/**
 * Standalone BOMItem Test Runner
 * Runs BOMItem tests without Jest environment issues
 */

const fc = require('fast-check');

// 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');
      }
    },
    toBeNull: () => {
      if (actual !== null) {
        throw new Error(`Expected null, got ${actual}`);
      }
    },
    toBeLessThan: (expected) => {
      if (actual >= expected) {
        throw new Error(`Expected ${actual} to be less than ${expected}`);
      }
    },
    toBeLessThanOrEqual: (expected) => {
      if (actual > expected) {
        throw new Error(`Expected ${actual} to be less than or equal to ${expected}`);
      }
    },
    toBeGreaterThan: (expected) => {
      if (actual <= expected) {
        throw new Error(`Expected ${actual} to be greater than ${expected}`);
      }
    },
    toContain: (expected) => {
      if (!Array.isArray(actual) || !actual.includes(expected)) {
        throw new Error(`Expected array to contain ${expected}`);
      }
    },
    rejects: {
      toThrow: async (expectedMessage) => {
        try {
          await actual;
          throw new Error('Expected function to throw, but it did not');
        } catch (error) {
          if (expectedMessage && !error.message.includes(expectedMessage)) {
            throw new Error(`Expected error message to contain "${expectedMessage}", got "${error.message}"`);
          }
        }
      }
    }
  };
  
  return expectObj;
}

// Set up global test functions
global.describe = mockDescribe;
global.test = mockTest;
global.expect = mockExpected;
global.beforeAll = (fn) => fn();
global.afterAll = (fn) => fn();
global.beforeEach = (fn) => fn();

// Mock related models
const mockBOM = { id: 1, fg_product_id: 1 };
const mockRMProduct = { id: 2, product_type: 'RM', track_by_dimensions: true, unit_of_measure: 'm' };

// Create mock instance with validation
const createMockBOMItemInstance = (data) => {
  const instance = { ...data };
  
  // Add validation logic
  const validate = () => {
    if (!instance.bom_id || !instance.rm_product_id || !instance.quantity_per_unit) {
      throw new Error('Missing required fields');
    }
    
    if (instance.quantity_per_unit <= 0) {
      throw new Error('Quantity per unit must be positive');
    }
    
    // Dimension-based validation
    if (instance.use_dimensions === true) {
      if (!instance.required_length || !instance.required_width || !instance.dimension_unit) {
        throw new Error('Dimension-based BOM items must have required_length, required_width, and dimension_unit');
      }
      
      if (instance.required_length <= 0 || instance.required_width <= 0) {
        throw new Error('Required dimensions must be positive');
      }
      
      if (!['inch', 'cm', 'm'].includes(instance.dimension_unit)) {
        throw new Error('Invalid dimension unit');
      }
    }
    
    // Validate dimension requirements consistency
    if ((instance.required_length !== null && instance.required_length !== undefined) || 
        (instance.required_width !== null && instance.required_width !== undefined) || 
        (instance.dimension_unit !== null && instance.dimension_unit !== undefined)) {
      if (!instance.use_dimensions) {
        throw new Error('Dimension fields require use_dimensions to be TRUE');
      }
    }
  };
  
  // Add instance methods
  instance.getRequiredArea = function() {
    if (!this.use_dimensions || !this.required_length || !this.required_width) {
      return null;
    }
    return parseFloat(this.required_length) * parseFloat(this.required_width);
  };
  
  instance.calculateTotalAreaRequired = function(productionQuantity) {
    const areaPerUnit = this.getRequiredArea();
    if (areaPerUnit === null) {
      return null;
    }
    return areaPerUnit * productionQuantity;
  };
  
  instance.isDimensionBased = function() {
    return this.use_dimensions === true;
  };
  
  instance.isQuantityBased = function() {
    return this.use_dimensions === false || this.use_dimensions === null;
  };
  
  instance.canFitInPiece = function(pieceLength, pieceWidth, pieceUnit = 'm') {
    if (!this.use_dimensions) {
      return null; // Cannot determine for quantity-based items
    }
    
    // For simplicity, assume same unit (unit conversion would be added later)
    if (pieceUnit !== this.dimension_unit) {
      return null; // Unit conversion needed
    }
    
    return pieceLength >= this.required_length && pieceWidth >= this.required_width;
  };
  
  instance.destroy = async function() {
    return true;
  };
  
  // Set defaults
  instance.use_dimensions = instance.use_dimensions || false;
  instance.id = Math.floor(Math.random() * 1000);
  
  // Validate on creation
  validate();
  
  return instance;
};

// Mock BOMItem model
const mockBOMItem = {
  create: async (data) => {
    const instance = createMockBOMItemInstance(data);
    return instance;
  }
};

