package zddc

import (
	_ "embed"
	"sync"
)

// defaultsBytes is the embedded baseline .zddc — see defaults.zddc.yaml
// for the source-of-truth and a description of its role in the cascade.
//
//go:embed defaults.zddc.yaml
var defaultsBytes []byte

// EmbeddedDefaultsBytes returns the raw embedded defaults YAML.
//
// Surface: the show-defaults CLI subcommand dumps these bytes to
// stdout so operators can copy them into <ZDDC_ROOT>/.zddc and edit.
func EmbeddedDefaultsBytes() []byte {
	out := make([]byte, len(defaultsBytes))
	copy(out, defaultsBytes)
	return out
}

var (
	embeddedDefaultsOnce sync.Once
	embeddedDefaults     ZddcFile
	embeddedDefaultsErr  error
)

// EmbeddedDefaults returns the parsed embedded defaults ZddcFile,
// memoised. Parse errors surface on the first call and are sticky.
//
// The cascade walker (EffectivePolicy) consults this as the bottom-
// most level unless an on-disk .zddc up the chain sets `inherit: false`.
func EmbeddedDefaults() (ZddcFile, error) {
	embeddedDefaultsOnce.Do(func() {
		embeddedDefaults, embeddedDefaultsErr = parseBytes(defaultsBytes)
	})
	return embeddedDefaults, embeddedDefaultsErr
}