package com.provectus.kafka.ui;

import com.provectus.kafka.ui.model.CompatibilityLevel;
import com.provectus.kafka.ui.model.NewSchemaSubject;
import com.provectus.kafka.ui.model.SchemaSubject;
import com.provectus.kafka.ui.model.SchemaType;
import lombok.extern.log4j.Log4j2;
import lombok.val;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.web.reactive.server.EntityExchangeResult;
import org.springframework.test.web.reactive.server.WebTestClient;
import org.springframework.web.reactive.function.BodyInserters;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.UUID;

@ContextConfiguration(initializers = {AbstractBaseTest.Initializer.class})
@Log4j2
@AutoConfigureWebTestClient(timeout = "10000")
class SchemaRegistryServiceTests extends AbstractBaseTest {
    @Autowired
    WebTestClient webTestClient;
    String subject;

    @BeforeEach
    public void setUpBefore() {
        this.subject = UUID.randomUUID().toString();
    }

    @Test
    public void should404WhenGetAllSchemasForUnknownCluster() {
        webTestClient
                .get()
                .uri("/api/clusters/unknown-cluster/schemas")
                .exchange()
                .expectStatus().isNotFound();
    }

    @Test
    public void shouldReturn404WhenGetLatestSchemaByNonExistingSubject() {
        String unknownSchema = "unknown-schema";
        webTestClient
                .get()
                .uri("/api/clusters/{clusterName}/schemas/{subject}/latest", LOCAL, unknownSchema)
                .exchange()
                .expectStatus().isNotFound();
    }

    @Test
    void shouldReturn409WhenSchemaDuplicatesThePreviousVersion() {
        String schema = "{\"subject\":\"%s\",\"schemaType\":\"AVRO\",\"schema\":\"{\\\"type\\\": \\\"string\\\"}\"}";

        webTestClient
                .post()
                .uri("/api/clusters/{clusterName}/schemas", LOCAL)
                .contentType(MediaType.APPLICATION_JSON)
                .body(BodyInserters.fromValue(schema.formatted(subject)))
                .exchange()
                .expectStatus().isEqualTo(HttpStatus.OK);

        webTestClient
                .post()
                .uri("/api/clusters/{clusterName}/schemas", LOCAL)
                .contentType(MediaType.APPLICATION_JSON)
                .body(BodyInserters.fromValue(schema.formatted(subject)))
                .exchange()
                .expectStatus().isEqualTo(HttpStatus.CONFLICT);
    }

    @Test
    void shouldCreateNewProtobufSchema() {
        String schema = "syntax = \"proto3\";\n\nmessage MyRecord {\n  int32 id = 1;\n  string name = 2;\n}\n";
        NewSchemaSubject requestBody = new NewSchemaSubject()
                .schemaType(SchemaType.PROTOBUF)
                .subject(subject)
                .schema(schema);
        SchemaSubject actual = webTestClient
                .post()
                .uri("/api/clusters/{clusterName}/schemas", LOCAL)
                .contentType(MediaType.APPLICATION_JSON)
                .body(BodyInserters.fromPublisher(Mono.just(requestBody), NewSchemaSubject.class))
                .exchange()
                .expectStatus()
                .isOk()
                .expectBody(SchemaSubject.class)
                .returnResult()
                .getResponseBody();

        Assertions.assertNotNull(actual);
        Assertions.assertEquals(CompatibilityLevel.CompatibilityEnum.BACKWARD.name(), actual.getCompatibilityLevel());
        Assertions.assertEquals("1", actual.getVersion());
        Assertions.assertEquals(SchemaType.PROTOBUF, actual.getSchemaType());
        Assertions.assertEquals(schema, actual.getSchema());
    }

    @Test
    public void shouldReturnBackwardAsGlobalCompatibilityLevelByDefault() {
        webTestClient
                .get()
                .uri("/api/clusters/{clusterName}/schemas/compatibility", LOCAL)
                .exchange()
                .expectStatus().isOk()
                .expectBody(CompatibilityLevel.class)
                .consumeWith(result -> {
                    CompatibilityLevel responseBody = result.getResponseBody();
                    Assertions.assertNotNull(responseBody);
                    Assertions.assertEquals(CompatibilityLevel.CompatibilityEnum.BACKWARD, responseBody.getCompatibility());
                });
    }

    @Test
    public void shouldReturnNotEmptyResponseWhenGetAllSchemas() {
        createNewSubjectAndAssert(subject);

        webTestClient
                .get()
                .uri("/api/clusters/{clusterName}/schemas", LOCAL)
                .exchange()
                .expectStatus().isOk()
                .expectBodyList(SchemaSubject.class)
                .consumeWith(result -> {
                    List<SchemaSubject> responseBody = result.getResponseBody();
                    log.info("Response of test schemas: {}", responseBody);
                    Assertions.assertNotNull(responseBody);
                    Assertions.assertFalse(responseBody.isEmpty());

