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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 $sessions->filter(function($session) use($saving) { |
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return $session->start_at > $saving->session->start_at; |
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})->count(); |
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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 Collection $savings |
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* |
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* @return int |
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*/ |
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private function getPartValue(Collection $savings): int |
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{ |
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// The value of the unit part is the gcd of the saving amounts. |
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// The distribution values might be optimized by using the saving distribution |
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// value instead of the amount, but the resulting part value might be confusing |
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// since it can be greater than some saving amounts in certain cases. |
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return (int)$savings->reduce(function($gcd, $saving) { |
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if($gcd === 0) |
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{ |
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return $saving->amount; |
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} |
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if($saving->duration === 0) |
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{ |
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return $gcd; |
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} |
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return gmp_gcd($gcd, $saving->amount); |
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}, $savings->first()->amount); |
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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 Collection $sessions |
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* @param Collection $savings |
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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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private function distribution(Collection $sessions, Collection $savings, |
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int $profitAmount): Distribution |
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{ |
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if($savings->count() === 0) |
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{ |
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return new Distribution($savings); |
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} |
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// Set savings durations and distributions |
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foreach($savings as $saving) |
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{ |
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$saving->duration = $this->getSavingDuration($sessions, $saving); |
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$saving->distribution = $saving->amount * $saving->duration; |
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$saving->profit = 0; |
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} |
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// Reduce the distributions by the value of the unit part. |
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$partValue = $this->getPartValue($savings); |
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if($partValue > 0) |
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{ |
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$sum = (int)($savings->sum('distribution') / $partValue); |
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foreach($savings as $saving) |
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{ |
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$saving->distribution /= $partValue; |
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$saving->profit = (int)($profitAmount * $saving->distribution / $sum); |
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} |
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} |
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return new Distribution($savings, $partValue); |
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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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return $this->distribution($sessions, $savings, $profitAmount); |
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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
