ldc-crm/app/Http/Controllers/CustomerController.php

<?php

namespace App\Http\Controllers;

use App\Enums\CustomerExportType;
use App\Http\Requests\CustomerExport;
use App\Models\Brand;
use App\Models\Customer;
use App\Models\CustomerInfo;
use App\Models\CustomerLogin;
use App\Models\SingleOptin;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;
use League\Csv\Writer;
use Symfony\Component\HttpFoundation\StreamedResponse;

class CustomerController extends Controller
{
    public function index()
    {
        $brands = Brand::select('id', 'name')->get();
        $query  = CustomerInfo::with(['customer']);
        if (request()->brand) {
            $query = $query->where('brand_id', request()->brand);
        }
        $customers  = $query->paginate();
        $modelTable = (new Customer())->getTable();
        $modelClass = Customer::class;

        // use a crud controller (any) to gather crudModels
        $modelsClasses = (new BrandController())->getCrudModels();
        return view('customer.index', compact(
            'modelsClasses',
            'modelClass',
            'modelTable',
            'customers',
            'brands'
        ));
    }

    public function show(Customer $customer, Brand $brand)
    {
        $customerInfos = CustomerInfo::where('customer_id', $customer->id)
            ->where('brand_id', $brand->id)->firstOrFail();
        $customerLogin = CustomerLogin::where('customer_id', $customer->id)
            ->where('brand_id', $brand->id)->first();

        // use a crud controller (any) to gather crudModels
        $modelsClasses = (new BrandController())->getCrudModels();
        return view('customer.show', compact(
            'modelsClasses',
            'customerInfos',
            'customerLogin'
        ));
    }

    public function filter($texte, Brand $brand = null)
    {
        if ($brand) {
            $customers = Customer::join('customer_infos', 'customers.id', '=', 'customer_infos.customer_id')
                ->join('customer_logins', 'customers.id', '=', 'customer_logins.customer_id')->select(
                    'customer_infos.customer_id',
                    'customer_infos.firstname',
                    'customer_infos.lastname',
                    'customer_infos.opt_in',
                    'customers.email',
                    'customer_infos.brand_id',
                    'customer_logins.last_connection'
                )->where([
                    ['lastname', 'like', '%' . $texte . '%'],
                ['customer_infos.brand_id', $brand->id],
                ['customer_logins.brand_id', $brand->id]
                ])->orWhere([
                    ['email', 'like', '%' . $texte . '%'],
                ['customer_infos.brand_id', $brand->id],
                ['customer_logins.brand_id', $brand->id]
                ])->get();
        } else {
            $customers = CustomerInfo::join('customers', 'customers.id', '=', 'customer_infos.customer_id')
                ->join('customer_logins', function ($join) {
                    $join->on('customer_logins.customer_id', '=', 'customer_infos.customer_id');
                    $join->on('customer_logins.brand_id', '=', 'customer_infos.brand_id');
                })->select(
                    'customer_infos.customer_id',
                    'customer_infos.firstname',
                    'customer_infos.lastname',
                    'customer_infos.opt_in',
                    'customers.email',
                    'customer_infos.brand_id',
                    'customer_logins.last_connection'
                )->where('lastname', 'like', '%' . $texte . '%')
                ->orWhere('email', 'like', '%' . $texte . '%')->get();
        }

        return response()->json($customers);
    }

    public function delete(Customer $customer, Brand $brand)
    {
        $nbBrand = $customer->infos()->count();

        $customer->infos()->where('brand_id', $brand->id)->delete();
        $customer->logins()->where('brand_id', $brand->id)->delete();
        $customer->optInHistory()->where('brand_id', $brand->id)->delete();

        if ($nbBrand === 1) {
            $customer->delete();
        }

        return redirect()->route('customers.index')->with('success', "Compte supprimé.");
    }

    public function export()
    {
        // use a crud controller (any) to gather crudModels
        $modelsClasses = (new BrandController())->getCrudModels();
        return view('customer.export', compact(
            'modelsClasses'
        ));
    }

    public function exportSubmit(CustomerExport $request)
    {
        $pagination = 2000;
        $header     = '"lastname";"firstname";"email";"hashcode"';

        $w = Writer::createFromString($header . PHP_EOL);
        $w->setDelimiter(';');
        $w->setEnclosure('"');
        $w->setOutputBOM(Writer::BOM_UTF8);

        $exportType = CustomerExportType::make(\intval($request->export_type));

        //We send the CSV using Symfony StreamedResponse
        $response = new StreamedResponse();
        $response->headers->set('Content-Encoding', 'none');
        $response->headers->set('Content-Type', 'text/csv; charset=UTF-8');
        $response->headers->set('Description', 'File Transfer');
        $response->headers->set(
            'Content-Disposition',
            sprintf(
                'attachment; filename=\"Export pour newsletter %s %s.csv\"',
                Carbon::now()->format('d-m-Y_H-i'),
                Str::slug($exportType)
            )
        );

        switch ($exportType) {
            case CustomerExportType::both():
                $continue = true;
                // continue
            case CustomerExportType::customer():
                $i = 0;
                /** @var \Illuminate\Database\Eloquent\Builder $req */
                $req   = CustomerInfo::where('brand_id', $request->brand);
                $total = $req->count();
                $pages = $total / $pagination;
                do {
                    /** @var \Illuminate\Pagination\LengthAwarePaginator $items */
                    $items = $req->with('customer', function ($q) {
                        $q->select(['id', 'email']);
                    })->paginate(
                        $pagination,
                        ['lastname', 'firstname', 'hashcode', 'customer_id'],
                        'page',
                        $i
                    );
                    $items->map(function (CustomerInfo $customerInfo) use ($w) {
                        $w->insertOne([
                            'lastname' => $customerInfo->lastname,
                            'firstname' => $customerInfo->firstname,
                            'email' => $customerInfo->customer->email,
                            'hashcode' => $customerInfo->hashcode
                        ]);
                    });
                } while ($i++ <= $pages);
                if (!isset($continue)) {
                    break;
                }
                // continue
            case CustomerExportType::singleOptin():
                SingleOptin::where('brand_id', $request->brand)->get()
                    ->map(function (SingleOptin $singleOptin) use ($w) {
                        $w->insertOne([
                            'lastname' => '',
                            'firstname' => '',
                            'email' => $singleOptin->email,
                            'hashcode' => ''
                        ]);
                    });
                break;
        }

        //we create a callable to output the CSV in chunk
        //with Symfony StreamResponse you can flush the body content if necessary
        //see Symfony documentation for more information
        $flush_threshold = 1000; //the flush value should depend on your CSV size.
        $response->setCallback(function () use ($w, $flush_threshold) {
            foreach ($w->chunk(1024) as $offset => $chunk) {
                echo $chunk;
                if ($offset % $flush_threshold === 0) {
                    flush();
                }
            }
        });
        return $response;
    }
}