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/*
 * Copyright (C) 2018  Sun.Hao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package lodsve.mvc.resolver;

import lodsve.mvc.annotation.WebResource;
import lodsve.mvc.commons.FileWebInput;
import lodsve.mvc.commons.WebInput;
import lodsve.mvc.commons.WebOutput;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

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

/**
 * 为controller注入参数WebInput/WebOutput/FileWebInput.
 *
 * @author sunhao([email protected])
 * @version V1.0, 15/7/7 上午9:20
 */
public class WebResourceDataHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        WebResource inject = parameter.getParameterAnnotation(WebResource.class);
        Class paramType = parameter.getParameterType();

        return inject != null && (WebInput.class.equals(paramType) || WebOutput.class.equals(paramType)
                || FileWebInput.class.equals(paramType));
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
        HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);

        Class paramType = parameter.getParameterType();

        if (paramType.equals(WebInput.class)) {
            return new WebInput(request);
        } else if (paramType.equals(WebOutput.class)) {
            return new WebOutput(response);
        } else if (paramType.equals(FileWebInput.class)) {
            return new FileWebInput(request);
        }

        return null;
    }
}