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docs/RAG_ENGINE_MVP_TASKS.md

@@ -1,43 +1,59 @@
 # RAG Engine MVP Tasks - AI Study Assistant
 
-## 🧠 MVP RAG ENGINE ROADMAP (8-12 WEEKS)
+> ⚠️ **IMPORTANTE - DOCUMENTO DESATUALIZADO**: Este documento descreve uma arquitetura Python/FAISS que **NÃO FOI IMPLEMENTADA**.
+>
+> **Implementação Real:**
+> - **Linguagem**: Dart (Flutter)
+> - **Localização**: `lib/core/services/materials_rag_service.dart`, `lib/core/services/rag_ai_service.dart`
+> - **Vector Store**: Firestore com embeddings mock (hash-based)
+> - **PDF Processing**: `syncfusion_flutter_pdf` (não Python)
+> - **Busca**: Keyword window search (não FAISS)
+>
+> **NÃO EXISTE:** Python, FAISS, Sentence Transformers, OpenAI, Anthropic
 
 ---
 
-## 📚 WEEK 1-2: FOUNDATION & SETUP
+## 🧠 MVP RAG ENGINE ROADMAP (DOCUMENTAÇÃO ORIGINAL - NÃO IMPLEMENTADA)
+
+---
+
+## 📚 WEEK 1-2: FOUNDATION & SETUP (NOT IMPLEMENTED)
 
 ### Task 1.1: Vector Database Setup
-**Priority**: Critical  
-**Estimated Time**: 8 hours  
-**Dependencies**: None
+**Status**: ❌ NOT IMPLEMENTED - FAISS não é utilizado
 
-#### Subtasks:
-- [ ] Choose vector database technology (FAISS for MVP)
-- [ ] Set up development environment
-- [ ] Install required dependencies
-- [ ] Configure storage for vector indices
-- [ ] Create basic vector operations
-- [ ] Set up backup and recovery
+#### What Actually Exists:
+```dart
+// lib/core/services/vector_service.dart
+class VectorService {
+  // Mock embedding generation using text hashing
+  static List<double> generateEmbedding(String text) {
+    final embedding = List<double>.filled(384, 0.0);
+    // Hash-based deterministic embeddings (not ML)
+    return embedding;
+  }
+}
 
-#### Technology Stack:
+// lib/core/services/materials_rag_service.dart
+class MaterialsRAGService {
+  // Keyword-based window search for PDFs
+  static Future<String> getContextForQuestion(...) async {
+    // 1. Extract PDF text with syncfusion_flutter_pdf
+    // 2. Find keyword matches
+    // 3. Return window of 1200 chars around match
+    // NO FAISS, NO VECTOR SEARCH, NO PYTHON
+  }
+}
+```
+
+#### Technology Stack (Original - NOT USED):
 ```bash
-# Core dependencies
-pip install faiss-cpu  # or faiss-gpu for GPU acceleration
-pip install sentence-transformers
-pip install numpy
-pip install pandas
-pip install scikit-learn
-
-# Text processing
-pip install nltk
-pip install spacy
-python -m spacy download en_core_web_sm
-
-# Storage and utilities
-pip install firebase-admin
-pip install google-cloud-storage
-pip install pickle
-pip install h5py
+# These dependencies DO NOT EXIST in the project:
+# ❌ pip install faiss-cpu
+# ❌ pip install sentence-transformers
+# ❌ pip install numpy
+# ❌ pip install nltk
+# ❌ pip install spacy
 ```
 
 #### Project Structure: