<?php

namespace App\Http\Controllers;

use App\Models\AppMenu;
use Illuminate\Http\Request;

class MenuController extends Controller
{
    /**
     * GET /api/menus
     * List all menus hierarchically
     */
    public function index(Request $request)
    {
        // Fetch all active menus ordered by 'order'
        $menus = AppMenu::where('is_active', true)
            ->orderBy('order', 'asc')
            ->get();

        // If 'flat' param provided, return as flat list (for permission checkboxes)
        if ($request->has('flat')) {
            return response()->json(['success' => true, 'menus' => $menus]);
        }

        // Build Hierarchy (Parent -> Children)
        $hierarchy = $this->buildTree($menus);

        return response()->json([
            'success' => true,
            'menus' => $hierarchy
        ]);
    }

    /**
     * POST /api/menus
     * Create new menu
     */
    public function store(Request $request)
    {
        // Usually restricted to Super Admin
        $validated = $request->validate([
            'label' => 'required|string',
            'key' => 'required|string|unique:app_menus,key',
            'icon' => 'nullable|string',
            'route' => 'nullable|string',
            'parent_id' => 'nullable|string',
            'order' => 'integer',
        ]);

        $menu = AppMenu::create(array_merge($validated, ['is_active' => true]));

        return response()->json(['success' => true, 'menu' => $menu]);
    }

    /**
     * PUT /api/menus/{id}
     */
    public function update(Request $request, $id)
    {
        $menu = AppMenu::find($id);
        if (!$menu)
            return response()->json(['success' => false, 'message' => 'Not found'], 404);

        $menu->update($request->all());
        return response()->json(['success' => true, 'menu' => $menu]);
    }

    /**
     * DELETE /api/menus/{id}
     */
    public function destroy($id)
    {
        $menu = AppMenu::find($id);
        if (!$menu)
            return response()->json(['success' => false, 'message' => 'Not found'], 404);

        $menu->delete();
        return response()->json(['success' => true, 'message' => 'Deleted']);
    }

    // Helper to build tree
    private function buildTree($elements, $parentId = null)
    {
        $branch = [];
        foreach ($elements as $element) {
            if ($element->parent_id == $parentId) {
                $children = $this->buildTree($elements, $element->id);
                if ($children) {
                    $element->children = $children;
                }
                $branch[] = $element;
            }
        }
        return $branch;
    }
}