numerus/pkg/invoices.go

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package pkg
import (
"context"
"fmt"
"github.com/julienschmidt/httprouter"
"html/template"
"math"
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"net/http"
"strconv"
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"time"
)
type InvoiceEntry struct {
Slug string
Date time.Time
Number string
Total string
CustomerName string
CustomerSlug string
Status string
StatusLabel string
}
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type InvoicesIndexPage struct {
Invoices []*InvoiceEntry
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}
func IndexInvoices(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
page := &InvoicesIndexPage{
Invoices: mustCollectInvoiceEntries(r.Context(), getConn(r), mustGetCompany(r), getLocale(r)),
}
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mustRenderAppTemplate(w, r, "invoices/index.gohtml", page)
}
func mustCollectInvoiceEntries(ctx context.Context, conn *Conn, company *Company, locale *Locale) []*InvoiceEntry {
rows := conn.MustQuery(ctx, "select invoice.slug, invoice_date, invoice_number, contact.business_name, contact.slug, invoice.invoice_status, isi18n.name, to_price(total, decimal_digits) from invoice join contact using (contact_id) join invoice_status_i18n isi18n on invoice.invoice_status = isi18n.invoice_status and isi18n.lang_tag = $2 join invoice_amount using (invoice_id) join currency using (currency_code) where invoice.company_id = $1 order by invoice_date, invoice_number", company.Id, locale.Language.String())
defer rows.Close()
var entries []*InvoiceEntry
for rows.Next() {
entry := &InvoiceEntry{}
if err := rows.Scan(&entry.Slug, &entry.Date, &entry.Number, &entry.CustomerName, &entry.CustomerSlug, &entry.Status, &entry.StatusLabel, &entry.Total); err != nil {
panic(err)
}
entries = append(entries, entry)
}
if rows.Err() != nil {
panic(rows.Err())
}
return entries
}
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func GetInvoiceForm(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(r.Context(), conn, locale, company)
slug := params[0].Value
if slug == "new" {
form.Date.Val = time.Now().Format("2006-01-02")
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceForm(w, r, form)
return
}
invoice := mustGetInvoice(r.Context(), conn, company, slug)
if invoice == nil {
http.NotFound(w, r)
return
}
mustRenderAppTemplate(w, r, "invoices/view.gohtml", invoice)
}
type invoice struct {
Number string
Date time.Time
Invoicer taxDetails
Invoicee taxDetails
Notes string
Products []*invoiceProduct
Subtotal string
Taxes [][]string
Total string
}
type taxDetails struct {
Name string
VATIN string
Address string
City string
PostalCode string
Province string
Email string
Phone string
}
type invoiceProduct struct {
Name string
Description string
Price string
Quantity int
Total string
}
func mustGetInvoice(ctx context.Context, conn *Conn, company *Company, slug string) *invoice {
inv := &invoice{}
var invoiceId int
var decimalDigits int
if notFoundErrorOrPanic(conn.QueryRow(ctx, "select invoice_id, decimal_digits, invoice_number, invoice_date, notes, business_name, vatin, phone, email, address, city, province, postal_code, to_price(subtotal, decimal_digits), to_price(total, decimal_digits) from invoice join contact using (contact_id) join invoice_amount using (invoice_id) join currency using (currency_code) where invoice.slug = $1", slug).Scan(&invoiceId, &decimalDigits, &inv.Number, &inv.Date, &inv.Notes, &inv.Invoicee.Name, &inv.Invoicee.VATIN, &inv.Invoicee.Phone, &inv.Invoicee.Email, &inv.Invoicee.Address, &inv.Invoicee.City, &inv.Invoicee.Province, &inv.Invoicee.PostalCode, &inv.Subtotal, &inv.Total)) {
return nil
}
if err := conn.QueryRow(ctx, "select business_name, vatin, phone, email, address, city, province, postal_code from company where company_id = $1", company.Id).Scan(&inv.Invoicer.Name, &inv.Invoicer.VATIN, &inv.Invoicer.Phone, &inv.Invoicer.Email, &inv.Invoicer.Address, &inv.Invoicer.City, &inv.Invoicer.Province, &inv.Invoicer.PostalCode); err != nil {
panic(err)
}
if err := conn.QueryRow(ctx, "select array_agg(array[name, to_price(amount, $2)]) from invoice_tax_amount join tax using (tax_id) where invoice_id = $1", invoiceId, decimalDigits).Scan(&inv.Taxes); err != nil {
panic(err)
}
rows := conn.MustQuery(ctx, "select name, description, to_price(price, $2), quantity, to_price(round(price * quantity * (1 - discount_rate))::integer, 2) from invoice_product where invoice_id = $1", invoiceId, decimalDigits)
defer rows.Close()
for rows.Next() {
product := &invoiceProduct{}
if err := rows.Scan(&product.Name, &product.Description, &product.Price, &product.Quantity, &product.Total); err != nil {
panic(err)
}
inv.Products = append(inv.Products, product)
}
if rows.Err() != nil {
panic(rows.Err())
}
return inv
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}
type newInvoicePage struct {
Form *invoiceForm
Subtotal string
Taxes [][]string
Total string
}
