import { tap, expect } from '@git.zone/tstest/tapbundle';
import { EInvoice } from '../../../ts/index.js';
import { ValidationLevel } from '../../../ts/interfaces/common.js';
import { CorpusLoader, PerformanceTracker } from '../../helpers/test-utils.js';
import * as path from 'path';

/**
 * Test ID: CORP-06
 * Test Description: EN16931 Test Suite Execution
 * Priority: High
 * 
 * This test executes the official EN16931 validation test suite
 * to ensure compliance with the European e-invoicing standard.
 */

tap.test('CORP-06: EN16931 Test Suite Execution - should validate against EN16931 test cases', async (t) => {
  // Load EN16931 test files
  const en16931Files = await CorpusLoader.loadCategory('EN16931_TEST_CASES');
  
  console.log(`Testing ${en16931Files.length} EN16931 test cases`);
  
  const results = {
    total: en16931Files.length,
    passed: 0,
    failed: 0,
    ruleCategories: new Map<string, { passed: number; failed: number }>(),
    processingTimes: [] as number[],
    businessRules: { passed: 0, failed: 0 },
    codelistRules: { passed: 0, failed: 0 },
    calculationRules: { passed: 0, failed: 0 },
    syntaxRules: { passed: 0, failed: 0 }
  };
  
  const failures: Array<{
    file: string;
    rule: string;
    expected: 'pass' | 'fail';
    actual: 'pass' | 'fail';
    error?: string;
  }> = [];
  
  for (const file of en16931Files) {
    const filename = path.basename(file.path);
    
    // Determine expected result and rule from filename
    // EN16931 test files typically follow pattern: BR-XX.xml, BR-CL-XX.xml, BR-CO-XX.xml
    const ruleMatch = filename.match(/^(BR|BR-CL|BR-CO|BR-[A-Z]+)-(\d+)/);
    const rule = ruleMatch ? ruleMatch[0] : 'unknown';
    const ruleCategory = ruleMatch ? ruleMatch[1] : 'unknown';
    
    // Some test files are designed to fail validation
    const shouldFail = filename.includes('fail') || filename.includes('invalid');
    
    try {
      const xmlBuffer = await CorpusLoader.loadFile(file.path);
      const xmlString = xmlBuffer.toString('utf-8');
      
      // Track performance
      const { result: invoice, metric } = await PerformanceTracker.track(
        'en16931-validation',
        async () => {
          const einvoice = new EInvoice();
          await einvoice.fromXmlString(xmlString);
          return einvoice;
        },
        { file: file.path, rule, size: file.size }
      );
      
      results.processingTimes.push(metric.duration);
      
      // Validate against EN16931 rules
      const validationResult = await invoice.validate(ValidationLevel.EN16931);
      
      // Track rule category
      if (!results.ruleCategories.has(ruleCategory)) {
        results.ruleCategories.set(ruleCategory, { passed: 0, failed: 0 });
      }
      
      // Categorize rules
      if (ruleCategory === 'BR-CL') {
        if (validationResult.valid) results.codelistRules.passed++;
        else results.codelistRules.failed++;
      } else if (ruleCategory === 'BR-CO') {
        if (validationResult.valid) results.calculationRules.passed++;
        else results.calculationRules.failed++;
      } else if (ruleCategory === 'BR') {
        if (validationResult.valid) results.businessRules.passed++;
        else results.businessRules.failed++;
      } else {
        if (validationResult.valid) results.syntaxRules.passed++;
        else results.syntaxRules.failed++;
      }
      
      // Check if result matches expectation
      const actuallyFailed = !validationResult.valid;
      
      if (shouldFail === actuallyFailed) {
        results.passed++;
        const category = results.ruleCategories.get(ruleCategory)!;
        category.passed++;
        
        t.pass(`✓ ${filename} [${rule}]: ${shouldFail ? 'Failed as expected' : 'Passed as expected'}`);
        
        if (actuallyFailed && validationResult.errors?.length) {
          t.pass(`  - Error: ${validationResult.errors[0].message}`);
        }
      } else {
        results.failed++;
        const category = results.ruleCategories.get(ruleCategory)!;
        category.failed++;
        
        failures.push({
          file: filename,
          rule,
          expected: shouldFail ? 'fail' : 'pass',
          actual: actuallyFailed ? 'fail' : 'pass',
          error: validationResult.errors?.[0]?.message
        });
        
        t.fail(`✗ ${filename} [${rule}]: Expected to ${shouldFail ? 'fail' : 'pass'} but ${actuallyFailed ? 'failed' : 'passed'}`);
      }
      
    } catch (error: any) {
      // Parse errors might be expected for some test cases
      if (shouldFail) {
        results.passed++;
        t.pass(`✓ ${filename} [${rule}]: Failed to parse as expected`);
      } else {
        results.failed++;
        failures.push({
          file: filename,
          rule,
          expected: 'pass',
          actual: 'fail',
          error: error.message
        });
        t.fail(`✗ ${filename} [${rule}]: Unexpected parse error`);
      }
    }
  }
  
  // Summary report
  console.log('\n=== EN16931 Test Suite Execution Summary ===');
  console.log(`Total test cases: ${results.total}`);
  console.log(`Passed: ${results.passed} (${(results.passed/results.total*100).toFixed(1)}%)`);
  console.log(`Failed: ${results.failed}`);
  
  console.log('\nRule Categories:');
  results.ruleCategories.forEach((stats, category) => {
    const total = stats.passed + stats.failed;
    console.log(`  ${category}: ${stats.passed}/${total} passed (${(stats.passed/total*100).toFixed(1)}%)`);
  });
  
  console.log('\nRule Types:');
  console.log(`  Business Rules (BR): ${results.businessRules.passed}/${results.businessRules.passed + results.businessRules.failed} passed`);
  console.log(`  Codelist Rules (BR-CL): ${results.codelistRules.passed}/${results.codelistRules.passed + results.codelistRules.failed} passed`);
  console.log(`  Calculation Rules (BR-CO): ${results.calculationRules.passed}/${results.calculationRules.passed + results.calculationRules.failed} passed`);
  console.log(`  Syntax Rules: ${results.syntaxRules.passed}/${results.syntaxRules.passed + results.syntaxRules.failed} passed`);
  
  if (failures.length > 0) {
    console.log('\nFailure Details (first 10):');
    failures.slice(0, 10).forEach(f => {
      console.log(`  ${f.file} [${f.rule}]:`);
      console.log(`    Expected: ${f.expected}, Actual: ${f.actual}`);
      if (f.error) console.log(`    Error: ${f.error}`);
    });
    if (failures.length > 10) {
      console.log(`  ... and ${failures.length - 10} more failures`);
    }
  }
  
  // Performance metrics
  if (results.processingTimes.length > 0) {
    const avgTime = results.processingTimes.reduce((a, b) => a + b, 0) / results.processingTimes.length;
    console.log('\nPerformance Metrics:');
    console.log(`  Average validation time: ${avgTime.toFixed(2)}ms`);
    console.log(`  Total execution time: ${results.processingTimes.reduce((a, b) => a + b, 0).toFixed(0)}ms`);
  }
  
  // Success criteria: at least 95% of test cases should behave as expected
  const successRate = results.passed / results.total;
  expect(successRate).toBeGreaterThan(0.95);
});

tap.start();