package controllers

import (
	"fmt"
	"strings"
	"time"

	"server/models"

	"github.com/beego/beego/v2/client/orm"
)

// BackendErpWarehouseController 仓库档案
type BackendErpWarehouseController struct {
	BackendErpBaseController
}

type erpWarehousePayload struct {
	WarehouseCode string `json:"warehouse_code"`
	WarehouseName string `json:"warehouse_name"`
	Address       string `json:"address"`
	Manager       string `json:"manager"`
	Phone         string `json:"phone"`
	IsDefault     int8   `json:"is_default"`
	Status        *int8  `json:"status"`
	Remark        string `json:"remark"`
}

// List GET /backend/erp/warehouse/list
func (c *BackendErpWarehouseController) List() {
	cl, err := c.claims()
	if c.denied(err) {
		return
	}
	rows, code, msg := erpWarehouseListCore(
		erpNewActor(cl),
		c.GetString("keyword"),
		c.GetString("status"),
		strings.TrimSpace(c.GetString("only_enabled")) == "1",
	)
	if msg != "" {
		c.fail(code, code, msg)
		return
	}
	c.ok(map[string]interface{}{"list": rows})
}

// Detail GET /backend/erp/warehouse/:id
func (c *BackendErpWarehouseController) Detail() {
	cl, err := c.claims()
	if c.denied(err) {
		return
	}
	id := c.pathID()
	var row models.ErpWarehouse
	if err := models.Orm.QueryTable(new(models.ErpWarehouse)).
		Filter("id", id).Filter("tenant_id", c.tid(cl)).
		Filter("delete_time__isnull", true).One(&row); err != nil {
		c.fail(404, 404, "仓库未找到")
		return
	}
	c.ok(row)
}

// Create POST /backend/erp/warehouse
func (c *BackendErpWarehouseController) Create() {
	cl, err := c.claims()
	if c.denied(err) {
		return
	}
	var p erpWarehousePayload
	if !c.bindJSON(&p) {
		return
	}
	if strings.TrimSpace(p.WarehouseName) == "" {
		c.fail(400, 400, "仓库名称不能为空")
		return
	}
	tid := c.tid(cl)
	name := strings.TrimSpace(p.WarehouseName)
	code := strings.TrimSpace(p.WarehouseCode)
	if erpWarehouseFieldTaken(tid, "warehouse_name", name, 0) {
		c.fail(400, 400, "仓库名称「"+name+"」已存在")
		return
	}
	if code != "" && erpWarehouseFieldTaken(tid, "warehouse_code", code, 0) {
		c.fail(400, 400, "仓库编号「"+code+"」已存在")
		return
	}
	now := time.Now()
	row := models.ErpWarehouse{
		TenantID: tid, WarehouseCode: strings.TrimSpace(p.WarehouseCode),
		WarehouseName: strings.TrimSpace(p.WarehouseName), Address: p.Address,
		Manager: p.Manager, Phone: p.Phone, IsDefault: p.IsDefault,
		Status: erpStatusOr(p.Status, 1), Remark: p.Remark,
		CreateTime: now, UpdateTime: now,
	}
	if row.WarehouseCode == "" {
		row.WarehouseCode = fmt.Sprintf("CK%s", now.Format("01021504"))
	}
	id, err := models.Orm.Insert(&row)
	if err != nil {
		c.fail(500, 500, "创建失败: "+err.Error())
		return
	}
	if row.IsDefault == 1 {
		erpClearDefaultWarehouse(tid, uint64(id))
	}
	c.ok(map[string]interface{}{"id": id})
}

