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.ProductRequirement;
import com.kaidi.oa.domain.RdAfterSalesFeedback;
import com.kaidi.oa.repository.ProductRequirementRepository;
import com.kaidi.oa.repository.RdAfterSalesFeedbackRepository;
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.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.util.List;

/**
 * 创新研发中心 / 产品开发部 · 售后改进需求反馈专属接口（需求模块 9 协同接口 - 售后部）。
 *
 * <p>补审计缺口"缺独立的售后改进需求反馈接口（仅有需求池内 reqType=改进但无专属售后来源标记）"：
 * <ul>
 *   <li>售后部门通过专属端点提交产品故障分析 / 改进建议（固定 source=售后），
 *       与普通需求池 /product-requirements 解耦；</li>
 *   <li>采纳后可一键转入 ProductRequirement 需求池（reqType=改进，source=售后），
 *       回填 convertedReqId 形成售后→需求池联动；</li>
 *   <li>统计端点按 feedbackType / severity 聚合，暴露给研发仪表盘决策支持（模块 10）。</li>
 * </ul>
 *
 * <p>写口受 AuthInterceptor FINANCE_PREFIXES（/api/oa/rd-after-sales-feedback）收口，
 * 敏感读已登记 SENSITIVE_READ_PREFIXES（见 sharedFileSnippets）。
 */
@RestController
@RequestMapping("/api/oa/rd-after-sales-feedback")
public class RdAfterSalesFeedbackController {

    private final RdAfterSalesFeedbackRepository feedbackRepo;
    private final ProductRequirementRepository reqRepo;

    public RdAfterSalesFeedbackController(RdAfterSalesFeedbackRepository feedbackRepo,
                                           ProductRequirementRepository reqRepo) {
        this.feedbackRepo = feedbackRepo;
        this.reqRepo = reqRepo;
    }

    // ---------- CRUD ----------

    @GetMapping
    public ApiResp<List<RdAfterSalesFeedback>> list(
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String feedbackType,
            @RequestParam(required = false) String severity) {
        if (status != null && !status.isBlank()) {
            return ApiResp.ok(feedbackRepo.findByStatus(status));
        }
        if (feedbackType != null && !feedbackType.isBlank()) {
            return ApiResp.ok(feedbackRepo.findByFeedbackType(feedbackType));
        }
        if (severity != null && !severity.isBlank()) {
            return ApiResp.ok(feedbackRepo.findBySeverity(severity));
        }
        return ApiResp.ok(feedbackRepo.findAll());
    }

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

    public record FeedbackRequest(
            String title, String feedbackType, String productLine, String productCode,
            String description, String submitter, String customerName, String severity) {
    }

    @PostMapping
    public ApiResp<RdAfterSalesFeedback> create(@RequestBody FeedbackRequest req) {
        if (req.title() == null || req.title().isBlank()) {
            throw new ApiException(400, "反馈标题(title) 不能为空");
        }
        RdAfterSalesFeedback f = new RdAfterSalesFeedback();
        f.setCode("ASF-" + (feedbackRepo.count() + 1));
        f.setTitle(req.title());
        f.setFeedbackType(blankTo(req.feedbackType(), "改进建议"));
        f.setProductLine(req.productLine());
        f.setProductCode(req.productCode());
        f.setDescription(req.description());
        f.setSubmitter(req.submitter());
        f.setCustomerName(req.customerName());
        f.setSeverity(blankTo(req.severity(), "中"));
        f.setStatus("待处理");
        f.setSource("售后");
        f.setCreatedAt(Instant.now());
        return ApiResp.ok(feedbackRepo.save(f));
    }

    @PutMapping("/{id}")
    public ApiResp<RdAfterSalesFeedback> update(@PathVariable Long id, @RequestBody FeedbackRequest req) {
        RdAfterSalesFeedback f = find(id);
        if (req.title() != null && !req.title().isBlank()) f.setTitle(req.title());
        if (req.feedbackType() != null && !req.feedbackType().isBlank()) f.setFeedbackType(req.feedbackType());
        if (req.productLine() != null) f.setProductLine(req.productLine());
        if (req.productCode() != null) f.setProductCode(req.productCode());
        if (req.description() != null) f.setDescription(req.description());
        if (req.submitter() != null) f.setSubmitter(req.submitter());
        if (req.customerName() != null) f.setCustomerName(req.customerName());
        if (req.severity() != null && !req.severity().isBlank()) f.setSeverity(req.severity());
        return ApiResp.ok(feedbackRepo.save(f));
    }

    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        if (!feedbackRepo.existsById(id)) {
            throw new NotFoundException("rdAfterSalesFeedback not found: " + id);
        }
        feedbackRepo.deleteById(id);
        return ApiResp.ok(null);
    }

