import sys
import os
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import unittest
from unittest.mock import MagicMock, patch, mock_open
import pinecone
from langchain.schema import Document
from core.rag_engine import RAGPrep
from typing import List, Dict, Optional
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain_community.document_loaders import PyPDFLoader, DirectoryLoader
from langchain_openai import OpenAIEmbeddings
import pinecone
from tqdm.auto import tqdm
from langchain.schema import Document
from config import get_settings


class TestRAGPrep(unittest.TestCase):
    def setUp(self):
        """Set up test fixtures"""
        self.settings = get_settings()
        self.mock_settings = MagicMock()
        self.mock_settings.INDEX_NAME = "test-index"
        self.mock_settings.PINECONE_API_KEY = self.settings.PINECONE_API_KEY
        self.mock_settings.CLOUD = "aws"
        self.mock_settings.REGION = "us-east-1"
        self.mock_settings.PDF_DIRECTORY = self.settings.PDF_DIRECTORY
        self.mock_settings.CHUNK_SIZE = 1000
        self.mock_settings.CHUNK_OVERLAP = 200
        self.mock_settings.DIMENSIONS = 1536
        self.mock_settings.OPENAI_API_KEY = self.settings.OPENAI_API_KEY

        # Create patcher for get_settings and other dependencies
        self.settings_patcher = patch('core.rag_engine.get_settings', return_value=self.mock_settings)
        self.embeddings_patcher = patch('core.rag_engine.OpenAIEmbeddings')
        self.pinecone_patcher = patch('core.rag_engine.pinecone.Pinecone')
        
        # Start all patchers
        self.mock_get_settings = self.settings_patcher.start()
        self.mock_embeddings = self.embeddings_patcher.start()
        self.mock_pinecone = self.pinecone_patcher.start()
        
    def tearDown(self):
        """Clean up after tests"""
        self.settings_patcher.stop()
        self.embeddings_patcher.stop()
        self.pinecone_patcher.stop()

    def test_init(self):
        """Test RAGPrep initialization"""
        # Create instance
        rag_prep = RAGPrep()
        
        # Assert initialization
        self.assertEqual(rag_prep.index_name, "test-index")
        self.assertEqual(rag_prep.settings, self.mock_settings)
        self.mock_pinecone.assert_called_once_with(self.mock_settings.PINECONE_API_KEY)
        self.mock_embeddings.assert_called_once_with(openai_api_key=self.mock_settings.OPENAI_API_KEY)

    @patch('core.rag_engine.DirectoryLoader')
    def test_load_and_split_pdfs(self, mock_loader_class):
        """Test PDF loading and splitting"""
        # Setup mock documents
        mock_docs = [
            Document(page_content="Test content 1", metadata={"source": "test1.pdf", "page": 1}),
            Document(page_content="Test content 2", metadata={"source": "test2.pdf", "page": 1})
        ]
        
        # Configure the mock loader
        mock_loader_instance = MagicMock()
        mock_loader_instance.load.return_value = mock_docs
        mock_loader_class.return_value = mock_loader_instance
        
        # Create instance and test
        rag_prep = RAGPrep()
        chunks = rag_prep.load_and_split_pdfs()
        
        # Assertions
        self.assertIsInstance(chunks, list)
        mock_loader_class.assert_called_once_with(
            self.mock_settings.PDF_DIRECTORY,
            glob="**/*.pdf",
            loader_cls=PyPDFLoader
        )
        mock_loader_instance.load.assert_called_once()

    def test_process_and_upload(self):
        """Test processing and uploading documents"""
        # Setup mock documents
        mock_docs = [
            Document(page_content="Test 1", metadata={"source": "test.pdf", "page": 1}),
            Document(page_content="Test 2", metadata={"source": "test.pdf", "page": 2})
        ]
        
        # Create mock embeddings instance
        mock_embeddings_instance = MagicMock()
        mock_embeddings_instance.embed_documents.return_value = [[0.1] * 1536, [0.2] * 1536]
        self.mock_embeddings.return_value = mock_embeddings_instance
        
        # Mock the index
        mock_index = MagicMock()
        self.mock_pinecone.return_value.Index.return_value = mock_index
        
        # Mock load_and_split_pdfs
        with patch.object(RAGPrep, 'load_and_split_pdfs', return_value=mock_docs):
            # Create instance and test
            rag_prep = RAGPrep()
            rag_prep.process_and_upload()
            
            # Assertions
            mock_embeddings_instance.embed_documents.assert_called_once()
            self.assertTrue(mock_index.upsert.called)
            # Verify the format of the upsert call
            called_args = mock_index.upsert.call_args[1]['vectors']
            self.assertEqual(len(called_args), 2)  # Two documents
            self.assertTrue(all(len(v[1]) == 1536 for v in called_args))  
    def test_cleanup_index_success(self):
        """Test successful index cleanup"""
        with patch('pinecone.Pinecone') as mock_pinecone:
            # Setup mock
            mock_pc = mock_pinecone.return_value
            mock_pc.list_indexes.return_value.names.return_value = ["test-index"]
            mock_index = MagicMock()
            mock_pc.Index.return_value = mock_index
            
            # Create instance and test
            rag_prep = RAGPrep()
            result = rag_prep.cleanup_index()
            
            # Assertions
            self.assertTrue(result)
            mock_index.delete.assert_called_once_with(delete_all=True)

    def test_cleanup_index_no_index(self):
        """Test cleanup when index doesn't exist"""
        with patch('pinecone.Pinecone') as mock_pinecone:
            # Setup mock
            mock_pc = mock_pinecone.return_value
            mock_pc.list_indexes.return_value.names.return_value = []
            
            # Create instance and test
            rag_prep = RAGPrep()
            result = rag_prep.cleanup_index()
            
            # Assertions
            self.assertTrue(result)
            mock_pc.Index.assert_not_called()

    def test_cleanup_index_error(self):
        """Test cleanup with error"""
        with patch('pinecone.Pinecone') as mock_pinecone:
            # Setup mock to raise exception
            mock_pc = mock_pinecone.return_value
            mock_pc.list_indexes.return_value.names.return_value = ["test-index"]
            mock_pc.Index.side_effect = Exception("Test error")
            
            # Create instance and test
            rag_prep = RAGPrep()
            result = rag_prep.cleanup_index()
            
            # Assertions
            self.assertFalse(result)

if __name__ == '__main__':
    unittest.main()