/*
 * This file is part of ETL-Processor
 *
 * Copyright (c) 2023       Comprehensive Cancer Center Mainfranken
 * Copyright (c) 2023-2026  Paul-Christian Volkmer, Datenintegrationszentrum Philipps-Universität Marburg and Contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package dev.dnpm.etl.processor.output

import dev.dnpm.etl.processor.CustomMediaType
import dev.dnpm.etl.processor.PatientPseudonym
import dev.dnpm.etl.processor.RequestId
import dev.dnpm.etl.processor.config.AppConfigProperties
import dev.dnpm.etl.processor.config.AppConfiguration
import dev.dnpm.etl.processor.config.RestTargetProperties
import dev.dnpm.etl.processor.monitoring.ReportService
import dev.dnpm.etl.processor.monitoring.RequestStatus
import dev.pcvolkmer.mv64e.mtb.*
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Nested
import org.junit.jupiter.params.ParameterizedTest
import org.junit.jupiter.params.provider.MethodSource
import org.springframework.http.HttpHeaders
import org.springframework.http.HttpMethod
import org.springframework.http.HttpStatus
import org.springframework.retry.backoff.NoBackOffPolicy
import org.springframework.retry.policy.SimpleRetryPolicy
import org.springframework.retry.support.RetryTemplateBuilder
import org.springframework.test.web.client.ExpectedCount
import org.springframework.test.web.client.MockRestServiceServer
import org.springframework.test.web.client.match.MockRestRequestMatchers.*
import org.springframework.test.web.client.response.MockRestResponseCreators.withStatus
import org.springframework.web.client.RestTemplate
import tools.jackson.databind.json.JsonMapper
import java.time.Instant
import java.util.*

class RestDipMtbFileSenderTest {

    @Nested
    inner class DnpmV2ContentRequest {

        private lateinit var mockRestServiceServer: MockRestServiceServer

        private lateinit var restMtbFileSender: RestMtbFileSender

        private var reportService =
            ReportService(JsonMapper())

        @BeforeEach
        fun setup() {
            val restTemplate = RestTemplate()
            val restTargetProperties = RestTargetProperties("http://localhost:9000/api", null, null)
            val retryTemplate = RetryTemplateBuilder().customPolicy(SimpleRetryPolicy(1)).build()

            this.mockRestServiceServer = MockRestServiceServer.createServer(restTemplate)

            this.restMtbFileSender =
                RestDipMtbFileSender(restTemplate, restTargetProperties, retryTemplate, reportService)
        }

        @ParameterizedTest
        @MethodSource(
            "dev.dnpm.etl.processor.output.RestDipMtbFileSenderTest#mtbFileRequestWithResponseSource"
        )
        fun shouldReturnExpectedResponseForDnpmV2MtbFilePost(requestWithResponse: RequestWithResponse) {
            this.mockRestServiceServer
                .expect(method(HttpMethod.POST))
                .andExpect(requestTo("http://localhost:9000/api/mtb/etl/patient-record"))
                .andExpect(
                    header(
                        HttpHeaders.CONTENT_TYPE,
                        CustomMediaType.APPLICATION_VND_DNPM_V2_MTB_JSON_VALUE,
                    )
                )
                .andRespond {
                    withStatus(requestWithResponse.httpStatus)
                        .body(requestWithResponse.body)
                        .createResponse(it)
                }

            val response = restMtbFileSender.send(DnpmV2MtbFileRequest(TEST_REQUEST_ID, dnpmV2MtbFile()))
            assertThat(response.status).isEqualTo(requestWithResponse.response.status)
            assertThat(response.body).isEqualTo(requestWithResponse.response.body)
        }
    }

    @Nested
    inner class DeleteRequest {

        private lateinit var mockRestServiceServer: MockRestServiceServer

        private lateinit var restMtbFileSender: RestMtbFileSender

        private var reportService =
            ReportService(JsonMapper())

        @BeforeEach
        fun setup() {
            val restTemplate = RestTemplate()
            val restTargetProperties = RestTargetProperties("http://localhost:9000/api", null, null)
            val retryTemplate = RetryTemplateBuilder().customPolicy(SimpleRetryPolicy(1)).build()

            this.mockRestServiceServer = MockRestServiceServer.createServer(restTemplate)

            this.restMtbFileSender =
                RestDipMtbFileSender(restTemplate, restTargetProperties, retryTemplate, reportService)
        }

