Add Romanian Holidays (#27)

* add romanian holidays

* add Epiphany and Saint John public holidays

* fix static analysis

* Fix styling

* add formula to calculate the difference between Julian and Gregorian calendars

* Fix styling

* add the source of the orthodox easter algorithm

* Fix styling

* fix phpstan

* remove orthodoxEaster function from Romania class

src/Countries/Romania.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Romania extends Country
+{
+    public function countryCode(): string
+    {
+        return 'ro';
+    }
+
+    /** @return array<string, string|CarbonImmutable> */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Anul Nou' => '01-01',
+            'A doua zi de Anul Nou' => '01-02',
+            'Bobotează' => '01-06',
+            'Sfântul Ion' => '01-07',
+            'Ziua Unirii Principatelor Române' => '01-24',
+            'Ziua Muncii' => '05-01',
+            'Ziua Copilului' => '06-01',
+            'Adormirea Maicii Domnului' => '08-15',
+            'Sfântul Andrei' => '11-30',
+            'Ziua Națională' => '12-01',
+            'Crăciunul' => '12-25',
+            'A doua zi de Crăciun' => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /**
+     * @return array<string, CarbonImmutable>
+     */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = $this->orthodoxEaster($year);
+        $easterMonday = $easter->addDay();
+        $goodFriday = $easter->subDays(2);
+
+        $pentecost = $this->orthodoxPentecost($year);
+        $pentecostMonday = $pentecost->addDay();
+
+        return [
+            'Vinerea Mare' => $goodFriday,
+            'Paștele' => $easter,
+            'A doua zi de Paște' => $easterMonday,
+            'Rusaliile' => $pentecost,
+            'A doua zi de Rusalii' => $pentecostMonday,
+        ];
+    }
+
+    protected function orthodoxPentecost(int $year): CarbonImmutable
+    {
+        $easter = $this->orthodoxEaster($year);
+
+        return $easter->addDays(49);
+    }
+}

tests/.pest/snapshots/Countries/RomaniaTest/it_can_calculate_romanian_holidays.snap

@@ -0,0 +1,70 @@
+[
+    {
+        "name": "Anul Nou",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "A doua zi de Anul Nou",
+        "date": "2024-01-02"
+    },
+    {
+        "name": "Boboteaz\u0103",
+        "date": "2024-01-06"
+    },
+    {
+        "name": "Sf\u00e2ntul Ion",
+        "date": "2024-01-07"
+    },
+    {
+        "name": "Ziua Unirii Principatelor Rom\u00e2ne",
+        "date": "2024-01-24"
+    },
+    {
+        "name": "Ziua Muncii",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Vinerea Mare",
+        "date": "2024-05-03"
+    },
+    {
+        "name": "Pa\u0219tele",
+        "date": "2024-05-05"
+    },
+    {
+        "name": "A doua zi de Pa\u0219te",
+        "date": "2024-05-06"
+    },
+    {
+        "name": "Ziua Copilului",
+        "date": "2024-06-01"
+    },
+    {
+        "name": "Rusaliile",
+        "date": "2024-06-23"
+    },
+    {
+        "name": "A doua zi de Rusalii",
+        "date": "2024-06-24"
+    },
+    {
+        "name": "Adormirea Maicii Domnului",
+        "date": "2024-08-15"
+    },
+    {
+        "name": "Sf\u00e2ntul Andrei",
+        "date": "2024-11-30"
+    },
+    {
+        "name": "Ziua Na\u021bional\u0103",
+        "date": "2024-12-01"
+    },
+    {
+        "name": "Cr\u0103ciunul",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "A doua zi de Cr\u0103ciun",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/RomaniaTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate romanian holidays', function () {
+    CarbonImmutable::setTestNowAndTimezone('2024-01-01');
+
+    $holidays = Holidays::for(country: 'ro')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+
+});