package gallery

import (
	"fmt"
	"html/template"
)

// A family page: the family's title is the page's heading; under it
// the family's sentence, the idiom rules where the family is the
// primitives, and its examples listed by name with each one's blurb,
// so every section of the rail has a page of its own and the sequence
// a step to stand on.
const familyBody = `{{define "ds-body-family"}}{{with .Family}}{{if .Blurb}}<p class="ds-lead">{{.Blurb}}</p>
{{end}}{{range .Rules}}<div rst-callout rst-tone="info"><span rst-callout-ic aria-hidden="true">{{icon "info"}}</span><div rst-callout-body><strong>{{.Title}}</strong>
<p>{{.Body}}</p></div></div>
{{end}}<ul class="ds-routes">{{range .Examples}}
<li><a class="rst-mono" data-gallery-nav href="{{$.Href (print .Name ".html")}}">{{.Name}}</a><span>{{index $.Blurbs .Name}}</span></li>{{end}}
</ul>{{end}}{{end}}`

// familyBody renders the body of the family page p is.
func (s *site) familyBody(p page) (template.HTML, error) {
	f, ok := s.familyByKey(p.Kind)
	if !ok {
		return "", fmt.Errorf("no family %s", p.Kind)
	}
	blurbs := map[string]string{}
	for _, e := range f.Examples {
		blurbs[e.Name] = s.proseIn(p.Locale, "examples."+e.Name+".blurb", s.prose.Examples[e.Name].Blurb)
	}
	return s.body(p.Locale, "ds-body-family", struct {
		page
		Family family
		Blurbs map[string]string
	}{p, s.familyIn(p.Locale, f), blurbs})
}

// familyByKey is the family with key, if there is one.
func (s *site) familyByKey(key string) (family, bool) {
	for _, f := range s.families {
		if f.Key == key {
			return f, true
		}
	}
	return family{}, false
}

// familyIn is f with its title, blurb and rules in locale.
func (s *site) familyIn(locale string, f family) family {
	out := f
	out.Title = s.proseIn(locale, "families."+f.Key+".title", f.Title)
	out.Blurb = s.proseIn(locale, "families."+f.Key+".blurb", f.Blurb)
	out.Rules = nil
	for _, r := range f.Rules {
		out.Rules = append(out.Rules, idiomRule{
			Idiom: r.Idiom,
			Title: s.proseIn(locale, "pages.idioms."+r.Idiom+".title", r.Title),
			Body:  s.proseIn(locale, "pages.idioms."+r.Idiom+".body", r.Body),
		})
	}
	return out
}

func init() { registerTemplate(familyBody) }