<?php
namespace Tests\Unit\Domain\Promotion;

use PHPUnit\Framework\TestCase;
use Domain\Promotion\PromotionRepository;

class PromotionRepositoryTest extends TestCase
{
    public function testFindReturnsDefaultPromotionForInvalidId(): void
    {
        $mockDb = $this->createMock(\medoo::class);
        $repository = new PromotionRepository($mockDb);

        $result = $repository->find(0);

        $this->assertIsArray($result);
        $this->assertSame(0, (int)$result['id']);
        $this->assertSame(1, (int)$result['status']);
        $this->assertNull($result['date_from']);
        $this->assertSame([], $result['categories']);
        $this->assertSame([], $result['condition_categories']);
    }

    public function testSaveInsertsPromotionAndReturnsId(): void
    {
        $mockDb = $this->createMock(\medoo::class);
        $insertRow = null;

        $mockDb->expects($this->once())
            ->method('insert')
            ->willReturnCallback(function ($table, $row) use (&$insertRow) {
                $this->assertSame('pp_shop_promotion', $table);
                $this->assertArrayHasKey('name', $row);
                $insertRow = $row;
            });

        $mockDb->expects($this->once())
            ->method('id')
            ->willReturn(123);

        $repository = new PromotionRepository($mockDb);
        $id = $repository->save([
            'name' => 'Promocja testowa',
            'status' => 'on',
            'condition_type' => 1,
            'discount_type' => 1,
            'amount' => '10',
            'date_from' => '2026-02-01',
            'categories' => [1, 2],
        ]);

        $this->assertSame(123, $id);
        $this->assertIsArray($insertRow);
        $this->assertSame('2026-02-01', $insertRow['date_from'] ?? null);
    }

    public function testDeleteReturnsFalseForInvalidId(): void
    {
        $mockDb = $this->createMock(\medoo::class);
        $mockDb->expects($this->never())->method('delete');

        $repository = new PromotionRepository($mockDb);
        $this->assertFalse($repository->delete(0));
    }

    public function testDeleteReturnsTrueWhenDatabaseDeleteSucceeds(): void
    {
        $mockDb = $this->createMock(\medoo::class);
        $mockDb->expects($this->once())
            ->method('delete')
            ->with('pp_shop_promotion', ['id' => 55])
            ->willReturn(true);

        $repository = new PromotionRepository($mockDb);
        $this->assertTrue($repository->delete(55));
    }

    public function testListForAdminWhitelistsSortAndDirection(): void
    {
        $mockDb = $this->createMock(\medoo::class);
        $queries = [];

        $mockDb->method('query')
            ->willReturnCallback(function ($sql, $params = []) use (&$queries) {
                $queries[] = ['sql' => $sql, 'params' => $params];

                if (strpos($sql, 'COUNT(0)') !== false) {
                    return new class {
                        public function fetchAll()
                        {
                            return [[1]];
                        }
                    };
                }

                return new class {
                    public function fetchAll()
                    {
                        return [[
                            'id' => 1,
                            'name' => 'Promo',
                            'status' => 1,
                            'condition_type' => 1,
                            'date_to' => null,
                        ]];
                    }
                };
            });

        $repository = new PromotionRepository($mockDb);
        $repository->listForAdmin(
            [],
            'date_to DESC; DROP TABLE pp_shop_promotion; --',
            'DESC; DELETE FROM pp_users; --',
            1,
            500
        );

        $this->assertCount(2, $queries);
        $dataSql = $queries[1]['sql'];

        $this->assertMatchesRegularExpression('/ORDER BY\s+sp\.id\s+DESC,\s+sp\.id\s+DESC/i', $dataSql);
        $this->assertStringNotContainsString('DROP TABLE', $dataSql);
        $this->assertStringNotContainsString('DELETE FROM pp_users', $dataSql);
        $this->assertMatchesRegularExpression('/LIMIT\s+100\s+OFFSET\s+0/i', $dataSql);
    }

