import asyncio
import inspect
import uuid
import os
import tempfile
import shutil
from typing import Any

from langchain.chat_models import init_chat_model
from langchain_sandbox import PyodideSandbox

from langgraph_codeact import EvalCoroutine, create_codeact
from dotenv import find_dotenv, load_dotenv

load_dotenv(find_dotenv())

class FileInjectedPyodideSandbox(PyodideSandbox):
    """Custom PyodideSandbox that can inject files into the virtual filesystem."""
    
    def __init__(self, file_path: str = None, virtual_path: str = "/uploaded_file.log", sessions_dir: str = None, **kwargs):
        # Create a temporary sessions directory if none provided
        if sessions_dir is None:
            sessions_dir = tempfile.mkdtemp(prefix="pyodide_sessions_")
        
        super().__init__(sessions_dir=sessions_dir, **kwargs)
        self.file_path = file_path
        self.virtual_path = virtual_path
        self._file_injected = False
        self._temp_sessions_dir = sessions_dir
        self._created_temp_dir = sessions_dir is None
    
    async def execute(self, code: str, **kwargs):
        # If we have a file to inject, prepend the injection code to the user code
        if self.file_path and os.path.exists(self.file_path):
            print(f"Injecting file {self.file_path} into execution")
            
            try:
                with open(self.file_path, 'r') as f:
                    file_content = f.read()
                
                # Use base64 encoding to avoid string literal issues
                import base64
                encoded_content = base64.b64encode(file_content.encode('utf-8')).decode('ascii')
                
                # Prepend file injection code to user code
                injection_code = f'''
# File injection code - inject {self.virtual_path}
import base64
import os

# Decode the file content from base64
encoded_content = """{encoded_content}"""
file_content = base64.b64decode(encoded_content).decode('utf-8')

# Create the file on disk for compatibility
with open("{self.virtual_path}", 'w') as f:
    f.write(file_content)

# Make the content directly available as variables for analysis
log_lines = file_content.splitlines()
total_lines = len(log_lines)

print(f"[INJECTION] Successfully created {self.virtual_path} with {{len(file_content)}} characters")
print(f"[INJECTION] File content available as 'file_content' variable ({{len(file_content)}} chars)")
print(f"[INJECTION] Lines available as 'log_lines' variable ({{total_lines}} lines)")

# Verify injection worked
if os.path.exists("{self.virtual_path}"):
    print(f"[INJECTION] File {self.virtual_path} exists and ready for use")
else:
    print(f"[INJECTION] ERROR: Failed to create {self.virtual_path}")

# Variables now available for analysis:
# - file_content: raw file content as string
# - log_lines: list of individual lines  
# - total_lines: number of lines in the file
# - File also available at: {self.virtual_path}

# End of injection code
'''
                
                # Combine injection code with user code
                combined_code = injection_code + "\n" + code
                print(f"Combined code length: {len(combined_code)}")
                
                return await super().execute(combined_code, **kwargs)
                
            except Exception as e:
                print(f"Error preparing file injection: {e}")
                return await super().execute(code, **kwargs)
        else:
            return await super().execute(code, **kwargs)
    
    def cleanup(self):
        """Clean up temporary directories if we created them."""
        if self._created_temp_dir and self._temp_sessions_dir and os.path.exists(self._temp_sessions_dir):
            try:
                shutil.rmtree(self._temp_sessions_dir)
                print(f"Cleaned up temporary sessions directory: {self._temp_sessions_dir}")
            except Exception as e:
                print(f"Warning: Could not clean up temporary directory {self._temp_sessions_dir}: {e}")
    
    def __del__(self):
        """Cleanup when object is destroyed."""
        self.cleanup()

def create_pyodide_eval_fn(sandbox: PyodideSandbox) -> EvalCoroutine:
    """Create an eval_fn that uses PyodideSandbox.
    """

    async def async_eval_fn(
        code: str, _locals: dict[str, Any]
    ) -> tuple[str, dict[str, Any]]:
        # Create a wrapper function that will execute the code and return locals
        wrapper_code = f"""
def execute():
    try:
        # Execute the provided code
{chr(10).join("        " + line for line in code.strip().split(chr(10)))}
        return locals()
    except Exception as e:
        return {{"error": str(e)}}

execute()
"""
        
        # Convert functions in _locals to their string representation
        context_setup = ""
        for key, value in _locals.items():
            if callable(value):
                # Get the function's source code
                try:
                    src = inspect.getsource(value)
                    context_setup += f"\n{src}"
                except:
                    # If we can't get source, skip it
                    pass
            else:
                context_setup += f"\n{key} = {repr(value)}"

        try:
            # Combine context setup and the actual code
            full_code = context_setup + "\n\n" + wrapper_code
            
            # Execute the code and get the result
            response = await sandbox.execute(code=full_code)

            # Check if execution was successful
            if response.stderr:
                return f"Error during execution: {response.stderr}", {}

            # Get the output from stdout
            output = (
                response.stdout
                if response.stdout
                else "<Code ran, no output printed to stdout>"
            )
            result = response.result

            # If there was an error in the result, return it
            if isinstance(result, dict) and "error" in result:
                return f"Error during execution: {result['error']}", {}

            # Get the new variables by comparing with original locals
            new_vars = {
                k: v
                for k, v in result.items()
                if k not in _locals and not k.startswith("_")
            }
            return output, new_vars

        except Exception as e:
            return f"Error during PyodideSandbox execution: {repr(e)}", {}

    return async_eval_fn


def read_file(file_path: str) -> str:
    """Read a file and return its content."""
    with open(file_path, "r") as file:
        return file.read()


def create_analysis_agent(file_path: str, model=None, virtual_path: str = "/uploaded_file.log", sessions_dir: str = None):
    """
    Create a CodeAct agent configured for file analysis.
    
