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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.css.io;

import br.com.objectos.codereader.CodeReader;
import br.com.objectos.codereader.Keyword;
import br.com.objectos.css.Selector;

/**
 * @author [email protected] (Marcio Endo)
 */
enum AttributeOperator {

  WS_LIST("~=") {
    @Override
    public boolean matches(String expression, String actual) {
      String[] parts = actual.split("\\s");
      for (String part : parts) {
        if (expression.equals(part)) {
          return true;
        }
      }
      return false;
    }
  },

  STARTS_WITH("^=") {
    @Override
    public boolean matches(String expression, String actual) {
      return actual.startsWith(expression);
    }
  },

  ENDS_WITH("$=") {
    @Override
    public boolean matches(String expression, String actual) {
      return actual.endsWith(expression);
    }
  },

  CONTAINS("*=") {
    @Override
    public boolean matches(String expression, String actual) {
      return actual.contains(expression);
    }
  },

  HYPHEN("|=") {
    @Override
    public boolean matches(String expression, String actual) {
      boolean matches = false;
      String[] parts = actual.split("-");
      if (parts.length > 0) {
        matches = parts[0].equals(expression);
      }
      return matches;
    }
  },

  EQUALS("=") {
    @Override
    public boolean matches(String expression, String actual) {
      return expression.equals(actual);
    }
  },

  ATTRIBUTE(Keyword.of(']')) {
    @Override
    public boolean matches(String expression, String actual) {
      return actual != null;
    }

    @Override
    boolean hasValue() {
      return false;
    }
  };

  private final String value;
  private final Keyword keyword;

  private AttributeOperator(String value) {
    this.value = value;
    keyword = Keyword.of(value);
  }

  private AttributeOperator(Keyword keyword) {
    value = "";
    this.keyword = keyword;
  }

  public abstract boolean matches(String expression, String actual);

  @Override
  public String toString() {
    return value;
  }

  void deleteKeyword(CodeReader reader) {
    reader.deleteKeyword(keyword);
  }

  boolean matches(CodeReader reader) {
    return keyword.matches(reader);
  }

  Selector selector(String attribute, String value) {
    return new AttributeSelector(attribute, value, this);
  }

  boolean hasValue() {
    return true;
  }

}