package fiesta

import (
	_ "embed"
	"encoding/json"
	"maps"
	"sync"
)

// Source says where one example state came from when the examples were
// seeded: the kind of thing it was in the gallery it was taken from (a
// partial, an idiom, a shell, a format or a screen), that thing's name,
// which of its states, the locale it was rendered in, and, for a shell,
// which view of it (index or page). A server whose templates render the
// same parts can hold its output to the example a Source names.
type Source struct {
	Kind   string `json:"kind"`
	Source string `json:"source"`
	State  int    `json:"state"`
	Locale string `json:"locale"`
	View   string `json:"view,omitempty"`
}

// sourcesJSON is the seed's record, kept where the seeding wrote it.
//
//go:embed hack/seed/sources.json
var sourcesJSON []byte

// sources is sourcesJSON read once. The file is embedded, so a record
// that does not read is a broken build rather than a condition to
// report: the panic says so.
var sources = sync.OnceValue(func() map[string]Source {
	var out map[string]Source
	if err := json.Unmarshal(sourcesJSON, &out); err != nil {
		panic("fiesta: hack/seed/sources.json does not read: " + err.Error())
	}
	return out
})

// Sources returns where every seeded example state came from, keyed by
// its path under examples/ without the .html: "badge/positive" for
// examples/badge/positive.html. The returned map is a copy, so a caller
// that edits it cannot change the next caller's.
func Sources() map[string]Source { return maps.Clone(sources()) }