package handler

import (
	"net/http"
	"strings"

	"bj_power_wms/ent"
	"bj_power_wms/ent/inboundorder"
	"bj_power_wms/ent/inventory"
	"bj_power_wms/internal/svc"
)

// lastInboundLocationHandler 入库库位联动：返回该物料最近一次入库的库位（区域/货架/层/位置号）。
// 前端在「选物料」后自动回填到入库表单（可手动修改），替代原「推荐库位」按钮式交互。
func lastInboundLocationHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		materialCode := strings.TrimSpace(r.URL.Query().Get("materialCode"))
		if materialCode == "" {
			fail(w, http.StatusBadRequest, "materialCode 必填")
			return
		}
		ib, err := ctx.EntClient.InboundOrder.Query().
			Where(inboundorder.MaterialCodeEQ(materialCode)).
			Order(ent.Desc("created_at"), ent.Desc("id")).
			First(ctx0())
		if err != nil {
			if ent.IsNotFound(err) {
				ok(w, map[string]any{"zoneCode": "", "shelfNo": "", "layerNo": "", "positionNo": ""})
				return
			}
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, map[string]any{
			"zoneCode":   ib.ZoneCode,
			"shelfNo":    ib.ShelfNo,
			"layerNo":    ib.LayerNo,
			"positionNo": ib.PositionNo,
		})
	}
}

// outboundLocationHintHandler 出库库位联动（客户诉求 一.9「出库相同」）。
// 取值优先级：① 指定批次在库的实际四级库位（最准，出库就是从该货位取货）
// ② 该物料最近一次入库的库位（历史常用库位）③ 均无则返回空，前端可继续走同区空位推荐。
func outboundLocationHintHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		materialCode := strings.TrimSpace(r.URL.Query().Get("materialCode"))
		batchNo := strings.TrimSpace(r.URL.Query().Get("batchNo"))
		emptyHint := map[string]any{"zoneCode": "", "shelfNo": "", "layerNo": "", "positionNo": ""}
		if materialCode == "" && batchNo == "" {
			ok(w, emptyHint)
			return
		}
		if batchNo != "" {
			if b, err := ctx.EntClient.Inventory.Query().
				Where(inventory.ManageModeEQ(1), inventory.BatchNoEQ(batchNo)).
				Only(ctx0()); err == nil {
				ok(w, map[string]any{
					"zoneCode":   b.ZoneCode,
					"shelfNo":    b.ShelfNo,
					"layerNo":    b.LayerNo,
					"positionNo": b.PositionNo,
				})
				return
			}
		}
		if materialCode == "" {
			ok(w, emptyHint)
			return
		}
		ib, err := ctx.EntClient.InboundOrder.Query().
			Where(inboundorder.MaterialCodeEQ(materialCode)).
			Order(ent.Desc("created_at"), ent.Desc("id")).
			First(ctx0())
		if err != nil {
			ok(w, emptyHint)
			return
		}
		ok(w, map[string]any{
			"zoneCode":   ib.ZoneCode,
			"shelfNo":    ib.ShelfNo,
			"layerNo":    ib.LayerNo,
			"positionNo": ib.PositionNo,
		})
	}
}