/**
 * Standalone Dimension Validation Service Test Runner
 * Runs dimension validation tests without Jest environment issues
 */

const dimensionService = require('./services/dimensionValidationService');

// Mock console for test output
const testResults = [];

function mockTest(name, testFn) {
  return new Promise(async (resolve) => {
    try {
      await testFn();
      testResults.push({ name, status: 'PASS' });
      console.log(`✓ ${name}`);
      resolve();
    } catch (error) {
      testResults.push({ name, status: 'FAIL', error: error.message });
      console.log(`✗ ${name}: ${error.message}`);
      resolve();
    }
  });
}

function mockDescribe(name, describeFn) {
  console.log(`\n${name}`);
  return describeFn();
}

function mockExpected(actual) {
  const expectObj = {
    toBe: (expected) => {
      if (actual !== expected) {
        throw new Error(`Expected ${expected}, got ${actual}`);
      }
    },
    toBeCloseTo: (expected, precision = 2) => {
      const diff = Math.abs(actual - expected);
      const threshold = Math.pow(10, -precision) / 2;
      if (diff >= threshold) {
        throw new Error(`Expected ${actual} to be close to ${expected} (precision: ${precision})`);
      }
    },
    toBeDefined: () => {
      if (actual === undefined) {
        throw new Error('Expected value to be defined');
      }
    },
    toBeUndefined: () => {
      if (actual !== undefined) {
        throw new Error(`Expected undefined, got ${actual}`);
      }
    },
    toBeNull: () => {
      if (actual !== null) {
        throw new Error(`Expected null, got ${actual}`);
      }
    },
    toBeGreaterThan: (expected) => {
      if (actual <= expected) {
        throw new Error(`Expected ${actual} to be greater than ${expected}`);
      }
    },
    toContain: (expected) => {
      if (typeof actual === 'string') {
        if (!actual.includes(expected)) {
          throw new Error(`Expected string to contain "${expected}"`);
        }
      } else if (Array.isArray(actual)) {
        if (!actual.includes(expected)) {
          throw new Error(`Expected array to contain ${expected}`);
        }
      } else {
        throw new Error('toContain can only be used with strings or arrays');
      }
    },
    toEqual: (expected) => {
      if (JSON.stringify(actual) !== JSON.stringify(expected)) {
        throw new Error(`Expected ${JSON.stringify(expected)}, got ${JSON.stringify(actual)}`);
      }
    },
    toHaveLength: (expected) => {
      if (!Array.isArray(actual) || actual.length !== expected) {
        throw new Error(`Expected array of length ${expected}, got ${actual ? actual.length : 'not an array'}`);
      }
    }
  };
  
  return expectObj;
}

// Set up global test functions
global.describe = mockDescribe;
global.test = mockTest;
global.expect = mockExpected;

// Run dimension validation tests
async function runDimensionValidationTests() {
  console.log('Running Dimension Validation Service Tests...\n');
  
  // Test 1: Basic validation functions
  await mockTest('should validate RM product dimension requirements', async () => {
    const rmProduct = {
      product_type: 'RM',
      track_by_dimensions: true,
      unit_of_measure: 'm'
    };
    
    const result = dimensionService.validateProductDimensionRequirement(rmProduct);
    expect(result.isValid).toBe(true);
    expect(result.requiresDimensions).toBe(true);
    expect(result.unit).toBe('m');
  });

  await mockTest('should reject RM product without dimension tracking', async () => {
    const rmProduct = {
      product_type: 'RM',
      track_by_dimensions: false,
      unit_of_measure: 'm'
    };
    
    const result = dimensionService.validateProductDimensionRequirement(rmProduct);
    expect(result.isValid).toBe(false);
    expect(result.error).toContain('track_by_dimensions');
  });

  await mockTest('should validate positive dimensions', async () => {
    const result = dimensionService.validateDimensions(5.0, 3.0, 'm');
    expect(result.isValid).toBe(true);
  });

  await mockTest('should reject negative dimensions', async () => {
    const result = dimensionService.validateDimensions(-1.0, 3.0, 'm');
    expect(result.isValid).toBe(false);
    expect(result.errors[0]).toContain('Length must be positive');
  });

