/*-
 * ========================LICENSE_START=================================
 * O-RAN-SC
 * %%
 * Copyright (C) 2019 Nordix Foundation
 * %%
 * 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.
 * ========================LICENSE_END===================================
 */

package org.oransc.policyagent.clients;

import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.util.Arrays;

import org.json.JSONException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.junit.jupiter.MockitoExtension;
import org.oransc.policyagent.repository.Policy;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;

@ExtendWith(MockitoExtension.class)
public class StdA1ClientTest {
    private static final String RIC_URL = "RicUrl";
    private static final String POLICYTYPES_IDENTITIES_URL = "/policytypes";
    private static final String POLICIES_IDENTITIES_URL = "/policies";
    private static final String POLICYTYPES_URL = "/policytypes/";
    private static final String POLICIES_URL = "/policies/";

    private static final String POLICY_TYPE_1_NAME = "type1";
    private static final String POLICY_TYPE_2_NAME = "type2";
    private static final String POLICY_TYPE_SCHEMA_VALID = "{\"type\":\"type1\"}";
    private static final String POLICY_TYPE_SCHEMA_INVALID = "\"type\":\"type1\"}";
    private static final String POLICY_1_ID = "policy1";
    private static final String POLICY_2_ID = "policy2";
    private static final String POLICY_JSON_VALID = "{\"policyId\":\"policy1\"}";
    private static final String POLICY_JSON_INVALID = "\"policyId\":\"policy1\"}";
    private static final String POLICY_TYPE = "typeName";

    StdA1Client clientUnderTest;

    AsyncRestClient asyncRestClientMock;

    @BeforeEach
    public void init() {
        asyncRestClientMock = mock(AsyncRestClient.class);
        clientUnderTest = new StdA1Client(A1ClientHelper.createRic(RIC_URL).getConfig(), asyncRestClientMock);
    }

    @Test
    public void testGetPolicyTypeIdentities() {
        Mono<String> policyTypeIds = Mono.just(Arrays.asList(POLICY_TYPE_1_NAME, POLICY_TYPE_2_NAME).toString());
        when(asyncRestClientMock.get(POLICYTYPES_IDENTITIES_URL)).thenReturn(policyTypeIds);

        Mono<?> policyTypeIdsFlux = clientUnderTest.getPolicyTypeIdentities();
        verify(asyncRestClientMock).get(POLICYTYPES_IDENTITIES_URL);
        StepVerifier.create(policyTypeIdsFlux).expectNextCount(1).expectComplete().verify();
    }

    @Test
    public void testGetPolicyIdentities() {
        Mono<String> policyIds = Mono.just(Arrays.asList(POLICY_1_ID, POLICY_2_ID).toString());
        when(asyncRestClientMock.get(POLICIES_IDENTITIES_URL)).thenReturn(policyIds);

        Mono<?> policyIdsFlux = clientUnderTest.getPolicyIdentities();
        verify(asyncRestClientMock).get(POLICIES_IDENTITIES_URL);
        StepVerifier.create(policyIdsFlux).expectNextCount(1).expectComplete().verify();
    }

    @Test
    public void testGetValidPolicyType() {
        Mono<?> policyTypeResp =
            Mono.just("{\"policySchema\": " + POLICY_TYPE_SCHEMA_VALID + ", \"statusSchema\": {} }");

        doReturn(policyTypeResp).when(asyncRestClientMock).get(POLICYTYPES_URL + POLICY_TYPE_1_NAME);

        Mono<String> policyTypeMono = clientUnderTest.getPolicyTypeSchema(POLICY_TYPE_1_NAME);
        verify(asyncRestClientMock).get(POLICYTYPES_URL + POLICY_TYPE_1_NAME);
        StepVerifier.create(policyTypeMono).expectNext(POLICY_TYPE_SCHEMA_VALID).expectComplete().verify();
    }

    @Test
    public void testGetInvalidPolicyType() {
        when(asyncRestClientMock.get(POLICYTYPES_URL + POLICY_TYPE_1_NAME))
            .thenReturn(Mono.just(POLICY_TYPE_SCHEMA_INVALID));

        Mono<String> policyTypeMono = clientUnderTest.getPolicyTypeSchema(POLICY_TYPE_1_NAME);
        verify(asyncRestClientMock).get(POLICYTYPES_URL + POLICY_TYPE_1_NAME);
        StepVerifier.create(policyTypeMono).expectErrorMatches(throwable -> throwable instanceof JSONException)
            .verify();
    }

    @Test
    public void testPutPolicyValidResponse() {
        when(asyncRestClientMock.put(anyString(), anyString())).thenReturn(Mono.just(POLICY_JSON_VALID));

        Mono<String> policyMono = clientUnderTest
            .putPolicy(A1ClientHelper.createPolicy(RIC_URL, POLICY_1_ID, POLICY_JSON_VALID, POLICY_TYPE));
        verify(asyncRestClientMock).put(POLICIES_URL + POLICY_1_ID + "?policyTypeId=" + POLICY_TYPE, POLICY_JSON_VALID);
        StepVerifier.create(policyMono).expectNext(POLICY_JSON_VALID).expectComplete().verify();
    }

    @Test
    public void testPutPolicyInvalidResponse() {
        when(asyncRestClientMock.put(anyString(), anyString())).thenReturn(Mono.just(POLICY_JSON_INVALID));

        Mono<String> policyMono = clientUnderTest
            .putPolicy(A1ClientHelper.createPolicy(RIC_URL, POLICY_1_ID, POLICY_JSON_VALID, POLICY_TYPE));
        StepVerifier.create(policyMono).expectErrorMatches(throwable -> throwable instanceof JSONException).verify();
    }

    @Test
    public void testDeletePolicy() {
        when(asyncRestClientMock.delete(POLICIES_URL + POLICY_1_ID)).thenReturn(Mono.empty());

        Policy policy = A1ClientHelper.createPolicy(RIC_URL, POLICY_1_ID, POLICY_JSON_VALID, POLICY_TYPE);
        Mono<?> responseMono = clientUnderTest.deletePolicy(policy);
        verify(asyncRestClientMock).delete(POLICIES_URL + POLICY_1_ID);
        StepVerifier.create(responseMono).expectComplete().verify();
    }

    @Test
    public void testDeleteAllPolicies() {
        Mono<String> policyIds = Mono.just(Arrays.asList(POLICY_1_ID, POLICY_2_ID).toString());
        when(asyncRestClientMock.get(POLICIES_IDENTITIES_URL)).thenReturn(policyIds);
        when(asyncRestClientMock.delete(anyString())).thenReturn(Mono.empty());

        Flux<String> responseFlux = clientUnderTest.deleteAllPolicies();
        StepVerifier.create(responseFlux).expectComplete().verify();
        verify(asyncRestClientMock).get(POLICIES_IDENTITIES_URL);
        verify(asyncRestClientMock).delete(POLICIES_URL + POLICY_1_ID);
        verify(asyncRestClientMock).delete(POLICIES_URL + POLICY_2_ID);
    }
}