# Complexity Audit Report

**Branch**: fix/tech-debt-quick-wins
**Base**: main
**Date**: 2025-12-13 20:01:00
**Commits Analyzed**:
- 70b4747 fix: resolve integration test crashes and test architecture issues
- 9105b27 refactor: add type safety and defense-in-depth for data layer

---

## Executive Summary

This branch introduces **technical improvements** focused on:
1. Type safety via Zod schema validation at data layer boundaries
2. Database CHECK constraints for defense-in-depth
3. Test infrastructure fixes (NoOpProcessSpawner, isolated temp directories)
4. Proper resource cleanup in tests

**Overall Assessment**: The changes are well-structured with good complexity characteristics. No blocking issues found.

---

## Files Changed

| File | Lines Added | Lines Removed | Purpose |
|------|-------------|---------------|---------|
| `src/bootstrap.ts` | +85 | -6 | NoOpProcessSpawner for tests |
| `src/implementations/database.ts` | +78 | -6 | AUTOBEAT_DATABASE_PATH, migration v3 |
| `src/implementations/task-repository.ts` | +49 | -24 | Zod schema validation |
| `src/implementations/dependency-repository.ts` | +31 | -6 | Zod schema validation |
| `src/core/container.ts` | +10 | 0 | ResourceMonitor shutdown |
| `tests/integration/task-dependencies.test.ts` | +74 | -45 | Test isolation, proper cleanup |
| `tests/fixtures/test-data.ts` | +1 | -1 | Fix invalid status value |
| `package.json` | +1 | -1 | AUTOBEAT_TEST_MODE env var |

---

## Category 1: Issues in Your Changes (BLOCKING)

**None identified.**

All new code maintains reasonable complexity levels.

---

## Category 2: Issues in Code You Touched (Should Fix)

### MEDIUM: MockChildProcess could be extracted to test utilities

**File**: `/workspace/delegate/src/bootstrap.ts`
**Lines**: 21-59 (new)
**Type**: Code organization

```typescript
class MockChildProcess extends EventEmitter {
  readonly pid: number;
  readonly killed: boolean = false;
  readonly exitCode: number | null = null;
  // ... 35+ lines of stub implementation
}
```

**Issue**: Production bootstrap file now contains test-only code (MockChildProcess, NoOpProcessSpawner).

**Recommendation**: Extract to `src/testing/mocks/process-spawner.ts` and conditionally import. This:
- Keeps production code clean
- Makes test utilities reusable
- Reduces bootstrap.ts cognitive load

**Severity**: Medium - Does not affect runtime behavior, but violates separation of concerns.

---

### LOW: getMigrations() method is growing large

**File**: `/workspace/delegate/src/implementations/database.ts`
**Lines**: 232-418 (method spans 186 lines)
**Type**: Long method

The `getMigrations()` method now spans ~186 lines with 3 migrations. As migrations accumulate, this will become harder to maintain.

**Current Cyclomatic Complexity**: 1 (linear array of objects)
**Cognitive Complexity**: Low (declarative structure)

**Recommendation**: No immediate action needed. However, consider:
1. Moving migrations to separate files when count exceeds 5-6
2. Pattern: `src/implementations/migrations/001-baseline.ts`, etc.

**Severity**: Low - Not blocking. Monitor growth over time.

---

### LOW: Repeated validation pattern in rowToTask/rowToDependency

**File**: `/workspace/delegate/src/implementations/task-repository.ts:270-308`
**File**: `/workspace/delegate/src/implementations/dependency-repository.ts:549-569`

Both files now have identical validation patterns:

```typescript
private rowToTask(row: TaskRow): Task {
  const validated = TaskRowSchema.safeParse(row);
  if (!validated.success) {
    throw new Error(`Invalid task row data for id=${row.id}: ${validated.error.message}`);
  }
  const data = validated.data;
  // ... mapping
}
```

**Issue**: Code duplication across repositories.

**Recommendation**: Consider extracting a generic `validateRow<T>` helper:

```typescript
// src/core/validation.ts
function validateRow<T>(schema: ZodSchema<T>, row: unknown, entityType: string): T {
  const result = schema.safeParse(row);
  if (!result.success) {
    throw new Error(`Invalid ${entityType} row: ${result.error.message}`);
  }
  return result.data;
}
```

