<?php

namespace Modules\M3\Http\Controllers;

use DateTime;
use DB;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Schema;
use Symfony\Component\HttpFoundation\Request;

class UserPickingStats5 extends Controller
{
    public static function index(Request $request)
    {
        [$userArray] = self::loadUsers();
        [$starting, $ending, $days] = self::dateRange($request);
        $user = $request->user;
        $statistics = [];
        $totals = self::emptyTotals();

        if (isset($request->dates)) {
            [$statistics, $totals] = self::collectDailyStatistics($request, $starting, $days, $totals);
        }

        if ($request->format === 'json') {
            return response()->json($statistics);
        }

        $statistic5 = $statistics;
        $totals_array = $totals;
        $user_array = $userArray;

        return view('m3::liberty-theme.pages.UserPickingStats5', compact(
            'statistic5',
            'totals_array',
            'user_array',
            'user',
            'starting',
            'ending',
            'request',
        ));
    }

    private static function loadUsers(): array
    {
        $users = [];
        $co = '';
        $whs = '';

        try {
            $connection = config('m3.connection', 'pgsql');
            if (! Schema::connection($connection)->hasTable('icm428m')) {
                return [$users, $co, $whs];
            }

            $profile = DB::connection($connection)->table('icm428m')
                ->select('R428CO', 'R428WH')
                ->where('R428US', strtoupper((string) m3User()))
                ->first();
            $co = trim((string) ($profile->R428CO ?? ''));
            $whs = trim((string) ($profile->R428WH ?? ''));
            if ($co === '' || $whs === '') {
                return [$users, $co, $whs];
            }

            $rows = DB::connection($connection)->table('icm428m')
                ->selectRaw("R428US as userprf, (trim(R428FIRST) || ' ' || trim(R428FAMILY)) as name, R428EMPCDE as empno")
                ->where('R428EMPCDE', '!=', 0)->where('R428CO', $co)->where('R428WH', $whs)->get();
            foreach ($rows as $row) {
                $users[] = ['userprf' => trim((string) $row->userprf), 'name' => trim((string) $row->name), 'empno' => $row->empno];
            }
            array_multisort(array_column($users, 'name'), SORT_ASC, $users);
        } catch (\Throwable $e) {
            Log::warning('M3 picking user list unavailable', ['exception' => $e->getMessage()]);
        }

        return [$users, $co, $whs];
    }

    private static function dateRange(Request $request): array
    {
        if (isset($request->dates)) {
            $dates = explode(' - ', (string) $request->dates);
            $starting = $dates[0] ?? date('Y-m-d');
            $ending = $dates[1] ?? $starting;
        } else {
            $starting = date('Y-m-d', strtotime('-5 days'));
            $ending = date('Y-m-d');
        }

        $days = (int) (new DateTime($starting))->diff(new DateTime($ending))->format('%a');

        return [$starting, $ending, $days];
    }

    private static function emptyTotals(): array
    {
        return ['performance' => 0, 'blendedTargetLPH' => 0, 'actualLPH' => 0, 'grossHours' => 0];
    }

    private static function collectDailyStatistics(Request $request, string $starting, int $days, array $totals): array
    {
        $statistics = [];
        $count = 0;
        $url = $request->getSchemeAndHttpHost() . '/UserPickingStats4';

        for ($day = 0; $day <= $days; $day++) {
            $date = date('Y-m-d', strtotime($starting . "+$day days"));
            $statistics[$day] = self::fetchStatistic($request, $url, $date);
            self::addTotals($totals, $statistics[$day]);
            if (($statistics[$day]['performance'] ?? 0) > 0) {
                $count++;
            }
        }

        if ($count > 0) {
            foreach (array_keys($totals) as $key) {
                $totals[$key] /= $count;
            }
        }

        return [$statistics, $totals];
    }

    private static function fetchStatistic(Request $request, string $url, string $date): array
    {
        try {
            $response = Http::withBasicAuth((string) $request->header('php-auth-user'), (string) $request->header('php-auth-pw'))
                ->get($url, ['dates' => $date, 'user' => $request->user, 'format' => 'json']);
            $data = [];
            if ($response->successful()) {
                $decoded = json_decode($response->body(), true);
                $data = is_array($decoded) ? $decoded : [];
            }
        } catch (\Throwable $e) {
            Log::warning('M3 picking statistics unavailable', ['date' => $date, 'exception' => $e->getMessage()]);
            $data = [];
        }
        $data['day'] = $data['day'] ?? $date;
        $data['performance'] = $data['performance'] ?? 0;

        return $data;
    }

    private static function addTotals(array &$totals, array $statistic): void
    {
        foreach (array_keys($totals) as $key) {
            $totals[$key] += (float) ($statistic[$key] ?? 0);
        }
    }
}