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/*
 * Copyright 2017 - 2023 the original author or authors.
 *
 * 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 [http://www.gnu.org/licenses/]
 */

package cn.taketoday.buildpack.platform.build;

import java.util.Comparator;

import cn.taketoday.lang.Assert;

/**
 * A lifecycle version number comprised of a major, minor and patch value.
 *
 * @author Phillip Webb
 * @author Harry Yang
 * @since 4.0
 */
class LifecycleVersion implements Comparable {

  private static final Comparator COMPARATOR =
          Comparator.comparingInt(LifecycleVersion::getMajor)
                  .thenComparingInt(LifecycleVersion::getMinor)
                  .thenComparing(LifecycleVersion::getPatch);

  private final int major;

  private final int minor;

  private final int patch;

  LifecycleVersion(int major, int minor, int patch) {
    this.major = major;
    this.minor = minor;
    this.patch = patch;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }
    LifecycleVersion other = (LifecycleVersion) obj;
    boolean result = this.major == other.major;
    result = result && this.minor == other.minor;
    result = result && this.patch == other.patch;
    return result;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + this.major;
    result = prime * result + this.minor;
    result = prime * result + this.patch;
    return result;
  }

  @Override
  public String toString() {
    return "v" + this.major + "." + this.minor + "." + this.patch;
  }

  /**
   * Return if this version is greater than or equal to the specified version.
   *
   * @param other the version to compare
   * @return {@code true} if this version is greater than or equal to the specified
   * version
   */
  boolean isEqualOrGreaterThan(LifecycleVersion other) {
    return compareTo(other) >= 0;
  }

  @Override
  public int compareTo(LifecycleVersion other) {
    return COMPARATOR.compare(this, other);
  }

  /**
   * Return the major version number.
   *
   * @return the major version
   */
  int getMajor() {
    return this.major;
  }

  /**
   * Return the minor version number.
   *
   * @return the minor version
   */
  int getMinor() {
    return this.minor;
  }

  /**
   * Return the patch version number.
   *
   * @return the patch version
   */
  int getPatch() {
    return this.patch;
  }

  /**
   * Factory method to parse a string into a {@link LifecycleVersion} instance.
   *
   * @param value the value to parse.
   * @return the corresponding {@link LifecycleVersion}
   * @throws IllegalArgumentException if the value could not be parsed
   */
  static LifecycleVersion parse(String value) {
    Assert.hasText(value, "Value must not be empty");
    if (value.startsWith("v") || value.startsWith("V")) {
      value = value.substring(1);
    }
    String[] components = value.split("\\.");
    Assert.isTrue(components.length <= 3, "Malformed version number '" + value + "'");
    int[] versions = new int[3];
    for (int i = 0; i < components.length; i++) {
      try {
        versions[i] = Integer.parseInt(components[i]);
      }
      catch (NumberFormatException ex) {
        throw new IllegalArgumentException("Malformed version number '" + value + "'", ex);
      }
    }
    return new LifecycleVersion(versions[0], versions[1], versions[2]);
  }

}