from typing import Dict, Any
from langchain_core.messages import ToolMessage
import json
import logging

logger = logging.getLogger("ReAct Tool Execution")


def _get_tools_from_registry(workflow_id: int):
    """
    Get tools from the global registry using workflow ID.
    This avoids storing non-serializable tool objects in state.
    """
    from ComputeAgent.graph.graph_ReAct import _TOOLS_REGISTRY
    tools = _TOOLS_REGISTRY.get(workflow_id)
    if tools is None:
        raise ValueError(f"Tools not found in registry for workflow_id: {workflow_id}")
    return tools


async def tool_execution_node(state: Dict[str, Any]) -> Dict[str, Any]:
    """
    Node that executes approved tools and handles special researcher tool case.
    
    Args:
        state: Current ReAct state with approved tool calls
        
    Returns:
        Updated state with tool results and special handling for researcher
    """
    approved_calls = state.get("approved_tool_calls", [])

    if not approved_calls:
        logger.info("ℹ️ No approved tool calls to execute")
        return state

    # Get tools from registry using workflow_id (avoids serialization issues)
    workflow_id = state.get("workflow_id")
    if not workflow_id:
        logger.error("❌ No workflow_id in state - cannot retrieve tools")
        return state

    try:
        tools = _get_tools_from_registry(workflow_id)
        tools_dict = {tool.name: tool for tool in tools}
        logger.info(f"✅ Retrieved {len(tools)} tools from registry")
    except ValueError as e:
        logger.error(f"❌ {e}")
        return state

    tool_results = []
    researcher_executed = False
    instance_created = False

    logger.info(f"⚡ Executing {len(approved_calls)} approved tool call(s)")

    for tool_call in approved_calls:
        tool_name = tool_call['name']

        try:
            tool = tools_dict.get(tool_name)
            if not tool:
                error_msg = f"Error: Tool {tool_name} not found."
                logger.error(error_msg)
                tool_results.append(
                    ToolMessage(
                        content=error_msg,
                        tool_call_id=tool_call['id']
                    )
                )
                continue

            logger.info(f"🔄 Executing tool: {tool_name}")
            result = await tool.ainvoke(tool_call['args'])

            # Special handling for create_compute_instance tool
            if tool_name == "create_compute_instance":
                instance_created = True
                logger.info("🚀 create_compute_instance tool executed - storing instance details")

                # Extract instance_id and status from result
                # Result may be a string containing JSON or a dict
                try:
                    logger.info(f"📋 Raw result type: {type(result)}, value: {result}")

                    if isinstance(result, str):
                        # Parse JSON string to dict
                        result_dict = json.loads(result)
                    elif isinstance(result, dict):
                        result_dict = result
                    else:
                        result_dict = {}

                    # The result may be nested in a 'result' key
                    if "result" in result_dict and isinstance(result_dict["result"], dict):
                        instance_data = result_dict["result"]
                    else:
                        instance_data = result_dict

                    instance_id = instance_data.get("id", "")
                    instance_status = str(instance_data.get("status", ""))

                    logger.info(f"📋 Extracted instance_id: '{instance_id}', status: '{instance_status}'")

                    # Store in state for generate node
                    state["instance_id"] = instance_id
                    state["instance_status"] = instance_status
                    state["instance_created"] = True

                    logger.info(f"✅ Instance created and stored in state: {instance_id} (status: {instance_status})")
                except (json.JSONDecodeError, AttributeError) as e:
                    logger.warning(f"⚠️ Could not parse result from create_compute_instance: {e}")
                    logger.warning(f"⚠️ Result: {result}")
                    state["instance_created"] = False

                # Store the result for tool results
                tool_results.append(
                    ToolMessage(
                        content=str(result),
                        tool_call_id=tool_call['id']
                    )
                )

            # Special handling for researcher tool
            elif tool_name == "research":
                researcher_executed = True
                logger.info("🌐 Researcher tool executed - storing results for generation")

                # Set flag to indicate researcher was used
                state["researcher_used"] = True

                # Store the research result for the generate node to use
                tool_results.append(
                    ToolMessage(
                        content=str(result),
                        tool_call_id=tool_call['id']
                    )
                )

                logger.info("✅ Researcher tool completed - results stored for generation")
            else:
                # Regular tool execution
                tool_results.append(
                    ToolMessage(
                        content=str(result),
                        tool_call_id=tool_call['id']
                    )
                )
                logger.info(f"✅ Tool {tool_name} executed successfully")
                
        except Exception as e:
            error_msg = f"Error executing tool {tool_name}: {str(e)}"
            logger.error(error_msg)
            tool_results.append(
                ToolMessage(
                    content=error_msg,
                    tool_call_id=tool_call['id']
                )
            )
    
    # Update state with execution results
    updated_state = state.copy()

    # Append new tool results to existing ones for multi-tool scenarios
    existing_results = updated_state.get("tool_results", [])
    updated_state["tool_results"] = existing_results + tool_results

    updated_state["messages"] = state["messages"] + tool_results
    updated_state["approved_tool_calls"] = []  # Clear approved calls
    updated_state["researcher_executed"] = researcher_executed
    updated_state["skip_refinement"] = researcher_executed  # Skip refinement if researcher executed
    updated_state["current_step"] = "tool_execution_complete"

    # Ensure instance creation flags are preserved in updated_state
    if state.get("instance_created"):
        updated_state["instance_created"] = state["instance_created"]
        updated_state["instance_id"] = state.get("instance_id", "")
        updated_state["instance_status"] = state.get("instance_status", "")
        logger.info(f"✅ Instance creation flags preserved in state: {updated_state['instance_id']}")

    # Clear force_refinement flag after tool execution
    if "force_refinement" in updated_state:
        del updated_state["force_refinement"]

    # NOTE: Don't remove tools here - agent_reasoning needs them next
    # Tools are only removed in terminal nodes (generate, tool_rejection_exit)

    logger.info(f"📈 Tool execution completed: {len(tool_results)} new results, {len(updated_state['tool_results'])} total results")

    return updated_state