                    SchemaSubject actualSchemaSubject = responseBody.stream()
                            .filter(schemaSubject -> subject.equals(schemaSubject.getSubject()))
                            .findFirst()
                            .orElseThrow();
                    Assertions.assertNotNull(actualSchemaSubject.getId());
                    Assertions.assertNotNull(actualSchemaSubject.getVersion());
                    Assertions.assertNotNull(actualSchemaSubject.getCompatibilityLevel());
                    Assertions.assertEquals("\"string\"", actualSchemaSubject.getSchema());
                });
    }

    @Test
    public void shouldOkWhenCreateNewSchemaThenGetAndUpdateItsCompatibilityLevel() {
        createNewSubjectAndAssert(subject);

        //Get the created schema and check its items
        webTestClient
                .get()
                .uri("/api/clusters/{clusterName}/schemas/{subject}/latest", LOCAL, subject)
                .exchange()
                .expectStatus().isOk()
                .expectBodyList(SchemaSubject.class)
                .consumeWith(listEntityExchangeResult -> {
                    val expectedCompatibility = CompatibilityLevel.CompatibilityEnum.BACKWARD;
                    assertSchemaWhenGetLatest(subject, listEntityExchangeResult, expectedCompatibility);
                });

        //Now let's change compatibility level of this schema to FULL whereas the global level should be BACKWARD
        webTestClient.put()
                .uri("/api/clusters/{clusterName}/schemas/{subject}/compatibility", LOCAL, subject)
                .contentType(MediaType.APPLICATION_JSON)
                .body(BodyInserters.fromValue("{\"compatibility\":\"FULL\"}"))
                .exchange()
                .expectStatus().isOk();

        //Get one more time to check the schema compatibility level is changed to FULL
        webTestClient
                .get()
                .uri("/api/clusters/{clusterName}/schemas/{subject}/latest", LOCAL, subject)
                .exchange()
                .expectStatus().isOk()
                .expectBodyList(SchemaSubject.class)
                .consumeWith(listEntityExchangeResult -> {
                    val expectedCompatibility = CompatibilityLevel.CompatibilityEnum.FULL;
                    assertSchemaWhenGetLatest(subject, listEntityExchangeResult, expectedCompatibility);
                });
    }

    private void createNewSubjectAndAssert(String subject) {
        webTestClient
                .post()
                .uri("/api/clusters/{clusterName}/schemas", LOCAL)
                .contentType(MediaType.APPLICATION_JSON)
                .body(BodyInserters.fromValue("{\"subject\":\"%s\",\"schemaType\":\"AVRO\",\"schema\":\"{\\\"type\\\": \\\"string\\\"}\"}".formatted(subject)))
                .exchange()
                .expectStatus().isOk()
                .expectBody(SchemaSubject.class)
                .consumeWith(this::assertResponseBodyWhenCreateNewSchema);
    }

    private void assertSchemaWhenGetLatest(String subject, EntityExchangeResult<List<SchemaSubject>> listEntityExchangeResult, CompatibilityLevel.CompatibilityEnum expectedCompatibility) {
        List<SchemaSubject> responseBody = listEntityExchangeResult.getResponseBody();
        Assertions.assertNotNull(responseBody);
        Assertions.assertEquals(1, responseBody.size());
        SchemaSubject actualSchema = responseBody.get(0);
        Assertions.assertNotNull(actualSchema);
        Assertions.assertEquals(subject, actualSchema.getSubject());
        Assertions.assertEquals("\"string\"", actualSchema.getSchema());

        Assertions.assertNotNull(actualSchema.getCompatibilityLevel());
        Assertions.assertEquals(SchemaType.AVRO, actualSchema.getSchemaType());
        Assertions.assertEquals(expectedCompatibility.name(), actualSchema.getCompatibilityLevel());
    }

    private void assertResponseBodyWhenCreateNewSchema(EntityExchangeResult<SchemaSubject> exchangeResult) {
        SchemaSubject responseBody = exchangeResult.getResponseBody();
        Assertions.assertNotNull(responseBody);
        Assertions.assertEquals("1", responseBody.getVersion());
        Assertions.assertNotNull(responseBody.getSchema());
        Assertions.assertNotNull(responseBody.getSubject());
        Assertions.assertNotNull(responseBody.getCompatibilityLevel());
        Assertions.assertEquals(SchemaType.AVRO, responseBody.getSchemaType());
    }
}