Add holidays for Finland

src/Countries/Finland.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Finland extends Country
+{
+    public function countryCode(): string
+    {
+        return 'fi';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge($this->fixedHolidays($year), $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function fixedHolidays(int $year): array
+    {
+        return [
+            'Uudenvuodenpäivä' => CarbonImmutable::create($year, 1, 1),
+            'Loppiainen' => CarbonImmutable::create($year, 1, 6),
+            'Vappu' => CarbonImmutable::create($year, 5, 1),
+            'Itsenäisyyspäivä' => CarbonImmutable::create($year, 12, 6),
+            'Joulupäivä' => CarbonImmutable::create($year, 12, 25),
+            'Tapaninpäivä' => CarbonImmutable::create($year, 12, 26),
+        ];
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Europe/Helsinki');
+
+        $midsummerDay = CarbonImmutable::create($year, 6, 20)->next(CarbonImmutable::SATURDAY);
+
+        return [
+            'Pitkäperjantai' => $easter->subDays(2),
+            'Pääsiäispäivä' => $easter,
+            'Toinen pääsiäispäivä' => $easter->addDay(),
+            'Helatorstai' => $easter->addDays(39),
+            'Helluntaipäivä' => $easter->addDays(49),
+            'Juhannuspäivä' => $midsummerDay->day > 26
+                ? $midsummerDay->subWeek()
+                : $midsummerDay,
+            'Pyhäinpäivä' => CarbonImmutable::create($year, 10, 31)
+                ->next(CarbonImmutable::SATURDAY),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/FinlandTest/it_can_calculate_finnish_holidays.snap

@@ -0,0 +1,54 @@
+[
+    {
+        "name": "Uudenvuodenp\u00e4iv\u00e4",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Loppiainen",
+        "date": "2024-01-06"
+    },
+    {
+        "name": "Pitk\u00e4perjantai",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "P\u00e4\u00e4si\u00e4isp\u00e4iv\u00e4",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Toinen p\u00e4\u00e4si\u00e4isp\u00e4iv\u00e4",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "Vappu",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Helatorstai",
+        "date": "2024-05-09"
+    },
+    {
+        "name": "Helluntaip\u00e4iv\u00e4",
+        "date": "2024-05-19"
+    },
+    {
+        "name": "Juhannusp\u00e4iv\u00e4",
+        "date": "2024-06-22"
+    },
+    {
+        "name": "Pyh\u00e4inp\u00e4iv\u00e4",
+        "date": "2024-11-02"
+    },
+    {
+        "name": "Itsen\u00e4isyysp\u00e4iv\u00e4",
+        "date": "2024-12-06"
+    },
+    {
+        "name": "Joulup\u00e4iv\u00e4",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Tapaninp\u00e4iv\u00e4",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/FinlandTest.php

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