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package syw

import (
	"embed"
	"net/url"
	"text/template"
)

var (
	//go:embed templates/*.gmi
	geminiTemplateFS embed.FS
	geminiTemplate   = template.Must(template.ParseFS(geminiTemplateFS, "templates/*.gmi"))
)

var (
	//go:embed templates/*.gophermap templates/*.gophertext
	gopherTemplateFS embed.FS
	gopherTemplate   = template.Must(
		template.New("gopher").Funcs(template.FuncMap{
			"combine": gopherCombine,
			"join": gopherJoin,
		}).ParseFS(
			gopherTemplateFS,
			"templates/*.gophermap",
			"templates/*.gophertext",
		),
	)
)

func gopherCombine(base string, relative ...string) (string, error) {
	bu, err := url.Parse(base)
	if err != nil {
		return "", err
	}

	for _, rel := range relative {
		ru, err := url.Parse(rel)
		if err != nil {
			return "", err
		}
		bu = bu.ResolveReference(ru)
	}

	return bu.String(), nil
}

func gopherJoin(base string, relative ...string) (string, error) {
	bu, err := url.Parse(base)
	if err != nil {
		return "", err
	}

	return bu.JoinPath(relative...).Path, nil
}

func addTemplates(base *template.Template, additions *template.Template) (*template.Template, error) {
	base, err := base.Clone()
	if err != nil {
		return nil, err
	}
	if additions == nil {
		return base, nil
	}

	for _, addition := range additions.Templates() {
		if _, err := base.AddParseTree(addition.Name(), addition.Tree); err != nil {
			return nil, err
		}
	}

	return base, nil
}