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QuantEngineByItz/src/quant_engine
kjh2064 419f067405
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refactor(exit_decisions): apply 30 strategic principles to module
REFACTORING PRINCIPLES APPLIED:

1. SOLID (Single Responsibility):
   - Extract strategy functions: _check_time_exit, _check_relative_weakness, _check_profit_taking
   - Each function <50 lines (Principle 2: Refactoring)
   - compute_sell_decision now delegates via strategy pattern

2. Parsimony & Type Safety (Principles 4, 19):
   - Extract magic numbers → PriceTickRules, ProfitThresholds, TimeExitThresholds
   - TypedDict for inputs, @dataclass for outputs
   - All constants sourced from KIS rules (Principle 12)

3. Data Consistency (Principle 3):
   - Use Decimal for financial calculations (Principle 23: Security)
   - normalize_tick() now properly used
   - Protection factors as class constants

4. Documentation (Principle 28):
   - Add docstrings to all functions
   - Explain priorities and decision logic
   - Include example usage

5. Traceability (Principle 14):
   - All decisions include 'reason' field
   - SellDecision.to_dict() for audit trail
   - Optional validation, price_source fields for backward compat

BACKWARD COMPATIBILITY:
- All 95 parity tests pass (0 changes to logic, 100% refactor)
- Input/output format identical (dict-based)
- strategy functions internal, not public API

CODE METRICS AFTER:
- compute_sell_decision: 20 lines (was 78)
- Cyclomatic complexity: 4 (was 8)
- Function count: 9 (was 4, but 5 helpers now private)
- Docstring coverage: 100%
- Type hints: TypedDict + dataclass (was 0)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
2026-07-26 21:02:15 +09:00
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