"""
Unit tests for tg-load-structured-data CLI command.
Tests all modes: suggest-schema, generate-descriptor, parse-only, full pipeline.
"""

import pytest
import json
import tempfile
import os
import csv
import xml.etree.ElementTree as ET
from unittest.mock import Mock, patch, AsyncMock, MagicMock, call
from io import StringIO
import asyncio

# Import the function we're testing
from trustgraph.cli.load_structured_data import load_structured_data


class TestLoadStructuredDataUnit:
    """Unit tests for load_structured_data functionality"""
    
    def setup_method(self):
        """Set up test fixtures"""
        self.test_csv_data = """name,email,age,country
John Smith,john@email.com,35,US
Jane Doe,jane@email.com,28,CA
Bob Johnson,bob@company.org,42,UK"""
        
        self.test_json_data = [
            {"name": "John Smith", "email": "john@email.com", "age": 35, "country": "US"},
            {"name": "Jane Doe", "email": "jane@email.com", "age": 28, "country": "CA"}
        ]
        
        self.test_xml_data = """<?xml version="1.0"?>
<ROOT>
    <data>
        <record>
            <field name="name">John Smith</field>
            <field name="email">john@email.com</field>
            <field name="age">35</field>
        </record>
        <record>
            <field name="name">Jane Doe</field>
            <field name="email">jane@email.com</field>
            <field name="age">28</field>
        </record>
    </data>
</ROOT>"""
        
        self.test_descriptor = {
            "version": "1.0",
            "format": {"type": "csv", "encoding": "utf-8", "options": {"header": True}},
            "mappings": [
                {"source_field": "name", "target_field": "name", "transforms": [{"type": "trim"}]},
                {"source_field": "email", "target_field": "email", "transforms": [{"type": "lower"}]}
            ],
            "output": {
                "format": "trustgraph-objects",
                "schema_name": "customer",
                "options": {"confidence": 0.9, "batch_size": 100}
            }
        }
    
    # CLI Dry-Run Tests - Test CLI behavior without actual connections
    def test_csv_dry_run_processing(self):
        """Test CSV processing in dry-run mode"""
        input_file = self.create_temp_file(self.test_csv_data, '.csv')
        descriptor_file = self.create_temp_file(json.dumps(self.test_descriptor), '.json')
        
        try:
            # Dry run should complete without errors
            result = load_structured_data(
                api_url="http://localhost:8088",
                input_file=input_file,
                descriptor_file=descriptor_file,
                dry_run=True
            )
            
            # Dry run returns None
            assert result is None
            
        finally:
            self.cleanup_temp_file(input_file)
            self.cleanup_temp_file(descriptor_file)
    
    def test_parse_only_mode(self):
        """Test parse-only mode functionality"""
        input_file = self.create_temp_file(self.test_csv_data, '.csv')
        descriptor_file = self.create_temp_file(json.dumps(self.test_descriptor), '.json')
        output_file = tempfile.NamedTemporaryFile(mode='w', suffix='.json', delete=False)
        output_file.close()
        
        try:
            result = load_structured_data(
                api_url="http://localhost:8088",
                input_file=input_file,
                descriptor_file=descriptor_file,
                parse_only=True,
                output_file=output_file.name
            )
            
            # Check output file was created
            assert os.path.exists(output_file.name)
            
            # Check it contains parsed data
            with open(output_file.name, 'r') as f:
                parsed_data = json.load(f)
                assert isinstance(parsed_data, list)
                assert len(parsed_data) > 0
                
        finally:
            self.cleanup_temp_file(input_file)
            self.cleanup_temp_file(descriptor_file)
            self.cleanup_temp_file(output_file.name)
    
    def test_verbose_parameter(self):
        """Test verbose parameter is accepted"""
        input_file = self.create_temp_file(self.test_csv_data, '.csv')
        descriptor_file = self.create_temp_file(json.dumps(self.test_descriptor), '.json')
        
        try:
            # Should accept verbose parameter without error
            result = load_structured_data(
                api_url="http://localhost:8088",
                input_file=input_file,
                descriptor_file=descriptor_file,
                verbose=True,
                dry_run=True
            )
            
            assert result is None
            
        finally:
            self.cleanup_temp_file(input_file)
            self.cleanup_temp_file(descriptor_file)
    
    def create_temp_file(self, content, suffix='.txt'):
        """Create a temporary file with given content"""
        temp_file = tempfile.NamedTemporaryFile(mode='w', suffix=suffix, delete=False)
        temp_file.write(content)
        temp_file.flush()
        temp_file.close()
        return temp_file.name
    
    def cleanup_temp_file(self, file_path):
        """Clean up temporary file"""
        try:
            os.unlink(file_path)
        except:
            pass
    
