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/*
 * Sonar Switch Off Violations Plugin
 * Copyright (C) 2011 SonarSource
 * [email protected]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */

package org.sonar.plugins.switchoffviolations;

import java.util.Set;

import org.sonar.api.resources.Resource;
import org.sonar.api.rules.Rule;
import org.sonar.api.rules.Violation;
import org.sonar.api.utils.WildcardPattern;

import com.google.common.collect.Sets;

final class Pattern {

  private WildcardPattern resourcePattern;
  private WildcardPattern rulePattern;
  private Set lines = Sets.newLinkedHashSet();
  private Set lineRanges = Sets.newLinkedHashSet();
  private boolean checkLines = true;

  Pattern(String resourcePattern, String rulePattern) {
    this.resourcePattern = WildcardPattern.create(resourcePattern);
    this.rulePattern = WildcardPattern.create(rulePattern);
  }

  WildcardPattern getResourcePattern() {
    return resourcePattern;
  }

  WildcardPattern getRulePattern() {
    return rulePattern;
  }

  Pattern addLineRange(int fromLineId, int toLineId) {
    lineRanges.add(new LineRange(fromLineId, toLineId));
    return this;
  }

  Pattern addLine(int lineId) {
    lines.add(lineId);
    return this;
  }

  boolean isCheckLines() {
    return checkLines;
  }

  Pattern setCheckLines(boolean b) {
    this.checkLines = b;
    return this;
  }

  Set getAllLines() {
    Set allLines = Sets.newLinkedHashSet(lines);
    for (LineRange lineRange : lineRanges) {
      allLines.addAll(lineRange.toLines());
    }
    return allLines;
  }

  boolean match(Violation violation) {
    boolean match = matchResource(violation.getResource()) && matchRule(violation.getRule());
    if (match && checkLines && violation.getLineId() != null) {
      match = matchLine(violation.getLineId());
    }
    return match;
  }

  boolean matchLine(int lineId) {
    boolean match = lines.contains(lineId);
    if (!match) {
      for (LineRange range : lineRanges) {
        if (range.in(lineId)) {
          return true;
        }
      }
    }
    return match;
  }

  boolean matchRule(Rule rule) {
    if (rule != null) {
      String key = new StringBuilder().append(rule.getRepositoryKey()).append(':').append(rule.getKey()).toString();
      return rulePattern.match(key);
    }
    return false;
  }

  boolean matchResource(Resource resource) {
    return resource != null && resource.getKey() != null && resourcePattern.match(resource.getKey());
  }

  static final class LineRange {
    int from, to;

    LineRange(int from, int to) {
      if (to < from) {
        throw new IllegalArgumentException("Line range is not valid: " + from + " must be greater than " + to);
      }
      this.from = from;
      this.to = to;
    }

    boolean in(int lineId) {
      return from <= lineId && lineId <= to;
    }

    Set toLines() {
      Set lines = Sets.newLinkedHashSet();
      for (int index = from; index <= to; index++) {
        lines.add(index);
      }
      return lines;
    }
  }
}