package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.Money;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.RdServiceAgency;
import com.kaidi.oa.repository.RdServiceAgencyRepository;
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.math.BigDecimal;
import java.math.RoundingMode;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;

/**
 * 创新研发中心·申报服务部 — 外部服务机构管理（需求 §6 服务机构管理）。
 *
 * 管理咨询公司、会计师事务所、专利代理机构等合作伙伴，记录合作项目、累计付款、
 * 以及多次服务质量评价滚动汇总的综合评分。
 * <ul>
 *   <li>CRUD：机构主档（类型/服务范围/联系人/电话/状态）；</li>
 *   <li>评价（/{id}/evaluate）：本次评分(1-5)累加进 ratingSum/ratingCount，
 *       综合评分 avgRating 由控制器在出参里派生；可选记一次合作（合作数+1、合同额累加）；</li>
 *   <li>列表出参带派生的 avgRating，支持按机构类型筛选。</li>
 * </ul>
 *
 * 联系人/电话属 PII，读侧收口（SENSITIVE_READ_PREFIXES，与 experts 一致）。
 * 金额一律 {@link Money}（BigDecimal）。评分用 BigDecimal 标度 2。
 */
@RestController
@RequestMapping("/api/oa/rd-service-agencies")
public class RdServiceAgencyController {

    private final RdServiceAgencyRepository repo;

    public RdServiceAgencyController(RdServiceAgencyRepository repo) {
        this.repo = repo;
    }

    /** 出参视图：机构 + 派生综合评分（avgRating = ratingSum/ratingCount，标度 2）。 */
    public record AgencyView(RdServiceAgency agency, double avgRating) {
    }

    private AgencyView toView(RdServiceAgency a) {
        return new AgencyView(a, avgRating(a));
    }

    private static double avgRating(RdServiceAgency a) {
        int n = a.getRatingCount() == null ? 0 : a.getRatingCount();
        if (n <= 0) {
            return 0d;
        }
        return Money.nz(a.getRatingSum())
                .divide(BigDecimal.valueOf(n), 2, RoundingMode.HALF_UP)
                .doubleValue();
    }

    @GetMapping
    public ApiResp<List<AgencyView>> list(@RequestParam(required = false) String agencyType,
                                          @RequestParam(required = false) String status) {
        List<RdServiceAgency> src;
        if (agencyType != null && !agencyType.isBlank()) {
            src = repo.findByAgencyType(agencyType);
        } else if (status != null && !status.isBlank()) {
            src = repo.findByStatus(status);
        } else {
            src = repo.findAll();
        }
        List<AgencyView> out = new ArrayList<>();
        for (RdServiceAgency a : src) {
            out.add(toView(a));
        }
        return ApiResp.ok(out);
    }

    @GetMapping("/{id}")
    public ApiResp<AgencyView> get(@PathVariable Long id) {
        RdServiceAgency a = repo.findById(id)
                .orElseThrow(() -> new NotFoundException("service agency not found: " + id));
        return ApiResp.ok(toView(a));
    }

    public record AgencyRequest(
            String name, String agencyType, String serviceScope, String contact, String phone,
            Long contractId, String contractNo,
            String status, String remark) {
    }

    @PostMapping
    public ApiResp<AgencyView> create(@RequestBody AgencyRequest req) {
        if (req.name() == null || req.name().isBlank()) {
            throw new ApiException(400, "机构名称(name) 不能为空");
        }
        RdServiceAgency a = new RdServiceAgency();
        a.setName(req.name().trim());
        a.setAgencyType(req.agencyType() == null || req.agencyType().isBlank() ? "咨询公司" : req.agencyType());
        a.setServiceScope(req.serviceScope());
        a.setContact(req.contact());
        a.setPhone(req.phone());
        a.setContractId(req.contractId());
        a.setContractNo(req.contractNo());
        a.setStatus(req.status() == null || req.status().isBlank() ? "合作中" : req.status());
        a.setRemark(req.remark());
        a.setCooperationCount(0);
        a.setContractAmount(Money.ZERO);
        a.setRatingSum(Money.ZERO);
        a.setRatingCount(0);
        a.setCreatedAt(Instant.now());
        return ApiResp.ok(toView(repo.save(a)));
    }

    @PatchMapping("/{id}")
    public ApiResp<AgencyView> update(@PathVariable Long id, @RequestBody AgencyRequest req) {
        RdServiceAgency a = repo.findById(id)
                .orElseThrow(() -> new NotFoundException("service agency not found: " + id));
        if (req.name() != null && !req.name().isBlank()) a.setName(req.name().trim());
        if (req.agencyType() != null && !req.agencyType().isBlank()) a.setAgencyType(req.agencyType());
        if (req.serviceScope() != null) a.setServiceScope(req.serviceScope());
        if (req.contact() != null) a.setContact(req.contact());
        if (req.phone() != null) a.setPhone(req.phone());
        if (req.contractId() != null) a.setContractId(req.contractId());
        if (req.contractNo() != null) a.setContractNo(req.contractNo());
        if (req.status() != null && !req.status().isBlank()) a.setStatus(req.status());
        if (req.remark() != null) a.setRemark(req.remark());
        // cooperationCount / contractAmount / ratingSum / ratingCount 仅由 evaluate 推进，禁止客户端直写。
        return ApiResp.ok(toView(repo.save(a)));
    }

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

    public record EvaluateRequest(Double score, Boolean recordCooperation, Double contractAmount, String remark) {
    }

    /**
     * 服务质量评价：本次评分(1-5)累加进 ratingSum/ratingCount，综合评分滚动更新。
     * recordCooperation=true 时同步记一次合作（合作数+1、合同额累加 contractAmount）。
     */
    @PostMapping("/{id}/evaluate")
    @Transactional
    public ApiResp<AgencyView> evaluate(@PathVariable Long id, @RequestBody EvaluateRequest req) {
        RdServiceAgency a = repo.findById(id)
                .orElseThrow(() -> new NotFoundException("service agency not found: " + id));
        if (req == null || req.score() == null) {
            throw new ApiException(400, "评分(score) 不能为空");
        }
        double s = req.score();
        if (!Double.isFinite(s) || s < 1 || s > 5) {
            throw new ApiException(400, "评分必须在 1-5 之间");
        }
        a.setRatingSum(Money.add(a.getRatingSum(), BigDecimal.valueOf(s)));
        a.setRatingCount((a.getRatingCount() == null ? 0 : a.getRatingCount()) + 1);
        if (Boolean.TRUE.equals(req.recordCooperation())) {
            a.setCooperationCount((a.getCooperationCount() == null ? 0 : a.getCooperationCount()) + 1);
            if (req.contractAmount() != null) {
                a.setContractAmount(Money.add(a.getContractAmount(), Money.of(req.contractAmount())));
            }
        }
        if (req.remark() != null && !req.remark().isBlank()) {
            a.setRemark(req.remark());
        }
        return ApiResp.ok(toView(repo.save(a)));
    }
}