<?php

declare(strict_types=1);

namespace App\State;

use ApiPlatform\Metadata\Operation;
use ApiPlatform\State\ProviderInterface;
use App\Entity\Employee;
use App\Enum\ContractNature;
use App\Enum\ContractType;
use App\Enum\TrackingMode;
use App\Repository\EmployeeRepository;
use App\Repository\EmployeeRttBalanceRepository;
use App\Repository\EmployeeRttPaymentRepository;
use App\Repository\WorkHourRepository;
use App\Service\Rtt\RttRecoveryComputationService;
use DateTimeImmutable;
use Doctrine\ORM\EntityManagerInterface;
use Dompdf\Dompdf;
use Dompdf\Options;
use Symfony\Component\HttpFoundation\Response;
use Throwable;
use Twig\Environment;

class LeaveRecapPrintProvider implements ProviderInterface
{
    public function __construct(
        private Environment $twig,
        private EmployeeRepository $employeeRepository,
        private EmployeeLeaveSummaryProvider $leaveSummaryProvider,
        private RttRecoveryComputationService $rttRecoveryService,
        private EmployeeRttBalanceRepository $rttBalanceRepository,
        private EmployeeRttPaymentRepository $rttPaymentRepository,
        private EntityManagerInterface $entityManager,
        private WorkHourRepository $workHourRepository,
    ) {}

    public function provide(Operation $operation, array $uriVariables = [], array $context = []): Response
    {
        $today     = new DateTimeImmutable('today');
        $employees = $this->employeeRepository->findForPrintBySiteIds([]);

        $siteGroups = [];

        foreach ($employees as $employee) {
            if (!$employee->getHasActiveContract()) {
                continue;
            }

            $site   = $employee->getSite();
            $siteId = $site ? $site->getId() : 0;

            if (!isset($siteGroups[$siteId])) {
                $siteGroups[$siteId] = [
                    'name'      => $site ? $site->getName() : 'Sans site',
                    'color'     => $site?->getColor() ?? '#ffd7d7',
                    'employees' => [],
                ];
            }

            $siteGroups[$siteId]['employees'][] = $this->buildEmployeeRow($employee, $today);
            $this->entityManager->clear();
        }

        // Re-load Twig environment after clear
        $options = new Options();
        $options->set('isRemoteEnabled', true);

        $dompdf = new Dompdf($options);
        $html   = $this->twig->render('leave-recap/print.html.twig', [
            'today'      => $today,
            'siteGroups' => $siteGroups,
        ]);

        $dompdf->loadHtml($html);
        $dompdf->setPaper('A4', 'portrait');
        $dompdf->render();

        $filename = sprintf('recap_conges_%s.pdf', $today->format('Y-m-d'));

        return new Response($dompdf->output(), Response::HTTP_OK, [
            'Content-Type'        => 'application/pdf',
            'Content-Disposition' => 'inline; filename="'.$filename.'"',
        ]);
    }

    private function buildEmployeeRow(Employee $employee, DateTimeImmutable $today): array
    {
        $contract     = $employee->getContract();
        $contractName = $contract?->getName();
        $isForfait    = ContractType::FORFAIT === $contract?->getType();
        $nature       = ContractNature::tryFrom($employee->getCurrentContractNature());
        $isInterim    = ContractNature::INTERIM === $nature;

        $cpN1Remaining     = 0.0;
        $cpN               = '-';
        $acquiredSaturdays = '-';
        $rtt               = '-';

        if (!$isInterim) {
            $leaveYear   = $this->leaveSummaryProvider->resolveLeaveYearForToday($employee);
            $yearSummary = $this->leaveSummaryProvider->computeYearSummary($employee, $leaveYear);

