<?php
declare(strict_types=1);

namespace Esun\FreeGift\Test\Unit\Model;

use Esun\FreeGift\Model\Config;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Serialize\Serializer\Json;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;

class ConfigTest extends TestCase
{
    #[DataProvider('thresholdProvider')]
    public function testTargetQuantityUsesConfiguredTiers(float $subtotal, int $expectedQuantity): void
    {
        $config = $this->createConfig(true);

        self::assertSame($expectedQuantity, $config->getTargetQuantity($subtotal, 16));
    }

    public static function thresholdProvider(): array
    {
        return [
            'below first tier' => [198.99, 0],
            'first tier boundary' => [199.00, 1],
            'between first and second' => [298.99, 1],
            'second tier boundary' => [299.00, 2],
            'between second and third' => [398.99, 2],
            'third tier boundary' => [399.00, 3],
            'above third tier' => [1000.00, 3],
        ];
    }

    public function testDisabledCampaignReturnsNoGift(): void
    {
        self::assertSame(0, $this->createConfig(false)->getTargetQuantity(500.00, 16));
    }

    private function createConfig(bool $enabled): Config
    {
        $values = [
            'esun_free_gift/general/gift_sku' => 'FREE-FILAMENT',
            'esun_free_gift/general/start_date' => '2026-08-01',
            'esun_free_gift/general/end_date' => '2026-08-31',
            'esun_free_gift/tiers/items' => '[{"amount":199,"qty":1},{"amount":299,"qty":2},{"amount":399,"qty":3}]',
            'esun_free_gift/tiers/tier_1_amount' => '199',
            'esun_free_gift/tiers/tier_1_qty' => '1',
            'esun_free_gift/tiers/tier_2_amount' => '299',
            'esun_free_gift/tiers/tier_2_qty' => '2',
            'esun_free_gift/tiers/tier_3_amount' => '399',
            'esun_free_gift/tiers/tier_3_qty' => '3',
        ];

        $scopeConfig = $this->createMock(ScopeConfigInterface::class);
        $scopeConfig->method('isSetFlag')->willReturn($enabled);
        $scopeConfig->method('getValue')->willReturnCallback(
            static fn (string $path): ?string => $values[$path] ?? null
        );

        $timezone = $this->createMock(TimezoneInterface::class);
        $timezone->method('scopeDate')->willReturn(new \DateTime('2026-08-18'));

        return new Config($scopeConfig, $timezone, new Json());
    }
}