location/app/Http/Controllers/DistrictsController.php

<?php

namespace Modules\Location\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Maatwebsite\Excel\Facades\Excel;
use Modules\Location\Exports\DistrictsExport;
use Modules\Location\Http\Requests\DistrictRequest;
use Modules\Location\Models\City;
use Modules\Location\Models\District;
use Modules\Location\Models\Province;

class DistrictsController extends Controller
{
    public $user;

    public function index(){
        $provinces = Province::all();
        return view('location::districts.index', compact('provinces'));
    }

    public function create(){
        $provinces = Province::all();
        return view('location::districts.create', compact('provinces'));
    }

    public function store(DistrictRequest $request){
        $validate = $request->validated();

        if($validate){
            try{
                $district = District::create($validate);
                return redirect()->route('locations.districts.index')->with('success', 'District created successfully');
            } catch(\Exception $e){
                return redirect()->back()->with('error', 'Failed to create district. '.$e->getMessage());
            }
        }
    }

    public function edit($id){
        $district = District::find($id);
        $provinces = Province::all();
        $cities = City::where('province_code', $district->province_code)->get();
        return view('location::districts.create', compact('district', 'provinces','cities'));
    }

    public function update(DistrictRequest $request, $id){
        $validate = $request->validated();

        if($validate){
            try{
                $district = District::find($id);
                $district->update($validate);
                return redirect()->route('locations.districts.index')->with('success', 'District updated successfully');
            } catch(\Exception $e){
                return redirect()->back()->with('error', 'Failed to update district. '.$e->getMessage());
            }
        }
    }

    public function destroy($id){
        try{
            District::destroy($id);
            echo json_encode(['message' => 'District deleted successfully','success'=>true ]);
        } catch(\Exception $e){
            echo json_encode(['message' => 'Failed to delete District', 'success' => false]);
        }
    }

    public function dataForDatatables(Request $request){
        if (is_null($this->user) || !$this->user->can('provinces.view')) {
            //abort(403, 'Sorry! You are not allowed to view users.');
        }

        // Retrieve data from the database
        $query = District::query();

        // Apply search filter if provided
        if ($request->has('search') && !empty($request->get('search'))) {
            $search = $request->get('search');
            $search = explode('|', $search);
            if(isset($search[0]) &&!empty($search[0])){
                $query->where('province_code',$search[0]);
            }
            if(isset($search[1]) &&!empty($search[1])){
                $query->where('city_code',$search[1]);
            }
            $query->where(function ($q) use ($search) {
                $q->where('code', 'LIKE', "%$search[2]%");
                $q->orWhere('name', 'LIKE', "%$search[2]%");
            });
        }

        // Apply sorting if provided
        if ($request->has('sortOrder') && !empty($request->get('sortOrder'))) {
            $order  = $request->get('sortOrder');
            $column = $request->get('sortField');
            $query->orderBy($column, $order);
        }

        // Get the total count of records
        $totalRecords = $query->count();

        // Apply pagination if provided
        if ($request->has('page') && $request->has('size')) {
            $page   = $request->get('page');
            $size   = $request->get('size');
            $offset = ($page - 1) * $size; // Calculate the offset

            $query->skip($offset)->take($size);
        }

        // Get the filtered count of records
        $filteredRecords = $query->count();

        // Get the data for the current page
        $data = $query->with('city.province')->get();

        // Calculate the page count
        $pageCount = ceil($totalRecords/$request->get('size'));

        // Calculate the current page number
        $currentPage = 0 + 1;

        // Return the response data as a JSON object
        return response()->json([
            'draw'            => $request->get('draw'),
            'recordsTotal'    => $totalRecords,
            'recordsFiltered' => $filteredRecords,
            'pageCount'       => $pageCount,
            'page'            => $currentPage,
            'totalCount'      => $totalRecords,
            'data'            => $data,
        ]);
    }

    public function export(Request $request){
        return Excel::download(new DistrictsExport, 'districts.xlsx');
    }

    public function getDistrictsByCityId($id){
        return response()->json(District::where('city_code', $id)->get());
    }
}