<?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\Database\Query\JoinClause;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\Session;
use Illuminate\Support\Facades\View;
use Illuminate\Support\Str;
use League\Csv\Writer;
use Symfony\Component\HttpFoundation\StreamedResponse;

/**
 * @codeCoverageIgnore
 */
class CustomerController extends Controller
{
    /**
     * View share crud policies modelClass
     */
    public function __construct()
    {
        $this->middleware(function ($request, $next) {
            View::share('modelClass', Customer::class);
            return $next($request);
        });
    }

    /**
     * View all customers
     *
     * @param Request $request
     * @return \Illuminate\Http\Response
     */
    public function index(Request $request)
    {
        $modelTable = (new Customer())->getTable();
        $modelClass = Customer::class;
        $brands     = Brand::select('id', 'name')->get();
        $columns    = ['customer_infos.lastname', 'customer_infos.firstname'];

        // * Jointure pour pouvoir trier les colonnes.
        /** @var \Illuminate\Database\Eloquent\Builder */
        $query = CustomerInfo::join('customer_logins', function (JoinClause $join) {
            $join->on('customer_logins.brand_id', '=', 'customer_infos.brand_id')
            ->on('customer_logins.customer_id', '=', 'customer_infos.customer_id');
        })
        ->join('customers', function (JoinClause $join) {
            $join->on('customers.id', '=', 'customer_infos.customer_id');
        })
        ->join('brands', function (JoinClause $join) {
            $join->on('brands.id', '=', 'customer_infos.brand_id');
        });
        if (request()->brand or Session::has("crud.$modelTable.brand")) {
            $brand = $request->brand ?? Session::get("crud.$modelTable.brand");
            Session::put("crud.$modelTable.brand", $brand);
            $query = $query->where('customer_infos.brand_id', $brand);
        }

        // * Search on crud Label column.
        if ($request->search or Session::has("crud.$modelTable.search")) {
            $search = $request->search ?? Session::get("crud.$modelTable.search");
            Session::put("crud.$modelTable.search", $search);
            $query->where(function ($q) use ($columns, $search) {
                foreach ($columns as $column) {
                    $q = $q->orWhere($column, 'LIKE', "%$search%");
                }
                $q = $q->orWhere('customers.email', 'LIKE', "%$search%");
                $q = $q->orWhere('customer_logins.last_connection', 'LIKE', "%$search%");
            });
        }

        // * Sort columns.
        if ($request->sort_col) {
            Session::put("crud.$modelTable.sort_col", $request->sort_col);
        }
        if ($request->sort_way) {
            Session::put("crud.$modelTable.sort_way", $request->sort_way);
        }

        if ($request->rst) {
            Session::remove("crud.$modelTable.brand");
            Session::remove("crud.$modelTable.search");
            Session::remove("crud.$modelTable.sort_way");
            Session::remove("crud.$modelTable.sort_col");
        }
        if (
            Session::has("crud.$modelTable.sort_col") and
            Session::has("crud.$modelTable.sort_way") and
            (Schema::hasColumn($modelTable, Session::get("crud.$modelTable.sort_col")) or
            in_array(Session::get("crud.$modelTable.sort_col"), [
                'brands.name',
                'customers.email',
                'customer_infos.firstname',
                'customer_infos.lastname',
                'customer_infos.opt_in',
                'customer_logins.last_connection',
                'customer_logins.status'
            ]))
        ) {
            $query = $query->orderBy(
                Session::get("crud.$modelTable.sort_col"),
                Session::get("crud.$modelTable.sort_way")
            );
        }

        /** @var \Illuminate\Pagination\AbstractPaginator */
        $customers = $query->paginate(config('crud.paginate', 50));

        return view('customer.index', compact(
            'modelClass',
            'modelTable',
            'customers',
            'brands'
        ));
    }

    /**
     * Show a specific custmer
     *
     * @param Customer $customer
     * @param Brand    $brand
     * @return \Illuminate\Http\Response
     */
    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();

        return view('customer.show', compact(
            'customerInfos',
            'customerLogin'
        ));
    }

    /**
     * Delete a specific customer info
     *
     * @param Customer $customer
     * @param Brand    $brand
     * @return \Illuminate\Http\RedirectResponse
     */
    public function delete(Customer $customer, Brand $brand)
    {
        try {
            // TODO: Gestion avec mesBR.
            /** @var \App\Models\CustomerInfo */
            $customerInfo = $customer->info($brand, Customer::FIRST_OR_FAIL);
            /** @var \App\Models\CustomerLogin */
            $customerLogin = $customer->login($brand, Customer::FIRST_OR_FAIL);

            DB::transaction(function () use (
                $brand,
                $customer,
                $customerLogin,
                $customerInfo
            ) {
                if (
                    $customerInfo->delete() === false ||
                    $customerLogin->delete() === false
                ) {
                    throw new \ErrorException('Api failed to delete customer.');
                };

                $customer->optInHistory()->whereHas('brand', function ($q) use ($brand) {
                    $q->where('id', $brand->id);
                })->delete();

                $logins  = $customer->logins()->count();
                $infos   = $customer->infos()->count();
                $history = $customer->optInHistory()->count();

                // If customer is not associated with any brand then delete.
                if (!$logins and !$infos and !$history) {
                    if ($customer->delete() === false) {
                        throw new \ErrorException('Api failed to update customer.');
                    }
                }
            });
        } catch (\ErrorException $e) {
            return redirect()->route('customers.index')
            ->with('error', trans('Le compte n\'as pas pu être supprimé.'));
        } //end try

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

    /**
     * Show export the customers form
     *
     * @return \Illuminate\Http\Response
     */
    public function export()
    {
        $brands = Brand::all();
        return view('customer.export', compact(
            'brands'
        ));
    }

    /**
     * Exports customers following the requested export type
     *
     * @param CustomerExport $request
     * @return \Symfony\Component\HttpFoundation\StreamedResponse
     * @throws \Exception If the request export type in not handled.
     */
    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():
                $page = 1;
                /** @var \Illuminate\Database\Eloquent\Builder $req */
                $req   = CustomerInfo::where('brand_id', $request->brand)
                ->where('opt_in', true);
                $total = $req->count();
                $pages = \ceil($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',
                        $page
                    );
                    $items->map(function (CustomerInfo $customerInfo) use ($w) {
                        $w->insertOne([
                            'lastname' => $customerInfo->lastname,
                            'firstname' => $customerInfo->firstname,
                            'email' => $customerInfo->customer->email,
                            'hashcode' => $customerInfo->hashcode
                        ]);
                    });
                } while ($page++ <= $pages);
                if (!isset($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;
            default:
                throw new \Exception(sprintf('Unhandled CustomerExportType %s', $exportType->label));
        } //end switch

        /*
            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
        */

        // * The flush value should depend on your CSV size.
        $flush_threshold = 1000;

        $response->setCallback(function () use ($w, $flush_threshold) {
            foreach ($w->chunk(1024) as $offset => $chunk) {
                echo $chunk;
                if ($offset % $flush_threshold === 0) {
                    flush();
                }
            }
        });
        return $response;
    }
}