    // ---------- 状态机：采纳 / 拒绝 ----------

    public record OpinionRequest(String opinion) {
    }

    /** 研发侧采纳：待处理 → 已采纳。 */
    @PostMapping("/{id}/accept")
    public ApiResp<RdAfterSalesFeedback> accept(@PathVariable Long id,
                                                 @RequestBody(required = false) OpinionRequest req) {
        RdAfterSalesFeedback f = find(id);
        if (!"待处理".equals(f.getStatus())) {
            throw new ApiException(409, "仅待处理的反馈可采纳，当前状态：" + f.getStatus());
        }
        f.setStatus("已采纳");
        f.setRdOpinion(req == null ? null : req.opinion());
        return ApiResp.ok(feedbackRepo.save(f));
    }

    /** 研发侧拒绝：待处理 → 已拒绝。 */
    @PostMapping("/{id}/reject")
    public ApiResp<RdAfterSalesFeedback> reject(@PathVariable Long id,
                                                  @RequestBody(required = false) OpinionRequest req) {
        RdAfterSalesFeedback f = find(id);
        if (!"待处理".equals(f.getStatus())) {
            throw new ApiException(409, "仅待处理的反馈可拒绝，当前状态：" + f.getStatus());
        }
        f.setStatus("已拒绝");
        f.setRdOpinion(req == null ? null : req.opinion());
        return ApiResp.ok(feedbackRepo.save(f));
    }

    /**
     * 一键转入需求池：已采纳 → 已转需求池，自动在 ProductRequirement 表建记录
     * （reqType=改进，source=售后，priority 继承 severity 映射），回填 convertedReqId。
     */
    @PostMapping("/{id}/convert-to-req")
    @Transactional
    public ApiResp<RdAfterSalesFeedback> convertToReq(@PathVariable Long id) {
        RdAfterSalesFeedback f = find(id);
        if (!"已采纳".equals(f.getStatus())) {
            throw new ApiException(409, "仅已采纳的反馈可转入需求池，当前状态：" + f.getStatus());
        }
        if (f.getConvertedReqId() != null) {
            throw new ApiException(409, "该反馈已转需求池（需求编号 REQ-" + f.getConvertedReqId() + "），不可重复转换");
        }
        ProductRequirement r = new ProductRequirement();
        r.setCode("REQ-ASF-" + f.getId());
        r.setTitle("[售后改进] " + f.getTitle());
        r.setDetail(f.getDescription());
        r.setSource("售后");
        r.setProposer(f.getSubmitter());
        r.setReqType("改进");
        r.setProductLine(f.getProductLine());
        // 严重程度 → 优先级映射：高→高，中→中，低→低
        r.setPriority(mapSeverity(f.getSeverity()));
        r.setStatus("待评审");
        r.setCreatedAt(Instant.now());
        ProductRequirement saved = reqRepo.save(r);

        f.setStatus("已转需求池");
        f.setConvertedReqId(saved.getId());
        feedbackRepo.save(f);
        return ApiResp.ok(f);
    }

    // ---------- 统计聚合（供研发仪表盘）----------

    public record FeedbackStats(int total, int pending, int accepted, int converted, int rejected,
                                int highSeverity, int midSeverity, int lowSeverity) {
    }

    @GetMapping("/stats")
    public ApiResp<FeedbackStats> stats() {
        List<RdAfterSalesFeedback> all = feedbackRepo.findAll();
        int pending = 0, accepted = 0, converted = 0, rejected = 0;
        int hi = 0, mid = 0, lo = 0;
        for (RdAfterSalesFeedback f : all) {
            switch (blankTo(f.getStatus(), "待处理")) {
                case "待处理" -> pending++;
                case "已采纳" -> accepted++;
                case "已转需求池" -> converted++;
                case "已拒绝" -> rejected++;
                default -> { }
            }
            switch (blankTo(f.getSeverity(), "中")) {
                case "高" -> hi++;
                case "中" -> mid++;
                case "低" -> lo++;
                default -> { }
            }
        }
        return ApiResp.ok(new FeedbackStats(all.size(), pending, accepted, converted, rejected, hi, mid, lo));
    }

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

    private RdAfterSalesFeedback find(Long id) {
        return feedbackRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("rdAfterSalesFeedback not found: " + id));
    }

    private static String blankTo(String v, String dft) {
        return v == null || v.isBlank() ? dft : v;
    }

    private static String mapSeverity(String severity) {
        if ("高".equals(severity)) return "高";
        if ("低".equals(severity)) return "低";
        return "中";
    }
}