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.SupervisionProject;
import com.kaidi.oa.domain.SvAccident;
import com.kaidi.oa.repository.SupervisionProjectRepository;
import com.kaidi.oa.repository.SvAccidentRepository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
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;

/**
 * 工程监理部 · 安全事故快速上报（补 Gap 6：SafetyCheckController 无 accident/伤亡专属流程）。
 *
 * 完整流程：
 *   快速上报（POST /）→ 已上报
 *   启动应急预案（POST /{id}/activate-emergency）→ 应急处置中
 *   移交调查（POST /{id}/investigate）→ 调查中
 *   归档整改措施（POST /{id}/archive）→ 整改归档
 *   确认闭环（POST /{id}/close）→ 已闭环
 *
 * 资源路径 /api/oa/sv-accidents。
 */
@RestController
@RequestMapping("/api/oa/sv-accidents")
public class SvAccidentController {

    private static final List<String> ACCIDENT_TYPES = List.of("伤亡事故", "财产损失", "险肇事故", "环境污染");
    private static final List<String> LEVELS = List.of("一般事故", "较大事故", "重大事故", "特别重大事故");

    private final SvAccidentRepository accidentRepo;
    private final SupervisionProjectRepository projectRepo;

    public SvAccidentController(SvAccidentRepository accidentRepo, SupervisionProjectRepository projectRepo) {
        this.accidentRepo = accidentRepo;
        this.projectRepo = projectRepo;
    }

    @GetMapping
    public ApiResp<List<SvAccident>> list(
            @RequestParam(required = false) Long projectId,
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String level) {
        if (projectId != null) {
            return ApiResp.ok(accidentRepo.findBySupervisionProjectIdOrderByIdDesc(projectId));
        }
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(accidentRepo.findByStatus(status));
        }
        if (level != null && !level.isBlank()) {
            return ApiResp.ok(accidentRepo.findByLevel(level));
        }
        return ApiResp.ok(accidentRepo.findAll());
    }

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

    public record ReportRequest(
            Long supervisionProjectId, String occurTime, String location,
            String accidentType, String level, String casualtyInfo,
            String preliminaryCause, String reporter, String attachmentRefs) {
    }

    /**
     * 快速上报安全事故：填基本信息 + 伤亡情况 + 初步原因，状态置「已上报」。
     * 重大/特别重大事故自动标记预警（level 字段）。
     */
    @PostMapping
    @Transactional
    public ApiResp<SvAccident> report(@RequestBody ReportRequest req) {
        if (req.supervisionProjectId() == null) {
            throw new ApiException(400, "所属监理项目(supervisionProjectId) 不能为空");
        }
        SupervisionProject parent = projectRepo.findById(req.supervisionProjectId())
                .orElseThrow(() -> new NotFoundException("supervision project not found: " + req.supervisionProjectId()));
        if (req.occurTime() == null || req.occurTime().isBlank()) {
            throw new ApiException(400, "事故发生时间(occurTime) 不能为空");
        }
        if (req.accidentType() != null && !req.accidentType().isBlank()
                && !ACCIDENT_TYPES.contains(req.accidentType())) {
            throw new ApiException(400, "事故类型无效，允许：" + ACCIDENT_TYPES);
        }
        if (req.level() != null && !req.level().isBlank() && !LEVELS.contains(req.level())) {
            throw new ApiException(400, "事故等级无效，允许：" + LEVELS);
        }
        SvAccident a = new SvAccident();
        a.setSupervisionProjectId(parent.getId());
        a.setProjectCode(parent.getCode());
        a.setAccidentNo("SGT-" + (accidentRepo.count() + 1));
        a.setOccurTime(req.occurTime());
        a.setLocation(req.location());
        a.setAccidentType(req.accidentType() == null || req.accidentType().isBlank()
                ? "伤亡事故" : req.accidentType());
        a.setLevel(req.level() == null || req.level().isBlank() ? "一般事故" : req.level());
        a.setCasualtyInfo(req.casualtyInfo());
        a.setPreliminaryCause(req.preliminaryCause());
        a.setReporter(req.reporter());
        a.setReportTime(Instant.now());
        a.setEmergencyActivated(false);
        a.setAttachmentRefs(req.attachmentRefs());
        a.setStatus("已上报");
        a.setCreatedAt(Instant.now());
        return ApiResp.ok(accidentRepo.save(a));
    }