    public function testCategoriesTreeReturnsHierarchy(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        $mockDb->method('select')
            ->willReturnCallback(function ($table, $columns, $where) {
                if ($table === 'pp_shop_categories' && array_key_exists('parent_id', $where)) {
                    if ($where['parent_id'] === null) {
                        return [['id' => 10]];
                    }
                    if ((int)$where['parent_id'] === 10) {
                        return [['id' => 11]];
                    }
                    return [];
                }

                if ($table === 'pp_shop_categories_langs') {
                    if ((int)$where['category_id'] === 10) {
                        return [['lang_id' => 'pl', 'title' => 'Kategoria A']];
                    }
                    if ((int)$where['category_id'] === 11) {
                        return [['lang_id' => 'pl', 'title' => 'Podkategoria A1']];
                    }
                    return [];
                }

                if ($table === 'pp_langs') {
                    return [['id' => 'pl', 'start' => 1, 'o' => 1]];
                }

                return [];
            });

        $mockDb->method('get')
            ->willReturnCallback(function ($table, $columns, $where) {
                if ($table === 'pp_shop_categories') {
                    $id = (int)$where['id'];
                    return ['id' => $id, 'status' => 1];
                }
                return null;
            });

        $repository = new PromotionRepository($mockDb);
        $tree = $repository->categoriesTree(null);

        $this->assertCount(1, $tree);
        $this->assertSame(10, (int)$tree[0]['id']);
        $this->assertSame('Kategoria A', $tree[0]['title']);
        $this->assertCount(1, $tree[0]['subcategories']);
        $this->assertSame(11, (int)$tree[0]['subcategories'][0]['id']);
    }

    // =========================================================================
    // Frontend: basket promotion logic (migrated from front\factory\ShopPromotion)
    // =========================================================================

    private function mockPromotion(array $data): object
    {
        return new class($data) {
            private $data;
            public function __construct($data) { $this->data = $data; }
            public function __get($key) { return isset($this->data[$key]) ? $this->data[$key] : null; }
        };
    }

    private function makeBasket(array $items): array
    {
        $basket = [];
        foreach ($items as $i => $item) {
            $basket[$i] = array_merge(['product-id' => $item['id']], $item);
        }
        return $basket;
    }

    /**
     * Test applyTypeWholeBasket — rabat na cały koszyk
     */
    public function testApplyTypeWholeBasketAppliesDiscountToAll(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        // productCategoriesFront zwraca kategorie
        $mockDb->method('get')->willReturn(null); // parent_id = null
        $mockStmt = $this->createMock(\PDOStatement::class);
        $mockStmt->method('fetchAll')->willReturn([['category_id' => 1]]);
        $mockDb->method('query')->willReturn($mockStmt);

        $promotion = $this->mockPromotion([
            'discount_type' => 1,
            'amount' => 10,
            'include_coupon' => 0,
            'include_product_promo' => 0,
        ]);

        $basket = $this->makeBasket([
            ['id' => 1],
            ['id' => 2],
        ]);

        $repository = new PromotionRepository($mockDb);
        $result = $repository->applyTypeWholeBasket($basket, $promotion);

        $this->assertSame(1, $result[0]['discount_type']);
        $this->assertSame(10, $result[0]['discount_amount']);
        $this->assertSame(1, $result[1]['discount_type']);
    }

    /**
     * Test applyTypeCategoriesOr — rabat na produkty z kat. 1 lub 2
     */
    public function testApplyTypeCategoriesOrAppliesDiscountToMatchingCategories(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        $mockDb->method('get')->willReturn(null);
        $mockStmt = $this->createMock(\PDOStatement::class);
        $mockStmt->method('fetchAll')->willReturn([['category_id' => 5]]);
        $mockDb->method('query')->willReturn($mockStmt);

        $promotion = $this->mockPromotion([
            'categories' => json_encode([5]),
            'condition_categories' => json_encode([10]),
            'discount_type' => 1,
            'amount' => 15,
            'include_coupon' => 1,
            'include_product_promo' => 0,
        ]);

        $basket = $this->makeBasket([['id' => 1]]);

        $repository = new PromotionRepository($mockDb);
        $result = $repository->applyTypeCategoriesOr($basket, $promotion);

        $this->assertSame(1, $result[0]['discount_type']);
        $this->assertSame(15, $result[0]['discount_amount']);
        $this->assertSame(1, $result[0]['discount_include_coupon']);
    }