    Args:
        file_path: Path to the file to analyze
        model: Language model to use (if None, will initialize default)
        virtual_path: Virtual path where file will be mounted in sandbox
        sessions_dir: Directory for PyodideSandbox sessions (if None, will create temp dir)
    
    Returns:
        Compiled CodeAct agent ready for analysis
    """
    if model is None:
        model = init_chat_model("o3-2025-04-16", model_provider="openai")
    
    # Create our custom sandbox with file injection capability
    sandbox = FileInjectedPyodideSandbox(
        file_path=file_path,
        virtual_path=virtual_path,
        sessions_dir=sessions_dir,
        allow_net=True
    )
    
    eval_fn = create_pyodide_eval_fn(sandbox)
    code_act = create_codeact(model, [], eval_fn)
    return code_act.compile()


def get_default_analysis_query(file_extension: str = None) -> str:
    """
    Get a default analysis query based on file type.
    
    Args:
        file_extension: File extension (e.g., '.log', '.csv', '.txt')
    
    Returns:
        Analysis query string
    """
    if file_extension and file_extension.lower() in ['.log', '.txt']:
        return """
Analyze this uploaded file and provide comprehensive insights. Follow the example code patterns below for reliable analysis.

ANALYSIS REQUIREMENTS:
1. **Content Overview** - What type of data/logs this file contains
2. **Security Analysis** - Identify any security-related events, threats, or suspicious activities
3. **Performance Insights** - Find bottlenecks, slow operations, or performance issues
4. **Error Analysis** - Identify and categorize errors, warnings, and critical issues
5. **Statistical Summary** - Basic statistics (line count, data distribution, time ranges)
6. **Key Patterns** - Important patterns, trends, or anomalies found
7. **Recommendations** - Suggested actions based on the analysis

DATA SOURCES AVAILABLE:
- `file_content`: Raw file content as a string
- `log_lines`: List of individual lines 
- `total_lines`: Number of lines in the file
- File path: `/uploaded_file.log`

EXAMPLE CODE PATTERNS TO FOLLOW:

Start with basic analysis, then add specific patterns based on your file type:

1. Import required libraries: re, Counter, defaultdict, datetime
2. Basic file statistics: total_lines, file_content length, sample lines
3. Pattern analysis using regex for security, performance, errors
4. Data extraction and frequency analysis
5. Clear formatted output with sections
6. Actionable recommendations

Use these code snippets as templates:
- Counter() for frequency analysis
- re.search() and re.findall() for pattern matching  
- enumerate(log_lines, 1) for line-by-line processing
- defaultdict(list) for grouping findings
- Clear print statements with section headers

Generate Python code following these patterns. Always include proper error handling, clear output formatting, and actionable insights.
"""
    else:
        return """
Analyze this uploaded file and provide comprehensive insights. Follow these reliable patterns:

ANALYSIS REQUIREMENTS:
1. **File Type Analysis** - What type of file this is and its structure
2. **Content Summary** - Overview of the file contents  
3. **Key Information** - Important data points or patterns found
4. **Data Quality** - Assessment of data completeness and consistency
5. **Statistical Analysis** - Basic statistics and data distribution
6. **Insights & Findings** - Key takeaways from the analysis
7. **Recommendations** - Suggested next steps or insights

DATA SOURCES AVAILABLE:
- file_content: Raw file content as a string
- log_lines: List of individual lines
- total_lines: Number of lines in the file
- File path: /uploaded_file.log

RELIABLE CODE PATTERNS:
1. Start with basic stats: total_lines, len(file_content), file preview
2. Use Counter() for frequency analysis of patterns
3. Use re.findall() for extracting structured data like emails, IPs, dates
4. Analyze line structure and consistency
5. Calculate data quality metrics
6. Provide clear sections with === headers ===
7. End with actionable recommendations

Focus on reliability over complexity. Use simple, proven Python patterns that work consistently.

Generate Python code following these guidelines for robust file analysis.
"""


async def run_file_analysis(file_path: str, query: str = None, model=None) -> str:
    """
    Run file analysis using CodeAct agent.
    
    Args:
        file_path: Path to the file to analyze
        query: Analysis query (if None, will use default based on file type)
        model: Language model to use
    
    Returns:
        Analysis results as string
    """
    if not os.path.exists(file_path):
        return f"❌ File not found: {file_path}"
    
    try:
        # Create the agent
        agent = create_analysis_agent(file_path, model)
        
        # Use default query if none provided
        if query is None:
            file_ext = os.path.splitext(file_path)[1]
            query = get_default_analysis_query(file_ext)
        
        # Run the analysis
        result_parts = []
        async for typ, chunk in agent.astream(
            {"messages": query},
            stream_mode=["values", "messages"],
        ):
            if typ == "messages":
                result_parts.append(chunk[0].content)
            elif typ == "values":
                if chunk and "messages" in chunk:
                    final_message = chunk["messages"][-1]
                    if hasattr(final_message, 'content'):
                        result_parts.append(f"\n\n**Final Analysis:**\n{final_message.content}")
        
        return "\n".join(result_parts) if result_parts else "Analysis completed but no output generated."
        
    except Exception as e:
        return f"❌ Error analyzing file: {str(e)}"


# Example usage and testing
if __name__ == "__main__":
    # This section is for testing only - remove or comment out in production
    import sys
    
    if len(sys.argv) > 1:
        test_file_path = sys.argv[1]
        print(f"Testing with file: {test_file_path}")
        
        async def test_analysis():
            result = await run_file_analysis(test_file_path)
            print("Analysis Result:")
            print("=" * 50)
            print(result)
        
        asyncio.run(test_analysis())
    else:
        print("Usage: python agent.py <file_path>")
        print("Or import this module and use the functions directly.")