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/*
 * Copyright ©2015-2023 Jaemon. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.jaemon.dinger.core;

import com.github.jaemon.dinger.constant.DingerConstant;
import com.github.jaemon.dinger.core.annatations.DingerImageText;
import com.github.jaemon.dinger.core.annatations.DingerLink;
import com.github.jaemon.dinger.core.entity.DingerMethod;
import com.github.jaemon.dinger.core.entity.enums.MessageMainType;
import com.github.jaemon.dinger.core.entity.enums.MessageSubType;
import com.github.jaemon.dinger.core.entity.xml.BeanTag;
import com.github.jaemon.dinger.core.entity.xml.MessageTag;
import com.github.jaemon.dinger.exception.DingerException;
import com.github.jaemon.dinger.utils.XmlUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.util.FileCopyUtils;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static com.github.jaemon.dinger.constant.DingerConstant.SPOT_SEPERATOR;
import static com.github.jaemon.dinger.core.entity.enums.ExceptionEnum.*;
import static com.github.jaemon.dinger.core.entity.enums.ExceptionEnum.LINK_METHOD_PARAM_EXCEPTION;
import static com.github.jaemon.dinger.utils.DingerUtils.methodParamsGenericType;
import static com.github.jaemon.dinger.utils.DingerUtils.methodParamsType;

/**
 * dinger定义-xml方式
 *
 * @author Jaemon
 * @since 1.2
 */
public class XmlDingerDefinitionResolver extends AbstractDingerDefinitionResolver {
    private static final Logger log = LoggerFactory.getLogger(XmlDingerDefinitionResolver.class);

    @Override
    public void resolver(Resource[] resources) {
        boolean debugEnabled = log.isDebugEnabled();
        for (Resource resource : resources) {
            if (!resource.isReadable()) {
                if (debugEnabled) {
                    log.debug("Ignored because not readable: {} ", resource.getFilename());
                }
                continue;
            }
            String xml;
            try {
                xml = new String(FileCopyUtils.copyToByteArray(resource.getInputStream()), "UTF-8");
            } catch (IOException e) {
                throw new DingerException(RESOURCE_CONFIG_EXCEPTION, resource.getFilename());
            }
            xml = transferXml(xml);
            BeanTag dingerBean = XmlUtils.xmlToJavaBean(xml, BeanTag.class);
            if (dingerBean == null) {
                if (debugEnabled) {
                    log.debug("dinger xml file: {} content is empty.", resource.getFilename());
                }
                continue;
            }
            String namespace = dingerBean.getNamespace();
            Class dingerClass;
            try {
                dingerClass = Class.forName(namespace);
            } catch (ClassNotFoundException e) {
                throw new DingerException(DINER_XML_NAMESPACE_INVALID, namespace);
            }

            Map dingerClassMethods = dingerClassMethods(dingerClass);

            DingerConfig dingerConfiguration = dingerConfiguration(dingerClass);

            List messages = dingerBean.getMessages();
            for (MessageTag message : messages) {
                String methodName = message.getIdentityId();
                if (!dingerClassMethods.containsKey(methodName)) {
                    if (debugEnabled) {
                        log.debug("namespace={}, messageId={} undefined in dingerClass.",
                                namespace, methodName);
                    }
                    continue;
                }
                String dingerName = namespace + SPOT_SEPERATOR + methodName;
                String messageSubType = message.getDingerType();
                if (!MessageSubType.contains(messageSubType)) {
                    throw new DingerException(DINER_XML_MSGTYPE_INVALID, dingerName, messageSubType);
                }
                String dingerDefinitionKey = MessageMainType.XML + SPOT_SEPERATOR + message.getDingerType();

                registerDingerDefinition(
                        dingerName, message,
                        dingerDefinitionKey,
                        dingerConfiguration,
                        dingerClassMethods.get(methodName)
                );
            }
        }
    }


    /**
     * 获取当前Dinger接口层方法的所有参数信息
     *
     * @param dingerClass
     *          Dinger接口层类
     * @return
     *          当前Dinger接口定义的方法的参数信息和泛型信息
     */
    protected Map dingerClassMethods(Class dingerClass) {
        Method[] methods = dingerClass.getMethods();
        Map dingerMethodParams = new HashMap<>();
        for (Method method : methods) {
            String methodName = method.getName();
            String methodAllName = dingerClass.getSimpleName() + DingerConstant.SPOT_SEPERATOR + methodName;
            int[] paramTypes = null;
            if (method.isAnnotationPresent(DingerImageText.class)) {
                paramTypes = methodParamsGenericType(method, DingerImageText.clazz);
                if (paramTypes.length != 1) {
                    throw new DingerException(IMAGETEXT_METHOD_PARAM_EXCEPTION, methodAllName);
                }
            } else if (method.isAnnotationPresent(DingerLink.class)) {
                paramTypes = methodParamsType(method, DingerLink.clazz);
                if (paramTypes.length != 1) {
                    throw new DingerException(LINK_METHOD_PARAM_EXCEPTION, methodAllName);
                }
            }
            String[] methodParams = parameterNameDiscoverer.getParameterNames(method);
            dingerMethodParams.put(methodName, new DingerMethod(methodAllName, methodParams, paramTypes));
        }
        return dingerMethodParams;
    }

    String transferXml(String sourceXml) {
        return sourceXml.replaceAll("", "");
    }
}