import React, { useState, useCallback, useMemo, useContext, createContext } from 'react';
import api from './api'; // Import the centralized api
import ReactFlow, {
  MiniMap,
  Controls,
  Background,
  useNodesState,
  useEdgesState,
  addEdge,
} from 'reactflow';
import CustomNode from './CustomNode';
import InputNode from './InputNode';
import OutputNode from './OutputNode';
import RunNode from './RunNode';
import LogPanel from './LogPanel';
import { LogContext } from './LogContext';
import { HuggingfaceTokenProvider } from './HuggingfaceTokenContext';
import TokenInput from './TokenInput';

import 'reactflow/dist/style.css';
import './CustomNode.css';
import './InputNode.css';
import './OutputNode.css';
import './RunNode.css';
import './LogPanel.css';
import './TokenInput.css';

export const WorkflowContext = createContext();

const initialNodes = [];
const initialEdges = [];

let nodeIdCounter = 0;

function App() {
  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
  const [isRunning, setIsRunning] = useState(false);
  const { addLog } = useContext(LogContext);

  const nodeTypes = useMemo(() => ({ 
    custom: CustomNode,
    inputNode: InputNode,
    outputNode: OutputNode,
    runNode: RunNode,
  }), []);

  const onConnect = useCallback(
    (params) => {
      const { source, sourceHandle, target, targetHandle } = params;
      const sourceNode = nodes.find(n => n.id === source);
      const targetNode = nodes.find(n => n.id === target);

      addLog(`Attempting to connect ${sourceNode.type} ('${source}') to ${targetNode.type} ('${target}')`);

      if (sourceNode.type === 'runNode') {
        const newEdge = { ...params, animated: false, type: 'step', style: { stroke: '#28a745', strokeWidth: 2 } };
        setEdges((eds) => addEdge(newEdge, eds));
        addLog(`Connected Run trigger to ${targetNode.data.label || targetNode.id}`, 'SUCCESS');
        return;
      }

      if (targetNode.type === 'outputNode') {
        const sourceCompId = sourceHandle.replace('output-', '');
        const sourceOutput = sourceNode.data.outputs.find(o => String(o.id) === sourceCompId);
        
        if (sourceOutput) {
          // Get selected JSON path if this is a JSON output
          const isJsonOutput = sourceOutput.type.toLowerCase() === 'json';
          const jsonPath = isJsonOutput ? sourceNode.data.jsonPaths?.[sourceCompId] : null;
          
          const newEdge = { 
            ...params, 
            animated: true, 
            type: 'smoothstep',
            data: isJsonOutput ? { jsonPath } : undefined 
          };
          
          setEdges((eds) => addEdge(newEdge, eds));
          setNodes((nds) =>
            nds.map((node) => 
              node.id === target 
                ? { 
                    ...node, 
                    data: { 
                      ...node.data, 
                      connectedType: sourceOutput.type, 
                      label: `Result: ${sourceOutput.label}${jsonPath ? ` (${jsonPath})` : ''}` 
                    } 
                  } 
                : node
            )
          );
          
          const logMsg = isJsonOutput && jsonPath 
            ? `Connected ${sourceNode.data.label}'s output to Output Node using JSON path: ${jsonPath}`
            : `Connected ${sourceNode.data.label}'s output to Output Node.`;
          
          addLog(logMsg, 'SUCCESS');
        }
        return;
      }

      if (sourceNode.type === 'outputNode' && targetNode.type === 'custom') {
        // Mark this OutputNode as being used as a source
        setNodes((nds) =>
          nds.map((node) => 
            node.id === source 
              ? { ...node, data: { ...node.data, isSource: true } } 
              : node
          )
        );
        
        const targetCompId = targetHandle.replace('input-', '');
        const targetInput = targetNode.data.inputs.find(i => String(i.id) === targetCompId);
        const sourceOutputType = sourceNode.data.connectedType;

        // Enhanced connection validation - allow image to connect to text inputs
        const isTypeMatch = sourceOutputType === targetInput.type;
        const isImageToTextPrompt = 
          sourceOutputType === 'image' && 
          ['textbox', 'string', 'text'].includes(targetInput.type.toLowerCase()) &&
          (targetInput.name === 'prompt' || targetInput.label.toLowerCase().includes('prompt'));

        if (targetInput && sourceOutputType && (isTypeMatch || isImageToTextPrompt)) {
          const newEdge = { 
            ...params, 
            animated: true, 
            type: 'smoothstep',
            data: { 
              sourceType: sourceOutputType,  // Track the original source type
              conversionType: isImageToTextPrompt ? 'imageToText' : null
            }
          };
          
          setEdges((eds) => addEdge(newEdge, eds));
          setNodes((nds) =>
            nds.map((node) => {
              if (node.id === target) {
                const newConnections = { ...node.data.connections, targets: [...(node.data.connections?.targets || []), targetCompId] };
                return { ...node, data: { ...node.data, connections: newConnections } };
              }
              return node;
            })
          );
          