    @PatchMapping("/{id}")
    public ApiResp<SvAccident> update(@PathVariable Long id, @RequestBody ReportRequest req) {
        SvAccident a = find(id);
        if ("已闭环".equals(a.getStatus())) {
            throw new ApiException(409, "已闭环的事故记录不可修改");
        }
        if (req.occurTime() != null && !req.occurTime().isBlank()) a.setOccurTime(req.occurTime());
        if (req.location() != null) a.setLocation(req.location());
        if (req.accidentType() != null && !req.accidentType().isBlank()) {
            if (!ACCIDENT_TYPES.contains(req.accidentType())) throw new ApiException(400, "事故类型无效：" + ACCIDENT_TYPES);
            a.setAccidentType(req.accidentType());
        }
        if (req.level() != null && !req.level().isBlank()) {
            if (!LEVELS.contains(req.level())) throw new ApiException(400, "事故等级无效：" + LEVELS);
            a.setLevel(req.level());
        }
        if (req.casualtyInfo() != null) a.setCasualtyInfo(req.casualtyInfo());
        if (req.preliminaryCause() != null) a.setPreliminaryCause(req.preliminaryCause());
        if (req.attachmentRefs() != null) a.setAttachmentRefs(req.attachmentRefs());
        return ApiResp.ok(accidentRepo.save(a));
    }

    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        SvAccident a = find(id);
        if (!"已上报".equals(a.getStatus())) {
            throw new ApiException(409, "仅「已上报」状态的事故记录可删除（撤回）");
        }
        accidentRepo.deleteById(id);
        return ApiResp.ok(null);
    }

    // ---------- 业务动作 ----------

    public record EmergencyRequest(String emergencyPlanRef, String emergencyDesc) {
    }

    /**
     * 启动应急预案：已上报 → 应急处置中。
     * 记录应急预案引用（关联 SvPlan.planType=监理应急预案）。
     */
    @PostMapping("/{id}/activate-emergency")
    @Transactional
    public ApiResp<SvAccident> activateEmergency(@PathVariable Long id, @RequestBody EmergencyRequest req) {
        SvAccident a = find(id);
        if (!"已上报".equals(a.getStatus())) {
            throw new ApiException(409, "仅「已上报」状态可启动应急，当前：" + a.getStatus());
        }
        if (Boolean.TRUE.equals(a.getEmergencyActivated())) {
            throw new ApiException(409, "应急预案已启动，请勿重复");
        }
        a.setEmergencyActivated(true);
        a.setEmergencyPlanRef(req.emergencyPlanRef());
        a.setEmergencyDesc(req.emergencyDesc());
        a.setStatus("应急处置中");
        return ApiResp.ok(accidentRepo.save(a));
    }

    public record InvestigateRequest(String investigationResult) {
    }

    /** 移交/进入事故调查：应急处置中 → 调查中。 */
    @PostMapping("/{id}/investigate")
    @Transactional
    public ApiResp<SvAccident> investigate(@PathVariable Long id, @RequestBody InvestigateRequest req) {
        SvAccident a = find(id);
        if (!"应急处置中".equals(a.getStatus())) {
            throw new ApiException(409, "请先启动应急预案，再进入调查阶段");
        }
        if (req.investigationResult() != null) a.setInvestigationResult(req.investigationResult());
        a.setStatus("调查中");
        return ApiResp.ok(accidentRepo.save(a));
    }

    public record ArchiveRequest(String correctiveMeasures, String correctiveDate, String investigationResult) {
    }

    /** 归档整改措施：调查中 → 整改归档。 */
    @PostMapping("/{id}/archive")
    @Transactional
    public ApiResp<SvAccident> archive(@PathVariable Long id, @RequestBody ArchiveRequest req) {
        SvAccident a = find(id);
        if (!"调查中".equals(a.getStatus())) {
            throw new ApiException(409, "请先进入调查阶段，再归档整改措施");
        }
        if (req.correctiveMeasures() == null || req.correctiveMeasures().isBlank()) {
            throw new ApiException(400, "整改措施(correctiveMeasures) 不能为空");
        }
        if (req.investigationResult() != null && !req.investigationResult().isBlank()) {
            a.setInvestigationResult(req.investigationResult());
        }
        a.setCorrectiveMeasures(req.correctiveMeasures());
        a.setCorrectiveDate(req.correctiveDate() == null || req.correctiveDate().isBlank()
                ? LocalDate.now().toString() : req.correctiveDate());
        a.setStatus("整改归档");
        return ApiResp.ok(accidentRepo.save(a));
    }

    /** 确认闭环：整改归档 → 已闭环。 */
    @PostMapping("/{id}/close")
    @Transactional
    public ApiResp<SvAccident> close(@PathVariable Long id) {
        SvAccident a = find(id);
        if (!"整改归档".equals(a.getStatus())) {
            throw new ApiException(409, "请先完成调查归档，再闭环");
        }
        a.setStatus("已闭环");
        return ApiResp.ok(accidentRepo.save(a));
    }

    private SvAccident find(Long id) {
        return accidentRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("sv-accident not found: " + id));
    }
}