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package app
import (
"bytes"
"html/template"
"io/fs"
"log"
"strings"
. "git.thomasvoss.com/euro-cash.eu/pkg/try"
"git.thomasvoss.com/euro-cash.eu/pkg/watch"
"git.thomasvoss.com/euro-cash.eu/src/dbx"
"git.thomasvoss.com/euro-cash.eu/src/i18n"
)
type templateData struct {
Debugp bool
Printer i18n.Printer
Printers map[string]i18n.Printer
Code, Type string
Mintages dbx.MintageData
Countries []country
}
var (
notFoundTmpl *template.Template
errorTmpl *template.Template
templates map[string]*template.Template
funcmap = map[string]any{
"ifElse": ifElse,
"locales": i18n.Locales,
"map": templateMakeMap,
"safe": asHTML,
"toUpper": strings.ToUpper,
"tuple": templateMakeTuple,
"makeHeaderWithTranslations": makeHeaderWithTranslations,
}
)
func BuildTemplates(dir fs.FS) {
ents := Try2(fs.ReadDir(dir, "."))
notFoundTmpl = buildTemplate(dir, "-404")
errorTmpl = buildTemplate(dir, "-error")
templates = make(map[string]*template.Template, len(ents))
for _, e := range ents {
name := e.Name()
buildAndSetTemplate(dir, name)
if Debugp {
go watch.FileFS(dir, name, func() {
defer func() {
if p := recover(); p != nil {
log.Print(p)
}
}()
buildAndSetTemplate(dir, name)
log.Printf("Template ‘%s’ updated\n", name)
})
}
}
}
func buildAndSetTemplate(dir fs.FS, name string) {
path := "/"
name = strings.TrimSuffix(name, ".html.tmpl")
switch {
case name[0] == '-':
return
case name != "index":
path += strings.ReplaceAll(name, "-", "/")
}
templates[path] = buildTemplate(dir, name)
}
func buildTemplate(dir fs.FS, name string) *template.Template {
names := [...]string{"-base", "-navbar", name}
for i, s := range names {
names[i] = s + ".html.tmpl"
}
t := template.New("-base.html.tmpl").Funcs(funcmap)
t = t.Funcs(includeIfExists(t))
return template.Must(t.ParseFS(dir, names[:]...))
}
func asHTML(s string) template.HTML {
return template.HTML(s)
}
func templateMakeTuple(args ...any) []any {
return args
}
func templateMakeMap(args ...any) map[string]any {
if len(args)&1 != 0 {
/* TODO: Handle error */
args = args[:len(args)-1]
}
m := make(map[string]any, len(args)/2)
for i := 0; i < len(args); i += 2 {
k, ok := args[i].(string)
if !ok {
/* TODO: Handle error */
continue
}
m[k] = args[i+1]
}
return m
}
func includeIfExists(tmpl *template.Template) template.FuncMap {
return template.FuncMap{
"includeIfExists": func(name string, data any) (template.HTML, error) {
t := tmpl.Lookup(name)
if t == nil {
return "", nil
}
var buf bytes.Buffer
err := t.Execute(&buf, data)
return template.HTML(buf.String()), err
},
}
}
func ifElse(b bool, x, y any) any {
if b {
return x
}
return y
}
func makeHeaderWithTranslations(tag string, text string,
translations ...[]any) template.HTML {
var bob strings.Builder
bob.WriteByte('<')
bob.WriteString(tag)
bob.WriteByte('>')
bob.WriteString(text)
/* TODO: Assert that the pairs are [2]string */
for _, pair := range translations {
if text == pair[1] {
continue
}
bob.WriteString(`<br><span class="translation"`)
if pair[0].(string) != "" {
bob.WriteString(` lang="`)
bob.WriteString(pair[0].(string))
bob.WriteString(`">`)
} else {
bob.WriteByte('>')
}
bob.WriteString(pair[1].(string))
bob.WriteString("</span>")
}
bob.WriteString("</")
bob.WriteString(tag)
bob.WriteByte('>')
return template.HTML(bob.String())
}
func (td templateData) Get(fmt string, args ...map[string]any) template.HTML {
return template.HTML(td.Printer.Get(fmt, args...))
}
func (td templateData) GetN(fmtS, fmtP string, n int, args ...map[string]any) template.HTML {
return template.HTML(td.Printer.GetN(fmtS, fmtP, n, args...))
}
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