package handler

import (
	"net/http"

	"bj_power_wms/ent"
	"bj_power_wms/ent/inbounddetail"
	"bj_power_wms/ent/inboundorder"
	"bj_power_wms/ent/inventory"
	"bj_power_wms/ent/material"
	"bj_power_wms/internal/svc"

	"github.com/google/uuid"
	"github.com/zeromicro/go-zero/core/logx"
)

// createInboundHandler 入库
// 结构件: { inboundType, materialCode, batchNo, quantity, zoneCode, operator }
// 精密件: { inboundType, materialCode, snList: [sn...], zoneCode, operator }
//
// 事务保证：入库单 + 库存行(inventory) + 入库明细 三者要么全成功，要么全回滚，杜绝半成品状态。
func createInboundHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			InboundType    string   `json:"inboundType"` // purchase/semi/finished/return
			MaterialCode   string   `json:"materialCode"`
			BatchNo        string   `json:"batchNo"`
			Quantity       int      `json:"quantity"`
			SnList         []string `json:"snList"`
			ZoneCode       string   `json:"zoneCode"`
			Operator       string   `json:"operator"`
			ProductionDate string   `json:"productionDate"`
			Supplier       string   `json:"supplier"`
			Remark         string   `json:"remark"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误: "+err.Error())
			return
		}
		if req.MaterialCode == "" {
			fail(w, http.StatusBadRequest, "物料编码必填")
			return
		}
		if req.ZoneCode == "" {
			fail(w, http.StatusBadRequest, "区域必填，请先选择入库区域")
			return
		}

		// 物料档案
		m, err := ctx.EntClient.Material.Query().
			Where(material.CodeEQ(req.MaterialCode)).
			Only(ctx0())
		if err != nil {
			fail(w, http.StatusBadRequest, "物料不存在: "+req.MaterialCode)
			return
		}

		inboundNo := "IB" + uuid.NewString()[:12]

		// 开启事务：入库单 + 库存行 + 明细 原子提交
		tx, err := ctx.EntClient.Tx(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, "开启事务失败: "+err.Error())
			return
		}
		committed := false
		defer func() {
			if !committed {
				_ = tx.Rollback()
			}
		}()

		ib, err := tx.InboundOrder.Create().
			SetInboundNo(inboundNo).
			SetNillableInboundType(strPtr(req.InboundType)).
			SetMaterialCode(req.MaterialCode).
			SetNillableMaterialName(strPtr(m.Name)).
			SetManageMode(m.ManageMode).
			SetNillableZoneCode(strPtr(req.ZoneCode)).
			SetQuantity(0).
			SetNillableOperator(strPtr(req.Operator)).
			SetNillableRemark(strPtr(req.Remark)).
			Save(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, "创建入库单失败: "+err.Error())
			return
		}

		totalQty := 0

		// 结构件（批次管理）
		if m.ManageMode == 1 {
			// 结构件走批次入库，不允许携带 SN 清单
			if len(req.SnList) > 0 {
				fail(w, http.StatusBadRequest, "该物料为结构件（按批次管理），不应提交 SN 清单，请使用『结构件入库』")
				return
			}
			batchNo := req.BatchNo
			if batchNo == "" {
				batchNo = genBatchNo(req.MaterialCode)
			}
			qty := req.Quantity
			if qty <= 0 {
				fail(w, http.StatusBadRequest, "数量必填且大于 0，请输入本次入库数量")
				return
			}

			// 同批次追加（多批到货追加）
			existing, e := tx.Inventory.Query().
				Where(inventory.ManageModeEQ(1), inventory.BatchNoEQ(batchNo)).Only(ctx0())
			if e == nil {
				if _, err = tx.Inventory.UpdateOneID(existing.ID).
					AddQuantity(qty).
					SetNillableSupplier(strPtr(req.Supplier)).
					Save(ctx0()); err != nil {
					fail(w, http.StatusInternalServerError, "追加批次失败: "+err.Error())
					return
				}
			} else {
				if _, err = tx.Inventory.Create().
					SetManageMode(1).
					SetMaterialCode(req.MaterialCode).
					SetNillableMaterialName(strPtr(m.Name)).
					SetBatchNo(batchNo).
					SetQuantity(qty).SetLockedQty(0).
					SetNillableProductionDate(strPtr(req.ProductionDate)).
					SetNillableSupplier(strPtr(req.Supplier)).
					SetQualityStatus("未检").
					SetNillableZoneCode(strPtr(req.ZoneCode)).
					SetStatus("在库").
					SetInboundNo(inboundNo).
					Save(ctx0()); err != nil {
					fail(w, http.StatusInternalServerError, "创建库存行失败: "+err.Error())
					return
				}
			}