            if (null !== $yearSummary) {
                if ($isForfait) {
                    $cpN1Remaining     = round($yearSummary['previousYearRemainingDays'], 2);
                    $cpN               = (string) round($yearSummary['acquiredDays'], 2);
                    $acquiredSaturdays = '-';
                } else {
                    $cpN1Remaining     = round($yearSummary['remainingDays'], 2);
                    $cpN               = (string) round($yearSummary['accruingDays'], 2);
                    $acquiredSaturdays = (string) round($yearSummary['remainingSaturdays'], 2);
                }
            }

            if (!$isForfait && TrackingMode::PRESENCE->value !== $contract?->getTrackingMode()) {
                try {
                    $rtt = $this->formatMinutes($this->computeAvailableRttMinutes($employee, $today));
                } catch (Throwable) {
                    $rtt = '-';
                }
            }
        }

        return [
            'lastName'          => $employee->getLastName(),
            'firstName'         => $employee->getFirstName(),
            'contractName'      => $contractName,
            'cpN1Remaining'     => $cpN1Remaining,
            'cpN'               => $cpN,
            'acquiredSaturdays' => $acquiredSaturdays,
            'rtt'               => $rtt,
        ];
    }

    private function computeAvailableRttMinutes(Employee $employee, DateTimeImmutable $today): int
    {
        $month        = (int) $today->format('n');
        $year         = (int) $today->format('Y');
        $exerciseYear = $month >= 6 ? $year + 1 : $year;

        // Exclude incomplete current week: limit to last Sunday
        $isoDay    = (int) $today->format('N');
        $limitDate = 7 === $isoDay ? $today : $today->modify('last sunday');

        // Include the current week if all existing days are admin-validated
        if (7 !== $isoDay) {
            $currentWeekStart = $today->modify('monday this week');
            $currentWeekEnd   = $currentWeekStart->modify('+6 days');
            $checkEnd         = $this->resolveWeekEndForEmployee($employee, $currentWeekStart, $currentWeekEnd, $today);
            if ($this->workHourRepository->isWeekFullyValidated($employee, $currentWeekStart, $checkEnd)) {
                $limitDate = $currentWeekEnd;
            }
        }

        // Carry from previous exercise
        $carry   = 0;
        $balance = $this->rttBalanceRepository->findOneByEmployeeAndYear($employee, $exerciseYear);
        if (null !== $balance) {
            $carry = $balance->getTotalOpeningMinutes();
        } else {
            $previousTotal = $this->rttRecoveryService->computeTotalRecoveryForExercise($employee, $exerciseYear - 1);
            $carry         = $previousTotal->totalMinutes;
        }

        // Current exercise (limited to completed weeks)
        $current = $this->rttRecoveryService->computeTotalRecoveryForExercise($employee, $exerciseYear, $limitDate);

        // Paid RTT
        $paid     = 0;
        $payments = $this->rttPaymentRepository->findByEmployeeAndYear($employee, $exerciseYear);
        foreach ($payments as $payment) {
            $paid += $payment->getBase25Minutes() + $payment->getBonus25Minutes()
                   + $payment->getBase50Minutes() + $payment->getBonus50Minutes();
        }

        return $carry + $current->totalMinutes - $paid;
    }

    private function resolveWeekEndForEmployee(Employee $employee, DateTimeImmutable $weekStart, DateTimeImmutable $weekEnd, DateTimeImmutable $today): DateTimeImmutable
    {
        foreach ($employee->getContractPeriods() as $period) {
            if ($period->getStartDate() > $today) {
                continue;
            }
            $endDate = $period->getEndDate();
            if (null === $endDate) {
                continue;
            }
            if ($endDate >= $weekStart && $endDate <= $weekEnd) {
                return $endDate;
            }
        }

        return $weekEnd;
    }

    private function formatMinutes(int $minutes): string
    {
        if (0 === $minutes) {
            return '0 h';
        }

        $sign = $minutes < 0 ? '- ' : '';
        $abs  = abs($minutes);
        $h    = intdiv($abs, 60);
        $m    = $abs % 60;

        return 0 === $m ? "{$sign}{$h} h" : "{$sign}{$h} h {$m} m";
    }
}