package handler

import (
	"fmt"
	"net/http"
	"strings"

	"bj_power_wms/ent/inventorybatch"
	"bj_power_wms/ent/material"
	"bj_power_wms/internal/svc"

	"github.com/xuri/excelize/v2"
)

// excelInboundHandler Excel 批量导入入库（结构件）
// 列头(第一行忽略)：物料编码 | 批次号(可空，自动生成) | 数量 | 生产日期 | 供应商 | 区域 | 备注
func excelInboundHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseMultipartForm(20 << 20); err != nil {
			fail(w, http.StatusBadRequest, "文件上传失败: "+err.Error())
			return
		}
		f, _, err := r.FormFile("file")
		if err != nil {
			fail(w, http.StatusBadRequest, "缺少 file 字段")
			return
		}
		defer f.Close()

		xl, err := excelize.OpenReader(f)
		if err != nil {
			fail(w, http.StatusBadRequest, "无法解析 Excel: "+err.Error())
			return
		}
		defer xl.Close()
		sheet := xl.GetSheetList()[0]
		rows, err := xl.GetRows(sheet)
		if err != nil {
			fail(w, http.StatusBadRequest, "读取工作表失败: "+err.Error())
			return
		}

		type resultRow struct {
			Row     int    `json:"row"`
			Code    string `json:"materialCode"`
			BatchNo string `json:"batchNo"`
			Qty     int    `json:"quantity"`
			Error   string `json:"error,omitempty"`
		}
		results := []resultRow{}
		success := 0

		for i, row := range rows {
			if i == 0 {
				continue // 表头
			}
			cell := func(idx int) string {
				if idx < len(row) {
					return strings.TrimSpace(row[idx])
				}
				return ""
			}
			code := cell(0)
			batchNo := cell(1)
			qtyStr := cell(2)
			qty := atoi(qtyStr, 0)
			prodDate := cell(3)
			supplier := cell(4)
			zone := cell(5)
			remark := cell(6)

			res := resultRow{Row: i + 1, Code: code, BatchNo: batchNo, Qty: qty}

			switch {
			case code == "":
				res.Error = "物料编码为空"
			case qty <= 0:
				res.Error = "数量必须大于 0"
			default:
				m, err := ctx.EntClient.Material.Query().
					Where(material.CodeEQ(code)).Only(ctx0())
				if err != nil {
					res.Error = "物料不存在"
				} else if m.ManageMode == 2 {
					res.Error = "精密件请使用 SN 扫码入库，不支持 Excel 导入"
				} else {
					if batchNo == "" {
						batchNo = genBatchNo(code)
					}
					// 同批次追加或新建
					existing, err := ctx.EntClient.InventoryBatch.Query().
						Where(inventorybatch.BatchNoEQ(batchNo)).Only(ctx0())
					if err == nil {
						ctx.EntClient.InventoryBatch.UpdateOneID(existing.ID).
							SetQuantity(existing.Quantity + qty).
							SetNillableSupplier(strPtr(supplier)).
							ExecX(ctx0())
					} else {
						ctx.EntClient.InventoryBatch.Create().
							SetBatchNo(batchNo).
							SetMaterialCode(code).
							SetNillableMaterialName(strPtr(m.Name)).
							SetQuantity(qty).
							SetLockedQty(0).
							SetNillableProductionDate(strPtr(prodDate)).
							SetNillableSupplier(strPtr(supplier)).
							SetQualityStatus("未检").
							SetNillableZoneCode(strPtr(zone)).
							SaveX(ctx0())
					}
					inboundNo := "IB" + nowStr() + fmt.Sprintf("%03d", i)
					ctx.EntClient.InboundOrder.Create().
						SetInboundNo(inboundNo).
						SetNillableInboundType(strPtr("purchase")).
						SetMaterialCode(code).
						SetNillableMaterialName(strPtr(m.Name)).
						SetManageMode(1).
						SetNillableZoneCode(strPtr(zone)).
						SetQuantity(qty).
						SetNillableRemark(strPtr(remark)).
						SetOperator("excel-import").
						SaveX(ctx0())
					res.BatchNo = batchNo
					success++
				}
			}
			results = append(results, res)
		}

		ok(w, map[string]any{"total": len(results), "success": success, "rows": results})
	}
}