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.FertMps;
import com.kaidi.oa.repository.FertMpsRepository;
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.math.BigDecimal;
import java.time.Instant;
import java.time.LocalDate;
import java.time.format.DateTimeParseException;
import java.util.List;

/**
 * 生物质肥料制造中心·主生产计划 MPS（需求 §2，补深审计 PARTIAL[med]）。
 *
 * 跨批次产能/排产/发酵周期整体编排：自动算净生产需求与最迟投料日期（按发酵周期反推），
 * 状态机 草稿→已下达→执行中→已完成，登记完工进度。
 * 写口受 AuthInterceptor default-deny(ADMIN/APPROVER) 保护，前缀已登记入 FINANCE/SENSITIVE_READ。
 */
@RestController
@RequestMapping("/api/oa/fert-mps")
public class FertMpsController {

    private final FertMpsRepository repo;

    public FertMpsController(FertMpsRepository repo) {
        this.repo = repo;
    }

    @GetMapping
    public ApiResp<List<FertMps>> list(@RequestParam(required = false) String status,
                                       @RequestParam(required = false) String period) {
        if (status != null && !status.isBlank()) return ApiResp.ok(repo.findByStatus(status));
        if (period != null && !period.isBlank()) return ApiResp.ok(repo.findByPeriod(period));
        return ApiResp.ok(repo.findAll());
    }

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

    public record MpsRequest(String planNo, String period, String productName, String productType,
                             Double demandQty, Double openingStock, Double inProductionQty,
                             Double safetyStock, Integer fermentDays, String planFinishDate,
                             String owner, String remark) {
    }

    @PostMapping
    public ApiResp<FertMps> create(@RequestBody MpsRequest req) {
        if (req.productName() == null || req.productName().isBlank()) {
            throw new ApiException(400, "产品名称(productName) 不能为空");
        }
        FertMps m = new FertMps();
        m.setPlanNo(req.planNo() == null || req.planNo().isBlank()
                ? "MPS-" + (repo.count() + 1) : req.planNo().trim());
        m.setStatus("草稿");
        m.setFinishedQty(BigDecimal.ZERO);
        m.setCreatedAt(Instant.now());
        apply(m, req);
        return ApiResp.ok(repo.save(m));
    }

    @PutMapping("/{id}")
    public ApiResp<FertMps> update(@PathVariable Long id, @RequestBody MpsRequest req) {
        FertMps m = find(id);
        if ("已完成".equals(m.getStatus())) {
            throw new ApiException(409, "已完成计划不可编辑");
        }
        apply(m, req);
        return ApiResp.ok(repo.save(m));
    }

    private void apply(FertMps m, MpsRequest req) {
        if (req.productName() != null && !req.productName().isBlank()) m.setProductName(req.productName().trim());
        m.setPeriod(req.period());
        m.setProductType(req.productType());
        BigDecimal demand = Money.of(req.demandQty());
        BigDecimal opening = Money.of(req.openingStock());
        BigDecimal inProd = Money.of(req.inProductionQty());
        BigDecimal safety = Money.of(req.safetyStock());
        m.setDemandQty(demand);
        m.setOpeningStock(opening);
        m.setInProductionQty(inProd);
        m.setSafetyStock(safety);
        // 净生产需求 = 需求 + 安全库存 - 期初库存 - 在产，下限 0。
        BigDecimal net = demand.add(safety).subtract(opening).subtract(inProd).max(BigDecimal.ZERO);
        m.setNetProductionQty(net);
        m.setFermentDays(req.fermentDays());
        m.setPlanFinishDate(req.planFinishDate());
        m.setLatestChargeDate(backCalcCharge(req.planFinishDate(), req.fermentDays()));
        m.setOwner(req.owner());
        m.setRemark(req.remark());
    }

    /** 最迟投料日期 = 计划完成日 - 发酵周期天数。 */
    private static String backCalcCharge(String planFinishDate, Integer fermentDays) {
        if (planFinishDate == null || planFinishDate.isBlank() || fermentDays == null || fermentDays <= 0) {
            return null;
        }
        try {
            return LocalDate.parse(planFinishDate.trim()).minusDays(fermentDays).toString();
        } catch (DateTimeParseException e) {
            return null;
        }
    }

    @PostMapping("/{id}/release")
    public ApiResp<FertMps> release(@PathVariable Long id) {
        FertMps m = find(id);
        if (!"草稿".equals(m.getStatus())) {
            throw new ApiException(409, "仅草稿计划可下达，当前：" + m.getStatus());
        }
        m.setStatus("已下达");
        return ApiResp.ok(repo.save(m));
    }

    public record ProgressRequest(Double finishedQty) {
    }

    @PostMapping("/{id}/progress")
    public ApiResp<FertMps> progress(@PathVariable Long id, @RequestBody ProgressRequest req) {
        FertMps m = find(id);
        if ("草稿".equals(m.getStatus()) || "已完成".equals(m.getStatus())) {
            throw new ApiException(409, "计划需已下达/执行中才能登记完工进度，当前：" + m.getStatus());
        }
        BigDecimal add = Money.of(req.finishedQty());
        if (add.signum() <= 0) {
            throw new ApiException(400, "完工量必须大于 0");
        }
        m.setFinishedQty(Money.of(m.getFinishedQty().add(add)));
        m.setStatus("执行中");
        if (m.getNetProductionQty().signum() > 0 && m.getFinishedQty().compareTo(m.getNetProductionQty()) >= 0) {
            m.setStatus("已完成");
        }
        return ApiResp.ok(repo.save(m));
    }

    @DeleteMapping("/{id}")
    public ApiResp<Void> delete(@PathVariable Long id) {
        repo.delete(find(id));
        return ApiResp.ok();
    }

    private FertMps find(Long id) {
        return repo.findById(id).orElseThrow(() -> new NotFoundException("主生产计划不存在：" + id));
    }
}