fix : correction calcule prorata congés avec un arrêt maladie long

src/Service/Leave/LongMaladieService.php

@@ -0,0 +1,116 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Leave;
+
+use App\Entity\Employee;
+use App\Repository\AbsenceRepository;
+use DateTimeImmutable;
+
+use function count;
+
+/**
+ * Detects continuous MALADIE (sick leave) periods and computes
+ * the date ranges where reduced accrual applies (after the first month grace).
+ */
+final readonly class LongMaladieService
+{
+    private const int MAX_GAP_DAYS = 3;
+
+    public function __construct(
+        private AbsenceRepository $absenceRepository,
+    ) {}
+
+    /**
+     * Returns date ranges where the reduced maladie accrual rate applies.
+     * For continuous maladie periods > 1 month, the first month is excluded (grace period).
+     *
+     * @return list<array{start: DateTimeImmutable, end: DateTimeImmutable}>
+     */
+    public function findReducedRatePeriods(
+        Employee $employee,
+        DateTimeImmutable $from,
+        DateTimeImmutable $to
+    ): array {
+        // Look back 13 months to catch maladie that started before the exercise period
+        $extendedFrom = $from->modify('-13 months');
+        $dates        = $this->absenceRepository->findMaladieDatesByEmployee($employee, $extendedFrom, $to);
+        if ([] === $dates) {
+            return [];
+        }
+
+        $periods = $this->consolidateIntoPeriods($dates);
+
+        return $this->applyFirstMonthGrace($periods);
+    }
+
+    /**
+     * Count calendar days in [monthStart, monthEnd] that fall within reduced maladie periods.
+     *
+     * @param list<array{start: DateTimeImmutable, end: DateTimeImmutable}> $reducedPeriods
+     */
+    public function countReducedDaysInMonth(
+        DateTimeImmutable $monthStart,
+        DateTimeImmutable $monthEnd,
+        array $reducedPeriods
+    ): int {
+        $total = 0;
+        foreach ($reducedPeriods as $period) {
+            $overlapStart = $period['start'] > $monthStart ? $period['start'] : $monthStart;
+            $overlapEnd   = $period['end'] < $monthEnd ? $period['end'] : $monthEnd;
+
+            if ($overlapStart > $overlapEnd) {
+                continue;
+            }
+
+            $total += ((int) $overlapEnd->diff($overlapStart)->format('%a')) + 1;
+        }
+
+        return $total;
+    }
+
+    /**
+     * @param list<DateTimeImmutable> $dates sorted chronologically
+     *
+     * @return list<array{start: DateTimeImmutable, end: DateTimeImmutable}>
+     */
+    private function consolidateIntoPeriods(array $dates): array
+    {
+        $periods = [];
+        $start   = $dates[0];
+        $prev    = $start;
+
+        for ($i = 1, $count = count($dates); $i < $count; ++$i) {
+            $current = $dates[$i];
+            $gap     = (int) $prev->diff($current)->format('%a');
+            if ($gap > self::MAX_GAP_DAYS) {
+                $periods[] = ['start' => $start, 'end' => $prev];
+                $start     = $current;
+            }
+            $prev = $current;
+        }
+        $periods[] = ['start' => $start, 'end' => $prev];
+
+        return $periods;
+    }
+
+    /**
+     * @param list<array{start: DateTimeImmutable, end: DateTimeImmutable}> $periods
+     *
+     * @return list<array{start: DateTimeImmutable, end: DateTimeImmutable}>
+     */
+    private function applyFirstMonthGrace(array $periods): array
+    {
+        $result = [];
+        foreach ($periods as $period) {
+            $gracedStart = $period['start']->modify('+1 month');
+            if ($gracedStart > $period['end']) {
+                continue;
+            }
+            $result[] = ['start' => $gracedStart, 'end' => $period['end']];
+        }
+
+        return $result;
+    }
+}