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package net.gdface.facelog;

import static com.google.common.base.Preconditions.checkArgument;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Set;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.Maps;

import static net.gdface.utils.MiscellaneousUtils.*;

/**
 * feature相关配置参数管理类

 * @author guyadong
 *
 */
public class FeatureConfig implements ServiceConstant{
	
	public static final String MD5_OFFSET = "md5Offset";
	public static final String MD5_LENGTH = "md5Length";
	public static final FeatureConfig FEATURE_CONFIG = new FeatureConfig(); 
	private final LinkedHashMap sdkVersionWhiteList = Maps.newLinkedHashMap();
	private final int defaultFeatureLimitPerPerson;
	private final boolean featureAutoUpdate;
	private final static LoadingCache cacheMd5Offset = CacheBuilder.newBuilder()
			.build(new CacheLoader(){

				@Override
				public Integer load(String sdkVersion) throws Exception {
					return CONFIG.getInt(FEATURE_SDKVERSION_PREFIX + sdkVersion + "." + MD5_OFFSET, 0);
				}});
	private final static LoadingCache cacheMd5Len = CacheBuilder.newBuilder()
			.build(new CacheLoader(){

				@Override
				public Integer load(String sdkVersion) throws Exception {
					return CONFIG.getInt(FEATURE_SDKVERSION_PREFIX + sdkVersion +"." + MD5_LENGTH, -1);
				}});
	private FeatureConfig() {
		this.defaultFeatureLimitPerPerson = CONFIG.getInt(FEATURE_PERSON_LIMIT_DEFAULT, DEFAULT_FEATURE_PERSON_LIMIT);
		this.featureAutoUpdate = CONFIG.getBoolean(FEATURE_PERSON_UPDATE_AUTO ,true);
		for(String name : elementsOf(CONFIG.getString(FEATURE_SDKVERSION_WHITELIST,""))){
			sdkVersionWhiteList.put(name, CONFIG.getInt(FEATURE_PERSON_LIMIT_PREFIX + name, defaultFeatureLimitPerPerson));
		}

	}
	/** 
	 * 允许的SDK版本列表.

	 * 如果设备的SDK版本号不在名单内不允许注册 
	 */
	public Set getSdkVersionWhiteList(){
		return sdkVersionWhiteList.keySet();
	}

	/**
	 * 验证{@code sdkVersion}是否为有效的SDK版本号
	 * @param sdkVersion
	 * @return {@code sdkVersion}有效返回{@code true},否则返回{@code false}
	 */
	public boolean validateSdkVersion(String sdkVersion){
		return sdkVersionWhiteList.containsKey(sdkVersion);
	}
	/**
	 * 验证{@code sdkVersions}包含的SDK版本号是否都有效
	 * @param sdkVersions ','号分隔的SDK版本号的名字列表
	 * @return {@code sdkVersions}不为空且都有效返回{@code true},否则返回{@code false}
	 */
	public boolean allValidSdkVersions(String sdkVersions){
		List list = elementsOf(sdkVersions);
		return list.isEmpty() ? false : sdkVersionWhiteList.keySet().containsAll(list);
	}
	/**
	 * 验证{@code sdkVersion}是否为有效的SDK版本号,不是则抛出异常
	 * @param sdkVersion
	 * @return always {@code sdkVersion}
	 * @throws IllegalArgumentException 无效的SDK版本号
	 */
	public String checkSdkVersion(String sdkVersion) throws IllegalArgumentException{
		checkArgument(validateSdkVersion(sdkVersion),
				"UNKNOW sdk version : [%s]",sdkVersion);
		return sdkVersion;
	}

	/**
	 * @param sdkVersion
	 * @return 返回{@code sdkVersion}指定版本号的特征码数量限制
	 */
	public int getFeatureLimitPerPerson(String sdkVersion) {
		Integer limit = sdkVersionWhiteList.get(sdkVersion);
		return limit == null ? defaultFeatureLimitPerPerson : limit.intValue();
	}

	/**
	 * 
	 * @return 是否开启特征数据自动更新机制
	 */
	public boolean featureAutoUpdateEnabled() {
		return featureAutoUpdate;
	}
	/**
	 * 返回{@code sdkVersion}指定SDK版本定义的计算MD5的偏移量
	 * @param sdkVersion
	 * @return 大于等于0为有效值
	 */
	public int md5OffsetOf(String sdkVersion){
		return cacheMd5Offset.getUnchecked(sdkVersion);
	}
	/**
	 * 返回{@code sdkVersion}指定SDK版本定义的计算MD5的数据长度
	 * @param sdkVersion
	 * @return 大于0为有效值
	 */
	public int md5LengthOf(String sdkVersion){
		return cacheMd5Len.getUnchecked(sdkVersion);
	}
}