    /**
     * Test applyTypeCategoryCondition — rabat na kat. I jeśli kat. II w koszyku
     */
    public function testApplyTypeCategoryConditionAppliesWhenConditionMet(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        $callCount = 0;
        $mockDb->method('get')->willReturn(null);

        $mockStmt1 = $this->createMock(\PDOStatement::class);
        $mockStmt1->method('fetchAll')->willReturnOnConsecutiveCalls(
            [['category_id' => 10]], // product 1 — condition category
            [['category_id' => 5]],  // product 2 — target category
            [['category_id' => 10]], // product 1 — check for discount (not matching target)
            [['category_id' => 5]]   // product 2 — check for discount (matching target)
        );
        $mockDb->method('query')->willReturn($mockStmt1);

        $promotion = $this->mockPromotion([
            'categories' => json_encode([5]),
            'condition_categories' => json_encode([10]),
            'discount_type' => 1,
            'amount' => 20,
            'include_coupon' => 0,
            'include_product_promo' => 0,
        ]);

        $basket = $this->makeBasket([
            ['id' => 1],
            ['id' => 2],
        ]);

        $repository = new PromotionRepository($mockDb);
        $result = $repository->applyTypeCategoryCondition($basket, $promotion);

        // Produkt 2 (kat. 5) powinien mieć rabat
        $this->assertSame(1, $result[1]['discount_type']);
        $this->assertSame(20, $result[1]['discount_amount']);
    }

    /**
     * Test applyTypeCategoryCondition — brak rabatu gdy warunek niespełniony
     */
    public function testApplyTypeCategoryConditionNoDiscountWhenConditionNotMet(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        $mockDb->method('get')->willReturn(null);
        $mockStmt = $this->createMock(\PDOStatement::class);
        $mockStmt->method('fetchAll')->willReturn([['category_id' => 99]]); // nie pasuje do condition_categories
        $mockDb->method('query')->willReturn($mockStmt);

        $promotion = $this->mockPromotion([
            'categories' => json_encode([5]),
            'condition_categories' => json_encode([10]),
            'discount_type' => 1,
            'amount' => 20,
            'include_coupon' => 0,
            'include_product_promo' => 0,
        ]);

        $basket = $this->makeBasket([['id' => 1]]);

        $repository = new PromotionRepository($mockDb);
        $result = $repository->applyTypeCategoryCondition($basket, $promotion);

        $this->assertArrayNotHasKey('discount_type', $result[0]);
    }

    /**
     * Test applyTypeCategoriesAnd — rabat gdy oba warunki spełnione
     */
    public function testApplyTypeCategoriesAndAppliesWhenBothConditionsMet(): void
    {
        $mockDb = $this->createMock(\medoo::class);

        $mockDb->method('get')->willReturn(null);

        $mockStmt = $this->createMock(\PDOStatement::class);
        $mockStmt->method('fetchAll')->willReturnOnConsecutiveCalls(
            [['category_id' => 10]], // product 1 — condition_categories ✓
            [['category_id' => 5]],  // product 2 — categories ✓ (condition_2)
            [['category_id' => 10]], // product 1 — check categories ✓ (condition check)
            [['category_id' => 5]],  // product 2 — check categories ✓ (condition check)
            [['category_id' => 10]], // product 1 — discount assignment
            [['category_id' => 5]]   // product 2 — discount assignment
        );
        $mockDb->method('query')->willReturn($mockStmt);

        $promotion = $this->mockPromotion([
            'categories' => json_encode([5]),
            'condition_categories' => json_encode([10]),
            'discount_type' => 1,
            'amount' => 25,
            'include_coupon' => 1,
            'include_product_promo' => 0,
        ]);

        $basket = $this->makeBasket([
            ['id' => 1],
            ['id' => 2],
        ]);

        $repository = new PromotionRepository($mockDb);
        $result = $repository->applyTypeCategoriesAnd($basket, $promotion);

        $this->assertSame(1, $result[0]['discount_type']);
        $this->assertSame(25, $result[0]['discount_amount']);
        $this->assertSame(1, $result[1]['discount_type']);
    }
}