/**
 * 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.fineract.integrationtests;

import io.restassured.builder.RequestSpecBuilder;
import io.restassured.builder.ResponseSpecBuilder;
import io.restassured.http.ContentType;
import io.restassured.specification.RequestSpecification;
import io.restassured.specification.ResponseSpecification;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.UUID;
import org.apache.fineract.batch.domain.BatchRequest;
import org.apache.fineract.batch.domain.BatchResponse;
import org.apache.fineract.batch.domain.Header;
import org.apache.fineract.infrastructure.core.exception.AbstractIdempotentCommandException;
import org.apache.fineract.integrationtests.common.BatchHelper;
import org.apache.fineract.integrationtests.common.ClientHelper;
import org.apache.fineract.integrationtests.common.CollateralManagementHelper;
import org.apache.fineract.integrationtests.common.GroupHelper;
import org.apache.fineract.integrationtests.common.Utils;
import org.apache.fineract.integrationtests.common.loans.LoanProductTestBuilder;
import org.apache.fineract.integrationtests.common.loans.LoanTransactionHelper;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Test class for testing the integration of Batch API with custom batch requests and various user defined workflow.
 * Like in the case of mifos community-app
 *
 * @author Rishabh Shukla
 */
public class BatchRequestsIntegrationTest {

    private static final Logger LOG = LoggerFactory.getLogger(BatchRequestsIntegrationTest.class);
    private ResponseSpecification responseSpec;
    private RequestSpecification requestSpec;
    private static final SecureRandom secureRandom = new SecureRandom();

    public BatchRequestsIntegrationTest() {

    }

    /**
     * Sets up the essential settings for the TEST like contentType, expectedStatusCode. It uses the '@BeforeEach'
     * annotation provided by jUnit.
     */
    @BeforeEach
    public void setup() {

        Utils.initializeRESTAssured();
        this.requestSpec = new RequestSpecBuilder().setContentType(ContentType.JSON).build();
        this.requestSpec.header("Authorization", "Basic " + Utils.loginIntoServerAndGetBase64EncodedAuthenticationKey());
        this.responseSpec = new ResponseSpecBuilder().expectStatusCode(200).build();
    }

    @Test
    /**
     * Tests that a loan is successfully applied to client members of a group. Firstly, it'll create a few new clients
     * and then will add those clients to the group. Then a few loans will be created and one of those loans will be
     * chosen at random and similarily a few of the created clients will be chosen on random. Now, the selected loan
     * will be applied to these clients through Batch - API ApplyLoanCommandStrategy.
     */
    public void shouldReturnOkStatusForLoansAppliedToSelectedClients() {

        // Generate a random count of number of clients to be created
        final Integer clientsCount = (int) Math.ceil(secureRandom.nextDouble() * 7) + 3;
        final Integer[] clientIDs = new Integer[clientsCount];

        // Create a new group and get its groupId
        Integer groupID = GroupHelper.createGroup(this.requestSpec, this.responseSpec, true);

        // Create new clients and add those to this group
        for (Integer i = 0; i < clientsCount; i++) {
            clientIDs[i] = ClientHelper.createClient(this.requestSpec, this.responseSpec);
            groupID = GroupHelper.associateClient(this.requestSpec, this.responseSpec, groupID.toString(), clientIDs[i].toString());
            LOG.info("client {} has been added to the group {}", clientIDs[i], groupID);
        }

        // Generate a random count of number of new loan products to be created
        final Integer loansCount = (int) Math.ceil(secureRandom.nextDouble() * 4) + 1;
        final Integer[] loanProducts = new Integer[loansCount];

        // Create new loan Products
        for (Integer i = 0; i < loansCount; i++) {
            final String loanProductJSON = new LoanProductTestBuilder() //
                    .withPrincipal(String.valueOf(10000.00 + Math.ceil(secureRandom.nextDouble() * 1000000.00))) //
                    .withNumberOfRepayments(String.valueOf(2 + (int) Math.ceil(secureRandom.nextDouble() * 36))) //
                    .withRepaymentAfterEvery(String.valueOf(1 + (int) Math.ceil(secureRandom.nextDouble() * 3))) //
                    .withRepaymentTypeAsMonth() //
                    .withinterestRatePerPeriod(String.valueOf(1 + (int) Math.ceil(secureRandom.nextDouble() * 4))) //
                    .withInterestRateFrequencyTypeAsMonths() //
                    .withAmortizationTypeAsEqualPrincipalPayment() //
                    .withInterestTypeAsDecliningBalance() //
                    .currencyDetails("0", "100").build(null);

            loanProducts[i] = new LoanTransactionHelper(this.requestSpec, this.responseSpec).getLoanProductId(loanProductJSON);
        }

        // Select anyone of the loan products at random
        final Integer loanProductID = loanProducts[(int) Math.floor(secureRandom.nextDouble() * (loansCount - 1))];

        final List<BatchRequest> batchRequests = new ArrayList<>();

        // Select a few clients from created group at random
        Integer selClientsCount = (int) Math.ceil(secureRandom.nextDouble() * clientsCount) + 2;
        for (int i = 0; i < selClientsCount; i++) {

            final Integer collateralId = CollateralManagementHelper.createCollateralProduct(this.requestSpec, this.responseSpec);
            Assertions.assertNotNull(collateralId);
            final Integer clientCollateralId = CollateralManagementHelper.createClientCollateral(this.requestSpec, this.responseSpec,
                    String.valueOf(clientIDs[(int) Math.floor(secureRandom.nextDouble() * (clientsCount - 1))]), collateralId);
            Assertions.assertNotNull(clientCollateralId);

