"""
Tool Manager for CodeAct Agent.
Unified management system for all types of tools: local functions, decorated tools, and MCP tools.
"""

from typing import Dict, List, Optional, Callable, Any, Union
from enum import Enum
from dataclasses import dataclass
import re

# Import components
from .tool_registry import ToolRegistry, create_module2api_from_functions
from .mcp_manager import MCPManager


class ToolSource(Enum):
    """Enumeration of tool sources."""
    LOCAL = "local"
    DECORATED = "decorated"
    MCP = "mcp"
    ALL = "all"


@dataclass
class ToolInfo:
    """Comprehensive tool information."""
    name: str
    description: str
    source: ToolSource
    function: Optional[Callable] = None
    schema: Optional[Dict] = None
    server: Optional[str] = None  # For MCP tools
    module: Optional[str] = None
    required_parameters: List[Dict] = None
    optional_parameters: List[Dict] = None

    def __post_init__(self):
        if self.required_parameters is None:
            self.required_parameters = []
        if self.optional_parameters is None:
            self.optional_parameters = []


class ToolManager:
    """
    Unified tool management system for CodeAct Agent.

    Manages all types of tools:
    - Local functions (legacy function registry)
    - Decorated tools (@tool decorator)
    - MCP tools (Model Context Protocol)

    Provides a single, consistent interface for tool operations.
    """

    def __init__(self, console_display=None):
        """
        Initialize the ToolManager.

        Args:
            console_display: Optional console display for MCP status output
        """
        # Core components
        self.tool_registry = ToolRegistry()
        self.mcp_manager = MCPManager(console_display)

        # Unified tool catalog
        self._tool_catalog: Dict[str, ToolInfo] = {}

        # Legacy function registry (for backward compatibility)
        self._legacy_functions: Dict[str, Callable] = {}

        # Initialize with decorated tools from function_tools.py
        self._discover_decorated_tools()

    # ====================
    # CORE TOOL MANAGEMENT
    # ====================

    def add_tool(self, tool: Union[Callable, Dict], name: str = None,
                 description: str = None, source: ToolSource = ToolSource.LOCAL) -> bool:
        """
        Add a tool to the manager.

        Args:
            tool: Either a callable function or a tool schema dict
            name: Optional custom name (defaults to function.__name__)
            description: Optional description (defaults to function.__doc__)
            source: Source type of the tool

        Returns:
            True if successfully added
        """
        try:
            if callable(tool):
                # Handle callable functions
                tool_name = name or tool.__name__
                tool_desc = description or tool.__doc__ or f"Function {tool.__name__}"

                # Add to tool registry
                success = self.tool_registry.add_function_directly(tool_name, tool, tool_desc)

                if success:
                    # Create ToolInfo and add to catalog
                    tool_info = ToolInfo(
                        name=tool_name,
                        description=tool_desc,
                        source=source,
                        function=tool,
                        schema=self._create_schema_from_function(tool_name, tool, tool_desc)
                    )
                    self._tool_catalog[tool_name] = tool_info

                    if source == ToolSource.LOCAL:
                        self._legacy_functions[tool_name] = tool

                    return True

            elif isinstance(tool, dict):
                # Handle tool schema dictionaries
                tool_name = tool.get("name") or name
                tool_desc = tool.get("description") or description

                if not tool_name:
                    print("Warning: Tool schema must have a name")
                    return False

                # Register with tool registry
                success = self.tool_registry.register_tool(tool)

                if success:
                    tool_info = ToolInfo(
                        name=tool_name,
                        description=tool_desc,
                        source=source,
                        schema=tool,
                        required_parameters=tool.get("required_parameters", []),
                        optional_parameters=tool.get("optional_parameters", [])
                    )
                    self._tool_catalog[tool_name] = tool_info
                    return True

            return False

        except Exception as e:
            print(f"Error adding tool {name}: {e}")
            return False

    def remove_tool(self, name: str) -> bool:
        """Remove a tool by name from all registries."""
        try:
            success = False

            # Remove from tool registry
            if self.tool_registry.remove_tool_by_name(name):
                success = True

            # Remove from MCP if it's an MCP tool
            if name in self.mcp_manager.mcp_functions:
                if self.mcp_manager.remove_mcp_tool(name, self.tool_registry):
                    success = True

            # Remove from legacy functions
            if name in self._legacy_functions:
                del self._legacy_functions[name]
                success = True

            # Remove from catalog
            if name in self._tool_catalog:
                del self._tool_catalog[name]
                success = True

            return success

        except Exception as e:
            print(f"Error removing tool {name}: {e}")
            return False

    def get_tool(self, name: str) -> Optional[ToolInfo]:
        """Get comprehensive tool information by name."""
        return self._tool_catalog.get(name)

    def get_tool_function(self, name: str) -> Optional[Callable]:
        """Get the actual function object by name."""
        tool_info = self.get_tool(name)
        if tool_info and tool_info.function:
            return tool_info.function

        # Check tool registry
        return self.tool_registry.get_function_by_name(name)

    # ====================
    # TOOL DISCOVERY AND LISTING
    # ====================

    def list_tools(self, source: ToolSource = ToolSource.ALL,
                   include_details: bool = False) -> List[Dict]:
        """
        List tools with optional filtering by source.