func newNewInvoicePage(form *invoiceForm, r *http.Request) *newInvoicePage {
page := &newInvoicePage{
Form: form,
}
conn := getConn(r)
company := mustGetCompany(r)
err := conn.QueryRow(r.Context(), "select subtotal, taxes, total from compute_new_invoice_amount($1, $2)", company.Id, NewInvoiceProductArray(form.Products)).Scan(&page.Subtotal, &page.Taxes, &page.Total)
if err != nil {
panic(err)
}
return page
}
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func mustRenderNewInvoiceForm(w http.ResponseWriter, r *http.Request, form *invoiceForm) {
locale := getLocale(r)
form.Customer.EmptyLabel = gettext("Select a customer to bill.", locale)
page := newNewInvoicePage(form, r)
mustRenderAppTemplate(w, r, "invoices/new.gohtml", page)
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}
func mustRenderNewInvoiceProductsForm(w http.ResponseWriter, r *http.Request, form *invoiceForm) {
conn := getConn(r)
company := mustGetCompany(r)
page := newInvoiceProductsPage{
Form: form,
Products: mustGetProductChoices(r.Context(), conn, company),
}
mustRenderAppTemplate(w, r, "invoices/products.gohtml", page)
}
func mustGetProductChoices(ctx context.Context, conn *Conn, company *Company) []*productChoice {
rows := conn.MustQuery(ctx, "select product.product_id, product.name, to_price(price, decimal_digits) from product join company using (company_id) join currency using (currency_code) where company_id = $1 order by name", company.Id)
defer rows.Close()
var choices []*productChoice
for rows.Next() {
entry := &productChoice{}
if err := rows.Scan(&entry.Id, &entry.Name, &entry.Price); err != nil {
panic(err)
}
choices = append(choices, entry)
}
if rows.Err() != nil {
panic(rows.Err())
}
return choices
}
type newInvoiceProductsPage struct {
Form *invoiceForm
Products []*productChoice
}
type productChoice struct {
Id int
Name string
Price string
}
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func HandleAddInvoice(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(r.Context(), conn, locale, company)
if err := form.Parse(r); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if err := verifyCsrfTokenValid(r); err != nil {
http.Error(w, err.Error(), http.StatusForbidden)
return
}
switch r.Form.Get("action") {
case "update":
form.Update()
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceForm(w, r, form)
case "products":
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceProductsForm(w, r, form)
case "add":
if !form.Validate() {
w.WriteHeader(http.StatusUnprocessableEntity)
mustRenderNewInvoiceForm(w, r, form)
return
}
conn.MustExec(r.Context(), "select add_invoice($1, $2, $3, $4, $5, $6)", company.Id, form.Number, form.Date, form.Customer, form.Notes, NewInvoiceProductArray(form.Products))
http.Redirect(w, r, companyURI(company, "/invoices"), http.StatusSeeOther)
default:
http.Error(w, gettext("Invalid action", locale), http.StatusBadRequest)
}
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}
func HandleAddProductsToInvoice(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newInvoiceForm(r.Context(), conn, locale, company)
if err := form.Parse(r); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
index := len(form.Products)
productsId := r.Form["id"]
rows := conn.MustQuery(r.Context(), "select product_id, name, description, to_price(price, decimal_digits), 1 as quantity, 0 as discount, array_remove(array_agg(tax_id), null) from product join company using (company_id) join currency using (currency_code) left join product_tax using (product_id) where product_id = any ($1) group by product_id, name, description, price, decimal_digits", productsId)
defer rows.Close()
for rows.Next() {
product := newInvoiceProductForm(index, company, locale, form.Tax.Options)
if err := rows.Scan(product.ProductId, product.Name, product.Description, product.Price, product.Quantity, product.Discount, product.Tax); err != nil {
panic(err)
}
form.Products = append(form.Products, product)
index++
}
if rows.Err() != nil {
panic(rows.Err())
}
w.WriteHeader(http.StatusOK)
mustRenderNewInvoiceForm(w, r, form)
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}
type invoiceForm struct {
locale *Locale
company *Company
Customer *SelectField
Number *InputField
Date *InputField
Notes *InputField
Tax *SelectField
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Products []*invoiceProductForm
}
func newInvoiceForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *invoiceForm {
return &invoiceForm{
locale: locale,
company: company,
Customer: &SelectField{
Name: "customer",
Label: pgettext("input", "Customer", locale),
Required: true,
Options: MustGetOptions(ctx, conn, "select contact_id::text, business_name from contact where company_id = $1 order by business_name", company.Id),
},
Number: &InputField{
Name: "number",
Label: pgettext("input", "Number", locale),
Type: "text",
Required: false,
},
Date: &InputField{
Name: "date",
Label: pgettext("input", "Invoice Date", locale),
Type: "date",
Required: true,
},
Notes: &InputField{