  // Test 2: Unit conversion
  await mockTest('should convert meters to centimeters correctly', async () => {
    const result = dimensionService.convertUnit(1.0, 'm', 'cm');
    expect(result.isValid).toBe(true);
    expect(result.value).toBeCloseTo(100.0, 6);
  });

  await mockTest('should convert inches to meters correctly', async () => {
    const result = dimensionService.convertUnit(39.3701, 'inch', 'm');
    expect(result.isValid).toBe(true);
    expect(result.value).toBeCloseTo(1.0, 3);
  });

  await mockTest('should convert dimension objects', async () => {
    const dimensions = { length: 2.0, width: 1.5, unit: 'm' };
    const result = dimensionService.convertDimensions(dimensions, 'cm');
    
    expect(result.isValid).toBe(true);
    expect(result.dimensions.length).toBeCloseTo(200.0, 6);
    expect(result.dimensions.width).toBeCloseTo(150.0, 6);
    expect(result.dimensions.unit).toBe('cm');
  });

  // Test 3: Area calculation
  await mockTest('should calculate area correctly', async () => {
    const result = dimensionService.calculateArea(4.0, 3.0, 'm');
    expect(result.isValid).toBe(true);
    expect(result.area).toBe(12.0);
    expect(result.areaUnit).toBe('m²');
  });

  // Test 4: Dimension sufficiency
  await mockTest('should check if available dimensions can satisfy requirements', async () => {
    const available = { length: 6.0, width: 4.0, unit: 'm' };
    const required = { length: 3.0, width: 2.0, unit: 'm' };
    
    const result = dimensionService.checkDimensionSufficiency(available, required);
    expect(result.isValid).toBe(true);
    expect(result.canFit).toBe(true);
    expect(result.remainingDimensions.length).toBe(3.0);
    expect(result.remainingDimensions.width).toBe(2.0);
  });

  await mockTest('should handle insufficient dimensions', async () => {
    const available = { length: 2.0, width: 1.0, unit: 'm' };
    const required = { length: 3.0, width: 2.0, unit: 'm' };
    
    const result = dimensionService.checkDimensionSufficiency(available, required);
    expect(result.isValid).toBe(true);
    expect(result.canFit).toBe(false);
    expect(result.shortfall.length).toBe(1.0);
    expect(result.shortfall.width).toBe(1.0);
  });

  // Test 5: Property-based test for RM validation (simplified)
  await mockTest('Property 1: RM Dimension Validation (100 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 100; i++) {
      const productData = {
        product_type: Math.random() < 0.5 ? 'RM' : 'FG',
        track_by_dimensions: Math.random() < 0.5,
        unit_of_measure: ['inch', 'cm', 'm', null, undefined][Math.floor(Math.random() * 5)]
      };
      
      const result = dimensionService.validateProductDimensionRequirement(productData);
      
      // Property 1.1: RM products with proper setup should be valid
      if (productData.product_type === 'RM' && 
          productData.track_by_dimensions === true && 
          ['inch', 'cm', 'm'].includes(productData.unit_of_measure)) {
        if (result.isValid !== true || result.requiresDimensions !== true || result.unit !== productData.unit_of_measure) {
          throw new Error(`RM validation failed at iteration ${i}`);
        }
      }
      
      // Property 1.2: RM products without proper setup should be invalid
      if (productData.product_type === 'RM' && 
          (productData.track_by_dimensions !== true || 
           !['inch', 'cm', 'm'].includes(productData.unit_of_measure))) {
        if (result.isValid !== false || !result.error) {
          throw new Error(`RM validation should have failed at iteration ${i}`);
        }
      }
      
