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.SafetyTraining;
import com.kaidi.oa.domain.TrainingEnrollment;
import com.kaidi.oa.repository.SafetyTrainingRepository;
import com.kaidi.oa.repository.TrainingEnrollmentRepository;
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;

/**
 * 质安部·安全培训计划与执行（需求 §2 安全培训与教育 + §7 培训计划与执行）。补深审计 high/med 缺口：
 * 三级教育/特种作业复训/培训计划 + 在线报名 + 签到 + 考核成绩自动判定 + 培训记录归档个人档案。
 *
 * 培训状态机：计划 → 报名中（开放报名）→ 进行中（开班）→ 已完成（结业，自动按及格分判定通过并可归档）。
 * 学员明细 enrollment：报名 → 签到 → 录成绩（按培训 passScore 自动判 passed）→ 归档个人档案。
 *
 * 写口默认受 AuthInterceptor default-deny(ADMIN/APPROVER) 保护。
 */
@RestController
@RequestMapping("/api/oa/safety-trainings")
public class SafetyTrainingController {

    private final SafetyTrainingRepository trainRepo;
    private final TrainingEnrollmentRepository enrollRepo;

    public SafetyTrainingController(SafetyTrainingRepository trainRepo,
                                    TrainingEnrollmentRepository enrollRepo) {
        this.trainRepo = trainRepo;
        this.enrollRepo = enrollRepo;
    }

    // ---------- 培训计划 CRUD ----------

    @GetMapping
    public ApiResp<List<SafetyTraining>> list(@RequestParam(required = false) String status,
                                              @RequestParam(required = false) String trainType) {
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(trainRepo.findByStatus(status));
        }
        if (trainType != null && !trainType.isBlank()) {
            return ApiResp.ok(trainRepo.findByTrainType(trainType));
        }
        return ApiResp.ok(trainRepo.findAll());
    }

    @GetMapping("/{id}")
    public ApiResp<SafetyTraining> get(@PathVariable Long id) {
        return ApiResp.ok(trainRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("training not found: " + id)));
    }

    public record TrainRequest(String code, String title, String trainType, String dept,
                               String lecturer, String planDate, Integer hours, Integer passScore,
                               String content) {
    }

    @PostMapping
    public ApiResp<SafetyTraining> create(@RequestBody TrainRequest req) {
        if (req.title() == null || req.title().isBlank()) {
            throw new ApiException(400, "培训主题不能为空");
        }
        SafetyTraining t = new SafetyTraining();
        t.setCode(req.code() == null || req.code().isBlank() ? "PX-" + (trainRepo.count() + 1) : req.code());
        t.setTitle(req.title());
        t.setTrainType(req.trainType() == null || req.trainType().isBlank() ? "日常培训" : req.trainType());
        t.setDept(req.dept());
        t.setLecturer(req.lecturer());
        t.setPlanDate(req.planDate());
        t.setHours(req.hours());
        t.setPassScore(req.passScore() == null ? 60 : req.passScore());
        t.setContent(req.content());
        t.setStatus("计划");
        t.setCreatedAt(Instant.now());
        return ApiResp.ok(trainRepo.save(t));
    }

    @PatchMapping("/{id}")
    public ApiResp<SafetyTraining> update(@PathVariable Long id, @RequestBody TrainRequest req) {
        SafetyTraining t = trainRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("training not found: " + id));
        if ("已完成".equals(t.getStatus())) {
            throw new ApiException(409, "已完成培训不可编辑");
        }
        if (req.title() != null && !req.title().isBlank()) t.setTitle(req.title());
        if (req.trainType() != null && !req.trainType().isBlank()) t.setTrainType(req.trainType());
        if (req.dept() != null) t.setDept(req.dept());
        if (req.lecturer() != null) t.setLecturer(req.lecturer());
        if (req.planDate() != null) t.setPlanDate(req.planDate());
        if (req.hours() != null) t.setHours(req.hours());
        if (req.passScore() != null) t.setPassScore(req.passScore());
        if (req.content() != null) t.setContent(req.content());
        return ApiResp.ok(trainRepo.save(t));
    }

    @DeleteMapping("/{id}")
    @Transactional
    public ApiResp<Void> delete(@PathVariable Long id) {
        SafetyTraining t = trainRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("training not found: " + id));
        for (TrainingEnrollment e : enrollRepo.findByTrainingId(id)) {
            enrollRepo.deleteById(e.getId());
        }
        trainRepo.deleteById(t.getId());
        return ApiResp.ok(null);
    }

    /** 状态推进：计划→报名中→进行中→已完成。已完成时自动结业判定（按及格分判 passed）。 */
    @PostMapping("/{id}/advance")
    @Transactional
    public ApiResp<SafetyTraining> advance(@PathVariable Long id) {
        SafetyTraining t = trainRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("training not found: " + id));
        String next = switch (t.getStatus() == null ? "" : t.getStatus()) {
            case "计划" -> "报名中";
            case "报名中" -> "进行中";
            case "进行中" -> "已完成";
            default -> null;
        };
        if (next == null) {
            throw new ApiException(409, "当前状态不可推进（" + t.getStatus() + "）");
        }
        if ("已完成".equals(next)) {
            int pass = t.getPassScore() == null ? 60 : t.getPassScore();
            for (TrainingEnrollment e : enrollRepo.findByTrainingId(id)) {
                if (e.getScore() != null) {
                    e.setPassed(e.getScore() >= pass);
                    enrollRepo.save(e);
                }
            }
        }
        t.setStatus(next);
        return ApiResp.ok(trainRepo.save(t));
    }

