<?php

namespace App\Http\Controllers\User;

use App\Http\Controllers\Controller;
use App\Services\Backoffice\BackofficeDashboardService;
use App\Services\Backoffice\BackofficeDrilldownService;
use App\Services\HTMLHelper;
use Illuminate\Http\Request;
use Illuminate\View\View;
use Symfony\Component\HttpFoundation\StreamedResponse;

class BackofficeStatisticsController extends Controller
{
    private const SESSION_MONTH_KEY = 'backoffice_statistics_month';

    private const SESSION_YEAR_KEY = 'backoffice_statistics_year';

    public function __construct(
        private BackofficeDashboardService $dashboardService,
        private BackofficeDrilldownService $drilldownService
    ) {
        $this->middleware('active.account');
    }

    public function index(Request $request): View
    {
        if (! $request->user()?->isVIP()) {
            abort(404);
        }

        [$selectedMonth, $selectedYear] = $this->selectedPeriod($request);
        $startTime = microtime(true);
        $statistics = $this->dashboardService->overview($request->user(), $selectedMonth, $selectedYear);
        $performance = [
            'duration_ms' => round((microtime(true) - $startTime) * 1000, 2),
            'source_label' => $statistics['_meta']['source_label'] ?? 'Live',
            'calculated_at' => $statistics['_meta']['calculated_at'] ?? null,
        ];

        return view('user.backoffice.statistics.index', [
            'selectedMonth' => $selectedMonth,
            'selectedYear' => $selectedYear,
            'filterMonths' => HTMLHelper::getTransMonths(),
            'filterYears' => HTMLHelper::getYearRange(2022),
            'statistics' => $statistics,
            'performance' => $performance,
        ]);
    }

    public function details(Request $request): View
    {
        if (! $request->user()?->isVIP()) {
            abort(404);
        }

        [$selectedMonth, $selectedYear] = $this->selectedPeriod($request);
        $line = (int) $request->get('line', 1);
        $metric = (string) $request->get('metric', 'consultants');

        return view('user.backoffice.statistics.details', [
            'selectedMonth' => $selectedMonth,
            'selectedYear' => $selectedYear,
            'details' => $this->drilldownService->details($request->user(), $line, $metric, $selectedMonth, $selectedYear),
        ]);
    }

    public function export(Request $request): StreamedResponse
    {
        if (! $request->user()?->isVIP()) {
            abort(404);
        }

        [$selectedMonth, $selectedYear] = $this->selectedPeriod($request);
        $line = (int) $request->get('line', 1);
        $metric = (string) $request->get('metric', 'consultants');
        $details = $this->drilldownService->details($request->user(), $line, $metric, $selectedMonth, $selectedYear);
        $filename = sprintf(
            'backoffice-statistik-%s-linie-%s-%02d-%d.csv',
            $metric,
            $line === 0 ? 'alle' : $line,
            $selectedMonth,
            $selectedYear
        );

        return response()->streamDownload(function () use ($details): void {
            $output = fopen('php://output', 'w');

            fwrite($output, "\xEF\xBB\xBF");
            fputcsv($output, $this->csvHeaders($details['metric']), ';');

            foreach ($details['rows'] as $row) {
                fputcsv($output, $this->csvRow($details['metric'], $row), ';');
            }

            fputcsv($output, []);
            fputcsv($output, $this->csvSummaryRow($details), ';');

            fclose($output);
        }, $filename, [
            'Content-Type' => 'text/csv; charset=UTF-8',
        ]);
    }

    public function overviewExport(Request $request): StreamedResponse
    {
        if (! $request->user()?->isVIP()) {
            abort(404);
        }

        [$selectedMonth, $selectedYear] = $this->selectedPeriod($request);
        $statistics = $this->dashboardService->overview($request->user(), $selectedMonth, $selectedYear);
        $filename = sprintf('backoffice-statistik-uebersicht-%02d-%d.csv', $selectedMonth, $selectedYear);

        return response()->streamDownload(function () use ($statistics): void {
            $output = fopen('php://output', 'w');

            fwrite($output, "\xEF\xBB\xBF");
            fputcsv($output, $this->overviewCsvHeaders(), ';');

            foreach ($statistics['lines'] as $line) {
                fputcsv($output, $this->overviewCsvRow($line), ';');
            }

            fputcsv($output, []);
            fputcsv($output, $this->overviewCsvRow($statistics['totals']), ';');

            fclose($output);
        }, $filename, [
            'Content-Type' => 'text/csv; charset=UTF-8',
        ]);
    }