      // Property 1.3: Non-RM products should not require dimensions
      if (productData.product_type !== 'RM') {
        if (result.isValid !== true || result.requiresDimensions !== false) {
          throw new Error(`Non-RM validation failed at iteration ${i}`);
        }
      }
      
      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/100 iterations`);
  });

  // Test 6: Property-based test for unit conversion (simplified)
  await mockTest('Property 7: Unit Conversion Accuracy (100 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 100; i++) {
      const convData = {
        value: Math.random() * 99.999 + 0.001, // 0.001 to 100.0
        fromUnit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)],
        toUnit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)]
      };
      
      const result1 = dimensionService.convertUnit(convData.value, convData.fromUnit, convData.toUnit);
      
      // Property 7.1: Valid conversions should succeed
      if (!result1.isValid || result1.value <= 0 || result1.originalValue !== convData.value) {
        throw new Error(`Conversion validation failed at iteration ${i}`);
      }
      
      // Property 7.2: Reverse conversion should return original value
      const result2 = dimensionService.convertUnit(result1.value, convData.toUnit, convData.fromUnit);
      if (!result2.isValid || Math.abs(result2.value - convData.value) > 0.000001) {
        throw new Error(`Reverse conversion failed at iteration ${i}`);
      }
      
      // Property 7.3: Same unit conversion should return same value
      if (convData.fromUnit === convData.toUnit && Math.abs(result1.value - convData.value) > 0.000001) {
        throw new Error(`Same unit conversion failed at iteration ${i}`);
      }
      
      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/100 iterations`);
  });

  // Test 7: Property-based test for dimension sufficiency (simplified)
  await mockTest('Property 6: Dimension Sufficiency Check (100 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 100; i++) {
      const data = {
        availableLength: Math.random() * 19.9 + 0.1, // 0.1 to 20.0
        availableWidth: Math.random() * 19.9 + 0.1,
        requiredLength: Math.random() * 19.9 + 0.1,
        requiredWidth: Math.random() * 19.9 + 0.1,
        availableUnit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)],
        requiredUnit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)]
      };
      
      const available = {
        length: data.availableLength,
        width: data.availableWidth,
        unit: data.availableUnit
      };
      
      const required = {
        length: data.requiredLength,
        width: data.requiredWidth,
        unit: data.requiredUnit
      };
      
      const result = dimensionService.checkDimensionSufficiency(available, required);
      
      // Property 6.1: Sufficiency check should always succeed for valid inputs
      if (!result.isValid) {
        throw new Error(`Sufficiency check failed at iteration ${i}`);
      }
      
      // Property 6.2: Convert required to available unit for comparison
      const convertedRequired = dimensionService.convertDimensions(required, data.availableUnit);
      if (!convertedRequired.isValid) {
        throw new Error(`Unit conversion failed at iteration ${i}`);
      }
      
      const reqLength = convertedRequired.dimensions.length;
      const reqWidth = convertedRequired.dimensions.width;
      
      // Property 6.3: Fit determination should be mathematically correct
      const expectedCanFit = data.availableLength >= reqLength && data.availableWidth >= reqWidth;
      if (result.canFit !== expectedCanFit) {
        throw new Error(`Fit determination incorrect at iteration ${i}`);
      }
      
      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/100 iterations`);
  });

  return testResults;
}

// Run the tests
runDimensionValidationTests().then((results) => {
  console.log('\n=== Dimension Validation Service Test Results ===');
  const passed = results.filter(r => r.status === 'PASS').length;
  const failed = results.filter(r => r.status === 'FAIL').length;
  
  console.log(`Passed: ${passed}`);
  console.log(`Failed: ${failed}`);
  console.log(`Total: ${results.length}`);
  
  if (failed > 0) {
    console.log('\nFailed tests:');
    results.filter(r => r.status === 'FAIL').forEach(r => {
      console.log(`- ${r.name}: ${r.error}`);
    });
  }
  
  process.exit(failed === 0 ? 0 : 1);
}).catch(error => {
  console.error('Test runner error:', error);
  process.exit(1);
});