<?php

namespace Longyi\FrontMenu\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Longyi\FrontMenu\Models\FrontMenuItem;
use Longyi\FrontMenu\Repositories\FrontMenuItemRepository;

class FrontMenuController extends Controller
{
    protected $repository;

    public function __construct(FrontMenuItemRepository $repository)
    {
        $this->repository = $repository;
        $this->_config = request('_config');
    }

    /**
     * Display the menu tree list.
     */
    public function index()
    {
        $menuItems = $this->repository->getMenuTree();

        return view($this->_config['view'], compact('menuItems'));
    }

    /**
     * Show the create form.
     */
    public function create()
    {
        $menuItems = $this->repository->getMenuTree();

        return view($this->_config['view'], compact('menuItems'));
    }

    /**
     * Store a new menu item.
     */
    public function store(Request $request)
    {
        $request->validate([
            'name'       => 'required|string|max:255',
            'slug'       => 'required|string|max:255|unique:front_menu_items,slug',
            'url'        => 'nullable|string|max:2048',
            'image'      => 'nullable|string|max:2048',
            'banner'     => 'nullable|string|max:2048',
            'wap_image'  => 'nullable|string|max:2048',
            'wap_banner' => 'nullable|string|max:2048',
            'show_icon'  => 'nullable|boolean',
            'parent_id'  => 'nullable|exists:front_menu_items,id',
            'sort_order' => 'nullable|integer',
            'status'     => 'nullable|boolean',
        ]);

        $this->repository->create($this->prepareData($request));

        session()->flash('success', __('frontmenu::app.admin.menu.created'));

        return redirect()->route($this->_config['redirect']);
    }

    /**
     * Show the edit form.
     */
    public function edit($id)
    {
        $menuItem = $this->repository->findOrFail($id);
        $menuItems = $this->repository->getMenuTree();

        return view($this->_config['view'], compact('menuItem', 'menuItems'));
    }

    /**
     * Update an existing menu item.
     */
    public function update(Request $request, $id)
    {
        $request->validate([
            'name'       => 'required|string|max:255',
            'slug'       => 'required|string|max:255|unique:front_menu_items,slug,' . $id,
            'url'        => 'nullable|string|max:2048',
            'image'      => 'nullable|string|max:2048',
            'banner'     => 'nullable|string|max:2048',
            'wap_image'  => 'nullable|string|max:2048',
            'wap_banner' => 'nullable|string|max:2048',
            'show_icon'  => 'nullable|boolean',
            'parent_id'  => 'nullable|exists:front_menu_items,id',
            'sort_order' => 'nullable|integer',
            'status'     => 'nullable|boolean',
        ]);

        // Prevent a menu item from becoming its own parent or a descendant's child.
        if ($request->filled('parent_id') && $request->input('parent_id') == $id) {
            session()->flash('error', __('frontmenu::app.admin.menu.self-parent'));

            return redirect()->back()->withInput();
        }

        $this->repository->update($this->prepareData($request), $id);

        session()->flash('success', __('frontmenu::app.admin.menu.updated'));

        return redirect()->route($this->_config['redirect']);
    }

    /**
     * Delete a menu item (and its children via cascade).
     */
    public function destroy($id)
    {
        $menuItem = $this->repository->findOrFail($id);

        $menuItem->delete();

        session()->flash('success', __('frontmenu::app.admin.menu.deleted'));

        return redirect()->route($this->_config['redirect']);
    }

    /**
     * Reorder menu items via drag & drop.
     */
    public function reorder(Request $request)
    {
        $request->validate([
            'items' => 'required|array',
            'items.*.id' => 'required|integer|exists:front_menu_items,id',
        ]);

        $items = $request->input('items', []);

        // Group by parent so each level gets its own sort order sequence.
        $grouped = [];

        foreach ($items as $item) {
            $parentId = $item['parent_id'] ?? null;
            $grouped[$parentId ?? 'root'][] = $item['id'];
        }

        foreach ($grouped as $parentKey => $ids) {
            $parentId = $parentKey === 'root' ? null : $parentKey;

            foreach ($ids as $index => $id) {
                FrontMenuItem::query()->where('id', $id)->update([
                    'parent_id'  => $parentId,
                    'sort_order' => $index,
                ]);
            }
        }

        return response()->json([
            'success' => true,
            'message' => __('frontmenu::app.admin.menu.reordered'),
        ]);
    }

    /**
     * Normalize request data before persisting.
     */
    protected function prepareData(Request $request): array
    {
        $data = $request->only([
            'name',
            'slug',
            'url',
            'image',
            'banner',
            'wap_image',
            'wap_banner',
            'parent_id',
            'sort_order',
        ]);

        $data['parent_id'] = $request->filled('parent_id') ? (int) $request->input('parent_id') : null;
        $data['sort_order'] = $request->input('sort_order', 0);
        $data['status'] = $request->has('status') ? (bool) $request->input('status') : true;
        $data['show_icon'] = $request->has('show_icon') ? (bool) $request->input('show_icon') : false;
        $data['created_by'] = auth()->guard('admin')->user()->id ?? null;

        return $data;
    }
}