numerus/pkg/products.go

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package pkg
import (
"context"
"fmt"
"github.com/julienschmidt/httprouter"
"html/template"
"math"
"net/http"
"strconv"
)
type ProductEntry struct {
Slug string
Name string
Price string
Tags []string
}
type productsIndexPage struct {
Products []*ProductEntry
}
func IndexProducts(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
conn := getConn(r)
company := mustGetCompany(r)
tag := r.URL.Query().Get("tag")
page := &productsIndexPage{
Products: mustCollectProductEntries(r.Context(), conn, company, tag),
}
mustRenderMainTemplate(w, r, "products/index.gohtml", page)
}
func GetProductForm(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
locale := getLocale(r)
conn := getConn(r)
company := mustGetCompany(r)
form := newProductForm(r.Context(), conn, locale, company)
slug := params[0].Value
if slug == "new" {
w.WriteHeader(http.StatusOK)
mustRenderNewProductForm(w, r, form)
return
}
if !form.MustFillFromDatabase(r.Context(), conn, slug) {
http.NotFound(w, r)
return
}
w.WriteHeader(http.StatusOK)
mustRenderEditProductForm(w, r, form)
}
func mustRenderNewProductForm(w http.ResponseWriter, r *http.Request, form *productForm) {
mustRenderAppTemplate(w, r, "products/new.gohtml", form)
}
func mustRenderEditProductForm(w http.ResponseWriter, r *http.Request, form *productForm) {
mustRenderAppTemplate(w, r, "products/edit.gohtml", form)
}
func HandleAddProduct(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
conn := getConn(r)
locale := getLocale(r)
company := mustGetCompany(r)
form := newProductForm(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
}
if !form.Validate() {
mustRenderNewProductForm(w, r, form)
return
}
taxes := mustSliceAtoi(form.Tax.Selected)
conn.MustExec(r.Context(), "select add_product($1, $2, $3, $4, $5, $6)", company.Id, form.Name, form.Description, form.Price, taxes, form.Tags)
http.Redirect(w, r, companyURI(company, "/products"), http.StatusSeeOther)
}
func sliceAtoi(s []string) ([]int, error) {
var i []int
for _, vs := range s {
vi, err := strconv.Atoi(vs)
if err != nil {
return i, err
}
i = append(i, vi)
}
return i, nil
}
func mustSliceAtoi(s []string) []int {
i, err := sliceAtoi(s)
if err != nil {
panic(err)
}
return i
}
func HandleUpdateProduct(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
conn := getConn(r)
locale := getLocale(r)
company := mustGetCompany(r)
form := newProductForm(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
}
if !form.Validate() {
w.WriteHeader(http.StatusUnprocessableEntity)
mustRenderEditProductForm(w, r, form)
return
}
slug := params[0].Value
taxes := mustSliceAtoi(form.Tax.Selected)
if ok := conn.MustGetBool(r.Context(), "select edit_product($1, $2, $3, $4, $5, $6)", slug, form.Name, form.Description, form.Price, taxes, form.Tags); !ok {
http.NotFound(w, r)
}
http.Redirect(w, r, companyURI(company, "/products/"+slug), http.StatusSeeOther)
}
func mustCollectProductEntries(ctx context.Context, conn *Conn, company *Company, tag string) []*ProductEntry {
rows, err := conn.Query(ctx, `
select product.slug
, product.name
, to_price(price, decimal_digits)
, array_agg(coalesce(tag.name::text, ''))
from product
join company using (company_id)
join currency using (currency_code)
left join product_tag using (product_id)
left join tag using(tag_id)
where product.company_id = $1 and (($2 = '') or (tag.name = $2))
group by product.slug
, product.name
, to_price(price, decimal_digits)
order by name
`, company.Id, tag)
if err != nil {
panic(err)
}
defer rows.Close()
var entries []*ProductEntry
for rows.Next() {
entry := &ProductEntry{}
err = rows.Scan(&entry.Slug, &entry.Name, &entry.Price, &entry.Tags)
if err != nil {
panic(err)
}
entries = append(entries, entry)
}
if rows.Err() != nil {
panic(rows.Err())
}
return entries
}
type productForm struct {
locale *Locale
company *Company
Name *InputField
Description *InputField
Price *InputField
Tax *SelectField
Tags *TagsField
}
func newProductForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *productForm {
return &productForm{
locale: locale,
company: company,
Name: &InputField{
Name: "name",
Label: pgettext("input", "Name", locale),
Type: "text",
Required: true,
},
Description: &InputField{
Name: "description",
Label: pgettext("input", "Description", locale),
Type: "textarea",
},
Price: &InputField{
Name: "price",
Label: pgettext("input", "Price", locale),
Type: "number",
Required: true,
Attributes: []template.HTMLAttr{
`min="0"`,
template.HTMLAttr(fmt.Sprintf(`step="%v"`, company.MinCents())),
},
},
Tax: &SelectField{
Name: "tax",
Label: pgettext("input", "Taxes", locale),
Multiple: true,
Options: mustGetTaxOptions(ctx, conn, company),
},
Tags: &TagsField{
Name: "tags",
Label: pgettext("input", "Tags", locale),
},
}
}
func (form *productForm) Parse(r *http.Request) error {
if err := r.ParseForm(); err != nil {
return err
}
form.Name.FillValue(r)
form.Description.FillValue(r)
form.Price.FillValue(r)
form.Tax.FillValue(r)
form.Tags.FillValue(r)
return nil
}
func (form *productForm) 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))
}
validator.CheckValidSelectOption(form.Tax, gettext("Selected tax is not valid.", form.locale))
validator.CheckAtMostOneOfEachGroup(form.Tax, gettext("You can only select a tax of each class.", form.locale))
return validator.AllOK()
}
func (form *productForm) MustFillFromDatabase(ctx context.Context, conn *Conn, slug string) bool {
return !notFoundErrorOrPanic(conn.QueryRow(ctx, `
select product.name
, product.description
, to_price(price, decimal_digits)
, array_agg(tax_id)
, string_agg(tag.name, ',')
from product
left join product_tax using (product_id)
left join product_tag using (product_id)
left join tag using(company_id, tag_id)
join company using (company_id)
join currency using (currency_code)
where product.slug = $1
group by product_id
, product.name
, product.description
, price
, decimal_digits
`, slug).Scan(
form.Name,
form.Description,
form.Price,
form.Tax,
form.Tags))
}