<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Services\NavigationTreeService;
use Illuminate\Http\JsonResponse;

class NavigationController extends Controller
{
    protected $navigationService;

    public function __construct(NavigationTreeService $navigationService)
    {
        $this->navigationService = $navigationService;
    }

    /**
     * Gibt den kompletten Navigationsbaum zurück
     * 
     * @return JsonResponse
     */
    public function getNavigationTree(): JsonResponse
    {
        try {
            $tree = $this->navigationService->getNavigationTree();

            return response()->json([
                'success' => true,
                'data' => $tree,
                'meta' => [
                    'total_nodes' => $this->navigationService->countNodes($tree),
                    'generated_at' => now()->toIso8601String()
                ]
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Gibt einen spezifischen Teil des Navigationsbaums zurück
     * 
     * @param int $rootId Die ID des Root-Knotens
     * @return JsonResponse
     */
    public function getNavigationSubTree(int $rootId): JsonResponse
    {
        try {
            $tree = $this->navigationService->getNavigationSubTree($rootId);

            if (!$tree) {
                return response()->json([
                    'success' => false,
                    'error' => 'Navigation node not found'
                ], 404);
            }

            return response()->json([
                'success' => true,
                'data' => $tree,
                'meta' => [
                    'total_nodes' => $this->navigationService->countNodes([$tree]),
                    'generated_at' => now()->toIso8601String()
                ]
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Gibt eine flache Liste aller Navigationspunkte zurück (ohne Hierarchie)
     * 
     * @return JsonResponse
     */
    public function getFlatNavigationList(): JsonResponse
    {
        try {
            $list = $this->navigationService->getFlatNavigationList();

            return response()->json([
                'success' => true,
                'data' => $list,
                'meta' => [
                    'total_nodes' => count($list),
                    'generated_at' => now()->toIso8601String()
                ]
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Gibt nur die aktiven Navigationspunkte zurück
     * 
     * @return JsonResponse
     */
    public function getActiveNavigationTree(): JsonResponse
    {
        try {
            $tree = $this->navigationService->getNavigationTree(true);

            return response()->json([
                'success' => true,
                'data' => $tree,
                'meta' => [
                    'total_nodes' => $this->navigationService->countNodes($tree),
                    'generated_at' => now()->toIso8601String()
                ]
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Gibt den Breadcrumb-Pfad für eine bestimmte Seite zurück
     * 
     * @param int $pageId
     * @return JsonResponse
     */
    public function getBreadcrumb(int $pageId): JsonResponse
    {
        try {
            $breadcrumb = $this->navigationService->getBreadcrumb($pageId);

            if (empty($breadcrumb)) {
                return response()->json([
                    'success' => false,
                    'error' => 'Page not found'
                ], 404);
            }

            return response()->json([
                'success' => true,
                'data' => $breadcrumb,
                'meta' => [
                    'depth' => count($breadcrumb),
                    'generated_at' => now()->toIso8601String()
                ]
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Löscht den Navigation-Cache
     * 
     * @return JsonResponse
     */
    public function clearCache(): JsonResponse
    {
        try {
            $this->navigationService->clearCache();

            return response()->json([
                'success' => true,
                'message' => 'Navigation cache cleared successfully'
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }
}