Restructure project

internal/controller/table.go

@@ -0,0 +1,74 @@
+package controller
+
+import (
+	"fmt"
+
+	"gitlab.unjx.de/flohoss/cafe-plaetschwiesle/internal/types"
+	"gorm.io/plugin/soft_delete"
+)
+
+type Table struct {
+	ID         uint64                `gorm:"primaryKey" json:"id" validate:"optional"`
+	OrderCount uint64                `json:"order_count" validate:"required"`
+	Total      float32               `json:"total" validate:"required"`
+	UpdatedAt  int64                 `json:"updated_at" validate:"optional"`
+	IsDeleted  soft_delete.DeletedAt `gorm:"softDelete:flag" json:"is_deleted" swaggerignore:"true"`
+}
+
+func (c *Controller) GetAllTables() []Table {
+	var tables []Table
+	c.orm.Model(
+		&Table{},
+	).Joins(
+		"left join orders on tables.id = orders.table_id",
+	).Joins(
+		"left join order_items on orders.order_item_id = order_items.id",
+	).Select(
+		"tables.id, tables.updated_at, sum(order_items.price) as total, count(orders.id) as order_count",
+	).Group(
+		"tables.id",
+	).Order("tables.id").Find(&tables)
+	return tables
+}
+
+func (c *Controller) CreateNewTable() (Table, error) {
+	var table Table
+	var err error
+	result := c.orm.Unscoped().Where("is_deleted = ?", 1).Limit(1).Find(&table)
+	if result.RowsAffected == 0 {
+		err = c.orm.Create(&table).Error
+	} else {
+		table.IsDeleted = 0
+		err = c.orm.Unscoped().Save(&table).Error
+	}
+	if err != nil {
+		return table, fmt.Errorf(types.CannotCreate.String())
+	}
+	return table, nil
+}
+
+func (c *Controller) DeleteLatestTable() error {
+	var table Table
+	err := c.orm.Model(
+		&Table{},
+	).Joins(
+		"left join orders on tables.id = orders.table_id",
+	).Joins(
+		"left join order_items on orders.order_item_id = order_items.id",
+	).Select(
+		"tables.id, count(orders.id) as order_count",
+	).Group(
+		"tables.id",
+	).Last(&table).Error
+	if err != nil {
+		return fmt.Errorf(types.CannotFind.String())
+	}
+	if table.OrderCount != 0 {
+		return fmt.Errorf(types.StillInUse.String())
+	}
+	err = c.orm.Delete(&table).Error
+	if err != nil {
+		return fmt.Errorf(types.CannotDelete.String())
+	}
+	return nil
+}