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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 Illuminate\Support\Facades\Log; |
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use Siak\Tontine\Model\Fund; |
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use Siak\Tontine\Model\Saving; |
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use Siak\Tontine\Model\Session; |
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use Siak\Tontine\Service\BalanceCalculator; |
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use Siak\Tontine\Service\TenantService; |
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use Siak\Tontine\Service\Tontine\FundService; |
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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 Saving $saving |
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* |
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* @return int |
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*/ |
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private function getSavingDuration(Collection $sessions, Saving $saving): 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->start_at > $saving->session->start_at) |
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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(function($gcd, $value) { |
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if($gcd === 0) |
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{ |
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return $value; |
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} |
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return gmp_gcd($gcd, $value); |
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}, $values->first()); |
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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 void |
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*/ |
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private function setDistributions(Distribution $distribution): void |
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{ |
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$sessions = $distribution->sessions; |
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$savings = $distribution->savings; |
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// Set savings durations and distributions |
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foreach($savings as $saving) |
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{ |
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$saving->duration = $this->getSavingDuration($sessions, $saving); |
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$saving->parts = $saving->amount * $saving->duration; |
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$saving->profit = 0; |
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$saving->percent = 0; |
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} |
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$distribution->selected = $savings->filter(fn($saving) => $saving->duration > 0); |
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// The value of the unit part is the gcd of the saving amounts. |
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// The distribution values might be optimized by using the saving parts value |
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// instead of the amount, but the resulting part amount might be confusing |
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// since it can be greater than some saving amounts in certain cases. |
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$partsGcd = $this->gcd($distribution->selected->pluck('parts')); |
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if($partsGcd > 0) |
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{ |
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$amountGcd = $this->gcd($distribution->selected->pluck('amount')); |
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$distribution->partAmount = $amountGcd; |
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$savings->each(function($saving) use($partsGcd, $amountGcd) { |
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$saving->profit = $saving->parts / $partsGcd; |
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$saving->parts /= $amountGcd; |
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}); |
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$profitSum = $savings->sum('profit'); |
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$profitAmount = $distribution->profitAmount; |
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$savings->each(function($saving) use($profitSum, $profitAmount) { |
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$percent = $saving->profit / $profitSum; |
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$saving->percent = $percent * 100; |
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$saving->profit = (int)($profitAmount * $percent); |
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}); |
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} |
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} |
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/** |
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* Get the profit distribution for savings. |
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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 = $this->fundService->getFundSessions($session, $fund); |
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// Get the savings to be rewarded |
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$savings = $fund->savings() |
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->select('savings.*') |
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->join('members', 'members.id', '=', 'savings.member_id') |
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->join('sessions', 'sessions.id', '=', 'savings.session_id') |
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->whereIn('sessions.id', $sessions->pluck('id')) |
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->orderBy('members.name', 'asc') |
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->orderBy('sessions.start_at', 'asc') |
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->with(['session', 'member']) |
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->get(); |
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$distribution = new Distribution($sessions, $savings, $profitAmount); |
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if($savings->count() === 0) |
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{ |
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return $distribution; |
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} |
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// Reduce the distributions by the value of the unit part. |
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$this->setDistributions($distribution); |
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return $distribution; |
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} |
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/** |
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* Get the total saving and profit amounts. |
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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 array<int> |
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*/ |
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public function getSavingAmounts(Session $session, Fund $fund): array |
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{ |
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// Get the ids of all the sessions until the current one. |
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$sessionIds = $this->fundService->getFundSessionIds($session, $fund); |
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return [ |
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'saving' => $this->balanceCalculator->getSavingsAmount($sessionIds, $fund), |
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'refund' => $this->balanceCalculator->getRefundsAmount($sessionIds, $fund) + |
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$this->balanceCalculator->getPartialRefundsAmount($sessionIds, $fund), |
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]; |
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} |
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} |
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lagdo /
tontine
