<?php

namespace Tests\Unit;

use App\Models\BomConditionRule;
use App\Models\Model;
use App\Services\BomConditionRuleService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class BomConditionRuleServiceTest extends TestCase
{
    use RefreshDatabase;

    private BomConditionRuleService $service;
    private Model $model;

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

        $this->model = Model::factory()->screen()->create();
    }

    /** @test */
    public function it_can_get_all_rules_for_model()
    {
        // Arrange
        BomConditionRule::factory()
            ->count(3)
            ->create(['model_id' => $this->model->id]);

        // Act
        $result = $this->service->getRulesByModel($this->model->id);

        // Assert
        $this->assertCount(3, $result);
        $this->assertEquals($this->model->id, $result->first()->model_id);
    }

    /** @test */
    public function it_filters_inactive_rules()
    {
        // Arrange
        BomConditionRule::factory()
            ->active()
            ->create(['model_id' => $this->model->id]);
        BomConditionRule::factory()
            ->inactive()
            ->create(['model_id' => $this->model->id]);

        // Act
        $result = $this->service->getRulesByModel($this->model->id);

        // Assert
        $this->assertCount(1, $result);
        $this->assertTrue($result->first()->is_active);
    }

    /** @test */
    public function it_orders_rules_by_priority()
    {
        // Arrange
        BomConditionRule::factory()
            ->create(['model_id' => $this->model->id, 'priority' => 30, 'name' => 'low']);
        BomConditionRule::factory()
            ->create(['model_id' => $this->model->id, 'priority' => 10, 'name' => 'high']);
        BomConditionRule::factory()
            ->create(['model_id' => $this->model->id, 'priority' => 20, 'name' => 'medium']);

        // Act
        $result = $this->service->getRulesByModel($this->model->id);

        // Assert
        $this->assertEquals('high', $result->get(0)->name);
        $this->assertEquals('medium', $result->get(1)->name);
        $this->assertEquals('low', $result->get(2)->name);
    }

    /** @test */
    public function it_can_create_rule()
    {
        // Arrange
        $data = [
            'name' => 'Test Rule',
            'description' => 'Test description',
            'condition_expression' => 'area > 5',
            'component_code' => 'TEST-001',
            'quantity_expression' => '2',
            'priority' => 50,
        ];

        // Act
        $result = $this->service->createRule($this->model->id, $data);

        // Assert
        $this->assertInstanceOf(BomConditionRule::class, $result);
        $this->assertEquals('Test Rule', $result->name);
        $this->assertEquals('area > 5', $result->condition_expression);
        $this->assertEquals('TEST-001', $result->component_code);
        $this->assertEquals($this->model->id, $result->model_id);
        $this->assertEquals(1, $result->tenant_id);
    }

    /** @test */
    public function it_can_update_rule()
    {
        // Arrange
        $rule = BomConditionRule::factory()
            ->create(['model_id' => $this->model->id, 'name' => 'old_name']);

        $updateData = [
            'name' => 'new_name',
            'condition_expression' => 'area <= 10',
            'priority' => 100,
        ];

        // Act
        $result = $this->service->updateRule($rule->id, $updateData);

        // Assert
        $this->assertEquals('new_name', $result->name);
        $this->assertEquals('area <= 10', $result->condition_expression);
        $this->assertEquals(100, $result->priority);
        $this->assertEquals(1, $result->updated_by);
    }

    /** @test */
    public function it_can_delete_rule()
    {
        // Arrange
        $rule = BomConditionRule::factory()
            ->create(['model_id' => $this->model->id]);

        // Act
        $result = $this->service->deleteRule($rule->id);

        // Assert
        $this->assertTrue($result);
        $this->assertSoftDeleted('bom_condition_rules', ['id' => $rule->id]);
    }

    /** @test */
    public function it_evaluates_simple_conditions()
    {
        // Arrange
        $rule = BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'condition_expression' => 'area > 5',
                'component_code' => 'LARGE-CASE',
                'quantity_expression' => '1',
            ]);

