package handler

import (
	"net/http"
	"strconv"
	"strings"
	"time"

	"bj_power_wms/ent"
	"bj_power_wms/ent/inventory"
	"bj_power_wms/ent/material"
	"bj_power_wms/ent/ordermaterialledger"
	"bj_power_wms/internal/svc"
)

// 库存品类（与 schema/inventory.go 保持一致）：1=原材料 2=半成品 3=成品
const (
	invCatRaw      = 1
	invCatSemi     = 2
	invCatFinished = 3
)

// 半成品 / 台账 相关（盘点见 stocktake.go）
//
// 【统一库存主表收编 2026-09-07】半成品不再写独立 semi_finisheds 表，
// 全部落 inventories（manage_mode=2 SN单件, category=2 半成品）。
// 三个 semi 接口签名与响应结构保持不变，MES / 前端零改造平滑切换。

// semiInboundHandler 半成品入库（携带已完成工序）
// 与 MES 闭环：MES 工位报工暂存退库时调用本接口，把半成品 SN 入 WMS 库（inventories, category=2）。
// 为保持两系统解耦，materialCode 不强制要求——优先用请求传入，都没有则留空（SN 本身即追溯锚点）。
func semiInboundHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Sn               string `json:"sn"`
			MaterialCode     string `json:"materialCode"`
			DoneProcessCodes []int  `json:"doneProcessCodes"`
			CompletedProcess string `json:"completedProcess"`
			ZoneCode         string `json:"zoneCode"`
			OrderNo          string `json:"orderNo"`
			Operator         string `json:"operator"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		if req.Sn == "" {
			fail(w, http.StatusBadRequest, "sn 必填")
			return
		}

		// SN 防重：同一 SN 只允许一条在库/锁定/出库的库存行（含已出库历史，避免重复回流）
		exists, err := ctx.EntClient.Inventory.Query().
			Where(inventory.CategoryEQ(invCatSemi), inventory.SnCodeEQ(req.Sn)).
			Exist(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		if exists {
			fail(w, http.StatusConflict, "半成品已存在: "+req.Sn)
			return
		}

		// 已完成工序：MES 传 doneProcessCodes([]int) 优先，否则用 completedProcess 字符串
		completed := req.CompletedProcess
		if len(req.DoneProcessCodes) > 0 {
			parts := make([]string, 0, len(req.DoneProcessCodes))
			for _, c := range req.DoneProcessCodes {
				parts = append(parts, strconv.Itoa(c))
			}
			completed = strings.Join(parts, ",")
		}

		// 物料编码：以请求传入为准；名称从物料档案补齐（档案缺失则用编码兜底）
		materialCode := req.MaterialCode
		materialName := materialCode
		if materialCode != "" {
			if m, err := ctx.EntClient.Material.Query().Where(material.CodeEQ(materialCode)).First(ctx0()); err == nil && m != nil {
				materialName = m.Name
			}
		}

		rec, err := ctx.EntClient.Inventory.Create().
			SetManageMode(2).
			SetCategory(invCatSemi).
			SetSnCode(req.Sn).
			SetMaterialCode(materialCode).
			SetMaterialName(materialName).
			SetQuantity(1).
			SetQualityStatus("未检").
			SetNillableZoneCode(strPtr(req.ZoneCode)).
			SetStatus("在库").
			SetNillableInboundNo(strPtr(req.OrderNo)).
			SetOrderNo(req.OrderNo).
			SetCompletedProcess(completed).
			SetRemark("半成品完工暂存回流").
			Save(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}

		ctx.EventLog.Write(ctx0(), "semi.inbound", r.Header.Get("X-Username"), "semi", req.Sn,
			"半成品入库 "+req.Sn, map[string]any{"materialCode": materialCode})
		ok(w, semiView(rec))
	}
}

// semiOutboundHandler 半成品出库（重上线）：更新 inventories 状态
func semiOutboundHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Sn       string `json:"sn"`
			ZoneCode string `json:"zoneCode"`
			Operator string `json:"operator"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		if req.Sn == "" {
			fail(w, http.StatusBadRequest, "sn 必填")
			return
		}

		rec, err := ctx.EntClient.Inventory.Query().
			Where(inventory.CategoryEQ(invCatSemi), inventory.SnCodeEQ(req.Sn)).
			Only(ctx0())
		if err != nil {
			fail(w, http.StatusNotFound, "半成品不存在: "+req.Sn)
			return
		}
		if rec.Status != "在库" {
			fail(w, http.StatusConflict, "半成品不在库: "+rec.Status)
			return
		}

		ctx.EntClient.Inventory.UpdateOneID(rec.ID).
			SetStatus("出库").
			SetUpdatedAt(time.Now().Unix()).
			ExecX(ctx0())

		ctx.EventLog.Write(ctx0(), "semi.outbound", r.Header.Get("X-Username"), "semi", req.Sn,
			"半成品出库(重上线) "+req.Sn, nil)
		ok(w, map[string]any{"sn": req.Sn, "status": "出库"})
	}
}