    // ---------- 学员 报名/签到/成绩/归档 ----------

    @GetMapping("/{trainingId}/enrollments")
    public ApiResp<List<TrainingEnrollment>> enrollments(@PathVariable Long trainingId) {
        if (!trainRepo.existsById(trainingId)) {
            throw new NotFoundException("training not found: " + trainingId);
        }
        return ApiResp.ok(enrollRepo.findByTrainingId(trainingId));
    }

    public record EnrollRequest(String traineeName, String dept) {
    }

    /** 报名：培训需未完成。同培训同名学员去重。 */
    @PostMapping("/{trainingId}/enroll")
    @Transactional
    public ApiResp<TrainingEnrollment> enroll(@PathVariable Long trainingId, @RequestBody EnrollRequest req) {
        SafetyTraining t = trainRepo.findById(trainingId)
                .orElseThrow(() -> new NotFoundException("training not found: " + trainingId));
        if ("已完成".equals(t.getStatus())) {
            throw new ApiException(409, "培训已结束，不能报名");
        }
        if (req.traineeName() == null || req.traineeName().isBlank()) {
            throw new ApiException(400, "学员姓名不能为空");
        }
        for (TrainingEnrollment e : enrollRepo.findByTrainingId(trainingId)) {
            if (req.traineeName().equals(e.getTraineeName())) {
                throw new ApiException(409, "该学员已报名");
            }
        }
        TrainingEnrollment e = new TrainingEnrollment();
        e.setTrainingId(trainingId);
        e.setTraineeName(req.traineeName());
        e.setDept(req.dept());
        e.setSignedIn(false);
        e.setPassed(false);
        e.setArchived(false);
        e.setCreatedAt(Instant.now());
        return ApiResp.ok(enrollRepo.save(e));
    }

    /** 签到（二维码/人脸签到的服务端落点）。 */
    @PostMapping("/enrollments/{eid}/sign-in")
    public ApiResp<TrainingEnrollment> signIn(@PathVariable Long eid) {
        TrainingEnrollment e = enrollRepo.findById(eid)
                .orElseThrow(() -> new NotFoundException("enrollment not found: " + eid));
        e.setSignedIn(true);
        e.setSignInDate(LocalDate.now().toString());
        return ApiResp.ok(enrollRepo.save(e));
    }

    public record ScoreRequest(Integer score) {
    }

    /** 录入考核成绩：按培训及格分自动判定是否通过。 */
    @PostMapping("/enrollments/{eid}/score")
    public ApiResp<TrainingEnrollment> score(@PathVariable Long eid, @RequestBody ScoreRequest req) {
        TrainingEnrollment e = enrollRepo.findById(eid)
                .orElseThrow(() -> new NotFoundException("enrollment not found: " + eid));
        if (req.score() == null) {
            throw new ApiException(400, "成绩不能为空");
        }
        SafetyTraining t = trainRepo.findById(e.getTrainingId())
                .orElseThrow(() -> new NotFoundException("training not found: " + e.getTrainingId()));
        int pass = t.getPassScore() == null ? 60 : t.getPassScore();
        e.setScore(req.score());
        e.setPassed(req.score() >= pass);
        return ApiResp.ok(enrollRepo.save(e));
    }

    /** 归档至个人档案（与需求"培训记录自动归档至个人档案"一致）。 */
    @PostMapping("/enrollments/{eid}/archive")
    public ApiResp<TrainingEnrollment> archive(@PathVariable Long eid) {
        TrainingEnrollment e = enrollRepo.findById(eid)
                .orElseThrow(() -> new NotFoundException("enrollment not found: " + eid));
        if (e.getScore() == null) {
            throw new ApiException(409, "未录成绩，不能归档");
        }
        e.setArchived(true);
        return ApiResp.ok(enrollRepo.save(e));
    }

    // ---------- 培训统计 ----------

    public record TrainStat(Long trainingId, String code, String title, long enrolled, long signedIn,
                            long scored, long passed, double signInRate, double passRate) {
    }

    /** 单次培训统计：参训/签到/考核/通过 + 签到率/通过率。 */
    @GetMapping("/{id}/stat")
    public ApiResp<TrainStat> stat(@PathVariable Long id) {
        SafetyTraining t = trainRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("training not found: " + id));
        List<TrainingEnrollment> es = enrollRepo.findByTrainingId(id);
        long enrolled = es.size(), signedIn = 0, scored = 0, passed = 0;
        for (TrainingEnrollment e : es) {
            if (e.isSignedIn()) signedIn++;
            if (e.getScore() != null) scored++;
            if (e.isPassed()) passed++;
        }
        double signRate = enrolled == 0 ? 0 : Math.round(signedIn * 1000.0 / enrolled) / 10.0;
        double passRate = scored == 0 ? 0 : Math.round(passed * 1000.0 / scored) / 10.0;
        return ApiResp.ok(new TrainStat(t.getId(), t.getCode(), t.getTitle(), enrolled, signedIn,
                scored, passed, signRate, passRate));
    }
}