# 📄 Documentation & Reference Models

This `/docs` folder contains **Product Requirements Documents (PRD)**, **data model definitions**, and **Firebase schema references** for the Karaoke App project.

These files are intended for:
- 📃 Developers reviewing the business logic and architecture.
- 🤖 AI tools like Cursor or Copilot that reference documentation for context-aware coding.
- 📝 Project planning, architecture decisions, and future enhancements.
- 🚀 **Building the app from scratch with any framework/platform combination.**

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## Contents

| File | Purpose |
|------|---------|
| `PRD.md` | **Complete Product Requirements Document** — platform-agnostic business logic, technical specifications, data flows, service APIs, component architecture, error handling, and performance optimizations. **Self-guiding for AI implementation.** |
| `types.ts` | Reference TypeScript interfaces used for modeling app objects. **Not imported into app runtime code.** |
| `firebase_schema.json` | Example Firebase Realtime Database structure for understanding data relationships and CRUD operations. |

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## 🚀 How to Use This Documentation

### **For AI-Assisted Development:**
Simply say **"Read this PRD"** in any new chat. The PRD contains:
- **Self-guiding instructions** for AI implementation
- **Complete technical specifications** for 100% accuracy
- **Implementation questions** to determine platform/framework choices
- **Step-by-step build process** with checklists

### **For Human Developers:**
- **Reference during implementation** for business logic and data flows
- **Guide for architecture decisions** and technology choices
- **Source of truth** for all functional requirements
- **Migration guide** when switching frameworks/platforms

### **For New Implementations:**
1. **Read the PRD completely** - it contains comprehensive specifications
2. **Answer implementation questions** from Section 29
3. **Follow the implementation checklist** for complete build process
4. **Preserve business logic** while adapting UI to chosen framework

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## 📋 Key Features of the Updated PRD

### **Platform-Agnostic Design:**
- **Core requirements** separated from implementation details
- **Framework-specific sections** clearly marked
- **Migration guidance** for different platforms
- **Toolset rationale** for informed technology choices

### **Complete Technical Specifications:**
- **Data flow diagrams** for all operations
- **State management architecture** with exact structure
- **Service layer APIs** with function signatures
- **Component architecture** with interfaces and behavior
- **Error handling matrix** for all scenarios
- **Performance specifications** with optimization patterns

### **Implementation Guide:**
- **7 key questions** to determine platform/framework
- **5-phase implementation checklist**
- **Must preserve vs. can replace** guidelines
- **Critical success factors** for accurate builds

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## 🔄 Workflow for New Versions

### **When Creating New Implementations:**
1. **Use the PRD as-is** - it's designed for any framework/platform
2. **Follow the implementation guide** in Section 29
3. **Preserve all business logic** while adapting UI layer
4. **Test against specifications** for 100% accuracy

### **When Updating the PRD:**
1. **Keep platform-agnostic requirements** intact
2. **Add new implementation details** to appropriate sections
3. **Update toolset sections** with new technology choices
4. **Maintain self-guiding nature** for AI implementation

### **When Migrating Platforms:**
1. **Keep all business logic** from core requirements
2. **Replace only implementation details** in platform-specific sections
3. **Add new platform sections** following the established pattern
4. **Update toolset rationale** for new technology choices

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## Important Notes
- ✅ These files are **not intended for direct import or use in application runtime**.
- ✅ Validation logic and data models here serve as **development references only**.
- ✅ Any updates to business logic, data flow, or app architecture should be reflected here for documentation purposes.
- ✅ AI tools may use this information to assist with code generation but will not access `/src` directly.
- ✅ **The PRD is self-guiding** - it contains all instructions needed for AI implementation.
- ✅ **100% accuracy achievable** when following the complete specifications.

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## 🎯 Success Metrics
- **Zero ambiguity** in technical requirements
- **Framework independence** for easy migration
- **Complete implementation path** from start to finish
- **Consistent results** across different technology stacks
- **Self-documenting** for future developers and AI tools

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_This documentation is designed to be your **ultimate development tool** - enabling accurate builds with any framework/platform combination._