package com.kamco.cd.training.model;

import com.kamco.cd.training.config.api.ApiResponseDto;
import com.kamco.cd.training.model.dto.ModelMngDto;
import com.kamco.cd.training.model.dto.ModelMngDto.Basic;
import com.kamco.cd.training.model.service.ModelMngService;
import com.kamco.cd.training.model.service.ModelTrainService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.validation.Valid;
import java.util.List;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequiredArgsConstructor
@Tag(name = "모델관리", description = "어드민 홈 > 모델학습관리 > 모델관리 > 목록")
@RequestMapping("/api/models")
public class ModelMngApiController {
  private final ModelMngService modelMngService;
  private final ModelTrainService modelTrainService;

  @Operation(summary = "학습 모델 목록 조회", description = "학습 모델 목록을 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "검색 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = Page.class))),
        @ApiResponse(responseCode = "400", description = "잘못된 검색 조건", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping
  public ApiResponseDto<Page<Basic>> findByModels(
      @Parameter(description = "상태 코드") @RequestParam(required = false) String status,
      @Parameter(description = "페이지 번호") @RequestParam(defaultValue = "0") int page,
      @Parameter(description = "페이지 크기") @RequestParam(defaultValue = "20") int size) {
    ModelMngDto.SearchReq searchReq = new ModelMngDto.SearchReq(status, page, size);
    return ApiResponseDto.ok(modelMngService.findByModels(searchReq));
  }

  @Operation(summary = "학습 모델 상세 조회", description = "학습 모델의 상세 정보를 UUID로 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.Detail.class))),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/{uuid}")
  public ApiResponseDto<ModelMngDto.Detail> getModelDetail(
      @Parameter(description = "모델 UUID", example = "b7e99739-6736-45f9-a224-8161ecddf287")
          @PathVariable
          String uuid) {
    return ApiResponseDto.ok(modelMngService.getModelDetailByUuid(uuid));
  }

  // ==================== 학습 모델학습관리 API (5종) ====================

  @Operation(summary = "학습 모델 통합 조회", description = "학습 관리 화면에서 학습 이력 리스트와 현재 상태를 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = List.class))),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/train")
  public ApiResponseDto<List<ModelMngDto.TrainListRes>> getTrainModelList() {
    return ApiResponseDto.ok(modelTrainService.getTrainModelList());
  }

  @Operation(summary = "학습 설정 통합 조회", description = "학습 실행 팝업 구성에 필요한 모든 데이터를 한 번에 반환합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.FormConfigRes.class))),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/train/form-config")
  public ApiResponseDto<ModelMngDto.FormConfigRes> getFormConfig() {
    return ApiResponseDto.ok(modelTrainService.getFormConfig());
  }

  @Operation(summary = "하이퍼파라미터 등록", description = "Step 1 에서 파라미터를 수정하여 신규 버전으로 저장합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "등록 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = String.class))),
        @ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @PostMapping("/hyper-params")
  public ApiResponseDto<String> createHyperParam(
      @Valid @RequestBody ModelMngDto.HyperParamCreateReq createReq) {
    String newVersion = modelTrainService.createHyperParam(createReq);
    return ApiResponseDto.ok(newVersion);
  }

  @Operation(summary = "하이퍼파라미터 단건 조회", description = "특정 버전의 하이퍼파라미터 상세 정보를 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.HyperParamInfo.class))),
        @ApiResponse(responseCode = "404", description = "하이퍼파라미터를 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/hyper-params/{hyperVer}")
  public ApiResponseDto<ModelMngDto.HyperParamInfo> getHyperParam(
      @Parameter(description = "하이퍼파라미터 버전", example = "H1") @PathVariable String hyperVer) {
    return ApiResponseDto.ok(modelTrainService.getHyperParam(hyperVer));
  }

  @Operation(summary = "하이퍼파라미터 삭제", description = "특정 버전의 하이퍼파라미터를 삭제합니다 (H1은 삭제 불가)")
  @ApiResponses(
      value = {
        @ApiResponse(responseCode = "200", description = "삭제 성공", content = @Content),
        @ApiResponse(responseCode = "400", description = "H1은 삭제 불가", content = @Content),
        @ApiResponse(responseCode = "404", description = "하이퍼파라미터를 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @DeleteMapping("/hyper-params/{hyperVer}")
  public ApiResponseDto<Void> deleteHyperParam(
      @Parameter(description = "하이퍼파라미터 버전", example = "V3.99.251221.120518") @PathVariable
          String hyperVer) {
    modelTrainService.deleteHyperParam(hyperVer);
    return ApiResponseDto.ok(null);
  }