    /**
     * @return array{0: int, 1: int}
     */
    private function selectedPeriod(Request $request): array
    {
        $selectedMonth = max(1, min(12, (int) $request->get('month', session(self::SESSION_MONTH_KEY, now()->month))));
        $selectedYear = (int) $request->get('year', session(self::SESSION_YEAR_KEY, now()->year));

        session([
            self::SESSION_MONTH_KEY => $selectedMonth,
            self::SESSION_YEAR_KEY => $selectedYear,
        ]);

        return [$selectedMonth, $selectedYear];
    }

    /**
     * @return string[]
     */
    private function overviewCsvHeaders(): array
    {
        return [
            'Linie',
            'Berater',
            'Neupartner',
            'Teamabos',
            'Neue Teamabos',
            'Teamkundenabos',
            'Neue Teamkundenabos',
            'Eigenpunkte',
            'Externe Punkte',
            'Kundenabo-Punkte',
            'Einzelbestellungs-Punkte',
            'Sonstige Kundenpunkte',
            'Gesamtpunkte',
            '1000 Punkte Shop',
            'Umsatz Netto',
        ];
    }

    /**
     * @param  array<string, mixed>  $row
     * @return array<int, mixed>
     */
    private function overviewCsvRow(array $row): array
    {
        return [
            $row['label'] ?? '',
            $row['consultants'] ?? 0,
            $row['new_partners'] ?? 0,
            $row['team_partner_abos'] ?? 0,
            $row['team_partner_abos_new'] ?? 0,
            $row['team_customer_abos'] ?? 0,
            $row['team_customer_abos_new'] ?? 0,
            $row['own_points'] ?? 0,
            $row['external_points'] ?? 0,
            $row['customer_abo_points'] ?? 0,
            $row['customer_single_order_points'] ?? 0,
            $row['customer_other_points'] ?? 0,
            $row['total_points'] ?? 0,
            $row['shop_1000'] ?? 0,
            $row['turnover_net'] ?? 0,
        ];
    }

    /**
     * @return string[]
     */
    private function csvHeaders(string $metric): array
    {
        if (in_array($metric, ['team_partner_abos', 'team_customer_abos'], true)) {
            return ['Name', 'E-Mail', 'Karriere-Level', 'Berater', 'Abo-Punkte', 'Status', 'Status-Grund', 'Besteht seit', 'Naechste Ausfuehrung', 'Lieferungen'];
        }

        if (in_array($metric, ['own_points', 'external_points', 'customer_abo_points', 'customer_single_order_points', 'customer_other_points', 'total_points', 'shop_1000'], true)) {
            return ['Name', 'E-Mail', 'Karriere-Level', 'Eigenpunkte', 'Externe Punkte', 'Kundenabo-Punkte', 'Einzelbestellungs-Punkte', 'Sonstige Kundenpunkte', 'Gesamtpunkte'];
        }

        return ['Name', 'E-Mail', 'Karriere-Level', 'Aktiv seit', 'Account gueltig bis', 'Account Status'];
    }

    /**
     * @param  array<string, mixed>  $row
     * @return array<int, mixed>
     */
    private function csvRow(string $metric, array $row): array
    {
        if (in_array($metric, ['team_partner_abos', 'team_customer_abos'], true)) {
            return [
                $row['name'] ?? '',
                $row['email'] ?? '',
                $row['career_level'] ?? '',
                $row['consultant_name'] ?? $row['name'] ?? '',
                $row['points'] ?? 0,
                $row['status_label'] ?? '',
                $row['status_reason'] ?? '',
                $row['start_date'] ?? '',
                $row['next_date'] ?? '',
                $row['deliveries'] ?? 0,
            ];
        }

        if (in_array($metric, ['own_points', 'external_points', 'customer_abo_points', 'customer_single_order_points', 'customer_other_points', 'total_points', 'shop_1000'], true)) {
            return [
                $row['name'] ?? '',
                $row['email'] ?? '',
                $row['career_level'] ?? '',
                $row['own_points'] ?? 0,
                $row['external_points'] ?? 0,
                $row['customer_abo_points'] ?? 0,
                $row['customer_single_order_points'] ?? 0,
                $row['customer_other_points'] ?? 0,
                $row['total_points'] ?? 0,
            ];
        }

        return [
            $row['name'] ?? '',
            $row['email'] ?? '',
            $row['career_level'] ?? '',
            $row['active_date'] ?? '',
            $row['payment_account'] ?? '',
            $row['account_status'] ?? '',
        ];
    }

    /**
     * @param  array<string, mixed>  $details
     * @return array<int, mixed>
     */
    private function csvSummaryRow(array $details): array
    {
        $metric = $details['metric'];
        $summary = $details['summary'];

        if (in_array($metric, ['team_partner_abos', 'team_customer_abos'], true)) {
            return ['Summe', $summary['count'].' Eintraege', '', '', $summary['points'], '', '', '', '', $summary['deliveries']];
        }

        if (in_array($metric, ['own_points', 'external_points', 'customer_abo_points', 'customer_single_order_points', 'customer_other_points', 'total_points', 'shop_1000'], true)) {
            return ['Summe', $summary['count'].' Eintraege', '', $summary['own_points'], $summary['external_points'], $summary['customer_abo_points'], $summary['customer_single_order_points'], $summary['customer_other_points'], $summary['total_points']];
        }

        return ['Summe', $summary['count'].' Eintraege', '', '', '', ''];
    }
}