// Update PUT /backend/erp/warehouse/:id
func (c *BackendErpWarehouseController) Update() {
	cl, err := c.claims()
	if c.denied(err) {
		return
	}
	id := c.pathID()
	if id == 0 {
		c.fail(400, 400, "无效的ID")
		return
	}
	var p erpWarehousePayload
	if !c.bindJSON(&p) {
		return
	}
	if strings.TrimSpace(p.WarehouseName) == "" {
		c.fail(400, 400, "仓库名称不能为空")
		return
	}
	tid := c.tid(cl)
	var row models.ErpWarehouse
	if err := models.Orm.QueryTable(new(models.ErpWarehouse)).
		Filter("id", id).Filter("tenant_id", tid).
		Filter("delete_time__isnull", true).One(&row); err != nil {
		c.fail(404, 404, "仓库未找到")
		return
	}
	name := strings.TrimSpace(p.WarehouseName)
	code := strings.TrimSpace(p.WarehouseCode)
	if erpWarehouseFieldTaken(tid, "warehouse_name", name, id) {
		c.fail(400, 400, "仓库名称「"+name+"」已存在")
		return
	}
	if code != "" && erpWarehouseFieldTaken(tid, "warehouse_code", code, id) {
		c.fail(400, 400, "仓库编号「"+code+"」已存在")
		return
	}
	if _, err := models.Orm.QueryTable(new(models.ErpWarehouse)).Filter("id", id).
		Update(orm.Params{
			"warehouse_code": strings.TrimSpace(p.WarehouseCode),
			"warehouse_name": strings.TrimSpace(p.WarehouseName),
			"address":        p.Address, "manager": p.Manager, "phone": p.Phone,
			"is_default": p.IsDefault, "status": erpStatusOr(p.Status, row.Status), "remark": p.Remark,
			"update_time": time.Now(),
		}); err != nil {
		c.fail(500, 500, "更新失败: "+err.Error())
		return
	}
	if p.IsDefault == 1 {
		erpClearDefaultWarehouse(tid, id)
	}
	c.ok(nil)
}

// Delete DELETE /backend/erp/warehouse/:id
func (c *BackendErpWarehouseController) Delete() {
	cl, err := c.claims()
	if c.denied(err) {
		return
	}
	id := c.pathID()
	if id == 0 {
		c.fail(400, 400, "无效的ID")
		return
	}
	tid := c.tid(cl)
	var row models.ErpWarehouse
	if err := models.Orm.QueryTable(new(models.ErpWarehouse)).
		Filter("id", id).Filter("tenant_id", tid).
		Filter("delete_time__isnull", true).One(&row); err != nil {
		c.fail(404, 404, "仓库未找到")
		return
	}
	var qty float64
	var stocks []models.ErpStock
	_, _ = models.Orm.QueryTable(new(models.ErpStock)).
		Filter("tenant_id", tid).Filter("warehouse_id", id).All(&stocks, "quantity")
	for _, s := range stocks {
		qty += s.Quantity
	}
	if qty > 0.000001 {
		c.fail(400, 400, "该仓库仍有库存，不能删除，请先调拨出库或停用")
		return
	}
	now := time.Now()
	if _, err := models.Orm.QueryTable(new(models.ErpWarehouse)).Filter("id", id).
		Update(orm.Params{"delete_time": now, "update_time": now}); err != nil {
		c.fail(500, 500, "删除失败: "+err.Error())
		return
	}
	c.ok(nil)
}

// erpStatusOr status 用指针区分「未传」与「显式传 0（停用）」，未传时回落到调用方给的默认值。
func erpStatusOr(v *int8, def int8) int8 {
	if v == nil {
		return def
	}
	return *v
}

// erpWarehouseFieldTaken 仓库名称/编号在租户内是否已被占用（excludeID>0 时排除自身）。
// 名称唯一是硬约束：ERP 基础设置里的默认仓库按名称存储，重名会让设置指向错误的仓。
func erpWarehouseFieldTaken(tid, field, value string, excludeID uint64) bool {
	if strings.TrimSpace(value) == "" {
		return false
	}
	qs := models.Orm.QueryTable(new(models.ErpWarehouse)).
		Filter("tenant_id", tid).Filter("delete_time__isnull", true).
		Filter(field, value)
	if excludeID > 0 {
		qs = qs.Exclude("id", excludeID)
	}
	n, _ := qs.Count()
	return n > 0
}

// erpClearDefaultWarehouse 默认仓库全租户唯一
func erpClearDefaultWarehouse(tid string, keepID uint64) {
	_, _ = models.Orm.QueryTable(new(models.ErpWarehouse)).
		Filter("tenant_id", tid).Filter("is_default", 1).Exclude("id", keepID).
		Update(orm.Params{"is_default": 0, "update_time": time.Now()})
}