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<?php |
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namespace Siak\Tontine\Service\Meeting\Saving; |
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use Illuminate\Support\Collection; |
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use Siak\Tontine\Model\Fund; |
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use Siak\Tontine\Model\ProfitTransfer as Transfer; |
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use Siak\Tontine\Model\Session; |
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use Siak\Tontine\Service\Meeting\Saving\FundService; |
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use Siak\Tontine\Service\Payment\BalanceCalculator; |
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use Siak\Tontine\Service\TenantService; |
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use function gmp_gcd; |
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class ProfitService |
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{ |
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/** |
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* @param BalanceCalculator $balanceCalculator |
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* @param TenantService $tenantService |
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* @param FundService $fundService |
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*/ |
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public function __construct(private BalanceCalculator $balanceCalculator, |
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private TenantService $tenantService, private FundService $fundService) |
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{} |
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/** |
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* @param Collection $sessions |
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* @param Transfer $transfer |
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* |
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* @return int |
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*/ |
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private function getTransferDuration(Collection $sessions, Transfer $transfer): int |
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{ |
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// Count the number of sessions before the current one. |
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return $sessions |
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->filter(fn($session) => $session->day_date > $transfer->session->day_date) |
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->count(); |
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} |
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/** |
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* @param Collection $values |
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* |
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* @return int |
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*/ |
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private function gcd(Collection $values): int |
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{ |
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return (int)$values->reduce( |
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fn($gcd, $value) => $gcd === 0 || $value === 0 ? 0 : gmp_gcd($gcd, $value), |
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$values->first() |
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); |
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} |
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/** |
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* Get the amount corresponding to one part for a given distribution |
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* |
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* @param Distribution $distribution |
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* |
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* @return Distribution |
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*/ |
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private function setDistributions(Distribution $distribution): Distribution |
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{ |
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$sessions = $distribution->sessions; |
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$transfers = $distribution->transfers; |
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// Set transfers durations and distributions |
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foreach($transfers as $transfer) |
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{ |
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$transfer->duration = $this->getTransferDuration($sessions, $transfer); |
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// The number of parts is determined by the transfer amount and duration. |
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$transfer->parts = $transfer->amount * $transfer->duration; |
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$transfer->profit = 0; |
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$transfer->percent = 0; |
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} |
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$distribution->rewarded = $transfers->filter(fn($transfer) => $transfer->duration > 0); |
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// The value of the unit part is the gcd of the transfer amounts. |
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// The distribution values is optimized by using the transfer parts value instead |
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// of the amount, but the resulting part amount might be confusing when displayed |
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// to the users since it can be greater than some transfer amounts in certain cases. |
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$partsGcd = $this->gcd($distribution->rewarded->pluck('parts')); |
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if($partsGcd === 0) |
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{ |
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return $distribution; |
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} |
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$amountGcd = $this->gcd($distribution->rewarded->pluck('amount')); |
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$distribution->partAmount = $amountGcd; |
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$transfers->each(function($transfer) use($partsGcd, $amountGcd) { |
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$transfer->profit = $transfer->parts * $transfer->coef / $partsGcd; |
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$transfer->parts /= $amountGcd * $transfer->coef; |
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$transfer->amount *= $transfer->coef; |
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}); |
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return $distribution; |
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} |
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/** |
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* Get the profit distribution for transfers. |
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* |
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* @param Session $session |
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* @param Fund $fund |
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* @param int $profitAmount |
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* |
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* @return Distribution |
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*/ |
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public function getDistribution(Session $session, Fund $fund, int $profitAmount): Distribution |
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{ |
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$sessions = $this->fundService->getFundSessions($fund, $session); |
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// Get the transfers until the given session. |
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$transfers = Transfer::query() |
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->select('v_profit_transfers.*') |
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->join('members', 'members.id', '=', 'v_profit_transfers.member_id') |
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->join('member_defs', 'members.def_id', '=', 'member_defs.id') |
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->join('sessions', 'sessions.id', '=', 'v_profit_transfers.session_id') |
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->whereFund($fund) |
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->whereIn('sessions.id', $sessions->pluck('id')) |
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->orderBy('member_defs.name', 'asc') |
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->orderBy('sessions.day_date', 'asc') |
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->with(['session', 'member']) |
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->get(); |
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$distribution = new Distribution($sessions, $transfers, $profitAmount); |
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return $transfers->count() === 0 ? $distribution: |
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$this->setDistributions($distribution); |
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} |
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/** |
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* Get the refunds amount. |
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* |
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* @param Session $session |
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* @param Fund $fund |
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* |
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* @return int |
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*/ |
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public function getRefundsAmount(Session $session, Fund $fund): int |
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{ |
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// Get the ids of all the sessions until the current one. |
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$sessionIds = $this->fundService->getFundSessionIds($fund, $session); |
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return $this->balanceCalculator->getRefundsAmount($sessionIds, $fund) + |
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$this->balanceCalculator->getPartialRefundsAmount($sessionIds, $fund); |
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} |
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} |
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lagdo /
tontine
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