package engine

import "gitea.maximumdirect.net/eric/ConfigKit/internal/document"

func containsInheritanceDirective(root *document.Node) bool {
	found := false
	walkDocument(root, Path{}, func(path Path, _ *document.Node) {
		if len(path.segments) != 0 && path.segments[len(path.segments)-1].kind == pathSegmentKey &&
			path.segments[len(path.segments)-1].key == inheritanceKey {
			found = true
		}
	})
	return found
}

func inheritanceVersionDiagnostic(rule *VersionRule, expanded *inheritanceScope) *Diagnostic {
	if rule == nil || expanded == nil {
		return nil
	}
	for _, operation := range expanded.operations {
		var location Location
		var affected bool
		if operation.control != nil {
			affected = pathsIntersect(operation.control.path, rule.Path)
			if len(operation.control.locations) != 0 {
				location = operation.control.locations[0]
			}
		} else if operation.transfer != nil {
			if relative, within := relativeHistoryPath(operation.transfer.to, rule.Path); within {
				_, affected = documentAtPath(operation.parent, relative)
			} else if pathContains(rule.Path, operation.transfer.to) {
				affected = true
			}
			if len(operation.transfer.locations) != 0 {
				location = operation.transfer.locations[0]
			}
		}
		if affected {
			return &Diagnostic{
				Code: CodeInheritanceVersion, Severity: SeverityError, Path: rule.Path.clone(),
				Message: "inheritance cannot change the schema-version path", Primary: &location,
			}
		}
	}
	return nil
}

func inheritanceOperations(expanded *inheritanceScope) []inheritanceOperation {
	if expanded == nil {
		return nil
	}
	return expanded.operations
}