package kr.re.etri.autoflow.controllers;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.transaction.Transactional;
import kr.re.etri.autoflow.entity.ExperimentsEntity;
import kr.re.etri.autoflow.payload.request.ProjectBaseSearchRequest;
import kr.re.etri.autoflow.service.ExperimentsService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springdoc.core.annotations.ParameterObject;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.domain.Page;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Tag(name = "Experiments", description = "Kubeflow 및 MLflow Experiment API")
@RestController
@RequestMapping("/api/experiments")
@RequiredArgsConstructor
@Slf4j
public class ExperimentsController {

    private final ExperimentsService experimentsService;

    private final WebClient.Builder webClientBuilder;

    @Value("${kubeflow.url}")
    private String kubeflowBaseUrl; // 예: http://192.168.10.135:32473/

    @Value("${mlflow.url}")
    private String mlflowBaseUrl; // 예: http://192.168.10.135:32473/


    @Value("${mlflow.user}")
    private String mlflowUser; // 예: http://192.168.10.135:32473/

    @Value("${mlflow.password}")
    private String mlflowPassword; // 예: http://192.168.10.135:32473/

    @Operation(summary = "모든 Experiments 조회")
    @GetMapping
    public ResponseEntity<List<ExperimentsEntity>> getAllExperiments() {
        return ResponseEntity.ok(experimentsService.findAll());
    }

    @Operation(summary = "Experiment 단건 조회")
    @GetMapping("/{id}")
    public ResponseEntity<ExperimentsEntity> getExperiment(
            @Parameter(description = "Experiment ID", example = "1") @PathVariable("id") Long id) {

        return experimentsService.findById(id)
                .map(ResponseEntity::ok)
                .orElse(ResponseEntity.notFound().build());
    }

    @Operation(summary = "Experiment 검색 및 페이지네이션")
    @GetMapping("/search")
    public ResponseEntity<Page<ExperimentsEntity>> searchExperiments(
            @ParameterObject @ModelAttribute ProjectBaseSearchRequest request) {
        Page<ExperimentsEntity> page = experimentsService.search(request);
        return ResponseEntity.ok(page);
    }

//    @Operation(summary = "Experiment 등록")
//    @PostMapping
//    public Mono<ResponseEntity<ExperimentsEntity>> createExperiment(@RequestBody ExperimentsEntity experiment) {
//
//        // 1️⃣ DB 저장
//        ExperimentsEntity saved = experimentsService.save(experiment);
//
//        // 2️⃣ Kubeflow POST 요청 payload
//        Map<String, Object> payload = new HashMap<>();
//        payload.put("display_name", saved.getDisplayName());
//        payload.put("description", saved.getDescription());
//        payload.put("namespace", "default"); // 필요에 따라 변경
//
//        // 3️⃣ WebClient POST
//        return webClientBuilder.build()
//                .post()
//                .uri(kubeflowBaseUrl + "/apis/v2beta1/experiments")
//                .contentType(MediaType.APPLICATION_JSON)
//                .bodyValue(payload)
//                .retrieve()
//                .bodyToMono(Map.class) // Kubeflow 응답
//                .map(resp -> {
//                    // resp에서 필요한 값 추출 후 entity에 반영
//                    if(resp.get("id") != null) {
//                        saved.setKubeFlowId(resp.get("id").toString());
//                    }
//
//                    if (resp.get("storage_state") != null) {
//                        saved.setKubeflowStorageState(resp.get("storage_state").toString());
//                    }
//
//                    if (resp.get("created_at") != null) {
//                        String lastRunStr = resp.get("created_at").toString();
//                        OffsetDateTime odt = OffsetDateTime.parse(lastRunStr);
//                        saved.setKubeflowCreatedAt(odt.withOffsetSameInstant(ZoneId.of("Asia/Seoul").getRules().getOffset(odt.toInstant()))
//                                .toLocalDateTime());
//                    }
//
//                    if (resp.get("last_run_created_at") != null) {
//                        String lastRunStr = resp.get("last_run_created_at").toString();
//                        OffsetDateTime odt = OffsetDateTime.parse(lastRunStr);
//                        saved.setKubeflowLastRunCreatedAt(odt.withOffsetSameInstant(ZoneId.of("Asia/Seoul").getRules().getOffset(odt.toInstant()))
//                                .toLocalDateTime());
//                    }
//                    return saved;
//                })
//                .map(ResponseEntity::ok)
//                .doOnError(e -> log.error("Kubeflow experiment 등록 실패", e));
//    }

    @Operation(summary = "Experiment 등록 (Kubeflow + MLflow)")
    @PostMapping
    @Transactional
    public Mono<ResponseEntity<ExperimentsEntity>> createExperiment(@RequestBody ExperimentsEntity experiment) {

        ExperimentsEntity saved = experimentsService.save(experiment);

