feat(services): add generator for public holidays in cz

app/Services/WorkingDays/PublicHolidays/Generator/PublicHolidaysCzechGenerator.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\WorkingDays\PublicHolidays\Generator;
+
+use Nubium\Exception\ThisShouldNeverHappenException;
+
+/**
+ * Generates public holidays for a given year in Czech Republic.
+ */
+class PublicHolidaysCzechGenerator implements PublicHolidaysGenerator
+{
+    // non-working days in Czech republic in format [month, day]
+    protected const array HOLIDAYS = [
+        [1, 1],
+        [5, 1],
+        [5, 8],
+        [7, 5],
+        [7, 6],
+        [9, 28],
+        [10, 28],
+        [11, 17],
+        [12, 24],
+        [12, 25],
+        [12, 26]
+    ];
+
+    public function generatePublicHolidaysForYear(int $year): array
+    {
+        $result = [];
+        foreach (static::HOLIDAYS as $holiday) {
+            $formatedDate = sprintf("%d-%02d-%02d 00:00:00", $year, $holiday[0], $holiday[1]);
+            $date = \DateTimeImmutable::createFromFormat("Y-m-d h:i:s", $formatedDate);
+            if ($date == false) {
+                throw new ThisShouldNeverHappenException("Invalid date format: $formatedDate, self::HOLIDAYS or year is incorrect.");
+            }
+            $result[] = $date;
+        }
+        // Add easters
+        $easters = $this->getEasterDateTime($year);
+        $result[] = $easters->add(new \DateInterval("P1D")); // easter Monday
+        $result[] = $easters->sub(new \DateInterval("P2D")); // easter Friday
+
+        array_multisort($result, SORT_ASC);
+
+        return $result;
+    }
+
+    private function getEasterDateTime(int $year): \DateTimeImmutable
+    {
+        $base = new \DateTime("$year-03-21");
+        $days = \easter_days($year);
+
+        return \DateTimeImmutable::createFromInterface($base->add(new \DateInterval("P{$days}D")));
+    }
+}

app/Services/WorkingDays/PublicHolidays/Generator/PublicHolidaysGenerator.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\WorkingDays\PublicHolidays\Generator;
+
+/**
+ * Generates public holidays.
+ */
+interface PublicHolidaysGenerator
+{
+    /**
+     * Generates public holidays for the given year.
+     * @param int $year
+     * @return \DateTimeImmutable[]
+     */
+    public function generatePublicHolidaysForYear(int $year): array;
+}

app/Services/WorkingDays/PublicHolidays/PublicHolidaysGeneratorFactory.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\WorkingDays\PublicHolidays;
+
+use App\Services\WorkingDays\PublicHolidays\Generator\PublicHolidaysCzechGenerator;
+use App\Services\WorkingDays\PublicHolidays\Generator\PublicHolidaysGenerator;
+
+/**
+ * Factory for creating public holidays generators
+ */
+class PublicHolidaysGeneratorFactory
+{
+    public function createPublicHolidaysGeneratorForCountry(string $countryCode): PublicHolidaysGenerator
+    {
+        return match ($countryCode) {
+            'CZ' => new PublicHolidaysCzechGenerator(),
+            default => throw new \RuntimeException('Unsupported country code'),
+        };
+    }
+}