242 lines
7.2 KiB
Go
242 lines
7.2 KiB
Go
package pkg
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import (
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"context"
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"fmt"
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"github.com/jackc/pgx/v4"
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"github.com/julienschmidt/httprouter"
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"html/template"
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"math"
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"net/http"
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)
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type ProductEntry struct {
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Slug string
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Name string
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Price string
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}
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type productsIndexPage struct {
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Products []*ProductEntry
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}
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func IndexProducts(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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conn := getConn(r)
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company := mustGetCompany(r)
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page := &productsIndexPage{
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Products: mustGetProductEntries(r.Context(), conn, company),
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}
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mustRenderAppTemplate(w, r, "products/index.gohtml", page)
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}
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func GetProductForm(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
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locale := getLocale(r)
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conn := getConn(r)
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company := mustGetCompany(r)
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form := newProductForm(r.Context(), conn, locale, company)
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slug := params[0].Value
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if slug == "new" {
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w.WriteHeader(http.StatusOK)
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mustRenderNewProductForm(w, r, form)
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return
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}
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var productId int
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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)
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if err != nil {
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if err == pgx.ErrNoRows {
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http.NotFound(w, r)
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return
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} else {
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panic(err)
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}
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}
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rows, err := conn.Query(r.Context(), "select tax_id from product_tax where product_id = $1", productId)
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if err != nil {
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panic(err)
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}
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defer rows.Close()
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for rows.Next() {
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if err := rows.Scan(form.Tax); err != nil {
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panic(err)
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}
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}
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w.WriteHeader(http.StatusOK)
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mustRenderEditProductForm(w, r, form)
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}
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func mustRenderNewProductForm(w http.ResponseWriter, r *http.Request, form *productForm) {
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mustRenderAppTemplate(w, r, "products/new.gohtml", form)
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}
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func mustRenderEditProductForm(w http.ResponseWriter, r *http.Request, form *productForm) {
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mustRenderAppTemplate(w, r, "products/edit.gohtml", form)
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}
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func HandleAddProduct(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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conn := getConn(r)
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locale := getLocale(r)
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company := mustGetCompany(r)
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form := newProductForm(r.Context(), conn, locale, company)
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if err := form.Parse(r); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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if err := verifyCsrfTokenValid(r); err != nil {
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http.Error(w, err.Error(), http.StatusForbidden)
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return
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}
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if !form.Validate() {
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mustRenderNewProductForm(w, r, form)
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return
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}
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tx := conn.MustBegin(r.Context())
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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)
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if len(form.Tax.Selected) > 0 {
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batch := &pgx.Batch{}
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for _, tax := range form.Tax.Selected {
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batch.Queue("insert into product_tax(product_id, tax_id) values ($1, $2)", productId, tax)
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}
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br := tx.SendBatch(r.Context(), batch)
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for range form.Tax.Selected {
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if _, err := br.Exec(); err != nil {
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panic(err)
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}
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}
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if err := br.Close(); err != nil {
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panic(err)
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}
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}
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tx.MustCommit(r.Context())
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http.Redirect(w, r, companyURI(company, "/products"), http.StatusSeeOther)
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}
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func HandleUpdateProduct(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
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conn := getConn(r)
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locale := getLocale(r)
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company := mustGetCompany(r)
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form := newProductForm(r.Context(), conn, locale, company)
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if err := form.Parse(r); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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if err := verifyCsrfTokenValid(r); err != nil {
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http.Error(w, err.Error(), http.StatusForbidden)
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return
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}
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if !form.Validate() {
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w.WriteHeader(http.StatusUnprocessableEntity)
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mustRenderEditProductForm(w, r, form)
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return
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}
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tx := conn.MustBegin(r.Context())
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slug := params[0].Value
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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)
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if productId == 0 {
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tx.MustRollback(r.Context())
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http.NotFound(w, r)
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}
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batch := &pgx.Batch{}
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batch.Queue("delete from product_tax where product_id = $1", productId)
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for _, tax := range form.Tax.Selected {
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batch.Queue("insert into product_tax(product_id, tax_id) values ($1, $2)", productId, tax)
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}
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br := tx.SendBatch(r.Context(), batch)
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for i := 0; i < batch.Len(); i++ {
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if _, err := br.Exec(); err != nil {
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panic(err)
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}
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}
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if err := br.Close(); err != nil {
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panic(err)
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}
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tx.MustCommit(r.Context())
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http.Redirect(w, r, companyURI(company, "/products/"+slug), http.StatusSeeOther)
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}
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func mustGetProductEntries(ctx context.Context, conn *Conn, company *Company) []*ProductEntry {
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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)
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if err != nil {
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panic(err)
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}
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defer rows.Close()
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var entries []*ProductEntry
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for rows.Next() {
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entry := &ProductEntry{}
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err = rows.Scan(&entry.Slug, &entry.Name, &entry.Price)
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if err != nil {
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panic(err)
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}
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entries = append(entries, entry)
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}
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if rows.Err() != nil {
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panic(rows.Err())
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}
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return entries
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}
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type productForm struct {
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locale *Locale
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company *Company
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Name *InputField
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Description *InputField
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Price *InputField
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Tax *SelectField
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}
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func newProductForm(ctx context.Context, conn *Conn, locale *Locale, company *Company) *productForm {
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return &productForm{
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locale: locale,
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company: company,
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Name: &InputField{
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Name: "name",
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Label: pgettext("input", "Name", locale),
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Type: "text",
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Required: true,
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},
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Description: &InputField{
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Name: "description",
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Label: pgettext("input", "Description", locale),
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Type: "textarea",
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},
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Price: &InputField{
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Name: "price",
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Label: pgettext("input", "Price", locale),
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Type: "number",
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Required: true,
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Attributes: []template.HTMLAttr{
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`min="0"`,
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template.HTMLAttr(fmt.Sprintf(`step="%v"`, company.MinCents())),
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},
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},
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Tax: &SelectField{
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Name: "tax",
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Label: pgettext("input", "Taxes", locale),
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Multiple: true,
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Options: mustGetTaxOptions(ctx, conn, company),
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},
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}
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}
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func (form *productForm) Parse(r *http.Request) error {
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if err := r.ParseForm(); err != nil {
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return err
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}
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form.Name.FillValue(r)
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form.Description.FillValue(r)
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form.Price.FillValue(r)
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form.Tax.FillValue(r)
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return nil
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}
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func (form *productForm) Validate() bool {
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validator := newFormValidator()
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validator.CheckRequiredInput(form.Name, gettext("Name can not be empty.", form.locale))
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if validator.CheckRequiredInput(form.Price, gettext("Price can not be empty.", form.locale)) {
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validator.CheckValidDecimal(form.Price, form.company.MinCents(), math.MaxFloat64, gettext("Price must be a number greater than zero.", form.locale))
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}
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validator.CheckValidSelectOption(form.Tax, gettext("Selected tax is not valid.", form.locale))
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return validator.AllOK()
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}
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