Name: "description",
Label: pgettext("input", "Notes", locale),
Type: "textarea",
},
Tax: &SelectField{
Name: "text",
Label: pgettext("input", "Taxes", locale),
Multiple: true,
Options: mustGetTaxOptions(ctx, conn, company),
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},
}
}
func (form *invoiceForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.Customer.FillValue(r)
form.Number.FillValue(r)
form.Date.FillValue(r)
form.Notes.FillValue(r)
if _, ok := r.Form["product.id.0"]; ok {
for index := 0; true; index++ {
if _, ok := r.Form["product.id."+strconv.Itoa(index)]; !ok {
break
}
productForm := newInvoiceProductForm(index, form.company, form.locale, form.Tax.Options)
if err := productForm.Parse(r); err != nil {
return err
}
form.Products = append(form.Products, productForm)
}
}
return nil
}
func (form *invoiceForm) Validate() bool {
validator := newFormValidator()
validator.CheckValidSelectOption(form.Customer, gettext("Name can not be empty.", form.locale))
if validator.CheckRequiredInput(form.Date, gettext("Invoice date can not be empty.", form.locale)) {
validator.CheckValidDate(form.Date, gettext("Invoice date must be a valid date.", form.locale))
}
validator.CheckValidSelectOption(form.Tax, gettext("Selected tax is not valid.", form.locale))
allOK := validator.AllOK()
for _, product := range form.Products {
allOK = product.Validate() && allOK
}
return allOK
}
func (form *invoiceForm) Update() {
products := form.Products
form.Products = nil
for n, product := range products {
if product.Quantity.Val != "0" {
if n != len(form.Products) {
product.Reindex(len(form.Products))
}
form.Products = append(form.Products, product)
}
}
}
func mustGetTaxOptions(ctx context.Context, conn *Conn, company *Company) []*SelectOption {
return MustGetOptions(ctx, conn, "select tax_id::text, name from tax where company_id = $1 order by name", company.Id)
}
type invoiceProductForm struct {
locale *Locale
company *Company
ProductId *InputField
Name *InputField
Description *InputField
Price *InputField
Quantity *InputField
Discount *InputField
Tax *SelectField
}
func newInvoiceProductForm(index int, company *Company, locale *Locale, taxOptions []*SelectOption) *invoiceProductForm {
form := &invoiceProductForm{
locale: locale,
company: company,
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ProductId: &InputField{
Label: pgettext("input", "Id", locale),
Type: "hidden",
Required: true,
},
Name: &InputField{
Label: pgettext("input", "Name", locale),
Type: "text",
Required: true,
},
Description: &InputField{
Label: pgettext("input", "Description", locale),
Type: "textarea",
},
Price: &InputField{
Label: pgettext("input", "Price", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
`min="0"`,
template.HTMLAttr(fmt.Sprintf(`step="%v"`, company.MinCents())),
},
},
Quantity: &InputField{
Label: pgettext("input", "Quantity", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
`min="0"`,
},
},
Discount: &InputField{
Label: pgettext("input", "Discount (%)", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
`min="0"`,
`max="100"`,
},
},
Tax: &SelectField{
Label: pgettext("input", "Taxes", locale),
Multiple: true,
Options: taxOptions,
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},
}
form.Reindex(index)
return form
}
func (form *invoiceProductForm) Reindex(index int) {
suffix := "." + strconv.Itoa(index)
form.ProductId.Name = "product.id" + suffix
form.Name.Name = "product.name" + suffix
form.Description.Name = "product.description" + suffix
form.Price.Name = "product.price" + suffix
form.Quantity.Name = "product.quantity" + suffix
form.Discount.Name = "product.discount" + suffix
form.Tax.Name = "product.tax" + suffix
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}
func (form *invoiceProductForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.ProductId.FillValue(r)
form.Name.FillValue(r)
form.Description.FillValue(r)
form.Price.FillValue(r)
form.Quantity.FillValue(r)
form.Discount.FillValue(r)
form.Tax.FillValue(r)
return nil
}
func (form *invoiceProductForm) Validate() bool {
validator := newFormValidator()
validator.CheckRequiredInput(form.Name, gettext("Name can not be empty.", form.locale))
if validator.CheckRequiredInput(form.Price, gettext("Price can not be empty.", form.locale)) {
validator.CheckValidDecimal(form.Price, form.company.MinCents(), math.MaxFloat64, gettext("Price must be a number greater than zero.", form.locale))
}
if validator.CheckRequiredInput(form.Quantity, gettext("Quantity can not be empty.", form.locale)) {
validator.CheckValidInteger(form.Quantity, 1, math.MaxInt32, gettext("Quantity must be a number greater than zero.", form.locale))
}
if validator.CheckRequiredInput(form.Discount, gettext("Discount can not be empty.", form.locale)) {
validator.CheckValidInteger(form.Discount, 0, 100, gettext("Discount must be a percentage between 0 and 100.", form.locale))
}
validator.CheckValidSelectOption(form.Tax, gettext("Selected tax is not valid.", form.locale))
return validator.AllOK()
}