        // Test cases
        $testCases = [
            ['area' => 3, 'expected' => false],
            ['area' => 6, 'expected' => true],
            ['area' => 5, 'expected' => false], // Exactly 5 should be false for > 5
        ];

        foreach ($testCases as $testCase) {
            // Act
            $result = $this->service->evaluateCondition($rule, $testCase);

            // Assert
            $this->assertEquals($testCase['expected'], $result);
        }
    }

    /** @test */
    public function it_evaluates_complex_conditions()
    {
        // Arrange
        $rule = BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'condition_expression' => 'area > 3 AND screen_type = "SCREEN"',
                'component_code' => 'SCREEN-CASE',
                'quantity_expression' => '1',
            ]);

        // Test cases
        $testCases = [
            ['area' => 5, 'screen_type' => 'SCREEN', 'expected' => true],
            ['area' => 5, 'screen_type' => 'SLAT', 'expected' => false],
            ['area' => 2, 'screen_type' => 'SCREEN', 'expected' => false],
            ['area' => 2, 'screen_type' => 'SLAT', 'expected' => false],
        ];

        foreach ($testCases as $testCase) {
            // Act
            $result = $this->service->evaluateCondition($rule, $testCase);

            // Assert
            $this->assertEquals($testCase['expected'], $result,
                "Failed for area={$testCase['area']}, screen_type={$testCase['screen_type']}");
        }
    }

    /** @test */
    public function it_evaluates_quantity_expressions()
    {
        // Test simple quantity
        $rule1 = BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'quantity_expression' => '2',
            ]);

        $result1 = $this->service->evaluateQuantity($rule1, []);
        $this->assertEquals(2, $result1);

        // Test calculated quantity
        $rule2 = BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'quantity_expression' => 'CEIL(W1 / 1000)',
            ]);

        $result2 = $this->service->evaluateQuantity($rule2, ['W1' => 2500]);
        $this->assertEquals(3, $result2); // ceil(2500/1000) = 3

        // Test formula-based quantity
        $rule3 = BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'quantity_expression' => 'W1 / 1000',
            ]);

        $result3 = $this->service->evaluateQuantity($rule3, ['W1' => 1500]);
        $this->assertEquals(1.5, $result3);
    }

    /** @test */
    public function it_applies_rules_in_priority_order()
    {
        // Arrange - Create rules with different priorities
        $rules = [
            BomConditionRule::factory()
                ->create([
                    'model_id' => $this->model->id,
                    'name' => 'High Priority Rule',
                    'condition_expression' => 'TRUE',
                    'component_code' => 'HIGH-PRIORITY',
                    'quantity_expression' => '1',
                    'priority' => 10,
                ]),
            BomConditionRule::factory()
                ->create([
                    'model_id' => $this->model->id,
                    'name' => 'Low Priority Rule',
                    'condition_expression' => 'TRUE',
                    'component_code' => 'LOW-PRIORITY',
                    'quantity_expression' => '1',
                    'priority' => 50,
                ]),
            BomConditionRule::factory()
                ->create([
                    'model_id' => $this->model->id,
                    'name' => 'Medium Priority Rule',
                    'condition_expression' => 'TRUE',
                    'component_code' => 'MEDIUM-PRIORITY',
                    'quantity_expression' => '1',
                    'priority' => 30,
                ]),
        ];

        // Act
        $appliedRules = $this->service->applyRules($this->model->id, []);

        // Assert
        $this->assertCount(3, $appliedRules);
        $this->assertEquals('HIGH-PRIORITY', $appliedRules[0]['component_code']);
        $this->assertEquals('MEDIUM-PRIORITY', $appliedRules[1]['component_code']);
        $this->assertEquals('LOW-PRIORITY', $appliedRules[2]['component_code']);
    }

    /** @test */
    public function it_skips_rules_with_false_conditions()
    {
        // Arrange
        BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'name' => 'Should Apply',
                'condition_expression' => 'area > 3',
                'component_code' => 'SHOULD-APPLY',
                'quantity_expression' => '1',
                'priority' => 10,
            ]);

        BomConditionRule::factory()
            ->create([
                'model_id' => $this->model->id,
                'name' => 'Should Skip',
                'condition_expression' => 'area <= 3',
                'component_code' => 'SHOULD-SKIP',
                'quantity_expression' => '1',
                'priority' => 20,
            ]);