**Severity**: Low - Acceptable duplication for now (only 2 occurrences).

---

## Category 3: Pre-existing Issues (Not Blocking)

### INFO: bootstrap() function is complex

**File**: `/workspace/delegate/src/bootstrap.ts`
**Lines**: 177-594 (417 lines)
**Pre-existing**: Yes

The `bootstrap()` function spans 417 lines with:
- Cyclomatic complexity: ~15 (multiple error branches)
- 7+ handler setup blocks with similar patterns
- Deep nesting in handler registration

**This is pre-existing** - the branch only adds ~20 lines to this function.

**Recommendation for future PR**:
1. Extract handler setup to separate function
2. Use builder pattern for handler registration
3. Consider `HandlerRegistry.registerAll(container, eventBus, logger)`

---

### INFO: addDependenciesTransaction complexity

**File**: `/workspace/delegate/src/implementations/dependency-repository.ts`
**Lines**: 203-261 (59 lines, pre-existing)
**Cyclomatic Complexity**: ~8

```typescript
const addDependenciesTransaction = this.db.transaction((taskId, dependsOn) => {
  // Validation 1: task exists
  // Validation 2: check dependency count
  // Validation 3: check all dependency targets exist
  // Validation 4: check for existing dependencies
  // Insert loop
});
```

**Pre-existing issue**: The transaction function has multiple validation stages making it harder to test individual validations.

**Not introduced by this branch** - no changes to this logic.

---

## Complexity Metrics Summary

### New Code Analysis

| Metric | Value | Assessment |
|--------|-------|------------|
| New classes | 2 (MockChildProcess, NoOpProcessSpawner) | Acceptable |
| Largest new function | MockChildProcess constructor (11 lines) | Good |
| Max nesting depth (new code) | 2 | Good |
| New cyclomatic complexity added | +3 (if statements) | Low |
| Zod schemas added | 2 (TaskRowSchema, DependencyRowSchema) | Good practice |

### Test Changes

| Metric | Value | Assessment |
|--------|-------|------------|
| Test file lines changed | +74/-45 | Improved clarity |
| New test isolation | Yes (temp directories) | Good |
| Proper cleanup | Yes (container.dispose()) | Good |
| Architecture notes | Added | Excellent documentation |

---

## Specific Line Analysis

### Lines with Highest Complexity

1. **database.ts:359-407** - Migration v3 (tasks table recreation)
   - Complexity: Low (single SQL exec block)
   - SQL is long but declarative
   - Assessment: ACCEPTABLE

2. **bootstrap.ts:282-318** - processSpawner/resourceMonitor registration
   - Added conditional logic for test mode
   - Complexity increase: +2 branches
   - Assessment: ACCEPTABLE (necessary for test isolation)

3. **task-dependencies.test.ts:131-218** - Dependency Validation tests
   - Rewritten test section with architecture notes
   - Complexity: Low (linear test flow)
   - Assessment: IMPROVED readability

---

## Your Changes

### CRITICAL/HIGH: 0
### MEDIUM: 1
### LOW: 2

## Code You Touched

### HIGH: 0
### MEDIUM: 0
### LOW: 0

## Pre-existing

### MEDIUM: 0
### LOW: 2
### INFO: 2

---

## Complexity Score: 8/10

The branch demonstrates good coding practices:
- Type safety improvements via Zod validation
- Defense-in-depth with DB CHECK constraints
- Proper test isolation with temp directories
- Clean resource cleanup patterns
- Well-documented architecture notes in tests

Minor deductions for:
- Test code in production file (-1)
- Migration method length (-1)

---

## Merge Recommendation

**APPROVED**

**Rationale**:
1. No blocking complexity issues
2. All changes improve code quality
3. Type safety additions are well-implemented
4. Test infrastructure improvements are necessary and correct
5. Pre-existing complexity is not worsened by this branch

**Optional improvements** (not blocking):
- Consider extracting MockChildProcess/NoOpProcessSpawner to test utilities
- Consider generic row validation helper to reduce duplication

---

## Appendix: Changed Functions Complexity

| Function/Method | File | Lines | Cyclomatic | Assessment |
|-----------------|------|-------|------------|------------|
| MockChildProcess.constructor | bootstrap.ts | 11 | 1 | Good |
| NoOpProcessSpawner.spawn | bootstrap.ts | 5 | 1 | Good |
| noOpLogger (object) | database.ts | 6 | 1 | Good |
| getDefaultDbPath | database.ts | 49 | 4 | Acceptable |
| getMigrations | database.ts | 186 | 1 | Watch growth |
| rowToTask | task-repository.ts | 38 | 2 | Good |
| rowToDependency | dependency-repository.ts | 21 | 2 | Good |
| Container.dispose | container.ts | 62 | 6 | Pre-existing |