// semiView 把统一库存行映射为半成品视图（保持原 /api/semi/query 响应结构，前端零改造）
type semiViewRow struct {
	ID               int    `json:"id"`
	Sn               string `json:"sn"`
	MaterialCode     string `json:"materialCode"`
	CompletedProcess string `json:"completedProcess"`
	Quantity         int    `json:"quantity"`
	ZoneCode         string `json:"zoneCode"`
	Status           string `json:"status"`
	OrderNo          string `json:"orderNo"`
	CreatedAt        int64  `json:"createdAt"`
	UpdatedAt        int64  `json:"updatedAt"`
}

func semiView(inv *ent.Inventory) *semiViewRow {
	return &semiViewRow{
		ID:               inv.ID,
		Sn:               inv.SnCode,
		MaterialCode:     inv.MaterialCode,
		CompletedProcess: inv.CompletedProcess,
		Quantity:         inv.Quantity,
		ZoneCode:         inv.ZoneCode,
		Status:           inv.Status,
		OrderNo:          inv.OrderNo,
		CreatedAt:        inv.CreatedAt,
		UpdatedAt:        inv.UpdatedAt,
	}
}

// querySemiHandler 半成品查询（读统一库存主表 category=2）
func querySemiHandler(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")
		status := r.URL.Query().Get("status")

		q := ctx.EntClient.Inventory.Query().Where(inventory.CategoryEQ(invCatSemi))
		if materialCode != "" {
			q = q.Where(inventory.MaterialCodeEqualFold(materialCode))
		}
		if status != "" {
			q = q.Where(inventory.StatusEQ(status))
		}

		total, err := q.Count(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		list, err := q.Order(ent.Desc("created_at"), ent.Desc("id")).
			Offset((page - 1) * pageSize).Limit(pageSize).All(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		rows := make([]*semiViewRow, 0, len(list))
		for _, inv := range list {
			rows = append(rows, semiView(inv))
		}

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

// ledger 相关：queryLedgerHandler 工单物料台账查询
func queryLedgerHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		orderNo := r.URL.Query().Get("orderNo")
		materialCode := r.URL.Query().Get("materialCode")
		materialName := r.URL.Query().Get("materialName")
		status := r.URL.Query().Get("status")
		page := atoi(r.URL.Query().Get("page"), 1)
		pageSize := atoi(r.URL.Query().Get("pageSize"), 20)

		q := ctx.EntClient.OrderMaterialLedger.Query()
		if orderNo != "" {
			q = q.Where(ordermaterialledger.OrderNoEQ(orderNo))
		}
		if materialCode != "" {
			q = q.Where(ordermaterialledger.MaterialCodeEqualFold(materialCode))
		}
		if materialName != "" {
			q = q.Where(ordermaterialledger.MaterialNameContains(materialName))
		}
		if status != "" {
			// 状态枚举：待领料 / 部分领料 由「进行中 + 累计出库数」派生（表内只存 进行中/领料完结）
			// 待领料 = 进行中 且 已出库=0；部分领料 = 进行中 且 已出库>0
			switch status {
			case "待领料":
				q = q.Where(ordermaterialledger.And(
					ordermaterialledger.StatusEQ("进行中"),
					ordermaterialledger.OutQtyEQ(0),
				))
			case "部分领料":
				q = q.Where(ordermaterialledger.And(
					ordermaterialledger.StatusEQ("进行中"),
					ordermaterialledger.OutQtyGT(0),
				))
			case "领料完结":
				q = q.Where(ordermaterialledger.StatusEQ("领料完结"))
			case "进行中": // 兼容旧调用：看全部未完结
				q = q.Where(ordermaterialledger.StatusEQ("进行中"))
			default:
				q = q.Where(ordermaterialledger.StatusEQ(status))
			}
		}
		total, err := q.Count(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		list, err := q.Order(ent.Desc("created_at"), ent.Desc("id")).
			Offset((page - 1) * pageSize).Limit(pageSize).All(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, map[string]any{
			"total":    total,
			"list":     list,
			"page":     page,
			"pageSize": pageSize,
		})
	}
}