hex.model.Hex;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import javax.inject.Inject;
import javax.inject.Singleton;

/**
 * The type Fractional hex manager.
 */
@Singleton
public class FractionalHexManager extends PoolerImpl {

  private static final Logger LOGGER = logger(FractionalHexManager.class);
  private final HexManager hexManager;

  /**
   * Instantiates a new Fractional hex manager.
   *
   * @param hexManager the hex manager
   */
  @Inject
  public FractionalHexManager(final HexManager hexManager) {
    super(FractionalHex::new);
    this.hexManager = hexManager;
    LOGGER.debug("FractionalHexManager()");
  }

  /**
   * Does not free old hexes.
   *
   * @param a the a
   * @param b the b
   * @return the list
   */
  public List hexLinedraw(final Hex a, final Hex b) {
    final int n = hexManager.distance(a, b);
    final FractionalHex a_nudge = obtain().setQ(a.q() + 1e-06).setR(a.r() + 1e-06).setS(a.s() - 2e-06).checkConstructorArguments();
    final FractionalHex b_nudge = obtain().setQ(b.q() + 1e-06).setR(b.r() + 1e-06).setS(b.s() - 2e-06).checkConstructorArguments();
    final double step = 1.0 / Math.max(n, 1);
    final List collect = IntStream.rangeClosed(0, n)
        .mapToObj(i -> hexRound(hexLerp(a_nudge, b_nudge, step * i), true))
        .collect(Collectors.toList());
    free(a_nudge);
    free(b_nudge);
    return collect;
  }

  /**
   * Hex round hex.
   *
   * @param fractionalHex the fractional hex
   * @param freeOld       the free old
   * @return the hex
   */
  public Hex hexRound(final FractionalHex fractionalHex, boolean freeOld) {
    int qi = (int) (Math.round(fractionalHex.q()));
    int ri = (int) (Math.round(fractionalHex.r()));
    int si = (int) (Math.round(fractionalHex.s()));
    final double q_diff = Math.abs(qi - fractionalHex.q());
    final double r_diff = Math.abs(ri - fractionalHex.r());
    final double s_diff = Math.abs(si - fractionalHex.s());
    if (q_diff > r_diff && q_diff > s_diff) {
      qi = -ri - si;
    } else if (r_diff > s_diff) {
      ri = -qi - si;
    } else {
      si = -qi - ri;
    }
    final Hex result = hexManager.obtain().setQ(qi).setR(ri).setS(si);
    if (freeOld) {
      free(fractionalHex);
    }
    return result;
  }

  /**
   * Does not free old FractionalHex.
   *
   * @param a the a
   * @param b the b
   * @param t the t
   * @return the fractional hex
   */
  public FractionalHex hexLerp(final FractionalHex a, final FractionalHex b, final double t) {
    return obtain()
        .setQ(a.q() * (1.0 - t) + b.q() * t)
        .setR(a.r() * (1.0 - t) + b.r() * t)
        .setS(a.s() * (1.0 - t) + b.s() * t)
        .checkConstructorArguments();
  }
}




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