import config from "@/lib/listPermission.json";

export interface PermissionNode {
   key: string;
   label: string;
   children?: PermissionNode[];
}

interface Grouped {
   [key: string]: {
      label: string;
      children: Grouped;
      actions: string[];
   };
}

/* --- Build lookup table --- */
const permissionMap: Record<string, string[]> = {};

function walk(nodes: PermissionNode[], path: string[] = []) {
   nodes.forEach((n) => {
      const full = [...path, n.label];
      permissionMap[n.key] = full;
      if (n.children) walk(n.children, full);
   });
}

walk(config.menus);

/* --- Convert keys → hierarchical grouped --- */
export function groupPermissions(keys: string[]) {
   const tree: Grouped = {};

   keys.forEach((key) => {
      const path = permissionMap[key];
      if (!path) return;

      let pointer = tree;

      path.forEach((label, idx) => {
         if (!pointer[label]) {
            pointer[label] = {
               label,
               children: {},
               actions: []
            };
         }

         // last item = actual permission action
         if (idx === path.length - 1) {
            pointer[label].actions.push(label);
         }

         pointer = pointer[label].children;
      });
   });

   return tree;
}