        Args:
            source: Filter by tool source (LOCAL, DECORATED, MCP, ALL)
            include_details: Whether to include detailed information

        Returns:
            List of tool dictionaries
        """
        tools = []

        for tool_name, tool_info in self._tool_catalog.items():
            if source == ToolSource.ALL or tool_info.source == source:
                if include_details:
                    tools.append({
                        "name": tool_info.name,
                        "description": tool_info.description,
                        "source": tool_info.source.value,
                        "server": tool_info.server,
                        "module": tool_info.module,
                        "has_function": tool_info.function is not None,
                        "required_params": len(tool_info.required_parameters),
                        "optional_params": len(tool_info.optional_parameters)
                    })
                else:
                    tools.append({
                        "name": tool_info.name,
                        "description": tool_info.description,
                        "source": tool_info.source.value
                    })

        return sorted(tools, key=lambda x: x["name"])

    def search_tools(self, query: str, search_descriptions: bool = True) -> List[Dict]:
        """
        Search tools by name and optionally description.

        Args:
            query: Search query (supports regex)
            search_descriptions: Whether to also search in descriptions

        Returns:
            List of matching tools
        """
        pattern = re.compile(query, re.IGNORECASE)
        matching_tools = []

        for tool_name, tool_info in self._tool_catalog.items():
            match = False

            # Search in name
            if pattern.search(tool_name):
                match = True

            # Search in description if enabled
            elif search_descriptions and pattern.search(tool_info.description or ""):
                match = True

            if match:
                matching_tools.append({
                    "name": tool_info.name,
                    "description": tool_info.description,
                    "source": tool_info.source.value,
                    "server": tool_info.server
                })

        return sorted(matching_tools, key=lambda x: x["name"])

    def get_tools_by_source(self, source: ToolSource) -> Dict[str, ToolInfo]:
        """Get all tools from a specific source."""
        return {
            name: tool_info
            for name, tool_info in self._tool_catalog.items()
            if tool_info.source == source
        }

    # ====================
    # MCP INTEGRATION
    # ====================

    def add_mcp_server(self, config_path: str = "./mcp_config.yaml") -> None:
        """Add MCP tools from configuration file."""
        try:
            # Use MCP manager to load tools
            self.mcp_manager.add_mcp(config_path, self.tool_registry)

            # Update our catalog with MCP tools
            mcp_tools = self.mcp_manager.list_mcp_tools()
            for tool_name, tool_data in mcp_tools.items():
                tool_info = ToolInfo(
                    name=tool_name,
                    description=tool_data.get("description", "MCP tool"),
                    source=ToolSource.MCP,
                    function=tool_data.get("function"),
                    server=tool_data.get("server"),
                    module=tool_data.get("module"),
                    required_parameters=tool_data.get("required_parameters", []),
                    optional_parameters=tool_data.get("optional_parameters", [])
                )
                self._tool_catalog[tool_name] = tool_info

        except Exception as e:
            print(f"Error adding MCP server: {e}")

    def list_mcp_servers(self) -> Dict[str, List[str]]:
        """List all MCP servers and their tools."""
        mcp_tools = self.get_tools_by_source(ToolSource.MCP)
        servers = {}

        for tool_name, tool_info in mcp_tools.items():
            server_name = tool_info.server or "unknown"
            if server_name not in servers:
                servers[server_name] = []
            servers[server_name].append(tool_name)

        return servers

    def show_mcp_status(self) -> None:
        """Display detailed MCP status."""
        self.mcp_manager.show_mcp_status()

    def get_mcp_summary(self) -> Dict[str, Any]:
        """Get MCP tools summary."""
        return self.mcp_manager.get_mcp_summary()

    # ====================
    # TOOL EXECUTION SUPPORT
    # ====================

    def get_all_functions(self) -> Dict[str, Callable]:
        """Get all available functions as a dictionary."""
        functions = {}

        # Add from tool registry
        functions.update(self.tool_registry.get_all_functions())

        # Add from legacy functions
        functions.update(self._legacy_functions)

        # Add MCP functions
        mcp_tools = self.mcp_manager.list_mcp_tools()
        for tool_name, tool_data in mcp_tools.items():
            if tool_data.get("function"):
                functions[tool_name] = tool_data["function"]

        return functions

    def get_tool_schemas(self, openai_format: bool = True) -> List[Dict]:
        """
        Get tool schemas for all tools.

