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/*******************************************************************************
 * Copyright (C) 2022-2023 WaveMaker, Inc.
 *
 * 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.wavemaker.runtime.rest.handler;

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

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.mvc.condition.ConsumesRequestCondition;
import org.springframework.web.servlet.mvc.condition.HeadersRequestCondition;
import org.springframework.web.servlet.mvc.condition.ParamsRequestCondition;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.condition.ProducesRequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestMethodsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import com.wavemaker.commons.MessageResource;
import com.wavemaker.commons.WMRuntimeException;
import com.wavemaker.runtime.rest.controller.RestRuntimeController;
import com.wavemaker.runtime.rest.model.RestServiceInfoBean;
import com.wavemaker.runtime.rest.model.RestServiceInfoBeanEntry;

/**
 * Created by ArjunSahasranam on 6/10/15.
 */

/**
 * Registers REST API urls to SimpleUrlHandlerMapping.
 */
public class RestServiceBeanPostProcessor implements BeanPostProcessor {

    @Autowired
    private RestRuntimeController restRuntimeController;

    @Autowired
    private ApplicationContext applicationContext;

    private RequestMappingHandlerMapping requestMappingHandlerMapping;

    @PostConstruct
    private void init() {
        Map beans = applicationContext
            .getBeansOfType(RequestMappingHandlerMapping.class);
        if (beans == null || beans.size() == 0) {
            throw new WMRuntimeException(MessageResource.create("com.wavemaker.runtime.requestMappingHandlerMapping.not.found"), applicationContext);
        } else {
            for (RequestMappingHandlerMapping bean : beans.values()) {
                if (bean.getApplicationContext() == applicationContext) {
                    requestMappingHandlerMapping = bean;
                    break;
                }
            }
            if (requestMappingHandlerMapping == null) {
                throw new WMRuntimeException(MessageResource.create("com.wavemaker.runtime.requestMappingHandlerMapping.not.found"), applicationContext);
            }
        }
    }

    private static final Method HANDLE_REQUEST_METHOD;

    static {
        try {
            HANDLE_REQUEST_METHOD = RestRuntimeController.class
                .getDeclaredMethod("handleRequest", HttpServletRequest.class, HttpServletResponse.class);
        } catch (NoSuchMethodException e) {
            throw new WMRuntimeException(MessageResource.create("com.wavemaker.runtime.method.not.found"), e);
        }
    }

    @Override
    public Object postProcessBeforeInitialization(final Object bean, final String beanName) {
        if (bean instanceof RestServiceInfoBean) {
            RestServiceInfoBean restServiceInfoBean = (RestServiceInfoBean) bean;
            restServiceInfoBean.getEntryList().forEach(restInfoEntry -> {
                RequestMappingInfo requestMappingInfo = getRequestMappingInfo(restInfoEntry);
                requestMappingHandlerMapping
                    .registerMapping(requestMappingInfo, restRuntimeController, HANDLE_REQUEST_METHOD);
            });
        }
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(final Object bean, final String beanName) {
        return bean;
    }

    private RequestMappingInfo getRequestMappingInfo(RestServiceInfoBeanEntry restServiceEntry) {
        RequestMethodsRequestCondition methods = new RequestMethodsRequestCondition(
            RequestMethod.valueOf(restServiceEntry.getHttpMethod()));
        PatternsRequestCondition patterns = new PatternsRequestCondition(restServiceEntry.getUrl());
        ParamsRequestCondition params = new ParamsRequestCondition();
        HeadersRequestCondition headers = new HeadersRequestCondition();
        ConsumesRequestCondition consumes = new ConsumesRequestCondition();
        ProducesRequestCondition produces = new ProducesRequestCondition();
        return new RequestMappingInfo(restServiceEntry.getMethodName(), patterns, methods, params, headers, consumes, produces, null);
    }
}