        @ParameterizedTest
        @MethodSource(
            "dev.dnpm.etl.processor.output.RestDipMtbFileSenderTest#deleteRequestWithResponseSource"
        )
        fun shouldReturnExpectedResponseForDelete(requestWithResponse: RequestWithResponse) {
            this.mockRestServiceServer
                .expect(method(HttpMethod.DELETE))
                .andExpect(
                    requestTo("http://localhost:9000/api/mtb/etl/patient/${TEST_PATIENT_PSEUDONYM.value}")
                )
                .andRespond {
                    withStatus(requestWithResponse.httpStatus)
                        .body(requestWithResponse.body)
                        .createResponse(it)
                }

            val response = restMtbFileSender.send(DeleteRequest(TEST_REQUEST_ID, TEST_PATIENT_PSEUDONYM))
            assertThat(response.status).isEqualTo(requestWithResponse.response.status)
            assertThat(response.body).isEqualTo(requestWithResponse.response.body)
        }

        @ParameterizedTest
        @MethodSource(
            "dev.dnpm.etl.processor.output.RestDipMtbFileSenderTest#deleteRequestWithResponseSource"
        )
        fun shouldRetryOnDeleteHttpRequestError(requestWithResponse: RequestWithResponse) {
            val restTemplate = RestTemplate()
            val restTargetProperties = RestTargetProperties("http://localhost:9000/api", null, null)
            val retryTemplate = AppConfiguration().retryTemplate(AppConfigProperties())
            retryTemplate.setBackOffPolicy(NoBackOffPolicy())

            this.mockRestServiceServer = MockRestServiceServer.createServer(restTemplate)
            this.restMtbFileSender =
                RestDipMtbFileSender(restTemplate, restTargetProperties, retryTemplate, reportService)

            val expectedCount =
                when (requestWithResponse.httpStatus) {
                    // OK - No Retry
                    HttpStatus.OK,
                    HttpStatus.CREATED,
                    HttpStatus.UNPROCESSABLE_ENTITY,
                    HttpStatus.BAD_REQUEST -> ExpectedCount.max(1)
                    // Request failed - Retry max 3 times
                    else -> ExpectedCount.max(3)
                }

            this.mockRestServiceServer
                .expect(expectedCount, method(HttpMethod.DELETE))
                .andExpect(
                    requestTo("http://localhost:9000/api/mtb/etl/patient/${TEST_PATIENT_PSEUDONYM.value}")
                )
                .andRespond {
                    withStatus(requestWithResponse.httpStatus)
                        .body(requestWithResponse.body)
                        .createResponse(it)
                }

            val response = restMtbFileSender.send(DeleteRequest(TEST_REQUEST_ID, TEST_PATIENT_PSEUDONYM))
            assertThat(response.status).isEqualTo(requestWithResponse.response.status)
            assertThat(response.body).isEqualTo(requestWithResponse.response.body)
        }
    }

    companion object {
        data class RequestWithResponse(
            val httpStatus: HttpStatus,
            val body: String,
            val response: MtbFileSender.Response,
        )

        val TEST_REQUEST_ID = RequestId("TestId")
        val TEST_PATIENT_PSEUDONYM = PatientPseudonym("PID")

        fun dnpmV2MtbFile(): Mtb {
            return Mtb().apply {
                this.patient =
                    Patient().apply {
                        this.id = "PID"
                        this.birthDate = Date.from(Instant.now())
                        this.gender = GenderCoding().apply { this.code = GenderCodingCode.MALE }
                    }
                this.episodesOfCare =
                    listOf(
                        MtbEpisodeOfCare().apply {
                            this.id = "1"
                            this.patient = Reference().apply { this.id = "PID" }
                            this.period = PeriodDate().apply { this.start = Date.from(Instant.now()) }
                        }
                    )
            }
        }

        private const val ERROR_RESPONSE_BODY = "Sonstiger Fehler bei der Übertragung"

