/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.shenyu.plugin.httpclient;

import org.apache.shenyu.common.constant.Constants;
import org.apache.shenyu.common.enums.PluginEnum;
import org.apache.shenyu.common.enums.RpcTypeEnum;
import org.apache.shenyu.plugin.api.ShenyuPluginChain;
import org.apache.shenyu.plugin.api.context.ShenyuContext;
import org.apache.shenyu.plugin.api.result.ShenyuResult;
import org.apache.shenyu.plugin.api.utils.SpringBeanUtils;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.mockito.junit.jupiter.MockitoSettings;
import org.mockito.quality.Strictness;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
import org.springframework.mock.web.server.MockServerWebExchange;
import org.springframework.web.reactive.function.client.ClientRequest;
import org.springframework.web.reactive.function.client.ClientResponse;
import org.springframework.web.reactive.function.client.ExchangeFunction;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;

import java.net.URI;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * The test case for WebClientPlugin.
 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
public final class WebClientPluginTest {

    @Mock
    private ExchangeFunction exchangeFunction;

    @Captor
    private ArgumentCaptor<ClientRequest> captor;

    private WebClientPlugin webClientPlugin;

    @BeforeEach
    public void setup() {
        ConfigurableApplicationContext context = mock(ConfigurableApplicationContext.class);
        SpringBeanUtils.getInstance().setApplicationContext(context);
        when(context.getBean(ShenyuResult.class)).thenReturn(mock(ShenyuResult.class));

        WebClient webClient = mockWebClientOK();
        webClientPlugin = new WebClientPlugin(webClient);
    }

    /**
     * test case for WebClientPlugin {@link WebClientPlugin#execute(ServerWebExchange, ShenyuPluginChain)}.
     */
    @Test
    public void testExecuted() {
        final ShenyuPluginChain chainNoPathTest = mock(ShenyuPluginChain.class);
        final WebClient webClientNoPathTest = mockWebClientOK();
        ServerWebExchange exchangeNoPathTest = MockServerWebExchange
                .from(MockServerHttpRequest.get("/test").build());
        exchangeNoPathTest.getAttributes().put(Constants.CONTEXT, mock(ShenyuContext.class));
        WebClientPlugin webClientPluginNoPathTest = new WebClientPlugin(webClientNoPathTest);
        Mono<Void> monoNoPathTest = webClientPluginNoPathTest.execute(exchangeNoPathTest, chainNoPathTest);
        StepVerifier.create(monoNoPathTest).expectSubscription().verifyComplete();

        final ShenyuPluginChain chainPostTest = mock(ShenyuPluginChain.class);
        final WebClient webClientPostTest = mockWebClientOK();
        ServerWebExchange exchangePostTest = MockServerWebExchange
                .from(MockServerHttpRequest.post("/test123?param=1").build());
        exchangePostTest.getAttributes().put(Constants.CONTEXT, mock(ShenyuContext.class));
        exchangePostTest.getAttributes().put(Constants.HTTP_URI, URI.create("/test123?param=1"));
        WebClientPlugin webClientPluginPostTest = new WebClientPlugin(webClientPostTest);
        Mono<Void> monoPostTest = webClientPluginPostTest.execute(exchangePostTest, chainPostTest);
        StepVerifier.create(monoPostTest).expectSubscription().verifyError();

        final ShenyuPluginChain chainOkTest = mock(ShenyuPluginChain.class);
        final WebClient webClientOkTest = mockWebClientOK();
        WebClientPlugin webClientPluginOkTest = new WebClientPlugin(webClientOkTest);
        Mono<Void> monoOkTest = webClientPluginOkTest.execute(generateServerWebExchange(), chainOkTest);
        StepVerifier.create(monoOkTest).expectSubscription().verifyError();

        final ShenyuPluginChain chainErrorTest = mock(ShenyuPluginChain.class);
        final WebClient webClientErrorTest = mockWebClientError();
        WebClientPlugin webClientPluginErrorTest = new WebClientPlugin(webClientErrorTest);
        Mono<Void> monoErrorTest = webClientPluginErrorTest.execute(generateServerWebExchange(), chainErrorTest);
        StepVerifier.create(monoErrorTest).expectSubscription().verifyError();
    }

    /**
     * test case for WebClientPlugin {@link WebClientPlugin#skip(ServerWebExchange)}.
     */
    @Test
    public void testSkip() {
        ServerWebExchange exchangeNormal = generateServerWebExchange();
        assertTrue(webClientPlugin.skip(exchangeNormal));

        ServerWebExchange exchangeHttp = generateServerWebExchange();
        when(((ShenyuContext) exchangeHttp.getAttributes().get(Constants.CONTEXT)).getRpcType())
                .thenReturn(RpcTypeEnum.HTTP.getName());
        assertFalse(webClientPlugin.skip(exchangeHttp));
    }

    /**
     * test case for WebClientPlugin {@link WebClientPlugin#getOrder()}.
     */
    @Test
    public void testGetOrder() {
        assertEquals(PluginEnum.WEB_CLIENT.getCode(), webClientPlugin.getOrder());
    }

    /**
     * test case for WebClientPlugin {@link WebClientPlugin#named()}.
     */
    @Test
    public void testNamed() {
        assertEquals(PluginEnum.WEB_CLIENT.getName(), webClientPlugin.named());
    }

    private ServerWebExchange generateServerWebExchange() {
        ServerWebExchange exchange = MockServerWebExchange.from(MockServerHttpRequest.get("/test").build());
        exchange.getAttributes().put(Constants.CONTEXT, mock(ShenyuContext.class));
        exchange.getAttributes().put(Constants.HTTP_URI, URI.create("/test"));
        return exchange;
    }

    private WebClient mockWebClientOK() {
        final ClientResponse.Headers headers = mock(ClientResponse.Headers.class);
        when(headers.asHttpHeaders()).thenReturn(new HttpHeaders());
        
        final ClientResponse mockResponse = mock(ClientResponse.class);
        when(mockResponse.statusCode()).thenReturn(HttpStatus.OK);
        when(mockResponse.headers()).thenReturn(headers);
        when(mockResponse.bodyToMono(byte[].class)).thenReturn(Mono.just("{\"test\":\"ok\"}".getBytes()));
        when(mockResponse.releaseBody()).thenReturn(Mono.empty());
        given(this.exchangeFunction.exchange(this.captor.capture())).willReturn(Mono.just(mockResponse));
        return WebClient.builder().baseUrl("/test")
                .exchangeFunction(this.exchangeFunction)
                .apply(consumer -> consumer.defaultHeader("Accept", "application/json")
                        .defaultCookie("id", "test"))
                .build();
    }

    private WebClient mockWebClientError() {
        final ClientResponse.Headers headers = mock(ClientResponse.Headers.class);
        when(headers.asHttpHeaders()).thenReturn(new HttpHeaders());
        
        final ClientResponse mockResponse = mock(ClientResponse.class);
        when(mockResponse.statusCode()).thenReturn(HttpStatus.INTERNAL_SERVER_ERROR);
        when(mockResponse.headers()).thenReturn(headers);
        when(mockResponse.bodyToMono(byte[].class)).thenReturn(Mono.just(new byte[0]));
        when(mockResponse.releaseBody()).thenReturn(Mono.empty());
        given(this.exchangeFunction.exchange(this.captor.capture())).willReturn(Mono.just(mockResponse));
        return WebClient.builder().baseUrl("/test")
                .exchangeFunction(this.exchangeFunction)
                .apply(consumer -> consumer.defaultHeader("Accept", "application/json")
                        .defaultCookie("id", "test"))
                .build();
    }
}
