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/**
 *   Copyright 2012-2013 Wicked Charts (http://wicked-charts.googlecode.com)
 *
 *   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.googlecode.wickedcharts.highcharts.options;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

/**
 * Option to allow CSS styles in a chart.
 * 
 * @see http://api.highcharts.com/highcharts#chart.style
 * @author Matthias Balke ([email protected])
 * 
 */
public class CssStyle implements Serializable {

  private static final long serialVersionUID = 1L;

  private Map properties;

  public CssStyle() {
  }

  public Map getProperties() {
    if (this.properties == null) {
      return new HashMap();
    } else {
      return this.properties;
    }
  }

  public String getProperty(final String key) {
    if (this.properties == null) {
      return null;
    } else {
      return this.properties.get(key);
    }
  }

  /**
   * Sets a CSS property.
   * 
   * @param key
   *          the name of the property. Note that hyphen notation ("-") is
   *          automatically converted into camel case notation since the
   *          property name is used as key in a JSON object. Highcharts will
   *          evaluate it as if it were hyphen notation.
   * @param value
   *          the value of the CSS property.
   * @return this for chaining.
   */
  public CssStyle setProperty(final String key, final String value) {
    if (this.properties == null) {
      this.properties = new HashMap();
    }
    this.properties.put(sanitizeCssPropertyName(key), value);
    return this;
  }

  /**
   * Replaces hyphen notation with camel case notation.
   * 
   * @param propertyName
   *          the name of the CSS property to sanitize
   * @return the sanitized CSS property name
   */
  private String sanitizeCssPropertyName(final String propertyName) {
    if (!propertyName.contains("-")) {
      return propertyName;
    } else {
      String sanitized = propertyName;
      int index = sanitized.indexOf('-');
      while (index != -1) {
        String charToBeReplaced = sanitized.substring(index + 1, index + 2);
        String replacement = charToBeReplaced.toUpperCase();
        sanitized = sanitized.replaceAll("-" + charToBeReplaced, replacement);
        index = sanitized.indexOf('-');
      }
      return sanitized;
    }
  }

}