package ch.qos.logback.core.boolex;

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import ch.qos.logback.core.spi.ContextAwareBase;
import ch.qos.logback.core.spi.LifeCycle;

public class Matcher extends ContextAwareBase implements LifeCycle {

  private String regex;
  private String name;
  private boolean caseSensitive = true;
  private boolean canonEq = false;
  private boolean unicodeCase = false;

  private boolean start = false;
  private Pattern pattern;

  public String getRegex() {
    return regex;
  }

  public void setRegex(String regex) {
    this.regex = regex;
  }

  public void start() {
    if(name ==  null) {
      addError("All Matcher objects must be named");
      return;
    }
    try {
      int code = 0;
      if(!caseSensitive) {
        code |= Pattern.CASE_INSENSITIVE; 
      }
      if(canonEq) {
        code |= Pattern.CANON_EQ;
      }
      if(unicodeCase) {
        code |= Pattern.UNICODE_CASE; 
      }
      
      
      pattern = Pattern.compile(regex, code);
      start = true;
    } catch (PatternSyntaxException pse) {
      addError("Failed to compile regex [" + regex + "]", pse);
    }
  }

  public void stop() {
    start = false;
  }

  public boolean isStarted() {
    return start;
  }

  //However, this method does 
  //not require that the entire region (of the input) be matched.
  
  /**
   * Checks whether the input matches the regular expression. 
   * 
   * @param input
   * @return
   * @throws EvaluationException
   */
  public boolean matches(String input) throws EvaluationException {
    if(start) {
      java.util.regex.Matcher matcher = pattern.matcher(input);
      return matcher.matches();
    } else {
      throw new EvaluationException("Matcher ["+regex+"] not started");
    }
  }

  public boolean isCanonEq() {
    return canonEq;
  }

  public void setCanonEq(boolean canonEq) {
    this.canonEq = canonEq;
  }

  public boolean isCaseSensitive() {
    return caseSensitive;
  }

  public void setCaseSensitive(boolean caseSensitive) {
    this.caseSensitive = caseSensitive;
  }

  public boolean isUnicodeCase() {
    return unicodeCase;
  }

  public void setUnicodeCase(boolean unicodeCase) {
    this.unicodeCase = unicodeCase;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}
