<?php

namespace Tests\Unit;

use App\Models\BomConditionRule;
use App\Models\Model;
use App\Models\ModelFormula;
use App\Models\ModelParameter;
use App\Services\ProductFromModelService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class ProductFromModelServiceTest extends TestCase
{
    use RefreshDatabase;

    private ProductFromModelService $service;
    private Model $model;

    protected function setUp(): void
    {
        parent::setUp();
        $this->service = new ProductFromModelService();
        $this->service->setTenantId(1)->setApiUserId(1);

        $this->model = Model::factory()->screen()->create(['code' => 'KSS01']);
        $this->setupKSS01Model();
    }

    private function setupKSS01Model(): void
    {
        // Create parameters
        ModelParameter::factory()
            ->screenParameters()
            ->create(['model_id' => $this->model->id]);

        // Create formulas
        ModelFormula::factory()
            ->screenFormulas()
            ->create(['model_id' => $this->model->id]);

        // Create condition rules
        BomConditionRule::factory()
            ->screenRules()
            ->create(['model_id' => $this->model->id]);
    }

    /** @test */
    public function it_can_resolve_bom_for_small_screen()
    {
        // Arrange
        $inputParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act
        $result = $this->service->resolveBom($this->model->id, $inputParams);

        // Assert
        $this->assertArrayHasKey('parameters', $result);
        $this->assertArrayHasKey('formulas', $result);
        $this->assertArrayHasKey('bom_items', $result);

        // Check calculated formulas
        $formulas = $result['formulas'];
        $this->assertEquals(1120, $formulas['W1']); // W0 + 120
        $this->assertEquals(900, $formulas['H1']);  // H0 + 100
        $this->assertEquals(1.008, $formulas['area']); // W1 * H1 / 1000000

        // Check BOM items
        $bomItems = $result['bom_items'];
        $this->assertGreaterThan(0, count($bomItems));

        // Check specific components
        $caseItem = collect($bomItems)->first(fn($item) => str_contains($item['component_code'], 'CASE'));
        $this->assertNotNull($caseItem);
        $this->assertEquals('CASE-SMALL', $caseItem['component_code']); // area <= 3
    }

    /** @test */
    public function it_can_resolve_bom_for_large_screen()
    {
        // Arrange
        $inputParams = [
            'W0' => 2500,
            'H0' => 1500,
            'screen_type' => 'SCREEN',
            'install_type' => 'SIDE',
            'power_source' => 'AC',
        ];

        // Act
        $result = $this->service->resolveBom($this->model->id, $inputParams);

        // Assert
        $formulas = $result['formulas'];
        $this->assertEquals(2620, $formulas['W1']); // 2500 + 120
        $this->assertEquals(1600, $formulas['H1']); // 1500 + 100
        $this->assertEquals(4.192, $formulas['area']); // 2620 * 1600 / 1000000

        // Check that large case is selected
        $bomItems = $result['bom_items'];
        $caseItem = collect($bomItems)->first(fn($item) => str_contains($item['component_code'], 'CASE'));
        $this->assertEquals('CASE-MEDIUM', $caseItem['component_code']); // 3 < area <= 6

        // Check bracket quantity calculation
        $bracketItem = collect($bomItems)->first(fn($item) => $item['component_code'] === 'BOTTOM-001');
        $this->assertNotNull($bracketItem);
        $this->assertEquals(3, $bracketItem['quantity']); // CEIL(2620 / 1000)
    }

    /** @test */
    public function it_can_resolve_bom_for_maximum_size()
    {
        // Arrange
        $inputParams = [
            'W0' => 3000,
            'H0' => 2000,
            'screen_type' => 'SCREEN',
            'install_type' => 'MIXED',
            'power_source' => 'DC',
        ];

        // Act
        $result = $this->service->resolveBom($this->model->id, $inputParams);

        // Assert
        $formulas = $result['formulas'];
        $this->assertEquals(3120, $formulas['W1']);
        $this->assertEquals(2100, $formulas['H1']);
        $this->assertEquals(6.552, $formulas['area']); // > 6

        // Check that large case is selected
        $bomItems = $result['bom_items'];
        $caseItem = collect($bomItems)->first(fn($item) => str_contains($item['component_code'], 'CASE'));
        $this->assertEquals('CASE-LARGE', $caseItem['component_code']); // area > 6

        // Check motor capacity
        $this->assertEquals('2HP', $formulas['motor']); // area > 6
    }

    /** @test */
    public function it_handles_slat_type_differences()
    {
        // Arrange
        $inputParams = [
            'W0' => 1500,
            'H0' => 1000,
            'screen_type' => 'SLAT',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act
        $result = $this->service->resolveBom($this->model->id, $inputParams);

        // Assert
        $bomItems = $result['bom_items'];

        // Check that SLAT pipe is used instead of SCREEN pipe
        $screenPipe = collect($bomItems)->first(fn($item) => $item['component_code'] === 'PIPE-SCREEN');
        $slatPipe = collect($bomItems)->first(fn($item) => $item['component_code'] === 'PIPE-SLAT');

        $this->assertNull($screenPipe);
        $this->assertNotNull($slatPipe);
    }

    /** @test */
    public function it_validates_input_parameters()
    {
        // Test missing required parameter
        $incompleteParams = [
            'W0' => 1000,
            // Missing H0, screen_type, etc.
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Missing required parameter');

        $this->service->resolveBom($this->model->id, $incompleteParams);
    }

    /** @test */
    public function it_validates_parameter_ranges()
    {
        // Test out-of-range parameter
        $invalidParams = [
            'W0' => 100, // Below minimum (500)
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Parameter W0 value 100 is outside valid range');

