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/*
 * =============================================================================
 *
 *   Copyright (c) 2011-2021, The THYMELEAF team (http://www.thymeleaf.org)
 *
 *   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 org.thymeleaf.spring5.web.webflux;

import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Locale;
import java.util.Map;

import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.MediaType;
import org.springframework.web.server.ServerWebExchange;
import org.thymeleaf.util.Validate;

/**
 *
 * @author Daniel Fernández
 *
 * @since 3.1.0
 *
 */
public class SpringWebFluxWebApplication implements ISpringWebFluxWebApplication {
// This class is made NOT final so that it can be proxied by Dependency Injection frameworks

    /*
     * There is no equivalent in Spring WebFlux to an application-level attribute container (e.g. ServletContext).
     * So for the attribute part of this interface, this implementation will simply keep an empty attribute map.
     */

    private final ReactiveAdapterRegistry reactiveAdapterRegistry;


    SpringWebFluxWebApplication(final ReactiveAdapterRegistry reactiveAdapterRegistry) {
        super();
        // reactiveAdapterRegistry can be null
        this.reactiveAdapterRegistry = reactiveAdapterRegistry;
    }


    public static SpringWebFluxWebApplication buildApplication(final ReactiveAdapterRegistry reactiveAdapterRegistry) {
        // reactiveAdapterRegistry can be null
        return new SpringWebFluxWebApplication(reactiveAdapterRegistry);
    }

    public ISpringWebFluxWebExchange buildExchange(
            final ServerWebExchange exchange, final Locale locale, final MediaType mediaType, final Charset charset) {

        Validate.notNull(exchange, "ServerWebExchange cannot be null");
        Validate.notNull(locale, "Locale cannot be null");
        Validate.notNull(mediaType, "Media Type cannot be null");
        Validate.notNull(charset, "Charset cannot be null");

        final SpringWebFluxWebRequest request = new SpringWebFluxWebRequest(exchange.getRequest());

        return new SpringWebFluxWebExchange(request, this, exchange, locale, mediaType, charset);

    }


    @Override
    public ReactiveAdapterRegistry getReactiveAdapterRegistry() {
        return this.reactiveAdapterRegistry;
    }

    @Override
    public Map getAttributes() {
        return Collections.emptyMap();
    }

    @Override
    public void setAttributeValue(final String name, final Object value) {
        Validate.notNull(name, "Name cannot be null");
        throw new UnsupportedOperationException("No support for application-level attributes in Spring WebFlux");
    }

    @Override
    public void removeAttribute(final String name) {
        Validate.notNull(name, "Name cannot be null");
        throw new UnsupportedOperationException("No support for application-level attributes in Spring WebFlux");
    }


    @Override
    public boolean resourceExists(final String path) {
        Validate.notNull(path, "Path cannot be null");
        throw new UnsupportedOperationException("No support for webapplication-based resource resolution in Spring WebFlux");
    }

    @Override
    public InputStream getResourceAsStream(final String path) {
        Validate.notNull(path, "Path cannot be null");
        throw new UnsupportedOperationException("No support for webapplication-based resource resolution in Spring WebFlux");
    }

}