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/* openbills - Server for web based Libre Billing Software
* Copyright (C) 2023 Vidhu Kant Sharma <vidhukant@vidhukant.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package invoice
import (
e "vidhukant.com/openbills/errors"
)
// returns greatest invoice number + 1
func getNewInvoiceNumber(userId uint) (uint, error) {
var i uint
// check if number of invoices is 0
var count int64
err := db.Model(&Invoice{}).
Where("user_id = ?", userId).
Count(&count).
Error
if err != nil {
return i, err
}
// if no records exist, then invoice number should be 1
if count == 0 {
return 1, nil
}
// if records exist, get max invoice number
// NOTE: if there are gaps in invoice numbers,
// they won't be filled and the series would continue
// from the greatest invoice number.
row := db.Model(&Invoice{}).Where("user_id = ?", userId).Select("max(invoice_number)").Row()
err = row.Scan(&i)
return i + 1, err
}
func getInvoice(invoice *Invoice, id uint) error {
res := db.Preload("BillingAddress").Preload("ShippingAddress").Preload("Items").Find(&invoice, id)
// TODO: handle potential errors
if res.Error != nil {
return res.Error
}
if res.RowsAffected == 0 {
return e.ErrNotFound
}
return nil
}
func getInvoices(invoices *[]Invoice, userId uint, isDraft bool) error {
res := db.Where("user_id = ? and is_draft = ?", userId, isDraft).Find(&invoices)
// TODO: handle potential errors
if res.Error != nil {
return res.Error
}
if res.RowsAffected == 0 {
return e.ErrEmptyResponse
}
return nil
}
func getInvoiceItems(items *[]InvoiceItem, invoiceId uint) error {
res := db.Where("invoice_id = ?", invoiceId).Find(&items)
// TODO: handle potential errors
if res.Error != nil {
return res.Error
}
if res.RowsAffected == 0 {
return e.ErrEmptyResponse
}
return nil
}
// TODO: route to only get the invouce's items
func (i *Invoice) upsert() error {
res := db.Save(i)
// TODO: handle potential errors
return res.Error
}
func (i *Invoice) del() error {
res := db.Where("id = ? and user_id = ?", i.ID, i.UserID).Delete(i)
// TODO: handle potential errors
if res.Error != nil {
return res.Error
}
// returns 404 if either row doesn't exist or if the user doesn't own it
if res.RowsAffected == 0 {
return e.ErrNotFound
}
return nil
}
// also checks for ownership
func getItemInvoice(itemId, userId uint) (uint, error) {
var invoiceId uint
res := db.
Model(&InvoiceItem{}).
Select("invoice_id").
Where("id = ?", itemId).
Find(&invoiceId)
// TODO: handle potential errors
if res.Error != nil {
return invoiceId, res.Error
}
if res.RowsAffected == 0 {
return invoiceId, e.ErrNotFound
}
err := checkInvoiceOwnership(invoiceId, userId)
if err != nil {
return invoiceId, err
}
return invoiceId, nil
}
func (i *InvoiceItem) del() error {
res := db.Delete(i)
// TODO: handle potential errors
if res.Error != nil {
return res.Error
}
// returns 404 if either row doesn't exist or if the user doesn't own it
if res.RowsAffected == 0 {
return e.ErrNotFound
}
return nil
}
func (i *InvoiceItem) upsert() error {
res := db.Save(i)
// TODO: handle potential errors
return res.Error
}
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