        Args:
            openai_format: Whether to format as OpenAI function schemas

        Returns:
            List of tool schemas
        """
        schemas = []

        for tool_name, tool_info in self._tool_catalog.items():
            if openai_format:
                # Convert to OpenAI function schema format
                schema = {
                    "type": "function",
                    "function": {
                        "name": tool_info.name,
                        "description": tool_info.description,
                        "parameters": {
                            "type": "object",
                            "properties": {},
                            "required": []
                        }
                    }
                }

                # Add required parameters
                for param in tool_info.required_parameters:
                    param_schema = {
                        "type": param.get("type", "string"),
                        "description": param.get("description", "")
                    }
                    # Add enum values if present
                    if "enum" in param:
                        param_schema["enum"] = param["enum"]
                    schema["function"]["parameters"]["properties"][param["name"]] = param_schema
                    schema["function"]["parameters"]["required"].append(param["name"])

                # Add optional parameters
                for param in tool_info.optional_parameters:
                    param_schema = {
                        "type": param.get("type", "string"),
                        "description": param.get("description", "")
                    }
                    # Add enum values if present
                    if "enum" in param:
                        param_schema["enum"] = param["enum"]
                    if "default" in param:
                        param_schema["default"] = param["default"]
                    schema["function"]["parameters"]["properties"][param["name"]] = param_schema

                schemas.append(schema)
            else:
                # Return raw schema
                if tool_info.schema:
                    schemas.append(tool_info.schema)

        return schemas

    # ====================
    # STATISTICS AND REPORTING
    # ====================

    def get_tool_statistics(self) -> Dict[str, Any]:
        """Get comprehensive tool statistics."""
        stats = {
            "total_tools": len(self._tool_catalog),
            "by_source": {source.value: 0 for source in ToolSource if source != ToolSource.ALL},
            "with_functions": 0,
            "mcp_servers": len(self.list_mcp_servers()),
            "tool_registry_size": len(self.tool_registry.tools),
            "legacy_functions": len(self._legacy_functions)
        }

        for tool_info in self._tool_catalog.values():
            stats["by_source"][tool_info.source.value] += 1
            if tool_info.function:
                stats["with_functions"] += 1

        return stats

    def validate_tools(self) -> Dict[str, List[str]]:
        """Validate all tools and return any issues found."""
        issues = {
            "missing_functions": [],
            "missing_descriptions": [],
            "duplicate_names": [],
            "invalid_schemas": []
        }

        seen_names = set()
        for tool_name, tool_info in self._tool_catalog.items():
            # Check for duplicates
            if tool_name in seen_names:
                issues["duplicate_names"].append(tool_name)
            seen_names.add(tool_name)

            # Check for missing functions (except MCP tools which may not have direct functions)
            if not tool_info.function and tool_info.source != ToolSource.MCP:
                issues["missing_functions"].append(tool_name)

            # Check for missing descriptions
            if not tool_info.description or tool_info.description.strip() == "":
                issues["missing_descriptions"].append(tool_name)

        return issues

    # ====================
    # PRIVATE METHODS
    # ====================

    def _discover_decorated_tools(self) -> None:
        """Discover and register tools marked with @tool decorator."""
        try:
            from .builtin_tools import get_all_tool_functions

            tool_functions = get_all_tool_functions()
            for func in tool_functions:
                name = getattr(func, '_tool_name', func.__name__)
                description = getattr(func, '_tool_description', func.__doc__ or f"Function {func.__name__}")

                tool_info = ToolInfo(
                    name=name,
                    description=description,
                    source=ToolSource.DECORATED,
                    function=func,
                    schema=self._create_schema_from_function(name, func, description)
                )
                self._tool_catalog[name] = tool_info

                # Also add to tool registry for consistency
                self.tool_registry.add_function_directly(name, func, description)

        except ImportError:
            print("Warning: Could not import builtin_tools module for decorated tool discovery")

    def _create_schema_from_function(self, name: str, function: Callable, description: str) -> Dict:
        """Create a tool schema from a function object."""
        return self.tool_registry._create_schema_from_function(name, function, description)

    def _refresh_catalog(self) -> None:
        """Refresh the tool catalog from all sources."""
        # Clear current catalog
        self._tool_catalog.clear()

        # Re-discover decorated tools
        self._discover_decorated_tools()

        # Re-add MCP tools
        mcp_tools = self.mcp_manager.list_mcp_tools()
        for tool_name, tool_data in mcp_tools.items():
            tool_info = ToolInfo(
                name=tool_name,
                description=tool_data.get("description", "MCP tool"),
                source=ToolSource.MCP,
                function=tool_data.get("function"),
                server=tool_data.get("server"),
                module=tool_data.get("module"),
                required_parameters=tool_data.get("required_parameters", []),
                optional_parameters=tool_data.get("optional_parameters", [])
            )
            self._tool_catalog[tool_name] = tool_info

    # ====================
    # LEGACY COMPATIBILITY
    # ====================

    def add_legacy_functions(self, functions: Dict[str, Callable]) -> int:
        """Add legacy functions for backward compatibility."""
        added_count = 0
        for name, func in functions.items():
            if self.add_tool(func, name, source=ToolSource.LOCAL):
                added_count += 1
        return added_count