analyze-convertTimezone-complexity.js•3.33 kB
#!/usr/bin/env node
/**
* Research script to analyze convertTimezone.ts complexity
* Current: 126 lines, complexity 29
*/
console.log('=== convertTimezone.ts Complexity Analysis ===\n');
console.log('Current Structure Analysis:');
console.log('1. Early parameter validation (lines 19-27)');
console.log(' - String length validations');
console.log(' - Format parameter default');
console.log(' - Cache key generation\n');
console.log('2. Cache check (lines 33-37)\n');
console.log('3. Timezone validation (lines 39-58) - 2 complexity');
console.log(' - from_timezone validation');
console.log(' - to_timezone validation\n');
console.log('4. Date parsing logic (lines 60-99) - MAJOR COMPLEXITY ~10');
console.log(' - Unix timestamp handling');
console.log(' - ISO string with Z suffix');
console.log(' - String with explicit offset (+05:00)');
console.log(' - Local time string');
console.log(' - Error handling\n');
console.log('5. Timezone conversion logic (lines 101-155) - MAJOR COMPLEXITY ~15');
console.log(' - Offset calculations');
console.log(' - Original time formatting (complex!)');
console.log(' - Converted time formatting');
console.log(' - Offset string extraction\n');
console.log('6. Result building & caching (lines 156-167) - SIMPLE\n');
console.log('7. Error handling (lines 168-183) - 2 complexity\n');
console.log('=== Complexity Sources ===');
console.log('1. Date parsing: ~10 complexity (nested if/else)');
console.log('2. Result formatting: ~15 complexity (nested conditions)');
console.log('3. Timezone validations: ~2 complexity');
console.log('4. Error handling: ~2 complexity\n');
console.log('=== Proposed Refactoring Phases ===\n');
console.log('Phase 1: Extract timezone validation helper');
console.log('- validateTimezones(from_timezone, to_timezone)');
console.log('- Expected reduction: ~2 complexity, ~20 lines\n');
console.log('Phase 2: Extract date parsing helper');
console.log('- parseDateForConversion(time, from_timezone)');
console.log('- Returns: { date: Date, actualFromTimezone: string }');
console.log('- Expected reduction: ~10 complexity, ~40 lines\n');
console.log('Phase 3: Extract offset formatting helpers');
console.log('- formatOriginalTime(utcDate, time, actualFromTimezone)');
console.log('- extractOffsetString(time, utcDate, timezone)');
console.log('- Expected reduction: ~15 complexity, ~45 lines\n');
console.log('Expected Final State:');
console.log('- Main function: ~50 lines (from 126)');
console.log('- Complexity: ~10 (from 29)');
console.log('- Much clearer separation of concerns\n');
console.log('=== Key Testing Areas ===');
console.log('1. Unix timestamps (always UTC)');
console.log('2. ISO strings with Z suffix');
console.log('3. Strings with explicit offset (+05:00)');
console.log('4. Local time strings');
console.log('5. Custom format parameter');
console.log('6. Offset preservation for explicit offsets');
console.log('7. Error handling for invalid inputs\n');
console.log('=== Specific Complexity Points ===');
console.log('1. Preserving original offset format is complex (lines 111-127)');
console.log('2. Different formatting based on input type');
console.log('3. Special handling for Z suffix vs explicit offset');
console.log('4. Unix timestamps treated as UTC regardless of from_timezone');