            BatchRequest br = BatchHelper.applyLoanRequest((long) selClientsCount, null, loanProductID, clientCollateralId);
            br.setBody(br.getBody().replace("$.clientId",
                    String.valueOf(clientIDs[(int) Math.floor(secureRandom.nextDouble() * (clientsCount - 1))])));
            batchRequests.add(br);
        }

        // Send the request to Batch - API
        final String jsonifiedRequest = BatchHelper.toJsonString(batchRequests);

        final List<BatchResponse> response = BatchHelper.postBatchRequestsWithoutEnclosingTransaction(this.requestSpec, this.responseSpec,
                jsonifiedRequest);

        // Verify that each loan has been applied successfully
        for (BatchResponse res : response) {
            Assertions.assertEquals(200L, (long) res.getStatusCode(), "Verify Status Code 200");
        }
    }

    @Test
    public void shouldReturnOkStatusWithIdempotencySupport() {

        // Generate a random count of number of clients to be created
        final Integer clientsCount = (int) Math.ceil(secureRandom.nextDouble() * 7) + 3;
        final Integer[] clientIDs = new Integer[clientsCount];

        // Create a new group and get its groupId
        Integer groupID = GroupHelper.createGroup(this.requestSpec, this.responseSpec, true);

        // Create new clients and add those to this group
        for (Integer i = 0; i < clientsCount; i++) {
            clientIDs[i] = ClientHelper.createClient(this.requestSpec, this.responseSpec);
            groupID = GroupHelper.associateClient(this.requestSpec, this.responseSpec, groupID.toString(), clientIDs[i].toString());
            LOG.info("client {} has been added to the group {}", clientIDs[i], groupID);
        }

        // Generate a random count of number of new loan products to be created
        final Integer loansCount = (int) Math.ceil(secureRandom.nextDouble() * 4) + 1;
        final Integer[] loanProducts = new Integer[loansCount];

        // Create new loan Products
        LoanTransactionHelper helper = new LoanTransactionHelper(this.requestSpec, this.responseSpec);
        for (Integer i = 0; i < loansCount; i++) {
            final String loanProductJSON = new LoanProductTestBuilder() //
                    .withPrincipal(String.valueOf(10000.00 + Math.ceil(secureRandom.nextDouble() * 1000000.00))) //
                    .withNumberOfRepayments(String.valueOf(2 + (int) Math.ceil(secureRandom.nextDouble() * 36))) //
                    .withRepaymentAfterEvery(String.valueOf(1 + (int) Math.ceil(secureRandom.nextDouble() * 3))) //
                    .withRepaymentTypeAsMonth() //
                    .withinterestRatePerPeriod(String.valueOf(1 + (int) Math.ceil(secureRandom.nextDouble() * 4))) //
                    .withInterestRateFrequencyTypeAsMonths() //
                    .withAmortizationTypeAsEqualPrincipalPayment() //
                    .withInterestTypeAsDecliningBalance() //
                    .currencyDetails("0", "100").build(null);

            loanProducts[i] = helper.getLoanProductId(loanProductJSON);
        }

        // Select anyone of the loan products at random
        final Integer loanProductID = loanProducts[(int) Math.floor(secureRandom.nextDouble() * (loansCount - 1))];

        final List<BatchRequest> batchRequests = new ArrayList<>();

        // Select a few clients from created group at random
        Integer selClientsCount = (int) Math.ceil(secureRandom.nextDouble() * clientsCount) + 2;
        for (int i = 0; i < selClientsCount; i++) {

            final Integer collateralId = CollateralManagementHelper.createCollateralProduct(this.requestSpec, this.responseSpec);
            Assertions.assertNotNull(collateralId);
            final Integer clientCollateralId = CollateralManagementHelper.createClientCollateral(this.requestSpec, this.responseSpec,
                    String.valueOf(clientIDs[(int) Math.floor(secureRandom.nextDouble() * (clientsCount - 1))]), collateralId);
            Assertions.assertNotNull(clientCollateralId);

            BatchRequest br = BatchHelper.applyLoanRequest((long) selClientsCount, null, loanProductID, clientCollateralId);
            br.setBody(br.getBody().replace("$.clientId",
                    String.valueOf(clientIDs[(int) Math.floor(secureRandom.nextDouble() * (clientsCount - 1))])));
            br.setHeaders(new HashSet<>());
            br.getHeaders().add(new Header("Idempotency-Key", UUID.randomUUID().toString()));
            batchRequests.add(br);
        }

        // Send the request to Batch - API
        final String jsonifiedRequest = BatchHelper.toJsonString(batchRequests);

        final List<BatchResponse> response = BatchHelper.postBatchRequestsWithoutEnclosingTransaction(this.requestSpec, this.responseSpec,
                jsonifiedRequest);

        // Verify that each loan has been applied successfully
        for (BatchResponse res : response) {
            Assertions.assertFalse(
                    res.getHeaders().stream()
                            .anyMatch(header -> header.getName().equals(AbstractIdempotentCommandException.IDEMPOTENT_CACHE_HEADER)),
                    "First can not be cached!");
            Assertions.assertEquals(200L, (long) res.getStatusCode(), "Verify Status Code 200");
        }

        final List<BatchResponse> secondResponse = BatchHelper.postBatchRequestsWithoutEnclosingTransaction(this.requestSpec,
                this.responseSpec, jsonifiedRequest);

        // Verify that each loan has been applied successfully
        for (BatchResponse res : secondResponse) {
            Assertions.assertEquals("true",
                    res.getHeaders().stream()
                            .filter(header -> header.getName().equals(AbstractIdempotentCommandException.IDEMPOTENT_CACHE_HEADER))
                            .map(Header::getValue).findAny().get(),
                    "Not cached by idempotency key!");
            Assertions.assertEquals(200L, (long) res.getStatusCode(), "Verify Status Code 200");
        }
    }
}