src/core/builder/code_generator.py

import textwrap

class CodeGenerator:
    @staticmethod
    def generate_gradio_app(function_code: str, inputs: dict, output_desc: str) -> str:
        """
        Generates the complete code for a Gradio application from a function snippet.
        
        Args:
            function_code: The source code of the main function (e.g. def count_r(word): ...)
            inputs: Dict describing inputs (e.g. {"word": "text"})
            output_desc: Description of the output
            
        Returns:
            The complete source code for app.py
        """
        
        # Simple analysis to find the function name (very naive for now)
        # We assume the code contains "def function_name("
        import re
        match = re.search(r"def\s+([a-zA-Z_][a-zA-Z0-9_]*)\s*\(", function_code)
        func_name = match.group(1) if match else "main_function"

        # Mapping MCP/JSON types to Gradio types
        # For simplicity, we map everything to Text for now or use direct strings
        # TODO: Improve type mapping
        
        # Code construction
        template = f"""
import gradio as gr
import json

# --- User Defined Logic ---
{function_code}

# --- Gradio Interface ---

# Wrapper to handle types if necessary
def wrapper(*args):
    result = {func_name}(*args)
    return str(result) # Force string output for simplicity

# Gradio inputs configuration
# Note: This part is generic for the MVP.
# Ideally, iterate over 'inputs' to create corresponding Gradio components.

iface = gr.Interface(
    fn=wrapper,
    inputs=[gr.Textbox(label=k) for k in {list(inputs.keys())}],
    outputs=gr.Textbox(label="{output_desc}"),
    title="Meta-MCP Generated Tool",
    description="Auto-generated by Meta-MCP Fractal"
)

if __name__ == "__main__":
    iface.launch(mcp_server=True, show_error=True)
"""
        return textwrap.dedent(template).strip()

    @staticmethod
    def generate_tool_module(function_code: str, inputs: dict, output_desc: str, tool_name: str, output_component: str = "text") -> str:
        """
        Generates a Python module containing the tool logic and an interface factory.
        """
        import re
        match = re.search(r"def\s+([a-zA-Z_][a-zA-Z0-9_]*)\s*\(", function_code)
        func_name = match.group(1) if match else "main_function"
        
        inputs_keys_str = str(list(inputs.keys()))

        # Output component mapping
        if output_component == "image":
            gradio_output = 'gr.Image(type="filepath", label="__OUTPUT_DESC__")'
        elif output_component == "audio":
            gradio_output = 'gr.Audio(type="filepath", label="__OUTPUT_DESC__")'
        elif output_component == "video":
            gradio_output = 'gr.Video(label="__OUTPUT_DESC__")'
        elif output_component == "html":
            gradio_output = 'gr.HTML(label="__OUTPUT_DESC__")'
        elif output_component == "json":
            gradio_output = 'gr.JSON(label="__OUTPUT_DESC__")'
        elif output_component == "file":
            gradio_output = 'gr.File(label="__OUTPUT_DESC__")'
        else: # text
            gradio_output = 'gr.Textbox(label="__OUTPUT_DESC__")'

        template = """
import gradio as gr
import json
from PIL import Image
import numpy as np

# --- User Defined Logic ---
__FUNCTION_CODE__

# --- Interface Factory ---
def create_interface():
    return gr.Interface(
        fn=__FUNC_NAME__,
        inputs=[gr.Textbox(label=k) for k in __INPUTS_KEYS__],
        outputs=__GRADIO_OUTPUT__,
        title="__TOOL_NAME__",
        description="Auto-generated tool: __TOOL_NAME__"
    )
"""
        code = textwrap.dedent(template).strip()
        code = code.replace("__FUNCTION_CODE__", function_code)
        code = code.replace("__FUNC_NAME__", func_name)
        code = code.replace("__INPUTS_KEYS__", inputs_keys_str)
        code = code.replace("__GRADIO_OUTPUT__", gradio_output) # Dynamic component injection
        code = code.replace("__OUTPUT_DESC__", output_desc)
        code = code.replace("__TOOL_NAME__", tool_name)
        
        return code

    @staticmethod
    def generate_master_app() -> str:
        """
        Generates the main app.py file.
        Uses a standard approach with simple dynamic import.
        """
        template = """
import gradio as gr
import os
import sys
import importlib

# Configuration
TOOLS_DIR = "tools"

# Ensure tools directory exists and is a package
if not os.path.exists(TOOLS_DIR):
    os.makedirs(TOOLS_DIR, exist_ok=True)
    with open(os.path.join(TOOLS_DIR, "__init__.py"), "w") as f:
        pass

# Add current directory to path so 'import tools.xxx' works
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

interfaces = []
names = []

print(f"🚀 Starting Meta-MCP Toolbox...")
print(f"📂 Scanning '{TOOLS_DIR}' directory...")

# Scan and import tools
try:
    for filename in sorted(os.listdir(TOOLS_DIR)):
        if filename.endswith(".py") and not filename.startswith("_"):
            module_name = filename[:-3]
            full_module_name = f"{TOOLS_DIR}.{module_name}"
            
            try:
                print(f"  👉 Importing {full_module_name}...")
                # Standard dynamic import
                # Use reload to ensure latest version is taken if restarted
                module = importlib.import_module(full_module_name)
                importlib.reload(module)
                
                if hasattr(module, "create_interface"):
                    # Create Gradio interface for this tool
                    tool_interface = module.create_interface()
                    interfaces.append(tool_interface)
                    names.append(module_name)
                    print(f"  ✅ Loaded {module_name}")
                else:
                    print(f"  ⚠️ Module {module_name} has no create_interface()")
            except Exception as e:
                print(f"  ❌ Error loading {module_name}: {e}")
                import traceback
                traceback.print_exc()

except Exception as e:
    print(f"Error scanning tools directory: {e}")

# Final interface construction
if not interfaces:
    demo = gr.Interface(
        fn=lambda x: "No tools loaded yet. Add a tool via Meta-MCP!", 
        inputs="text", 
        outputs="text", 
        title="Empty Toolbox",
        description="This Space is ready to receive tools."
    )
else:
    demo = gr.TabbedInterface(interfaces, names)

if __name__ == "__main__":
    demo.launch(mcp_server=True, show_error=True)
"""
        return textwrap.dedent(template).strip()

    @staticmethod
    def generate_mcp_server_code(function_code: str) -> str:
        """
        Generates an MCP server (FastMCP) instead of Gradio (Future feature).
        """
        pass