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 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.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/


    @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("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());
                    }
                    if(resp.get("id") != null) {
                        saved.setKubeFlowId(resp.get("id").toString());
                    }
                    return saved;
                })
                .map(entity -> ResponseEntity.ok(entity))
                .doOnError(e -> log.error("Kubeflow 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();
    }
}