        /**
         * Synthetic http responses with related request status Also see:
         * https://ibmi-intra.cs.uni-tuebingen.de/display/ZPM/bwHC+REST+API
         */
        @JvmStatic
        fun mtbFileRequestWithResponseSource(): Set<RequestWithResponse> {
            return setOf(
                RequestWithResponse(
                    HttpStatus.OK,
                    responseBodyWithMaxSeverity(ReportService.Severity.INFO),
                    MtbFileSender.Response(
                        RequestStatus.SUCCESS,
                        responseBodyWithMaxSeverity(ReportService.Severity.INFO),
                    ),
                ),
                RequestWithResponse(
                    HttpStatus.CREATED,
                    responseBodyWithMaxSeverity(ReportService.Severity.WARNING),
                    MtbFileSender.Response(
                        RequestStatus.WARNING,
                        responseBodyWithMaxSeverity(ReportService.Severity.WARNING),
                    ),
                ),
                RequestWithResponse(
                    HttpStatus.BAD_REQUEST,
                    responseBodyWithMaxSeverity(ReportService.Severity.ERROR),
                    MtbFileSender.Response(
                        RequestStatus.ERROR,
                        responseBodyWithMaxSeverity(ReportService.Severity.ERROR),
                    ),
                ),
                RequestWithResponse(
                    HttpStatus.UNPROCESSABLE_ENTITY,
                    responseBodyWithMaxSeverity(ReportService.Severity.ERROR),
                    MtbFileSender.Response(
                        RequestStatus.ERROR,
                        responseBodyWithMaxSeverity(ReportService.Severity.ERROR),
                    ),
                ),
                // Some more errors not mentioned in documentation
                RequestWithResponse(
                    HttpStatus.NOT_FOUND,
                    ERROR_RESPONSE_BODY,
                    MtbFileSender.Response(RequestStatus.ERROR, ERROR_RESPONSE_BODY),
                ),
                RequestWithResponse(
                    HttpStatus.INTERNAL_SERVER_ERROR,
                    ERROR_RESPONSE_BODY,
                    MtbFileSender.Response(RequestStatus.ERROR, ERROR_RESPONSE_BODY),
                ),
            )
        }

        /**
         * Synthetic http responses with related request status Also see:
         * https://ibmi-intra.cs.uni-tuebingen.de/display/ZPM/bwHC+REST+API
         */
        @JvmStatic
        fun deleteRequestWithResponseSource(): Set<RequestWithResponse> {
            return setOf(
                RequestWithResponse(HttpStatus.OK, "", MtbFileSender.Response(RequestStatus.SUCCESS)),
                // Some more errors not mentioned in documentation
                RequestWithResponse(
                    HttpStatus.NOT_FOUND,
                    "what????",
                    MtbFileSender.Response(RequestStatus.ERROR, ERROR_RESPONSE_BODY),
                ),
                RequestWithResponse(
                    HttpStatus.INTERNAL_SERVER_ERROR,
                    "what????",
                    MtbFileSender.Response(RequestStatus.ERROR, ERROR_RESPONSE_BODY),
                ),
            )
        }

        fun responseBodyWithMaxSeverity(severity: ReportService.Severity): String {
            return when (severity) {
                ReportService.Severity.INFO ->
                    """
                        {
                            "patient": "PID",
                            "issues": [
                                { "severity": "info", "message": "Info Message" }
                            ]
                        }
                    """

                ReportService.Severity.WARNING ->
                    """
                        {
                            "patient": "PID",
                            "issues": [
                                { "severity": "info", "message": "Info Message" },
                                { "severity": "warning", "message": "Warning Message" }
                            ]
                        }
                    """

                ReportService.Severity.ERROR ->
                    """
                        {
                            "patient": "PID",
                            "issues": [
                                { "severity": "info", "message": "Info Message" },
                                { "severity": "warning", "message": "Warning Message" },
                                { "severity": "error", "message": "Error Message" }
                            ]
                        }
                    """

                ReportService.Severity.FATAL ->
                    """
                        {
                            "patient": "PID",
                            "issues": [
                                { "severity": "info", "message": "Info Message" },
                                { "severity": "warning", "message": "Warning Message" },
                                { "severity": "error", "message": "Error Message" },
                                { "severity": "fatal", "message": "Fatal Message" }
                            ]
                        }
                    """
            }
        }
    }
}