basic-banking/src/test-integration/kotlin/ltd/lulz/TransactionEndpoints.kt

package ltd.lulz

import java.math.BigDecimal
import java.util.UUID
import ltd.lulz.model.Transaction
import ltd.lulz.model.Transfer
import ltd.lulz.test.container.PostgresTestContainer
import org.assertj.core.api.SoftAssertions
import org.assertj.core.api.junit.jupiter.InjectSoftAssertions
import org.assertj.core.api.junit.jupiter.SoftAssertionsExtension
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Nested
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT
import org.springframework.boot.test.web.server.LocalServerPort
import org.springframework.http.HttpStatus.BAD_REQUEST
import org.springframework.http.HttpStatus.CREATED
import org.springframework.http.HttpStatus.NOT_ACCEPTABLE
import org.springframework.http.HttpStatus.NOT_FOUND
import org.springframework.test.web.reactive.server.WebTestClient

@PostgresTestContainer
@SpringBootTest(webEnvironment = RANDOM_PORT)
@ExtendWith(SoftAssertionsExtension::class)
class TransactionEndpoints {

    @InjectSoftAssertions
    lateinit var softly: SoftAssertions

    @LocalServerPort
    var port: Int = 0

    lateinit var webClient: WebTestClient

    @BeforeEach
    fun setup() {
        webClient = WebTestClient.bindToServer().baseUrl("http://localhost:$port").build()
    }

    @Nested
    inner class DepositTest {

        @Test
        fun `deposit - success`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/deposit")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(CREATED)
        }

        @Test
        fun `deposit - fail amount to small`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(0.009),
            )

            // when
            val result = webClient.post()
                .uri("/deposit")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(BAD_REQUEST)
        }

        @Test
        fun `deposit - fail account not found`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000000"),
                amount = BigDecimal.valueOf(0.01),
            )

            // when
            val result = webClient.post()
                .uri("/deposit")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_FOUND)
        }
    }

    @Nested
    inner class WithdrawalTest {

        @Test
        fun `deposit - success`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/withdrawal")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(CREATED)
        }

        @Test
        fun `deposit - fail amount to small`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(0.009),
            )

            // when
            val result = webClient.post()
                .uri("/withdrawal")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(BAD_REQUEST)
        }

        @Test
        fun `deposit - fail account not found`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000000"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/withdrawal")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_FOUND)
        }

        @Test
        fun `deposit - fail insufficient funds`() {
            // given
            val request = Transaction.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(100.00),
            )

            // when
            val result = webClient.post()
                .uri("/withdrawal")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_ACCEPTABLE)
        }
    }

    @Nested
    inner class TransferTest {

        @Test
        fun `deposit - success`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000002"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(CREATED)
        }

        @Test
        fun `deposit - fail same account`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(BAD_REQUEST)
        }

        @Test
        fun `deposit - fail amount to small`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000002"),
                amount = BigDecimal.valueOf(0.009),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(BAD_REQUEST)
        }

        @Test
        fun `deposit - fail account not found`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000000"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000002"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_FOUND)
        }

        @Test
        fun `deposit - fail receiver not found`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000000"),
                amount = BigDecimal.valueOf(1.00),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_FOUND)
        }

        @Test
        fun `deposit - fail insufficient funds`() {
            // given
            val request = Transfer.Request(
                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
                receiver = UUID.fromString("00000000-0000-7000-0000-000000000002"),
                amount = BigDecimal.valueOf(100.00),
            )

            // when
            val result = webClient.post()
                .uri("/transfer")
                .bodyValue(request)
                .exchange()

            // then
            result.expectStatus().isEqualTo(NOT_ACCEPTABLE)
        }
    }
}