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package com.ksyun.api.sdk.http;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;

public class ObjectPlaceholderResolver implements PlaceholderResolver {

	private static final Logger logger = LoggerFactory.getLogger(ObjectPlaceholderResolver.class);

	private Map placeholders;

	public ObjectPlaceholderResolver(Object... objs) {
		this.placeholders = new HashMap();
		this.findGetMethods(objs);
	}

	@Override
	public String resolvePlaceholder(String placeholder_name) {
		Object obj = this.placeholders.get(placeholder_name);
		if (obj == null) {
			throw new IllegalStateException(String.format("can't resolve placeholder %s from %s property",
					placeholder_name, obj));
		}

		String get_method_name = String.format("get%s", StringUtils.capitalize(placeholder_name));

		Method m = ReflectionUtils.findMethod(obj.getClass(), get_method_name);
		Object v = ReflectionUtils.invokeMethod(m, obj);

		if (v == null || StringUtils.isEmpty(v.toString())) {
			throw new IllegalStateException(String.format("can't resolve placeholder %s from %s property.",
					placeholder_name, obj));
		}
		String value = v.toString();
		logger.debug("resolve placeholder {}={} from {} property", placeholder_name, value, obj);
		return value;
	}

	private void findGetMethods(Object... objs) {
		for (Object obj : objs) {
			Method[] methods = obj.getClass().getMethods();
			for (Method m : methods) {
				String method_name = m.getName();
				if (method_name.startsWith("get")) {
					String t = method_name.substring(3);
					String placeholder = StringUtils.uncapitalize(t);
					this.placeholders.put(placeholder, obj);
				}
			}
		}
	}
}