numerus/pkg/products.go

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package pkg
import (
"context"
"fmt"
"github.com/jackc/pgx/v4"
"github.com/julienschmidt/httprouter"
"html/template"
"math"
"net/http"
)
type ProductEntry struct {
Slug string
Name string
Price string
}
type productsIndexPage struct {
Products []*ProductEntry
}
func IndexProducts(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
conn := getConn(r)
company := mustGetCompany(r)
page := &productsIndexPage{
Products: mustGetProductEntries(r.Context(), conn, company),
}
mustRenderAppTemplate(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
}
var productId int
err := conn.QueryRow(r.Context(), "select product_id, product.name, product.description, to_price(price, decimal_digits) from product join company using (company_id) join currency using (currency_code) where product.slug = $1", slug).Scan(&productId, form.Name, form.Description, form.Price)
if err != nil {
if err == pgx.ErrNoRows {
http.NotFound(w, r)
return
} else {
panic(err)
}
}
rows, err := conn.Query(r.Context(), "select tax_id from product_tax where product_id = $1", productId)
if err != nil {
panic(err)
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(form.Tax); err != nil {
panic(err)
}
}
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
}
tx := conn.MustBegin(r.Context())
productId := tx.MustGetInteger(r.Context(), "insert into product (company_id, name, description, price) select company_id, $2, $3, parse_price($4, decimal_digits) from company join currency using (currency_code) where company_id = $1 returning product_id", company.Id, form.Name, form.Description, form.Price)
if len(form.Tax.Selected) > 0 {
batch := &pgx.Batch{}
for _, tax := range form.Tax.Selected {
batch.Queue("insert into product_tax(product_id, tax_id) values ($1, $2)", productId, tax)
}
br := tx.SendBatch(r.Context(), batch)
for range form.Tax.Selected {
if _, err := br.Exec(); err != nil {
panic(err)
}
}
if err := br.Close(); err != nil {
panic(err)
}
}
tx.MustCommit(r.Context())
http.Redirect(w, r, companyURI(company, "/products"), http.StatusSeeOther)
}
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() {
mustRenderEditProductForm(w, r, form)
return
}
tx := conn.MustBegin(r.Context())
slug := params[0].Value
productId := tx.MustGetIntegerOrDefault(r.Context(), 0, "update product set name = $1, description = $2, price = parse_price($3, decimal_digits) from company join currency using (currency_code) where product.company_id = company.company_id and product.slug = $4 returning product_id", form.Name, form.Description, form.Price, slug)
if productId == 0 {
tx.MustRollback(r.Context())
http.NotFound(w, r)
}
batch := &pgx.Batch{}
batch.Queue("delete from product_tax where product_id = $1", productId)
for _, tax := range form.Tax.Selected {
batch.Queue("insert into product_tax(product_id, tax_id) values ($1, $2)", productId, tax)
}
br := tx.SendBatch(r.Context(), batch)
for i := 0; i < batch.Len(); i++ {
if _, err := br.Exec(); err != nil {
panic(err)
}
}
if err := br.Close(); err != nil {
panic(err)
}
tx.MustCommit(r.Context())
http.Redirect(w, r, companyURI(company, "/products/"+slug), http.StatusSeeOther)
}
func mustGetProductEntries(ctx context.Context, conn *Conn, company *Company) []*ProductEntry {
rows, err := conn.Query(ctx, "select product.slug, 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)
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)
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
}
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: MustGetOptions(ctx, conn, "select tax_id::text, name from tax where company_id = $1 order by name", company.Id),
},
}
}
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)
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))
return validator.AllOK()
}