<?php
namespace ABeCe\Booking\Service;

use ABeCe\Booking\Repository\OperationsRepository;
use ABeCe\Booking\Repository\PaymentSettingsRepository;
use ABeCe\Booking\Support\Money;
use ABeCe\Booking\Support\Time;

/** Due obligations, rather than persisted payment_status, govern online eligibility. */
final class ReceivablesService {
 public function __construct(private readonly OperationsRepository $repository,private readonly SettlementService $settlement,private readonly PaymentSettingsRepository $settings) {}
 public function getOutstandingBookings(?array $customer=null,?int $now=null): array {
  $grace=$this->settings->receivables()['outstanding_balance_grace_hours'];$until=gmdate('Y-m-d H:i:s',($now??time())-$grace*3600);$rows=[];
  foreach($this->repository->due($until,$customer!==null?$this->repository->identity($customer):null) as $b){
   $state=$this->settlement->fromTotals($b,$b['ledger_paid'],$b['ledger_refunded'],(bool)$b['ledger_invalid']);
   if($state['outstanding_amount']<=0)continue;
   $type=$b['identity_member_id']?'member':($b['identity_user_id']?'registered_non_member':($b['external_contact_id']?'external':'booking'));
   $id=match($type){'member'=>$b['identity_member_id'],'registered_non_member'=>$b['identity_user_id'],'external'=>$b['external_contact_id'],default=>$b['id']};
   $rows[]=['id'=>$b['id'],'reference'=>$b['reference'],'starts_at'=>Time::iso(Time::fromSql($b['starts_at'])),'ends_at'=>Time::iso(Time::fromSql($b['ends_at'])),'due_at'=>Time::iso(Time::fromSql($b['ends_at'])+$grace*3600),'resource_name'=>$b['resource_name'],'final_amount'=>$b['final_amount'],'currency'=>$b['currency'],'financial'=>$state,'payment_method'=>$b['payment_method'],'status'=>$b['status'],'customer_type'=>$type,'customer_id'=>$id,'customer_name'=>$b['customer_name'],'customer_email'=>$b['customer_email']];
  }return $rows;
 }
 public function getOutstandingForCustomer(array $customer,?int $now=null): array {
  $items=$this->getOutstandingBookings($customer,$now);$amounts=[];
  foreach($items as $b)$amounts[$b['currency']]=Money::add($amounts[$b['currency']]??0,$b['financial']['outstanding_amount']);
  ksort($amounts);return ['blocked'=>$this->settings->receivables()['block_booking_with_outstanding_balance']&&count($items)>0,'amounts_by_currency'=>$amounts,'items'=>$items];
 }
 public function hasOverdueBalance(array $customer,?int $now=null): bool {return []!==$this->getOutstandingBookings($customer,$now);}
 /** Explicit projection: no query parameter may choose a different account. */
 public function forUser(int $user): array {
  BookingValidator::login($user);$result=$this->getOutstandingForCustomer(['customer_user_id'=>$user]);
  foreach($result['items'] as &$item)unset($item['customer_type'],$item['customer_id'],$item['customer_name'],$item['customer_email']);unset($item);
  return $result+['timezone'=>wp_timezone()->getName()];
 }
 public function clientDetail(int $user,int $id,PaymentService $payments): array {
  $result=$this->forUser($user);
  foreach($result['items'] as $item)if($item['id']===$id){
   // Membership-only historical bookings are authorized through the same OR identity lookup.
   $b=$this->repository->booking($id);
   return $item+['payment_instructions'=>$payments->instructions($b),'timezone'=>wp_timezone()->getName()];
  }
  throw new \ABeCe\Booking\Domain\CatalogException('abece_booking_not_found',__('The booking was not found.','abece-booking'),404);
 }
 public function getAdminDebtors(array $filters): array {
  $groups=[];$search=mb_strtolower($filters['search']??'');
  foreach($this->getOutstandingBookings() as $b){
   if(!empty($filters['currency'])&&$b['currency']!==$filters['currency'])continue;
   if(!empty($filters['customer_type'])&&$b['customer_type']!==$filters['customer_type']&&!($filters['customer_type']==='external'&&$b['customer_type']==='booking'))continue;
   $key=$b['customer_type'].':'.$b['customer_id'].':'.$b['currency'];
   if(!isset($groups[$key]))$groups[$key]=['customer_type'=>$b['customer_type'],'customer_id'=>$b['customer_id'],'customer_name'=>$b['customer_name'],'currency'=>$b['currency'],'outstanding_amount'=>0,'item_count'=>0,'oldest_debt'=>$b['due_at'],'relevant_booking'=>$b['reference'],'booking_id'=>$b['id'],'matches_search'=>false];
   $g=&$groups[$key];$g['outstanding_amount']=Money::add($g['outstanding_amount'],$b['financial']['outstanding_amount']);$g['item_count']++;$g['matches_search']=$g['matches_search']||$search===''||str_contains(mb_strtolower($b['customer_name'].' '.$b['customer_email'].' '.$b['reference']),$search);$g['relevant_booking']=$b['reference'];$g['booking_id']=$b['id'];unset($g);
  }
  $groups=array_values(array_filter($groups,static fn($g)=>$g['matches_search']));
  // Largest balances are ordered within currency, never compared across currencies.
  usort($groups,static function($a,$b)use($filters){
   if(($filters['sort']??'oldest')==='largest')return strcmp($a['currency'],$b['currency'])?:($b['outstanding_amount']<=>$a['outstanding_amount'])?:strcmp($a['oldest_debt'],$b['oldest_debt']);
   return strcmp($a['oldest_debt'],$b['oldest_debt'])?:strcmp($a['currency'],$b['currency']);
  });
  foreach($groups as &$g)unset($g['matches_search']);unset($g);
  return ['items'=>array_slice($groups,(($filters['page']??1)-1)*($filters['per_page']??25),$filters['per_page']??25),'total'=>count($groups),'timezone'=>wp_timezone()->getName()];
 }
 public function adminDetail(string $type,int $id,int $page,int $perPage): array {
  $identity=match($type){'member'=>['customer_member_id'=>$id],'registered_non_member'=>['customer_user_id'=>$id],'external'=>['external_contact_id'=>$id],'booking'=>['id'=>$id]};
  $result=$this->getOutstandingForCustomer($identity);$total=count($result['items']);$result['items']=array_slice($result['items'],($page-1)*$perPage,$perPage);return $result+['total'=>$total,'timezone'=>wp_timezone()->getName()];
 }
}