import { IFormNavigationService } from './interfaces';
export class FormNavigationService implements IFormNavigationService {
private expandedNodeId: string | null = null;
private selectedOptionIndex = 0;
private nodeIds: string[] = [];
private currentNodeIndex = 0;
// Initialize with node IDs for navigation
setNodeIds(nodeIds: string[]): void {
this.nodeIds = nodeIds;
if (this.currentNodeIndex >= nodeIds.length) {
this.currentNodeIndex = Math.max(0, nodeIds.length - 1);
}
}
// Node navigation
getCurrentNodeId(): string | null {
if (this.expandedNodeId) {
return this.expandedNodeId;
}
if (this.nodeIds.length === 0) {
return null;
}
return this.nodeIds[this.currentNodeIndex] || null;
}
expandNode(nodeId: string): void {
this.expandedNodeId = nodeId;
this.selectedOptionIndex = 0; // Reset selection when expanding
}
collapseNode(): void {
this.expandedNodeId = null;
this.selectedOptionIndex = 0;
}
isNodeExpanded(nodeId: string): boolean {
return this.expandedNodeId === nodeId;
}
// Within-node navigation
getSelectedOptionIndex(): number {
return this.selectedOptionIndex;
}
selectOption(index: number): void {
this.selectedOptionIndex = Math.max(0, index);
}
// Form-level navigation
moveToNextNode(): void {
if (this.expandedNodeId) {
return; // Don't navigate when a node is expanded
}
this.currentNodeIndex = Math.min(this.nodeIds.length - 1, this.currentNodeIndex + 1);
}
moveToPreviousNode(): void {
if (this.expandedNodeId) {
return; // Don't navigate when a node is expanded
}
this.currentNodeIndex = Math.max(0, this.currentNodeIndex - 1);
}
// Helper methods
getCurrentNodeIndex(): number {
return this.currentNodeIndex;
}
setCurrentNodeIndex(index: number): void {
this.currentNodeIndex = Math.max(0, Math.min(index, this.nodeIds.length - 1));
}
isAnyNodeExpanded(): boolean {
return this.expandedNodeId !== null;
}
reset(): void {
this.expandedNodeId = null;
this.selectedOptionIndex = 0;
this.currentNodeIndex = 0;
}
}
