package com.label.controller;

import com.label.annotation.RequireRole;
import com.label.common.auth.TokenPrincipal;
import com.label.common.result.PageResult;
import com.label.common.result.Result;
import com.label.dto.ExportBatchCreateRequest;
import com.label.dto.FinetuneJobResponse;
import com.label.entity.TrainingDataset;
import com.label.entity.ExportBatch;
import com.label.service.ExportService;
import com.label.service.FinetuneService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.servlet.http.HttpServletRequest;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Map;

/**
 * 训练数据导出与微调接口（5 个端点，全部 ADMIN 权限）。
 */
@Tag(name = "导出管理", description = "训练样本查询、导出批次和微调任务")
@RestController
@RequestMapping("/label")
@RequiredArgsConstructor
public class ExportController {

    private final ExportService exportService;
    private final FinetuneService finetuneService;

    /** GET /api/training/samples — 分页查询已审批可导出样本 */
    @Operation(summary = "分页查询可导出训练样本")
    @GetMapping("/api/training/samples")
    @RequireRole("ADMIN")
    public Result<PageResult<TrainingDataset>> listSamples(
            @Parameter(description = "页码，从 1 开始", example = "1")
            @RequestParam(defaultValue = "1") int page,
            @Parameter(description = "每页条数", example = "20")
            @RequestParam(defaultValue = "20") int pageSize,
            @Parameter(description = "样本类型过滤，可选值：EXTRACTION、QA_GENERATION", example = "EXTRACTION")
            @RequestParam(required = false) String sampleType,
            @Parameter(description = "是否已导出过滤", example = "false")
            @RequestParam(required = false) Boolean exported,
            HttpServletRequest request) {
        return Result.success(exportService.listSamples(page, pageSize, sampleType, exported, principal(request)));
    }

    /** POST /api/export/batch — 创建导出批次 */
    @Operation(summary = "创建导出批次")
    @PostMapping("/api/export/batch")
    @RequireRole("ADMIN")
    @ResponseStatus(HttpStatus.CREATED)
    public Result<ExportBatch> createBatch(
            @io.swagger.v3.oas.annotations.parameters.RequestBody(
                    description = "创建训练数据导出批次请求体",
                    required = true)
            @RequestBody ExportBatchCreateRequest body,
                                            HttpServletRequest request) {
        return Result.success(exportService.createBatch(body.getSampleIds(), principal(request)));
    }

    /** POST /api/export/{batchId}/finetune — 提交微调任务 */
    @Operation(summary = "提交微调任务")
    @PostMapping("/api/export/{batchId}/finetune")
    @RequireRole("ADMIN")
    public Result<FinetuneJobResponse> triggerFinetune(
            @Parameter(description = "导出批次 ID", example = "501")
            @PathVariable Long batchId,
            HttpServletRequest request) {
        return Result.success(toFinetuneJobResponse(finetuneService.trigger(batchId, principal(request))));
    }

    /** GET /api/export/{batchId}/status — 查询微调状态 */
    @Operation(summary = "查询微调状态")
    @GetMapping("/api/export/{batchId}/status")
    @RequireRole("ADMIN")
    public Result<FinetuneJobResponse> getFinetuneStatus(
            @Parameter(description = "导出批次 ID", example = "501")
            @PathVariable Long batchId,
            HttpServletRequest request) {
        return Result.success(toFinetuneJobResponse(finetuneService.getStatus(batchId, principal(request))));
    }

    /** GET /api/export/list — 分页查询导出批次列表 */
    @Operation(summary = "分页查询导出批次")
    @GetMapping("/api/export/list")
    @RequireRole("ADMIN")
    public Result<PageResult<ExportBatch>> listBatches(
            @Parameter(description = "页码，从 1 开始", example = "1")
            @RequestParam(defaultValue = "1") int page,
            @Parameter(description = "每页条数", example = "20")
            @RequestParam(defaultValue = "20") int pageSize,
            HttpServletRequest request) {
        return Result.success(exportService.listBatches(page, pageSize, principal(request)));
    }

    private FinetuneJobResponse toFinetuneJobResponse(Map<String, Object> values) {
        FinetuneJobResponse response = new FinetuneJobResponse();
        response.setBatchId(asLong(values.get("batchId")));
        response.setGlmJobId(asString(values.get("glmJobId")));
        response.setFinetuneStatus(asString(values.get("finetuneStatus")));
        response.setProgress(asInteger(values.get("progress")));
        response.setErrorMessage(asString(values.get("errorMessage")));
        return response;
    }

    private Long asLong(Object value) {
        return value == null ? null : Long.parseLong(value.toString());
    }

    private Integer asInteger(Object value) {
        return value == null ? null : Integer.parseInt(value.toString());
    }

    private String asString(Object value) {
        return value == null ? null : value.toString();
    }

    private TokenPrincipal principal(HttpServletRequest request) {
        return (TokenPrincipal) request.getAttribute("__token_principal__");
    }
}