// Run BOMItem tests
async function runBOMItemTests() {
  console.log('Running BOMItem Property Tests...\n');
  
  const testBOM = mockBOM;
  const testRMProduct = mockRMProduct;
  
  // Test 1: Basic functionality
  await mockTest('should create quantity-based BOM item', async () => {
    const bomItem = await mockBOMItem.create({
      bom_id: testBOM.id,
      rm_product_id: testRMProduct.id,
      quantity_per_unit: 2.5,
      use_dimensions: false
    });

    expect(bomItem).toBeDefined();
    expect(bomItem.bom_id).toBe(testBOM.id);
    expect(bomItem.quantity_per_unit).toBe(2.5);
    expect(bomItem.use_dimensions).toBe(false);
    expect(bomItem.isQuantityBased()).toBe(true);
    expect(bomItem.isDimensionBased()).toBe(false);
  });

  await mockTest('should create dimension-based BOM item', async () => {
    const bomItem = await mockBOMItem.create({
      bom_id: testBOM.id,
      rm_product_id: testRMProduct.id,
      quantity_per_unit: 1.0,
      use_dimensions: true,
      required_length: 2.0,
      required_width: 1.5,
      dimension_unit: 'm'
    });

    expect(bomItem).toBeDefined();
    expect(bomItem.use_dimensions).toBe(true);
    expect(bomItem.required_length).toBe(2.0);
    expect(bomItem.required_width).toBe(1.5);
    expect(bomItem.dimension_unit).toBe('m');
    expect(bomItem.isDimensionBased()).toBe(true);
    expect(bomItem.isQuantityBased()).toBe(false);
  });

  // Test 2: Property-based test for dimension consistency
  await mockTest('Property 4.1: Dimension flag consistency (100 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 100; i++) {
      const data = {
        quantity_per_unit: Math.random() * 99.9 + 0.1, // 0.1 to 100.0
        use_dimensions: Math.random() < 0.5, // Random boolean
        required_length: Math.random() * 9.9 + 0.1, // 0.1 to 10.0
        required_width: Math.random() * 9.9 + 0.1, // 0.1 to 10.0
        dimension_unit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)]
      };
      
      const bomItemData = {
        bom_id: testBOM.id,
        rm_product_id: testRMProduct.id,
        quantity_per_unit: data.quantity_per_unit,
        use_dimensions: data.use_dimensions
      };

      // Add dimension fields only if use_dimensions is true
      if (data.use_dimensions) {
        bomItemData.required_length = data.required_length;
        bomItemData.required_width = data.required_width;
        bomItemData.dimension_unit = data.dimension_unit;
      }

      const bomItem = await mockBOMItem.create(bomItemData);

      // Property 4.1: Dimension flag consistency
      if (bomItem.isDimensionBased() !== data.use_dimensions) {
        throw new Error(`Dimension flag inconsistency at iteration ${i}`);
      }
      if (bomItem.isQuantityBased() !== !data.use_dimensions) {
        throw new Error(`Quantity flag inconsistency at iteration ${i}`);
      }

      // Property 4.2: Dimension requirements are set correctly
      if (data.use_dimensions) {
        if (Math.abs(bomItem.required_length - data.required_length) > 0.001) {
          throw new Error(`Length mismatch at iteration ${i}`);
        }
        if (Math.abs(bomItem.required_width - data.required_width) > 0.001) {
          throw new Error(`Width mismatch at iteration ${i}`);
        }
        if (bomItem.dimension_unit !== data.dimension_unit) {
          throw new Error(`Unit mismatch at iteration ${i}`);
        }
        
        // Property 4.3: Area calculation is consistent
        const expectedArea = data.required_length * data.required_width;
        if (Math.abs(bomItem.getRequiredArea() - expectedArea) > 0.000001) {
          throw new Error(`Area calculation inconsistency at iteration ${i}`);
        }
      } else {
        if (bomItem.getRequiredArea() !== null) {
          throw new Error(`Non-null area for quantity-based item at iteration ${i}`);
        }
      }

      // Property 4.4: Production scaling works correctly
      if (data.use_dimensions) {
        const productionQuantity = Math.floor(Math.random() * 20) + 1;
        const expectedTotalArea = bomItem.getRequiredArea() * productionQuantity;
        if (Math.abs(bomItem.calculateTotalAreaRequired(productionQuantity) - expectedTotalArea) > 0.000001) {
          throw new Error(`Production scaling inconsistency at iteration ${i}`);
        }
      }

      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/100 iterations`);
  });

