"""
Tests for FinEE RAG Engine
==========================

Comprehensive tests for:
- Merchant Knowledge Base
- Category Taxonomy
- Vector Store
- RAG Engine

Author: Ranjit Behera
"""

import pytest
import json
from pathlib import Path
import tempfile


class TestMerchantKnowledgeBase:
    """Tests for MerchantKnowledgeBase."""
    
    def setup_method(self):
        """Setup test fixtures."""
        from finee.rag import MerchantKnowledgeBase, Merchant
        self.kb = MerchantKnowledgeBase()
        self.Merchant = Merchant
    
    def test_default_merchants_loaded(self):
        """Test that default merchants are loaded."""
        assert len(self.kb.merchants) > 30
        assert "swiggy" in self.kb.merchants
        assert "amazon" in self.kb.merchants
        assert "zerodha" in self.kb.merchants
    
    def test_lookup_by_name(self):
        """Test merchant lookup by name."""
        merchant = self.kb.lookup("Swiggy")
        assert merchant is not None
        assert merchant.name == "Swiggy"
        assert merchant.category == "food"
    
    def test_lookup_by_vpa(self):
        """Test merchant lookup by VPA."""
        merchant = self.kb.lookup("swiggy@ybl")
        assert merchant is not None
        assert merchant.name == "Swiggy"
    
    def test_lookup_by_alias(self):
        """Test merchant lookup by alias."""
        merchant = self.kb.lookup("amzn")
        assert merchant is not None
        assert merchant.name == "Amazon"
    
    def test_lookup_partial_match(self):
        """Test partial name matching."""
        merchant = self.kb.lookup("netflix")
        assert merchant is not None
        assert merchant.name == "Netflix"
    
    def test_lookup_not_found(self):
        """Test lookup returns None for unknown merchant."""
        merchant = self.kb.lookup("unknownmerchant123")
        assert merchant is None
    
    def test_search_by_text(self):
        """Test text-based merchant search."""
        matches = self.kb.search("food delivery swiggy order")
        assert len(matches) > 0
        assert matches[0].name == "Swiggy"
    
    def test_add_merchant(self):
        """Test adding new merchant."""
        new_merchant = self.Merchant(
            name="TestMerchant",
            vpa="test@ybl",
            category="test",
            aliases=["tm"],
        )
        self.kb.add_merchant(new_merchant)
        
        assert "testmerchant" in self.kb.merchants
        assert self.kb.lookup("test@ybl") is not None
        assert self.kb.lookup("tm") is not None
    
    def test_get_category_merchants(self):
        """Test getting merchants by category."""
        food_merchants = self.kb.get_category_merchants("food")
        assert len(food_merchants) > 0
        for m in food_merchants:
            assert m.category == "food"
    
    def test_save_and_load(self):
        """Test saving and loading KB."""
        with tempfile.TemporaryDirectory() as tmpdir:
            path = Path(tmpdir) / "merchants.json"
            
            # Save
            self.kb.save(path)
            assert path.exists()
            
            # Load
            from finee.rag import MerchantKnowledgeBase
            loaded_kb = MerchantKnowledgeBase.load(path)
            
            assert len(loaded_kb.merchants) == len(self.kb.merchants)


class TestCategoryTaxonomy:
    """Tests for CategoryTaxonomy."""
    
    def setup_method(self):
        """Setup test fixtures."""
        from finee.rag import CategoryTaxonomy
        self.taxonomy = CategoryTaxonomy
    
    def test_get_hierarchy_simple(self):
        """Test simple category hierarchy."""
        hierarchy = self.taxonomy.get_hierarchy("food")
        assert hierarchy == ["food"]
    
    def test_get_hierarchy_nested(self):
        """Test nested category hierarchy."""
        hierarchy = self.taxonomy.get_hierarchy("grocery")
        assert "shopping" in hierarchy
        assert "grocery" in hierarchy
    
    def test_get_hierarchy_unknown(self):
        """Test unknown category returns itself."""
        hierarchy = self.taxonomy.get_hierarchy("unknown")
        assert hierarchy == ["unknown"]
    
    def test_infer_category_food(self):
        """Test food category inference."""
        category = self.taxonomy.infer_category("lunch delivery from restaurant")
        assert category == "food"
    
    def test_infer_category_investment(self):
        """Test investment category inference."""
        category = self.taxonomy.infer_category("SIP mutual fund trading invest")
        assert category == "investment"
    
    def test_infer_category_bills(self):
        """Test bills category inference."""
        category = self.taxonomy.infer_category("electricity bill payment recharge")
        assert category == "bills"
    
    def test_infer_category_unknown(self):
        """Test unknown text returns 'other'."""
        category = self.taxonomy.infer_category("random text here")
        assert category == "other"


class TestSimpleVectorStore:
    """Tests for SimpleVectorStore."""
    