    # Schema Suggestion Tests
    def test_suggest_schema_file_processing(self):
        """Test schema suggestion reads input file"""
        with tempfile.NamedTemporaryFile(mode='w', suffix='.csv', delete=False) as f:
            f.write(self.test_csv_data)
            f.flush()
            
            try:
                # Should read file without errors (API calls will fail but that's expected)
                with pytest.raises(Exception):  # Expected to fail at API stage
                    load_structured_data(
                        api_url="http://localhost:8088",
                        input_file=f.name,
                        suggest_schema=True,
                        sample_size=100,
                        sample_chars=500
                    )
                
            finally:
                os.unlink(f.name)
    
    # Descriptor Generation Tests  
    def test_generate_descriptor_file_processing(self):
        """Test descriptor generation reads input file"""
        with tempfile.NamedTemporaryFile(mode='w', suffix='.csv', delete=False) as f:
            f.write(self.test_csv_data)
            f.flush()
            
            try:
                # Should read file without errors (API calls will fail but that's expected)
                with pytest.raises(Exception):  # Expected to fail at API stage
                    load_structured_data(
                        api_url="http://localhost:8088",
                        input_file=f.name,
                        generate_descriptor=True,
                        sample_chars=500
                    )
                
            finally:
                os.unlink(f.name)
    
    # Error Handling Tests
    def test_file_not_found_error(self):
        """Test handling of file not found error"""
        with pytest.raises(FileNotFoundError):
            load_structured_data(
                api_url="http://localhost:8088",
                input_file="/nonexistent/file.csv"
            )
    
    def test_invalid_descriptor_format(self):
        """Test handling of invalid descriptor format"""
        with tempfile.NamedTemporaryFile(mode='w', suffix='.csv', delete=False) as input_file:
            input_file.write(self.test_csv_data)
            input_file.flush()
            
            with tempfile.NamedTemporaryFile(mode='w', suffix='.json', delete=False) as desc_file:
                desc_file.write('{"invalid": "descriptor"}')  # Missing required fields
                desc_file.flush()
                
                try:
                    # Should load descriptor file but may fail at processing stage
                    with pytest.raises(Exception):  # Expected to fail at validation or processing
                        load_structured_data(
                            api_url="http://localhost:8088",
                            input_file=input_file.name,
                            descriptor_file=desc_file.name,
                            dry_run=True
                        )
                finally:
                    os.unlink(input_file.name)
                    os.unlink(desc_file.name)
    
    def test_parsing_errors_handling(self):
        """Test handling of parsing errors"""
        invalid_csv = "name,email\n\"unclosed quote,test@email.com"
        input_file = self.create_temp_file(invalid_csv, '.csv')
        descriptor_file = self.create_temp_file(json.dumps(self.test_descriptor), '.json')
        
        try:
            # Should handle parsing errors gracefully
            with pytest.raises(Exception):
                load_structured_data(
                    api_url="http://localhost:8088",
                    input_file=input_file,
                    descriptor_file=descriptor_file,
                    dry_run=True
                )
        finally:
            self.cleanup_temp_file(input_file)
            self.cleanup_temp_file(descriptor_file)
    
    # Validation Tests
    def test_validation_rules_required_fields(self):
        """Test CLI processes data with validation requirements"""
        test_data = "name,email\nJohn,\nJane,jane@email.com"
        descriptor_with_validation = {
            "version": "1.0",
            "format": {"type": "csv", "encoding": "utf-8", "options": {"header": True}},
            "mappings": [
                {
                    "source_field": "name", 
                    "target_field": "name", 
                    "transforms": [],
                    "validation": [{"type": "required"}]
                },
                {
                    "source_field": "email", 
                    "target_field": "email", 
                    "transforms": [],
                    "validation": [{"type": "required"}]
                }
            ],
            "output": {
                "format": "trustgraph-objects",
                "schema_name": "customer",
                "options": {"confidence": 0.9, "batch_size": 100}
            }
        }
        
        input_file = self.create_temp_file(test_data, '.csv')
        descriptor_file = self.create_temp_file(json.dumps(descriptor_with_validation), '.json')
        
        try:
            # Should process despite validation issues (warnings logged)
            result = load_structured_data(
                api_url="http://localhost:8088",
                input_file=input_file,
                descriptor_file=descriptor_file,
                dry_run=True
            )
            
            assert result is None  # Dry run returns None
            
        finally:
            self.cleanup_temp_file(input_file)
            self.cleanup_temp_file(descriptor_file)