Application Design

Author: sdangol

aidlc-docs/aidlc-state.md

@@ -12,7 +12,7 @@
 - [x] Requirements Analysis (ALWAYS - Adaptive depth) - **COMPLETED**
 - [x] User Stories (CONDITIONAL) - **COMPLETED**
 - [x] Workflow Planning (ALWAYS) - **COMPLETED**
-- [ ] Application Design (CONDITIONAL) - **EXECUTE**
+- [x] Application Design (CONDITIONAL) - **COMPLETED**
 - [ ] Units Generation (CONDITIONAL) - **SKIP**
 - [ ] User Stories (CONDITIONAL) - **PENDING**
 - [ ] Workflow Planning (ALWAYS) - **PENDING**

aidlc-docs/audit.md

@@ -420,3 +420,157 @@
 **Next Phase**: Application Design
 
 ---
+
+## Workflow Planning - Approval
+**Timestamp**: 2025-11-07T14:48:35.394Z
+**User Input**: "y"
+**AI Response**: Execution plan approved, proceeding to Application Design
+**Context**: INCEPTION phase - Workflow Planning approved, moving to Application Design
+
+**Status**: Execution plan APPROVED
+
+**Next Phase**: Application Design
+
+---
+
+## Application Design - Plan Created
+**Timestamp**: 2025-11-07T14:48:35.394Z
+**AI Response**: Created application design plan with 8 clarifying questions
+**Context**: INCEPTION phase - Application Design stage
+
+**Design Plan Components**:
+- 6-phase execution checklist (Component Identification → Documentation)
+- 8 clarifying questions covering:
+  - Validation middleware structure
+  - Schema adapter design
+  - Configuration parser approach
+  - Type inference utilities organization
+  - Error construction strategy
+  - OpenAPI integration structure
+  - Backward compatibility handling
+  - Component granularity preference
+
+**Artifacts to Generate**:
+- components.md (component definitions and responsibilities)
+- component-methods.md (method signatures and purposes)
+- services.md (service definitions and orchestration)
+- component-dependency.md (dependency relationships and data flow)
+
+**Next Action**: Awaiting user answers to design plan questions
+
+---
+
+## Application Design - Plan Answers Received
+**Timestamp**: 2025-11-07T15:00:10.421Z
+**User Input**: "y"
+**AI Response**: Analyzed answers, identified need for follow-up clarifications
+**Context**: INCEPTION phase - Application Design stage
+
+**Answers Summary**:
+- Q1: Single ValidationMiddleware component (A)
+- Q2: Use standard-schema package directly (D)
+- Q3: Parse inline within ValidationMiddleware (B)
+- Q4: Ideally TypeScript built-in, integrated if necessary (needs clarification)
+- Q5: Construct errors inline (B)
+- Q6: OpenAPI as part of schema adapter (B)
+- Q7: Go with new interface (needs clarification on backward compatibility)
+- Q8: Follow existing Event Handler granularity (needs clarification on file structure)
+
+**Issues Identified**:
+1. Q4: Ambiguous "ideally D, B if necessary" - need criteria for when B is necessary
+2. Q7: "Go with new interface" unclear on backward compatibility approach
+3. Q8: Need specific file structure pattern based on existing code
+
+**Action Taken**: Created follow-up clarification questions
+
+**Next Action**: Awaiting user responses to follow-up questions
+
+---
+
+## Application Design - Follow-up Answers Received
+**Timestamp**: 2025-11-07T15:04:57.751Z
+**User Input**: "y"
+**AI Response**: All answers received, proceeding with application design generation
+**Context**: INCEPTION phase - Application Design stage
+
+**Follow-up Answers**:
+- Type Inference: Start with TypeScript built-in, add utilities only if issues arise (C)
+- Backward Compatibility: No backward compatibility - new interface only (A)
+- File Structure: Middleware in middleware/, errors in errors.ts, types in types.ts (X)
+
+**Final Design Configuration**:
+- Single ValidationMiddleware component
+- Use standard-schema package directly
+- Parse configuration inline
+- TypeScript built-in type inference (add utilities if needed)
+- Construct errors inline
+- OpenAPI integration in schema adapter
+- No backward compatibility (new req/res interface only)
+- Follow existing Event Handler file structure pattern
+
+**Next Action**: Generating application design artifacts
+
+---
+
+## Application Design - Complete
+**Timestamp**: 2025-11-07T15:04:57.751Z
+**AI Response**: Generated application design artifacts
+**Context**: INCEPTION phase - Application Design completed
+
+**Artifacts Generated**:
+- components.md: 3 components (ValidationMiddleware, Validation Errors, Validation Types)
+- component-methods.md: 6 methods with signatures and high-level purposes
+- services.md: No service layer (middleware pattern used)
+- component-dependency.md: Dependency matrix and data flow diagrams
+
+**Key Design Decisions**:
+- Single ValidationMiddleware component in middleware/ folder
+- Errors in existing errors.ts file
+- Types in existing types.ts file
+- No custom adapter layer (use standard-schema directly)
+- No service layer (middleware pattern)
+- TypeScript built-in type inference
+- No backward compatibility (new req/res interface only)
+
+**Component Structure**:
+- ValidationMiddleware: Main validation logic
+- RequestValidationError: HTTP 422 errors
+- ResponseValidationError: HTTP 500 errors
+- Validation types: Configuration and validated data types
+
+**Next Phase**: CONSTRUCTION - Functional Design
+
+---
+
+## Application Design - Updates Based on Feedback
+**Timestamp**: 2025-11-07T15:18:06.138Z
+**User Input**: "The validate middleware should be a middleware factory that returns a middleware. Before returning, it should do the configuration validation only once when the middleware is registered and parse request and response when there is a request. Additionally, try to consolidate components of the validation without creating useless tiny abstractions."
+**AI Response**: Updated application design to use middleware factory pattern and consolidate logic
+**Context**: INCEPTION phase - Application Design updated
+
+**Changes Made**:
+
+1. **Middleware Factory Pattern**:
+   - Changed from `validate()` method to `validation()` factory function
+   - Factory validates config and parses schemas once at registration time
+   - Returns middleware function that executes per request
+   - Performance optimization: config parsing happens once, not per request
+
+2. **Consolidated Logic**:
+   - Removed `validateWithSchema()` as separate abstraction
+   - Removed `parseValidationConfig()` as separate method
+   - Integrated logic directly into factory and validation methods
+   - Simplified to 3 core methods:
+     - `validation()`: Factory that parses config once
+     - `validateRequest()`: Request validation
+     - `validateResponse()`: Response validation
+
+3. **Updated Documentation**:
+   - component-methods.md: Updated method signatures and flow
+   - components.md: Updated responsibilities and relationships
+   - Added performance principle (parse once at registration)
+   - Added "No Tiny Abstractions" principle
+
+**Status**: Application Design updated, awaiting approval
+
+---