  // Test 3: Property-based test for piece fitting
  await mockTest('Property 4.5: Piece fitting logic (100 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 100; i++) {
      const data = {
        required_length: Math.random() * 4.0 + 1.0, // 1.0 to 5.0
        required_width: Math.random() * 4.0 + 1.0, // 1.0 to 5.0
        piece_length: Math.random() * 9.5 + 0.5, // 0.5 to 10.0
        piece_width: Math.random() * 9.5 + 0.5, // 0.5 to 10.0
        dimension_unit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)]
      };
      
      const bomItem = await mockBOMItem.create({
        bom_id: testBOM.id,
        rm_product_id: testRMProduct.id,
        quantity_per_unit: 1.0,
        use_dimensions: true,
        required_length: data.required_length,
        required_width: data.required_width,
        dimension_unit: data.dimension_unit
      });

      const canFit = bomItem.canFitInPiece(data.piece_length, data.piece_width, data.dimension_unit);

      // Property 4.5: Piece fitting logic is correct
      const expectedCanFit = data.piece_length >= data.required_length && data.piece_width >= data.required_width;
      if (canFit !== expectedCanFit) {
        throw new Error(`Piece fitting logic error at iteration ${i}: expected ${expectedCanFit}, got ${canFit}`);
      }

      // Property 4.6: Edge cases are handled correctly
      const exactFit = bomItem.canFitInPiece(data.required_length, data.required_width, data.dimension_unit);
      if (exactFit !== true) {
        throw new Error(`Exact fit should be true at iteration ${i}`);
      }

      if (data.required_length > 0.1 && data.required_width > 0.1) {
        const tooSmall = bomItem.canFitInPiece(data.required_length - 0.1, data.required_width - 0.1, data.dimension_unit);
        if (tooSmall !== false) {
          throw new Error(`Too small piece should not fit at iteration ${i}`);
        }
      }

      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/100 iterations`);
  });

  // Test 4: Mixed BOM scenarios
  await mockTest('Property 4.7: Mixed BOM scenarios (50 iterations)', async () => {
    let passedIterations = 0;
    
    for (let i = 0; i < 50; i++) {
      const bomItemsCount = Math.floor(Math.random() * 4) + 1; // 1 to 5 items
      const bomItems = [];
      
      for (let j = 0; j < bomItemsCount; j++) {
        const data = {
          use_dimensions: Math.random() < 0.5,
          quantity_per_unit: Math.random() * 9.9 + 0.1, // 0.1 to 10.0
          required_length: Math.random() * 4.5 + 0.5, // 0.5 to 5.0
          required_width: Math.random() * 4.5 + 0.5, // 0.5 to 5.0
          dimension_unit: ['inch', 'cm', 'm'][Math.floor(Math.random() * 3)]
        };
        
        const bomItemData = {
          bom_id: testBOM.id,
          rm_product_id: testRMProduct.id,
          quantity_per_unit: data.quantity_per_unit,
          use_dimensions: data.use_dimensions
        };

        if (data.use_dimensions) {
          bomItemData.required_length = data.required_length;
          bomItemData.required_width = data.required_width;
          bomItemData.dimension_unit = data.dimension_unit;
        }

        const bomItem = await mockBOMItem.create(bomItemData);
        bomItems.push(bomItem);
      }

      // Property 4.7: Mixed BOM support works correctly
      const dimensionBasedItems = bomItems.filter(item => item.isDimensionBased());
      const quantityBasedItems = bomItems.filter(item => item.isQuantityBased());

      if (dimensionBasedItems.length + quantityBasedItems.length !== bomItems.length) {
        throw new Error(`Item count mismatch at iteration ${i}`);
      }

      // Property 4.8: Each item type behaves correctly
      for (const item of dimensionBasedItems) {
        if (item.getRequiredArea() <= 0) {
          throw new Error(`Dimension-based item should have positive area at iteration ${i}`);
        }
        if (item.required_length <= 0 || item.required_width <= 0) {
          throw new Error(`Dimension-based item should have positive dimensions at iteration ${i}`);
        }
        if (!['inch', 'cm', 'm'].includes(item.dimension_unit)) {
          throw new Error(`Invalid dimension unit at iteration ${i}`);
        }
      }

      for (const item of quantityBasedItems) {
        if (item.getRequiredArea() !== null) {
          throw new Error(`Quantity-based item should have null area at iteration ${i}`);
        }
        if (item.canFitInPiece(5.0, 5.0, 'm') !== null) {
          throw new Error(`Quantity-based item should return null for piece fitting at iteration ${i}`);
        }
      }

      passedIterations++;
    }
    
    console.log(`    Passed ${passedIterations}/50 iterations`);
  });

  return testResults;
}

// Run the tests
runBOMItemTests().then((results) => {
  console.log('\n=== BOMItem Property 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);
});