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package ars.invoke;

import java.util.Map;
import java.util.Locale;
import java.util.HashMap;
import java.util.ResourceBundle;
import java.text.MessageFormat;

import ars.util.Strings;

/**
 * 消息国际化处理标准实现
 *
 * @author wuyongqiang
 */
public class StandardMessager implements Messager {
    private String[] resources = Strings.EMPTY_ARRAY;
    private Map localeBundles = new HashMap();

    public StandardMessager(String... resources) {
        if (resources == null || resources.length == 0) {
            throw new IllegalArgumentException("Resources must not be empty");
        }
        this.resources = resources;
    }

    /**
     * 获取指定语言环境对应的资源绑定对象
     *
     * @param locale 语言环境
     * @return 资源绑定对象数组
     */
    protected ResourceBundle[] getBundles(Locale locale) {
        ResourceBundle[] bundles = this.localeBundles.get(locale);
        if (bundles == null) {
            synchronized (this) {
                if ((bundles = this.localeBundles.get(locale)) == null) {
                    bundles = new ResourceBundle[this.resources.length];
                    for (int i = 0; i < bundles.length; i++) {
                        bundles[i] = ResourceBundle.getBundle(this.resources[i], locale);
                    }
                    this.localeBundles.put(locale, bundles);
                }
            }
        }
        return bundles;
    }

    /**
     * 获取消息内容
     *
     * @param locale 语言环境
     * @param key    消息索引
     * @param text   消息默认值
     * @return 消息内容
     */
    protected String getMessage(Locale locale, String key, String text) {
        ResourceBundle[] bundles = this.getBundles(locale);
        if (bundles != null) {
            for (ResourceBundle bundle : bundles) {
                if (bundle.containsKey(key)) {
                    return bundle.getString(key);
                }
            }
        }
        return text;
    }

    @Override
    public String format(Locale locale, String key, Object[] args) {
        return this.format(locale, key, args, key);
    }

    @Override
    public String format(Locale locale, String key, Object[] args, String text) {
        String message = this.getMessage(locale, key, text);
        return args == null || args.length == 0 ? message : MessageFormat.format(message, args);
    }

}