package catalogue

import "strings"

// What the move of config reads of a module's declaration (novox/hq ADR 0348 §9, design 57 K5, issue 664): where a
// layer's key goes, how two layers' values become one, and whether a value is one its declaration takes.

// TakenAs is each name a mergeable file takes a config value under that is not the value's config key, with that
// key (issue 751): a layer set before the module moved may still say the file's name, and the move sets it under
// the config key.
func TakenAs(m Manifest) map[string]string {
	out := map[string]string{}
	for key, as := range renamedTaken(m) {
		out[as] = key
	}
	return out
}

// AskedKeys is every value a placeholder of the module asks for: a file, a unit, a directory's owner, a
// contribution or a served fact. Such a value is taken whole from the last layer that sets it, where a mergeable
// file lays one object over another key by key.
func AskedKeys(m Manifest) map[string]bool { return settingKeysUsedBy(m) }

// LaidOver is a value laid over another as a later layer is laid over an earlier: two objects key by key, anything
// else replaced whole.
func LaidOver(under, over any) any { return mergeValue(under, over) }

// ValueProblems is what is wrong with a value for a declaration: its type, and its enum, bounds or pattern.
func ValueProblems(d SettingDeclaration, v any) []string {
	if v == nil {
		return []string{"no value"}
	}
	d.Default = v
	d.Required = false
	var problems []string
	for _, p := range validationProblems(d) {
		problems = append(problems, strings.ReplaceAll(p, "its default", "the value"))
	}
	return problems
}