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.AuditProject;
import com.kaidi.oa.domain.AuditQualityReview;
import com.kaidi.oa.repository.AuditProjectRepository;
import com.kaidi.oa.repository.AuditQualityReviewRepository;
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.PutMapping;
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.time.Year;
import java.util.List;

/**
 * 审计质量复核（内控部·审计监察部·第10模块）。
 *
 * 解决审计缺口：「独立质量复核流程（项目完成后指定独立复核人，质量检查程序执行记录、
 * 证据充分性、底稿规范性的结论实体）」。
 *
 * 核心功能：
 *  - POST /                     新建质量复核（草稿）；
 *  - PATCH /{id}/start-review   启动复核（草稿→复核中）；
 *  - PATCH /{id}/complete       填写三维评分+综合结论，完成复核（复核中→已完成）；
 *                               综合评分自动加权：程序40%+证据35%+底稿25%；
 *                               结论自动初稿：90+优良/75+合格/60+需改进/否则不合格；
 *  - GET /?projectId=           按审计项目查询复核记录；
 *  - GET /stats                 复核质量趋势统计（按月统计平均综合评分）；
 *  - PUT /{id}                  修改（复核中阶段）；
 *  - DELETE /{id}               删除（仅草稿阶段）。
 */
@RestController
@RequestMapping("/api/oa/audit-quality-reviews")
public class AuditQualityReviewController {

    private final AuditQualityReviewRepository reviewRepo;
    private final AuditProjectRepository projectRepo;

    public AuditQualityReviewController(AuditQualityReviewRepository reviewRepo,
                                        AuditProjectRepository projectRepo) {
        this.reviewRepo = reviewRepo;
        this.projectRepo = projectRepo;
    }

    @GetMapping
    public ApiResp<List<AuditQualityReview>> list(
            @RequestParam(required = false) Long projectId,
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String reviewer) {
        if (projectId != null) {
            return ApiResp.ok(reviewRepo.findByProjectId(projectId));
        }
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(reviewRepo.findByStatus(status));
        }
        if (reviewer != null && !reviewer.isBlank()) {
            return ApiResp.ok(reviewRepo.findByReviewer(reviewer));
        }
        return ApiResp.ok(reviewRepo.findByOrderByIdDesc());
    }

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

    /**
     * 复核质量趋势：按月统计已完成的复核记录平均综合评分（辅助质量管理）。
     */
    @GetMapping("/stats")
    public ApiResp<Object> stats() {
        List<AuditQualityReview> completed = reviewRepo.findByStatus("已完成");
        // 按 reviewDate 年月聚合平均分。
        var byMonth = new java.util.LinkedHashMap<String, List<Integer>>();
        for (AuditQualityReview r : completed) {
            String month = r.getReviewDate() == null ? "未知"
                    : r.getReviewDate().substring(0, Math.min(7, r.getReviewDate().length()));
            byMonth.computeIfAbsent(month, k -> new java.util.ArrayList<>()).add(r.getOverallScore());
        }
        var trend = byMonth.entrySet().stream().map(e -> {
            double avg = e.getValue().stream().mapToInt(Integer::intValue).average().orElse(0);
            return java.util.Map.of("month", e.getKey(),
                    "count", e.getValue().size(),
                    "avgScore", Math.round(avg * 10) / 10.0);
        }).toList();
        return ApiResp.ok(java.util.Map.of("trend", trend, "totalCompleted", completed.size()));
    }

    public record CreateRequest(
            Long projectId, String reviewer, String reviewDate, String notes) {
    }

    @PostMapping
    public ApiResp<AuditQualityReview> create(@RequestBody CreateRequest req) {
        if (req.projectId() == null) {
            throw new ApiException(400, "请选择关联审计项目");
        }
        if (req.reviewer() == null || req.reviewer().isBlank()) {
            throw new ApiException(400, "复核人不能为空");
        }
        AuditProject proj = projectRepo.findById(req.projectId())
                .orElseThrow(() -> new ApiException(400, "审计项目不存在: " + req.projectId()));

        // 独立性校验：复核人不能与项目负责人相同。
        if (req.reviewer().equals(proj.getLeadAuditor())) {
            throw new ApiException(409, "复核人不能与审计项目负责人相同（违反独立性原则）");
        }