        $this->service->resolveBom($this->model->id, $invalidParams);
    }

    /** @test */
    public function it_validates_select_parameter_options()
    {
        // Test invalid select option
        $invalidParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'INVALID_TYPE',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Invalid value for parameter screen_type');

        $this->service->resolveBom($this->model->id, $invalidParams);
    }

    /** @test */
    public function it_can_preview_product_before_creation()
    {
        // Arrange
        $inputParams = [
            'W0' => 1200,
            'H0' => 900,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act
        $preview = $this->service->previewProduct($this->model->id, $inputParams);

        // Assert
        $this->assertArrayHasKey('product_info', $preview);
        $this->assertArrayHasKey('bom_summary', $preview);
        $this->assertArrayHasKey('estimated_cost', $preview);

        $productInfo = $preview['product_info'];
        $this->assertStringContains('KSS01', $productInfo['suggested_code']);
        $this->assertStringContains('1200x900', $productInfo['suggested_name']);

        $bomSummary = $preview['bom_summary'];
        $this->assertArrayHasKey('total_components', $bomSummary);
        $this->assertArrayHasKey('component_categories', $bomSummary);
    }

    /** @test */
    public function it_can_create_product_from_resolved_bom()
    {
        // Arrange
        $inputParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        $productData = [
            'code' => 'KSS01-001',
            'name' => '스크린 블라인드 1000x800',
            'description' => '매개변수 기반 생성 제품',
        ];

        // Act
        $result = $this->service->createProductFromModel($this->model->id, $inputParams, $productData);

        // Assert
        $this->assertArrayHasKey('product', $result);
        $this->assertArrayHasKey('bom_items', $result);

        $product = $result['product'];
        $this->assertEquals('KSS01-001', $product['code']);
        $this->assertEquals('스크린 블라인드 1000x800', $product['name']);

        $bomItems = $result['bom_items'];
        $this->assertGreaterThan(0, count($bomItems));

        // Verify BOM items are properly linked to the product
        foreach ($bomItems as $item) {
            $this->assertEquals($product['id'], $item['product_id']);
            $this->assertNotEmpty($item['component_code']);
            $this->assertGreaterThan(0, $item['quantity']);
        }
    }

    /** @test */
    public function it_handles_formula_evaluation_errors_gracefully()
    {
        // Arrange - Create a formula with invalid expression
        ModelFormula::factory()
            ->create([
                'model_id' => $this->model->id,
                'name' => 'invalid_formula',
                'expression' => 'UNKNOWN_FUNCTION(W0)',
                'sort_order' => 999,
            ]);

        $inputParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act & Assert
        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessage('Formula evaluation failed');

        $this->service->resolveBom($this->model->id, $inputParams);
    }

    /** @test */
    public function it_respects_tenant_isolation()
    {
        // Arrange
        $otherTenantModel = Model::factory()->create(['tenant_id' => 2]);

        $inputParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act & Assert
        $this->expectException(\ModelNotFoundException::class);

        $this->service->resolveBom($otherTenantModel->id, $inputParams);
    }

    /** @test */
    public function it_caches_formula_results_for_performance()
    {
        // Arrange
        $inputParams = [
            'W0' => 1000,
            'H0' => 800,
            'screen_type' => 'SCREEN',
            'install_type' => 'WALL',
            'power_source' => 'AC',
        ];

        // Act - First call
        $start1 = microtime(true);
        $result1 = $this->service->resolveBom($this->model->id, $inputParams);
        $time1 = microtime(true) - $start1;

        // Act - Second call with same parameters
        $start2 = microtime(true);
        $result2 = $this->service->resolveBom($this->model->id, $inputParams);
        $time2 = microtime(true) - $start2;

        // Assert
        $this->assertEquals($result1['formulas'], $result2['formulas']);
        $this->assertEquals($result1['bom_items'], $result2['bom_items']);

        // Second call should be faster due to caching
        $this->assertLessThan($time1, $time2 * 2); // Allow some variance
    }

    /** @test */
    public function it_handles_boundary_conditions_correctly()
    {
        // Test exactly at boundary values
        $boundaryTestCases = [
            // Test area exactly at 3 (boundary between small and medium case)
            [
                'W0' => 1612, // Will result in W1=1732, need H1=1732 for area=3
                'H0' => 1632, // Will result in H1=1732, area = 1732*1732/1000000 ≈ 3
                'expected_case' => 'CASE-SMALL', // area <= 3
            ],
            // Test area exactly at 6 (boundary between medium and large case)
            [
                'W0' => 2329, // Will result in area slightly above 6
                'H0' => 2349,
                'expected_case' => 'CASE-LARGE', // area > 6
            ],
        ];

        foreach ($boundaryTestCases as $testCase) {
            $inputParams = [
                'W0' => $testCase['W0'],
                'H0' => $testCase['H0'],
                'screen_type' => 'SCREEN',
                'install_type' => 'WALL',
                'power_source' => 'AC',
            ];

            $result = $this->service->resolveBom($this->model->id, $inputParams);
            $bomItems = $result['bom_items'];
            $caseItem = collect($bomItems)->first(fn($item) => str_contains($item['component_code'], 'CASE'));

            $this->assertEquals($testCase['expected_case'], $caseItem['component_code'],
                "Failed boundary test for W0={$testCase['W0']}, H0={$testCase['H0']}, area={$result['formulas']['area']}");
        }
    }
}