          if (isImageToTextPrompt) {
            addLog(`Connected Output Node with image to ${targetNode.data.label}'s '${targetInput.label}' input. The image URL will be used as prompt.`, 'INFO');
          } else {
            addLog(`Connected Output Node to ${targetNode.data.label}'s input '${targetInput.label}'.`, 'SUCCESS');
          }
        } else {
          addLog(`Connection failed: Incompatible types between Output (${sourceOutputType}) and Input (${targetInput?.type}).`, 'WARN');
        }
        return;
      }

      if (sourceNode.type === 'custom' && targetNode.type === 'custom') {
        const sourceCompId = sourceHandle.replace('output-', '');
        const targetCompId = targetHandle.replace('input-', '');
        const sourceOutput = sourceNode.data.outputs.find(o => String(o.id) === sourceCompId);
        const targetInput = targetNode.data.inputs.find(i => String(i.id) === targetCompId);

        if (sourceOutput && targetInput && sourceOutput.type === targetInput.type) {
          // Get selected JSON path if this is a JSON output
          const isJsonOutput = sourceOutput.type.toLowerCase() === 'json';
          const jsonPath = isJsonOutput ? sourceNode.data.jsonPaths?.[sourceCompId] : null;
          
          const newEdge = { 
            ...params, 
            animated: true, 
            type: 'smoothstep',
            data: isJsonOutput ? { jsonPath } : undefined 
          };
          
          setEdges((eds) => addEdge(newEdge, eds));
          setNodes((nds) =>
            nds.map((node) => {
              if (node.id === target) {
                const newConnections = { ...node.data.connections, targets: [...(node.data.connections?.targets || []), targetCompId] };
                return { ...node, data: { ...node.data, connections: newConnections } };
              }
              return node;
            })
          );
          
          const logMsg = isJsonOutput && jsonPath 
            ? `Connected ${sourceNode.data.label} to ${targetNode.data.label} using JSON path: ${jsonPath}`
            : `Connected ${sourceNode.data.label} to ${targetNode.data.label}.`;
            
          addLog(logMsg, 'SUCCESS');
        } else {
          addLog(`Connection failed: Incompatible types between ${sourceOutput?.type} and ${targetInput?.type}.`, 'WARN');
        }
      }
    },
    [nodes, setEdges, setNodes, addLog],
  );

  // Helper to check if an output node is used as a source
  const isOutputNodeUsedAsSource = useCallback((nodeId) => {
    return edges.some(edge => edge.source === nodeId && 
      nodes.find(n => n.id === nodeId)?.type === 'outputNode');
  }, [edges, nodes]);

  // Helper to extract image URL from various formats
  const extractImageUrl = (data) => {
    if (typeof data === 'string') {
      return data;
    } else if (Array.isArray(data) && typeof data[0] === 'string') {
      return data[0];
    } else if (typeof data === 'object' && data !== null) {
      return data.url || data.path || data.src || '';
    }
    return '';
  };

  const addNode = (type) => {
    const newId = `node-${nodeIdCounter++}`;
    let newNode;

    if (type === 'input') {
      newNode = { id: newId, type: 'inputNode', position: { x: Math.random() * 200, y: Math.random() * 200 }, data: { onLoad: getSpaceDetails } };
      addLog("Added new Space Node. Please provide a Hugging Face Space ID.", 'INFO');
    } else if (type === 'output') {
      newNode = { id: newId, type: 'outputNode', position: { x: Math.random() * 200 + 500, y: Math.random() * 200 }, data: { label: 'Output' } };
      addLog("Added new Output Node.", 'INFO');
    } else {
      newNode = { id: newId, type: 'runNode', position: { x: 50, y: Math.random() * 200 }, data: {} }; // No more onRun prop
      addLog("Added new Run Node. Connect it to start your workflow.", 'INFO');
    }
    setNodes((nds) => nds.concat(newNode));
  };

  const handleEndpointChange = useCallback((nodeId, newApiName) => {
    setNodes((nds) =>
      nds.map((node) => {
        if (node.id === nodeId) {
          const newEndpoint = node.data.endpoints.find(e => e.api_name === newApiName);
          if (newEndpoint) {
            addLog(`[${node.data.label}] Changed main API to: ${newApiName}`, 'INFO');
            const newData = {
              ...node.data,
              apiName: newEndpoint.api_name,
              inputs: newEndpoint.inputs,
              outputs: newEndpoint.outputs,
              connections: { targets: [] }, 
              status: null,
              result: null,
              jsonPaths: {}, // Reset JSON path selections on endpoint change
            };
            return { ...node, data: newData };
          }
        }
        return node;
      })
    );
    setEdges((eds) => eds.filter(edge => edge.target !== nodeId));
  }, [addLog, setNodes, setEdges]);

  // Handle JSON path selection changes
  const handleOutputPathChange = useCallback((nodeId, outputId, path) => {
    setNodes((nds) =>
      nds.map((node) => {
        if (node.id === nodeId) {
          // Store the selected path in the node data
          const jsonPaths = { ...(node.data.jsonPaths || {}), [outputId]: path };
          addLog(`[${node.data.label}] Set JSON path for output ${outputId} to: ${path}`, 'INFO');
          
