package com.foxinmy.weixin4j.wxa.api;
   
   import java.util.Properties;
   import java.util.ResourceBundle;
   import java.util.regex.Matcher;
   import java.util.regex.Pattern;
   
   import com.foxinmy.weixin4j.api.BaseApi;
   
  /**
   * @since 1.8
   */
  abstract class WxaApi extends BaseApi {
  
  	private static final ResourceBundle WEIXIN_BUNDLE;
  
  	static {
  		WEIXIN_BUNDLE = ResourceBundle
  			.getBundle("com/foxinmy/weixin4j/wxa/api/weixin");
  	}
  
  	private final Properties cache = new Properties();
  	private final Properties properties;
  	private final Pattern uriPattern = Pattern.compile("(\\{[^\\}]*\\})");
  
  	public WxaApi() {
  		this(null);
  	}
  
  	/**
  	 * Constructs {@link WxaApi} with specified {@code properties}.
  	 *
  	 * @param properties the properties to override the {@link #weixinBundle()}.
  	 */
  	public WxaApi(Properties properties) {
  		this.properties = properties;
  	}
  
  	@Override
  	protected ResourceBundle weixinBundle() {
  		return WEIXIN_BUNDLE;
  	}
  
  	@Override
  	protected String getRequestUri(String key) {
  		String url = this.cache.getProperty(key);
  		if (url != null) {
  			return url;
  		}
  
  		if (this.properties != null && (url = this.properties.getProperty(key)) != null) {
  			Matcher m = uriPattern.matcher(url);
  			StringBuffer sb = new StringBuffer();
  			String sub = null;
  			while (m.find()) {
  				sub = m.group();
  				m.appendReplacement(sb,
  					getRequestUri(sub.substring(1, sub.length() - 1)));
  			}
  			m.appendTail(sb);
  			url = sb.toString();
  		} else {
  			url = super.getRequestUri(key);
  		}
  
  		this.cache.setProperty(key, url);
  
  		return url;
  	}
  
  	String getRequestUri(String key, Object... args) {
  		return String.format(getRequestUri(key), args);
  	}
  
  }