        AuditQualityReview r = new AuditQualityReview();
        r.setReviewNo(nextReviewNo());
        r.setProjectId(proj.getId());
        r.setProjectName(proj.getName());
        r.setReviewer(req.reviewer());
        r.setReviewDate(req.reviewDate() != null ? req.reviewDate() : LocalDate.now().toString());
        r.setStatus("草稿");
        r.setCreatedAt(Instant.now());
        return ApiResp.ok(reviewRepo.save(r));
    }

    /** 启动复核（草稿 → 复核中）。 */
    @PatchMapping("/{id}/start-review")
    public ApiResp<AuditQualityReview> startReview(@PathVariable Long id) {
        AuditQualityReview r = load(id);
        if (!"草稿".equals(r.getStatus())) {
            throw new ApiException(409, "只有草稿状态可启动复核（当前：" + r.getStatus() + "）");
        }
        r.setStatus("复核中");
        return ApiResp.ok(reviewRepo.save(r));
    }

    public record CompleteRequest(
            int procedureScore, int evidenceScore, int workpaperScore,
            String procedureComment, String evidenceComment, String workpaperComment,
            String overallComment, String overallResult,
            boolean improvementRequired, String improvementItems) {
    }

    /**
     * 填写三维评分并完成复核（复核中 → 已完成）。
     * 综合评分加权：程序执行×40% + 证据充分性×35% + 底稿规范性×25%。
     * 结论自动初稿（可被 overallResult 覆盖）：90+优良/75+合格/60+需改进/否则不合格。
     */
    @PatchMapping("/{id}/complete")
    public ApiResp<AuditQualityReview> complete(@PathVariable Long id,
                                               @RequestBody CompleteRequest req) {
        AuditQualityReview r = load(id);
        if (!"复核中".equals(r.getStatus())) {
            throw new ApiException(409, "只有复核中状态可提交结论（当前：" + r.getStatus() + "）");
        }
        int ps = clamp(req.procedureScore());
        int es = clamp(req.evidenceScore());
        int ws = clamp(req.workpaperScore());
        r.setProcedureScore(ps);
        r.setEvidenceScore(es);
        r.setWorkpaperScore(ws);

        // 加权综合评分。
        int overall = (int) Math.round(ps * 0.4 + es * 0.35 + ws * 0.25);
        r.setOverallScore(overall);

        // 自动结论初稿。
        String autoResult = overall >= 90 ? "优良"
                : overall >= 75 ? "合格"
                : overall >= 60 ? "需改进"
                : "不合格";
        r.setOverallResult(req.overallResult() != null && !req.overallResult().isBlank()
                ? req.overallResult() : autoResult);

        r.setProcedureComment(req.procedureComment());
        r.setEvidenceComment(req.evidenceComment());
        r.setWorkpaperComment(req.workpaperComment());
        r.setOverallComment(req.overallComment());
        r.setImprovementRequired(req.improvementRequired());
        r.setImprovementItems(req.improvementItems());
        r.setStatus("已完成");
        return ApiResp.ok(reviewRepo.save(r));
    }

    public record UpdateRequest(String reviewer, String reviewDate, String notes) {
    }

    @PutMapping("/{id}")
    public ApiResp<AuditQualityReview> update(@PathVariable Long id,
                                              @RequestBody UpdateRequest req) {
        AuditQualityReview r = load(id);
        if ("已完成".equals(r.getStatus())) {
            throw new ApiException(409, "已完成的复核不允许修改");
        }
        if (req.reviewer() != null && !req.reviewer().isBlank()) r.setReviewer(req.reviewer());
        if (req.reviewDate() != null) r.setReviewDate(req.reviewDate());
        return ApiResp.ok(reviewRepo.save(r));
    }

    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        AuditQualityReview r = load(id);
        if (!"草稿".equals(r.getStatus())) {
            throw new ApiException(409, "只有草稿阶段的复核可以删除（当前：" + r.getStatus() + "）");
        }
        reviewRepo.deleteById(id);
        return ApiResp.ok(null);
    }

    private AuditQualityReview load(Long id) {
        return reviewRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("审计质量复核不存在: " + id));
    }

    private String nextReviewNo() {
        String year = String.valueOf(Year.now().getValue());
        long seq = reviewRepo.count() + 1;
        return String.format("QR-%s-%03d", year, seq);
    }

    private static int clamp(int v) {
        return Math.min(100, Math.max(0, v));
    }
}