        // Act
        $appliedRules = $this->service->applyRules($this->model->id, ['area' => 5]);

        // Assert
        $this->assertCount(1, $appliedRules);
        $this->assertEquals('SHOULD-APPLY', $appliedRules[0]['component_code']);
    }

    /** @test */
    public function it_validates_condition_syntax()
    {
        // Test valid conditions
        $validConditions = [
            'TRUE',
            'FALSE',
            'area > 5',
            'area >= 5 AND W0 < 2000',
            'screen_type = "SCREEN"',
            'install_type != "WALL"',
            '(area > 3 AND screen_type = "SCREEN") OR install_type = "SIDE"',
        ];

        foreach ($validConditions as $condition) {
            $isValid = $this->service->validateConditionSyntax($condition);
            $this->assertTrue($isValid, "Condition should be valid: {$condition}");
        }

        // Test invalid conditions
        $invalidConditions = [
            'area > > 5',              // Double operator
            'area AND',                // Incomplete expression
            'unknown_var > 5',         // Unknown variable (if validation is strict)
            'area = "invalid"',        // Type mismatch
            '',                        // Empty condition
        ];

        foreach ($invalidConditions as $condition) {
            $isValid = $this->service->validateConditionSyntax($condition);
            $this->assertFalse($isValid, "Condition should be invalid: {$condition}");
        }
    }

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

        // Act
        $result = $this->service->getRulesByModel($otherTenantModel->id);

        // Assert
        $this->assertCount(0, $result);
    }

    /** @test */
    public function it_can_bulk_update_rules()
    {
        // Arrange
        $rules = BomConditionRule::factory()
            ->count(3)
            ->create(['model_id' => $this->model->id]);

        $updateData = [
            [
                'id' => $rules[0]->id,
                'name' => 'updated_rule_1',
                'priority' => 5,
            ],
            [
                'id' => $rules[1]->id,
                'condition_expression' => 'area > 10',
                'priority' => 15,
            ],
            [
                'id' => $rules[2]->id,
                'is_active' => false,
            ],
        ];

        // Act
        $result = $this->service->bulkUpdateRules($this->model->id, $updateData);

        // Assert
        $this->assertTrue($result);

        $updated = BomConditionRule::whereIn('id', $rules->pluck('id'))->get();
        $this->assertEquals('updated_rule_1', $updated->where('id', $rules[0]->id)->first()->name);
        $this->assertEquals('area > 10', $updated->where('id', $rules[1]->id)->first()->condition_expression);
        $this->assertFalse($updated->where('id', $rules[2]->id)->first()->is_active);
    }

    /** @test */
    public function it_handles_complex_kss01_scenario()
    {
        // Arrange - Create KSS01 rules
        $rules = BomConditionRule::factory()
            ->screenRules()
            ->create(['model_id' => $this->model->id]);

        // Small screen test case
        $smallScreenParams = [
            'W0' => 1000,
            'H0' => 800,
            'W1' => 1120,
            'H1' => 900,
            'area' => 1.008,
            'screen_type' => 'SCREEN',
        ];

        // Act
        $appliedRules = $this->service->applyRules($this->model->id, $smallScreenParams);

        // Assert
        $this->assertGreaterThan(0, count($appliedRules));

        // Check that case rule is applied correctly (small case for area <= 3)
        $caseRule = collect($appliedRules)->first(fn($rule) => str_contains($rule['component_code'], 'CASE'));
        $this->assertNotNull($caseRule);
        $this->assertEquals('CASE-SMALL', $caseRule['component_code']);

        // Check that screen-specific pipe is applied
        $pipeRule = collect($appliedRules)->first(fn($rule) => $rule['component_code'] === 'PIPE-SCREEN');
        $this->assertNotNull($pipeRule);

        // Check that slat-specific pipe is NOT applied
        $slatPipeRule = collect($appliedRules)->first(fn($rule) => $rule['component_code'] === 'PIPE-SLAT');
        $this->assertNull($slatPipeRule);
    }
}