			// 明细
			if _, err = tx.InboundDetail.Create().
				SetInboundNo(inboundNo).
				SetBatchNo(batchNo).
				SetMaterialCode(req.MaterialCode).
				SetQuantity(qty).
				Save(ctx0()); err != nil {
				fail(w, http.StatusInternalServerError, "创建入库明细失败: "+err.Error())
				return
			}
			totalQty = qty
		}

		// 精密件（SN 管理）
		if m.ManageMode == 2 {
			if len(req.SnList) == 0 {
				fail(w, http.StatusBadRequest, "该物料为精密件（按 SN 管理），请至少录入 1 条序列号(SN)")
				return
			}
			for _, sn := range req.SnList {
				// 查重
				exists, _ := tx.Inventory.Query().
					Where(inventory.ManageModeEQ(2), inventory.SnCodeEQ(sn)).
					Exist(ctx0())
				if exists {
					fail(w, http.StatusConflict, "SN 已存在: "+sn)
					return
				}
				if _, err = tx.Inventory.Create().
					SetManageMode(2).
					SetMaterialCode(req.MaterialCode).
					SetNillableMaterialName(strPtr(m.Name)).
					SetSnCode(sn).
					SetQuantity(1).SetLockedQty(0).
					SetQualityStatus("未检").
					SetNillableZoneCode(strPtr(req.ZoneCode)).
					SetStatus("在库").
					SetInboundNo(inboundNo).
					Save(ctx0()); err != nil {
					fail(w, http.StatusInternalServerError, "创建 SN 库存行失败: "+err.Error())
					return
				}
				if _, err = tx.InboundDetail.Create().
					SetInboundNo(inboundNo).
					SetSnCode(sn).
					SetMaterialCode(req.MaterialCode).
					SetQuantity(1).
					Save(ctx0()); err != nil {
					fail(w, http.StatusInternalServerError, "创建入库明细失败: "+err.Error())
					return
				}
			}
			totalQty = len(req.SnList)
		}

		// 更新入库单数量
		if _, err = tx.InboundOrder.UpdateOneID(ib.ID).
			SetQuantity(totalQty).Save(ctx0()); err != nil {
			fail(w, http.StatusInternalServerError, "更新入库单数量失败: "+err.Error())
			return
		}

		if err = tx.Commit(); err != nil {
			fail(w, http.StatusInternalServerError, "提交事务失败: "+err.Error())
			return
		}
		committed = true

		logx.Infof("inbound: no=%s material=%s qty=%d by=%s", inboundNo, req.MaterialCode, totalQty, req.Operator)
		ok(w, map[string]any{
			"inboundNo": inboundNo,
			"quantity":  totalQty,
			"batchNo":   req.BatchNo,
			"snCount":   len(req.SnList),
		})
	}
}

// excelInboundHandler 实现见 excel.go

// queryInboundHandler 入库单查询
func queryInboundHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		page := atoi(r.URL.Query().Get("page"), 1)
		pageSize := atoi(r.URL.Query().Get("pageSize"), 20)
		materialCode := r.URL.Query().Get("materialCode")
		inboundType := r.URL.Query().Get("inboundType")
		inboundNo := r.URL.Query().Get("inboundNo")

		q := ctx.EntClient.InboundOrder.Query()
		if materialCode != "" {
			q = q.Where(inboundorder.MaterialCodeEQ(materialCode))
		}
		if inboundType != "" {
			q = q.Where(inboundorder.InboundTypeEQ(inboundType))
		}
		if inboundNo != "" {
			q = q.Where(inboundorder.InboundNoEQ(inboundNo))
		}

		total, err := q.Count(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		list, err := q.Order(ent.Desc("id")).
			Offset((page - 1) * pageSize).Limit(pageSize).All(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}

		type row struct {
			*ent.InboundOrder
			Details []*ent.InboundDetail `json:"details"`
		}
		rows := make([]row, 0, len(list))
		for _, ib := range list {
			details, _ := ctx.EntClient.InboundDetail.Query().
				Where(inbounddetail.InboundNoEQ(ib.InboundNo)).
				All(ctx0())
			rows = append(rows, row{ib, details})
		}

		ok(w, map[string]any{
			"total":    total,
			"list":     rows,
			"page":     page,
			"pageSize": pageSize,
		})
	}
}

// genBatchNo 生成批次号：日期 + 自增
func genBatchNo(materialCode string) string {
	// TODO: 使用数据库序列或 Redis INCR 保证自增唯一
	// 暂用时间戳 + 随机后缀
	now := nowStr()
	return "B" + now + materialCodeSuffix(materialCode)
}

func nowStr() string {
	// YYYYMMDDHHMMSS
	const layout = "20060102150405"
	return timeNow().Format(layout)
}

func materialCodeSuffix(code string) string {
	if len(code) > 4 {
		code = code[len(code)-4:]
	}
	return code
}