        Map<String, Object> kubeflowPayload = new HashMap<>();
        kubeflowPayload.put("display_name", saved.getDisplayName());
        kubeflowPayload.put("description", saved.getDescription());
        kubeflowPayload.put("namespace", "default");

        return webClientBuilder.build()
                // 1️⃣ Kubeflow 등록
                .post()
                .uri(kubeflowBaseUrl + "/apis/v2beta1/experiments")
                .contentType(MediaType.APPLICATION_JSON)
                .bodyValue(kubeflowPayload)
                .retrieve()
                .bodyToMono(Map.class)
                .flatMap(kubeflowResp -> {
                    // Kubeflow 응답 처리
                    if (kubeflowResp.containsKey("experiment_id")) {
                        saved.setKubeFlowId((String) kubeflowResp.get("experiment_id"));
                    }
                    if (kubeflowResp.containsKey("created_at")) {
                        saved.setKubeflowCreatedAt(
                                Instant.parse((String) kubeflowResp.get("created_at"))
                                        .atZone(ZoneId.of("Asia/Seoul"))
                                        .toLocalDateTime()
                        );
                    }
                    if (kubeflowResp.containsKey("last_run_created_at")) {
                        saved.setKubeflowLastRunCreatedAt(
                                Instant.parse((String) kubeflowResp.get("last_run_created_at"))
                                        .atZone(ZoneId.of("Asia/Seoul"))
                                        .toLocalDateTime()
                        );
                    }
                    if (kubeflowResp.containsKey("storage_state")) {
                        saved.setKubeflowStorageState((String) kubeflowResp.get("storage_state"));
                    }

                    experimentsService.save(saved);
                    log.info("Kubeflow experiment 등록 완료: {}", kubeflowResp);

                    // 2️⃣ MLflow 등록
                    Map<String, Object> mlflowPayload = new HashMap<>();
                    mlflowPayload.put("name", saved.getDisplayName());
                    mlflowPayload.put("artifact_location", "/default/artifacts");

                    return webClientBuilder.build()
                            .post()
                            .uri(mlflowBaseUrl + "/ajax-api/2.0/mlflow/experiments/create")
                            .headers(headers -> headers.setBasicAuth(mlflowUser, mlflowPassword))
                            .contentType(MediaType.APPLICATION_JSON)
                            .bodyValue(mlflowPayload)
                            .retrieve()
                            .bodyToMono(Map.class)
                            .flatMap(createResp -> {
                                log.info("MLflow experiment 등록 완료: {}", createResp);
                                String mlflowExpId = (String) createResp.get("experiment_id");

                                // 3️⃣ MLflow 조회
                                return webClientBuilder
                                        .build()
                                        .get()
                                        .uri(mlflowBaseUrl + "/ajax-api/2.0/mlflow/experiments/get?experiment_id=" + mlflowExpId)
                                        .headers(headers -> headers.setBasicAuth(mlflowUser, mlflowPassword))
                                        .retrieve()
                                        .bodyToMono(Map.class)
                                        .flatMap(getResp -> {
                                            log.info("MLflow experiment 상세 조회 완료: {}", getResp);
                                            // 필요한 필드를 entity에 반영
                                            if (getResp.containsKey("experiment")) {
                                                Map<String, Object> exp = (Map<String, Object>) getResp.get("experiment");

                                                // MLflow 응답 필드 반영
                                                if (exp.containsKey("experiment_id")) {
                                                    saved.setMlFlowId((String) exp.get("experiment_id"));
                                                }

                                                if (exp.containsKey("artifact_location")) {
                                                    saved.setMlflow_artifactLocation((String) exp.get("artifact_location"));
                                                }
                                                if (exp.containsKey("lifecycle_stage")) {
                                                    saved.setMlflowLifecycleStage((String) exp.get("lifecycle_stage"));
                                                }
                                                if (exp.containsKey("created_at")) {
                                                    // created_at은 timestamp(ms)로 올 수도 있으므로 Instant 변환
                                                    Object createdAtObj = exp.get("created_at");
                                                    Instant createdAtInstant = null;
                                                    if (createdAtObj instanceof Number) {
                                                        createdAtInstant = Instant.ofEpochMilli(((Number) createdAtObj).longValue());
                                                    } else if (createdAtObj instanceof String) {
                                                        createdAtInstant = Instant.parse((String) createdAtObj);
                                                    }
                                                    if (createdAtInstant != null) {
                                                        saved.setMlflowCreatedAt(
                                                                createdAtInstant.atZone(ZoneId.of("Asia/Seoul")).toLocalDateTime()
                                                        );
                                                    }
                                                }
                                            }
                                            experimentsService.save(saved);
                                            return Mono.just(ResponseEntity.ok(saved));
                                        });
                            });
                })
                .doOnError(e -> log.error("Experiment 등록 실패", e));
    }


    @Operation(summary = "Experiment 수정")
    @PutMapping("/{id}")
    public ResponseEntity<ExperimentsEntity> updateExperiment(
            @Parameter(description = "Experiment ID", example = "1") @PathVariable("id") Long id,
            @RequestBody ExperimentsEntity experiment) {

        return experimentsService.findById(id)
                .map(existing -> {
                    experiment.setId(id);
                    return ResponseEntity.ok(experimentsService.save(experiment));
                })
                .orElse(ResponseEntity.notFound().build());
    }

    @Operation(summary = "Experiment 삭제")
    @DeleteMapping("/{id}")
    public ResponseEntity<Void> deleteExperiment(
            @Parameter(description = "Experiment ID", example = "1") @PathVariable("id") Long id) {

        if (experimentsService.deleteById(id)) {
            return ResponseEntity.noContent().build();
        }
        return ResponseEntity.notFound().build();
    }
}