    def setup_method(self):
        """Setup test fixtures."""
        from finee.rag import SimpleVectorStore, Transaction
        self.store = SimpleVectorStore()
        self.Transaction = Transaction
    
    def test_add_transaction(self):
        """Test adding transaction."""
        txn = self.Transaction(
            id="test1",
            text="HDFC Bank Rs.500 debited Swiggy",
            amount=500.0,
            type="debit",
            merchant="Swiggy",
            category="food",
        )
        self.store.add(txn)
        
        assert len(self.store.documents) == 1
    
    def test_search_similar(self):
        """Test similarity search."""
        # Add some transactions
        transactions = [
            self.Transaction("1", "HDFC Rs.500 Swiggy food", 500, "debit", "Swiggy", "food"),
            self.Transaction("2", "SBI Rs.1000 Amazon shopping", 1000, "debit", "Amazon", "shopping"),
            self.Transaction("3", "ICICI Rs.250 Zomato dinner", 250, "debit", "Zomato", "food"),
        ]
        
        for txn in transactions:
            self.store.add(txn)
        
        # Search
        results = self.store.search("Swiggy food delivery", limit=2)
        
        assert len(results) > 0
        # Swiggy or Zomato should be top result (both are food)
        assert results[0][0].category == "food"
    
    def test_search_empty_store(self):
        """Test search on empty store."""
        results = self.store.search("any query")
        assert results == []
    
    def test_save_and_load(self):
        """Test saving and loading store."""
        # Add transactions
        txn = self.Transaction("1", "Test transaction", 100, "debit")
        self.store.add(txn)
        
        with tempfile.TemporaryDirectory() as tmpdir:
            path = Path(tmpdir) / "store.json"
            
            # Save
            self.store.save(path)
            assert path.exists()
            
            # Load
            from finee.rag import SimpleVectorStore
            loaded = SimpleVectorStore.load(path)
            
            assert len(loaded.documents) == 1


class TestRAGEngine:
    """Tests for RAGEngine."""
    
    def setup_method(self):
        """Setup test fixtures."""
        from finee.rag import RAGEngine
        self.rag = RAGEngine()
    
    def test_retrieve_with_merchant(self):
        """Test retrieval with known merchant."""
        context = self.rag.retrieve("HDFC Bank Rs.499 debited UPI:swiggy@ybl")
        
        assert context.merchant_info is not None
        assert context.merchant_info["name"] == "Swiggy"
        assert context.merchant_info["category"] == "food"
        assert context.confidence_boost > 0
    
    def test_retrieve_with_category(self):
        """Test category inference."""
        context = self.rag.retrieve("Netflix subscription payment")
        
        assert context.category_hierarchy is not None
        assert "entertainment" in context.category_hierarchy
    
    def test_retrieve_investment(self):
        """Test investment detection."""
        context = self.rag.retrieve("Rs.25000 transferred to Zerodha trading")
        
        assert context.merchant_info is not None
        assert context.merchant_info["category"] == "investment"
    
    def test_augment_prompt(self):
        """Test prompt augmentation."""
        context = self.rag.retrieve("Swiggy food order")
        augmented = self.rag.augment_prompt("Swiggy food order", context)
        
        assert "Swiggy" in augmented
        assert "food" in augmented
    
    def test_add_transaction(self):
        """Test adding transaction to history."""
        self.rag.add_transaction(
            "Test transaction text",
            {"amount": 100, "merchant": "Test", "category": "test"}
        )
        
        assert len(self.rag.vector_store.documents) > 0
    
    def test_save_and_load(self):
        """Test saving and loading RAG state."""
        with tempfile.TemporaryDirectory() as tmpdir:
            path = Path(tmpdir) / "rag_state"
            
            # Save
            self.rag.save(path)
            assert (path / "merchants.json").exists()
            
            # Load
            from finee.rag import RAGEngine
            new_rag = RAGEngine()
            new_rag.load(path)
            
            assert len(new_rag.merchant_kb.merchants) > 0


class TestRAGIntegration:
    """Integration tests for RAG with extraction."""
    
    def setup_method(self):
        """Setup test fixtures."""
        from finee.rag import RAGEngine
        self.rag = RAGEngine()
    
    @pytest.mark.parametrize("message,expected_merchant,expected_category", [
        ("HDFC Rs.499 UPI:swiggy@ybl", "Swiggy", "food"),
        ("SBI Rs.999 Netflix subscription", "Netflix", "entertainment"),
        ("ICICI Rs.25000 Zerodha trading", "Zerodha", "investment"),
        ("Axis Rs.1500 Amazon order", "Amazon", "shopping"),
        ("Kotak Rs.350 Uber ride", "Uber", "transport"),
        ("PNB Rs.100 Airtel recharge", "Airtel", "bills"),
    ])
    def test_merchant_detection(self, message, expected_merchant, expected_category):
        """Test merchant detection for various messages."""
        context = self.rag.retrieve(message)
        
        assert context.merchant_info is not None
        assert context.merchant_info["name"] == expected_merchant
        assert context.merchant_info["category"] == expected_category


# ============================================================================
# RUN TESTS
# ============================================================================

if __name__ == "__main__":
    pytest.main([__file__, "-v"])