"""
Tests for Flywheel Module - RAG Pipeline.

Tests document ingestion and processing.
"""

import pytest
import tempfile
import os
from pathlib import Path
from unittest.mock import Mock, patch

from src.flywheel.rag_pipeline import (
    RAGIngestionPipeline,
    DocumentMetadata,
    DocumentChunk,
    IngestionResult,
    get_rag_pipeline
)


class TestDocumentMetadata:
    """Tests for DocumentMetadata dataclass."""
    
    def test_default_values(self):
        """Test default metadata values."""
        meta = DocumentMetadata(
            filename="test.md",
            filepath="/path/test.md",
            technology="linux",
            tenant_id="tenant-001",
            doc_type="manual"
        )
        
        assert meta.language == "pt"
        assert meta.version == "1.0"
        assert meta.tags == []


class TestRAGPipeline:
    """Tests for RAGIngestionPipeline."""
    
    @pytest.fixture
    def pipeline(self):
        """Create pipeline with mocked Qdrant."""
        with patch('src.flywheel.rag_pipeline.get_qdrant_client') as mock:
            mock.return_value = Mock()
            mock.return_value.upsert_document = Mock(return_value=True)
            return RAGIngestionPipeline()
    
    def test_sanitize_removes_scripts(self, pipeline):
        """Test that script tags are removed."""
        content = "Normal text <script>alert('xss')</script> more text"
        result = pipeline._sanitize_content(content)
        
        assert "<script>" not in result
        assert "alert" not in result
        assert "Normal text" in result
    
    def test_sanitize_removes_base64(self, pipeline):
        """Test that large base64 blocks are removed."""
        content = "Data: " + "A" * 150 + " end"
        result = pipeline._sanitize_content(content)
        
        assert "[BASE64_REMOVED]" in result
    
    def test_detect_technology_linux(self, pipeline):
        """Test Linux technology detection."""
        content = "Configure the Linux server using systemctl to manage services."
        tech = pipeline._detect_technology(content)
        
        assert tech == "linux"
    
    def test_detect_technology_docker(self, pipeline):
        """Test Docker technology detection."""
        content = "Build the container using Dockerfile and run with docker compose."
        tech = pipeline._detect_technology(content)
        
        assert tech == "docker"
    
    def test_detect_technology_network(self, pipeline):
        """Test network technology detection."""
        content = "Configure the firewall rules and routing tables."
        tech = pipeline._detect_technology(content)
        
        assert tech == "network"
    
    def test_extract_tags(self, pipeline):
        """Test tag extraction from content."""
        content = "This document covers Linux server administration with nginx as reverse proxy and postgresql database."
        tags = pipeline._extract_tags(content)
        
        assert "linux" in tags
        assert "nginx" in tags
        assert "postgresql" in tags
    
    def test_chunk_content(self, pipeline):
        """Test document chunking."""
        meta = DocumentMetadata(
            filename="test.md",
            filepath="/test/test.md",
            technology="general",
            tenant_id="tenant-001",
            doc_type="manual"
        )
        
        content = "First paragraph.\n\nSecond paragraph.\n\nThird paragraph."
        chunks = pipeline._chunk_content(content, meta)
        
        assert len(chunks) >= 1
        assert all(c.metadata == meta for c in chunks)
        assert chunks[0].chunk_index == 0
    
    def test_generate_chunk_id(self, pipeline):
        """Test chunk ID generation."""
        id1 = pipeline._generate_chunk_id("/path/file.md", 0)
        id2 = pipeline._generate_chunk_id("/path/file.md", 1)
        id3 = pipeline._generate_chunk_id("/path/file.md", 0)
        
        assert id1 != id2
        assert id1 == id3  # Same inputs should give same ID
    
    def test_generate_embedding(self, pipeline):
        """Test embedding generation."""
        emb = pipeline._generate_embedding("test content")
        
        assert len(emb) == 384
        assert all(-1 <= v <= 1 for v in emb)
    
    def test_ingest_file_not_found(self, pipeline):
        """Test ingestion of non-existent file."""
        result = pipeline.ingest_file(
            filepath="/nonexistent/file.md",
            tenant_id="tenant-001"
        )
        
        assert result.success is False
        assert "not found" in result.error.lower()
    
    def test_ingest_file_success(self, pipeline):
        """Test successful file ingestion."""
        with tempfile.NamedTemporaryFile(mode='w', suffix='.md', delete=False) as f:
            f.write("# Test Document\n\nThis is a test about Linux servers.")
            filepath = f.name
        
        try:
            result = pipeline.ingest_file(
                filepath=filepath,
                tenant_id="tenant-001"
            )
            
            assert result.success is True
            assert result.chunks_created >= 1
        finally:
            os.unlink(filepath)


class TestRAGPipelineSingleton:
    """Tests for singleton."""
    
    def test_singleton(self):
        """Test singleton returns same instance."""
        import src.flywheel.rag_pipeline as module
        module._pipeline = None
        
        with patch('src.flywheel.rag_pipeline.get_qdrant_client'):
            p1 = get_rag_pipeline()
            p2 = get_rag_pipeline()
            
            assert p1 is p2