package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.LabDeviation;
import com.kaidi.oa.domain.TestTask;
import com.kaidi.oa.repository.LabDeviationRepository;
import com.kaidi.oa.repository.TestTaskRepository;
import org.springframework.transaction.annotation.Transactional;
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;

import java.time.Instant;
import java.time.LocalDate;
import java.util.List;

/**
 * 实验室·偏差报告 OOS/OOT 调查闭环（实验任务与检测流程 §2 深化）。
 *
 * 把 TestTask 命中 OOS偏差 后“仅置态”补深为真正的偏差闭环：
 * 登记(open) → investigate 调查（写根因/结论，置「待决策」）→ decide 决策：
 *   - 复检：基于原任务克隆一张复检 TestTask（解锁结果待重测），偏差置「复检」；
 *   - 放行：经审核放行，偏差置「已放行」，原任务回到「待复核」；
 *   - 驳回：偏差置「已驳回」。
 *
 * 与 TestTask 真关联（taskId），跨实体推进。写口默认受 default-deny(ADMIN/APPROVER) 保护。
 */
@RestController
@RequestMapping("/api/oa/lab-deviations")
public class LabDeviationController {

    private static final List<String> TYPES = List.of("OOS", "OOT", "设备异常");
    private static final List<String> DECISIONS = List.of("复检", "放行", "驳回");

    private final LabDeviationRepository devRepo;
    private final TestTaskRepository taskRepo;

    public LabDeviationController(LabDeviationRepository devRepo, TestTaskRepository taskRepo) {
        this.devRepo = devRepo;
        this.taskRepo = taskRepo;
    }

    @GetMapping
    public ApiResp<List<LabDeviation>> list(@RequestParam(required = false) String status,
                                            @RequestParam(required = false) Long taskId) {
        if (taskId != null) {
            return ApiResp.ok(devRepo.findByTaskId(taskId));
        }
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(devRepo.findByStatus(status));
        }
        return ApiResp.ok(devRepo.findAll());
    }

    @GetMapping("/{id}")
    public ApiResp<LabDeviation> get(@PathVariable Long id) {
        return ApiResp.ok(must(id));
    }

    public record OpenRequest(Long taskId, String deviationType, String reporter, String description) {
    }

    /** 登记偏差：从检测任务带出上下文，落「登记」。 */
    @PostMapping
    @Transactional
    public ApiResp<LabDeviation> open(@RequestBody OpenRequest req) {
        if (req.taskId() == null) {
            throw new ApiException(400, "检测任务(taskId) 不能为空");
        }
        TestTask t = taskRepo.findById(req.taskId())
                .orElseThrow(() -> new ApiException(400, "检测任务不存在: " + req.taskId()));
        String type = req.deviationType() == null || req.deviationType().isBlank() ? "OOS" : req.deviationType();
        if (!TYPES.contains(type)) {
            throw new ApiException(400, "偏差类型只能是 " + TYPES);
        }
        LabDeviation d = new LabDeviation();
        d.setDeviationNo(type + "-" + (devRepo.count() + 1));
        d.setTaskId(t.getId());
        d.setTaskNo(t.getTaskNo());
        d.setSampleName(t.getSampleName());
        d.setDetectItem(t.getDetectItem());
        d.setDeviationType(type);
        d.setResultValue(t.getResultValue());
        d.setStandardLimit(t.getStandardLimit());
        d.setReporter(req.reporter());
        d.setDescription(req.description());
        d.setStatus("登记");
        d.setCreatedAt(Instant.now());
        // 任务进入偏差处理态。
        t.setStatus("偏差处理");
        taskRepo.save(t);
        return ApiResp.ok(devRepo.save(d));
    }

    public record InvestigateRequest(String investigator, String rootCause, String investigation) {
    }

    /** 调查：写调查人/根因/结论，置「待决策」。 */
    @PostMapping("/{id}/investigate")
    @Transactional
    public ApiResp<LabDeviation> investigate(@PathVariable Long id, @RequestBody InvestigateRequest req) {
        LabDeviation d = must(id);
        if ("已放行".equals(d.getStatus()) || "已驳回".equals(d.getStatus())) {
            throw new ApiException(409, "偏差已结案，不能再调查");
        }
        if (req.investigator() == null || req.investigator().isBlank()) {
            throw new ApiException(400, "调查人(investigator) 不能为空");
        }
        d.setInvestigator(req.investigator());
        d.setRootCause(req.rootCause());
        d.setInvestigation(req.investigation());
        d.setStatus("待决策");
        return ApiResp.ok(devRepo.save(d));
    }

    public record DecideRequest(String decision, String approver, String remark) {
    }

    /** 决策：复检（克隆复检任务）/ 放行 / 驳回。须先完成调查（待决策态）。 */
    @PostMapping("/{id}/decide")
    @Transactional
    public ApiResp<LabDeviation> decide(@PathVariable Long id, @RequestBody DecideRequest req) {
        LabDeviation d = must(id);
        if (!"待决策".equals(d.getStatus())) {
            throw new ApiException(409, "须先完成调查（待决策）才能决策，当前：" + d.getStatus());
        }
        String dec = req.decision();
        if (dec == null || !DECISIONS.contains(dec)) {
            throw new ApiException(400, "决策只能是 " + DECISIONS);
        }
        if (req.approver() == null || req.approver().isBlank()) {
            throw new ApiException(400, "决策人(approver) 不能为空");
        }
        d.setDecision(dec);
        d.setApprover(req.approver());
        TestTask orig = d.getTaskId() == null ? null : taskRepo.findById(d.getTaskId()).orElse(null);
        switch (dec) {
            case "复检" -> {
                if (orig == null) {
                    throw new ApiException(409, "原检测任务已不存在，无法复检");
                }
                TestTask re = cloneForRecheck(orig);
                TestTask saved = taskRepo.save(re);
                d.setRecheckTaskId(saved.getId());
                d.setStatus("复检");
            }
            case "放行" -> {
                if (orig != null) {
                    // 放行：偏差经审核接受，任务回到待复核继续主流程。
                    orig.setStatus("待复核");
                    taskRepo.save(orig);
                }
                d.setStatus("已放行");
                d.setClosedDate(LocalDate.now().toString());
            }
            default -> { // 驳回
                d.setStatus("已驳回");
                d.setClosedDate(LocalDate.now().toString());
            }
        }
        return ApiResp.ok(devRepo.save(d));
    }

    // ---------- helpers ----------

    private LabDeviation must(Long id) {
        return devRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("deviation not found: " + id));
    }

    /** 克隆原任务为复检任务：保留样品/项目/方法/仪器，清空结果与锁，置「检测中」。 */
    private TestTask cloneForRecheck(TestTask src) {
        TestTask re = new TestTask();
        re.setTaskNo("FJ-" + (taskRepo.count() + 1));
        re.setSampleId(src.getSampleId());
        re.setSampleNo(src.getSampleNo());
        re.setSampleName(src.getSampleName());
        re.setDetectItem(src.getDetectItem());
        re.setMethodNo(src.getMethodNo());
        re.setMethodName(src.getMethodName());
        re.setInstrumentId(src.getInstrumentId());
        re.setInstrumentName(src.getInstrumentName());
        re.setTester(src.getTester());
        re.setRelatedTo(src.getRelatedTo());
        re.setPriority("高");
        re.setStandardLimit(src.getStandardLimit());
        re.setResultUnit(src.getResultUnit());
        re.setStatus("检测中");
        re.setResultLocked(false);
        re.setRemark("OOS偏差复检（源任务 " + src.getTaskNo() + "）");
        re.setCreatedAt(Instant.now());
        return re;
    }
}