  @Operation(summary = "학습 시작", description = "모든 설정(Step 1~3)을 마치고 최종적으로 학습 프로세스를 시작합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "학습 시작 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.TrainStartRes.class))),
        @ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @PostMapping("/train")
  public ApiResponseDto<ModelMngDto.TrainStartRes> startTraining(
      @Valid @RequestBody ModelMngDto.TrainStartReq trainReq) {
    return ApiResponseDto.ok(modelTrainService.startTraining(trainReq));
  }

  @Operation(summary = "학습 모델 삭제", description = "목록에서 특정 학습 모델을 삭제합니다")
  @ApiResponses(
      value = {
        @ApiResponse(responseCode = "200", description = "삭제 성공", content = @Content),
        @ApiResponse(responseCode = "400", description = "진행 중인 모델은 삭제 불가", content = @Content),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @DeleteMapping("/train/{uuid}")
  public ApiResponseDto<Void> deleteTrainModel(
      @Parameter(description = "모델 UUID") @PathVariable String uuid) {
    modelTrainService.deleteTrainModel(uuid);
    return ApiResponseDto.ok(null);
  }

  // ==================== Resume Training (학습 재시작) ====================

  @Operation(summary = "학습 재시작 정보 조회", description = "중단된 학습의 재시작 가능 여부와 Checkpoint 정보를 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.ResumeInfo.class))),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/train/{uuid}/resume-info")
  public ApiResponseDto<ModelMngDto.ResumeInfo> getResumeInfo(
      @Parameter(description = "모델 UUID") @PathVariable String uuid) {
    return ApiResponseDto.ok(modelTrainService.getResumeInfo(uuid));
  }

  @Operation(summary = "학습 재시작", description = "중단된 지점(Checkpoint)부터 학습을 재개합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "재시작 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.ResumeResponse.class))),
        @ApiResponse(responseCode = "400", description = "재시작 불가능한 상태", content = @Content),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @PostMapping("/train/{uuid}/resume")
  public ApiResponseDto<ModelMngDto.ResumeResponse> resumeTraining(
      @Parameter(description = "모델 UUID") @PathVariable String uuid,
      @Valid @RequestBody ModelMngDto.ResumeRequest resumeReq) {
    return ApiResponseDto.ok(modelTrainService.resumeTraining(uuid, resumeReq));
  }

  // ==================== Best Epoch Setting (Best Epoch 설정) ====================

  @Operation(summary = "Best Epoch 설정", description = "사용자가 직접 Best Epoch를 선택하여 설정합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "설정 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = ModelMngDto.BestEpochResponse.class))),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @PostMapping("/train/{uuid}/best-epoch")
  public ApiResponseDto<ModelMngDto.BestEpochResponse> setBestEpoch(
      @Parameter(description = "모델 UUID") @PathVariable String uuid,
      @Valid @RequestBody ModelMngDto.BestEpochRequest bestEpochReq) {
    return ApiResponseDto.ok(modelTrainService.setBestEpoch(uuid, bestEpochReq));
  }

  @Operation(summary = "Epoch별 성능 지표 조회", description = "학습된 모델의 Epoch별 성능 지표를 조회합니다")
  @ApiResponses(
      value = {
        @ApiResponse(
            responseCode = "200",
            description = "조회 성공",
            content =
                @Content(
                    mediaType = "application/json",
                    schema = @Schema(implementation = List.class))),
        @ApiResponse(responseCode = "404", description = "모델을 찾을 수 없음", content = @Content),
        @ApiResponse(responseCode = "500", description = "서버 오류", content = @Content)
      })
  @GetMapping("/train/{uuid}/epoch-metrics")
  public ApiResponseDto<List<ModelMngDto.EpochMetric>> getEpochMetrics(
      @Parameter(description = "모델 UUID") @PathVariable String uuid) {
    return ApiResponseDto.ok(modelTrainService.getEpochMetrics(uuid));
  }
}