package com.hotent.feign.mockmvc;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.hotent.feign.mockmvc.client.MockMvcClient;
import org.springframework.cloud.openfeign.FeignContext;

import feign.Client;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

public class MockMvcFeignContext extends FeignContext {
	private final MockMvcFeignObjectWrapper mockMvcFeignObjectWrapper;

	private final FeignContext delegate;

	public MockMvcFeignContext(MockMvcFeignObjectWrapper mockMvcFeignObjectWrapper, FeignContext delegate) {
		this.mockMvcFeignObjectWrapper = mockMvcFeignObjectWrapper;
		this.delegate = delegate;
	}

	/**
	 * 指定的feignclient 使用mockmvc进行转发，其他的feignclient使用http的方式转发
	 * @param name
	 * @param type
	 * @return
	 * @param <T>
	 */
	@SuppressWarnings("unchecked")
	@Override
	public <T> T getInstance(String name, Class<T> type) {
		T object = this.delegate.getInstance(name, type);
		if (object instanceof Client) {
			if(mockmvcContextId(name)){
				return (T) object;
			}
			if(object instanceof MockMvcClient){
				MockMvcClient mockMvcClient = (MockMvcClient) object;
				return (T) mockMvcClient.getDelegate();
			}
		}
		return (T) this.mockMvcFeignObjectWrapper.wrap(object);
	}

	private boolean mockmvcContextId(String name){
		//  可以指定哪些feignClient 使用MockMvcClient进行转发。
		List<String> mockmvcContextIdList = mockMvcFeignObjectWrapper.getApplicationContext().getEnvironment().getProperty("feign.mockmvcclient",List.class);
		return matchContextId(name, mockmvcContextIdList);
	}

	/**
	 * 匹配contextId, 匹配上的 需要进行mock方式转发feign请求
	 * @param name
	 * @param mockmvcContextIdList
	 * @return
	 */
	private static boolean matchContextId(String name, List<String> mockmvcContextIdList) {
		if(CollectionUtils.isEmpty(mockmvcContextIdList)) {
			return false;
		}
		AntPathMatcher antPathMatcher = new AntPathMatcher();
		// 支持antPathMatcher方式配置
		for (String contextId : mockmvcContextIdList) {
			if(antPathMatcher.match(contextId, name)){
				return true;
			}
		}
		return false;
	}

	@SuppressWarnings("unchecked")
	@Override
	public <T> Map<String, T> getInstances(String name, Class<T> type) {
		Map<String, T> instances = this.delegate.getInstances(name, type);
		if (instances == null) {
			return null;
		}
		Map<String, T> convertedInstances = new HashMap<>();
		for (Map.Entry<String, T> entry : instances.entrySet()) {
			if (entry.getValue() instanceof Client) {
				convertedInstances.put(entry.getKey(), entry.getValue());
			} else {
				convertedInstances.put(entry.getKey(), (T) this.mockMvcFeignObjectWrapper.wrap(entry.getValue()));
			}
		}
		return convertedInstances;
	}

}