          // Update the edges that use this output
          setEdges((eds) => 
            eds.map(edge => {
              if (edge.source === nodeId && edge.sourceHandle === `output-${outputId}`) {
                return { ...edge, data: { ...edge.data, jsonPath: path } };
              }
              return edge;
            })
          );
          
          return { ...node, data: { ...node.data, jsonPaths } };
        }
        return node;
      })
    );
  }, [addLog, setNodes, setEdges]);

  const getSpaceDetails = async (nodeIdToReplace, spaceId) => {
    addLog(`Fetching details for Space ID: ${spaceId}...`);
    setNodes(nds => nds.map(n => n.id === nodeIdToReplace ? { ...n, data: { ...n.data, error: null } } : n));

    try {
      const response = await api.get(`/space/?space_id=${spaceId}`);
      const { endpoints } = response.data;
      const preferredEndpoint = endpoints.find(e => e.is_preferred) || endpoints[0];
      
      if (preferredEndpoint) {
        const originalNode = nodes.find(n => n.id === nodeIdToReplace);
        const loadedNode = {
          id: nodeIdToReplace,
          type: 'custom',
          position: originalNode?.position || { x: 100, y: 100 },
          data: { 
            label: spaceId, 
            apiName: preferredEndpoint.api_name, 
            inputs: preferredEndpoint.inputs, 
            outputs: preferredEndpoint.outputs, 
            connections: { targets: [] },
            endpoints: endpoints,
            onEndpointChange: handleEndpointChange,
            onOutputPathChange: handleOutputPathChange, // Add the new callback
            jsonPaths: {}, // Initialize empty JSON paths
          },
        };
        setNodes((nds) => nds.map((node) => (node.id === nodeIdToReplace ? loadedNode : node)));
        addLog(`Successfully loaded Space: ${spaceId}. Main API: ${preferredEndpoint.api_name}`, 'SUCCESS');
      } else {
        throw new Error("No usable API endpoints found for this space.");
      }
    } catch (err) {
      const errorMessage = err.response?.data?.error || err.message || 'Failed to fetch space details.';
      addLog(`Failed to load Space: ${errorMessage}`, 'ERROR');
      setNodes(nds => nds.map(n => n.id === nodeIdToReplace ? { ...n, data: { ...n.data, error: errorMessage, onLoad: getSpaceDetails } } : n));
    }
  };

  // Find all nodes reachable from a starting node (for isolated workflow execution)
  const findReachableNodes = useCallback((startNodeId) => {
    const reachableNodes = new Set([startNodeId]);
    const nodesToProcess = [startNodeId];
    
    while (nodesToProcess.length > 0) {
      const currentNodeId = nodesToProcess.shift();
      
      // Find all edges where the current node is the source
      edges.forEach(edge => {
        if (edge.source === currentNodeId && !reachableNodes.has(edge.target)) {
          reachableNodes.add(edge.target);
          nodesToProcess.push(edge.target);
        }
      });
    }
    
    return Array.from(reachableNodes);
  }, [edges]);

  const resetNodeStatuses = () => {
    setNodes(nds => nds.map(n => {
      // If this is an OutputNode being used as a source, preserve its result
      if (n.type === 'outputNode' && isOutputNodeUsedAsSource(n.id)) {
        // Preserve the result but clear status and error
        const { status, error, ...restData } = n.data;
        return { ...n, data: { ...restData, isSource: true } };
      }
      
      // For all other nodes, clear status, result and error
      if (n.data && ('status' in n.data || 'result' in n.data || 'error' in n.data)) {
        const { status, result, error, ...restData } = n.data;
        return { ...n, data: restData };
      }
      return n;
    }));
  };

  const pollForResult = async (nodeId, jobId, executionResults, nodesMap) => {
    const node = nodesMap.get(nodeId);
    addLog(`[${node.data.label}] Polling for result (Job ID: ${jobId})...`);

    const processLogs = (logs) => {
      if (logs && logs.length > 0) {
        logs.forEach(logMsg => {
          addLog(`[BACKEND] ${logMsg}`, 'INFO');
        });
      }
    };

    const poll = async () => {
      try {
        const response = await api.get(`/result/${jobId}`);
        
        // Always process logs, whether the job is running or complete
        processLogs(response.data.logs);

        if (response.data.status === 'processing') {
          setTimeout(poll, 2000); // Continue polling
        } else if (response.data.status === 'completed') {
          addLog(`[${node.data.label}] Job completed successfully.`, 'SUCCESS');
          executionResults.set(nodeId, response.data.result);
          setNodes(nds => nds.map(n => n.id === nodeId ? { ...n, data: { ...n.data, status: 'success', result: response.data.result } } : n));
          await processNextNodes(nodeId, executionResults, nodesMap);
        } else if (response.data.status === 'error' || response.data.status === 'failed' || response.data.status === 'cancelled') {
           throw new Error(response.data.error || `Job ended with status: ${response.data.status}`);
        }
      } catch (e) {
        addLog(`[${node.data.label}] Polling failed: ${e.message}`, 'ERROR');
        setNodes(nds => nds.map(n => n.id === nodeId ? { ...n, data: { ...n.data, status: 'error', error: e.message } } : n));
      }
    };
    poll();
  };

  // Helper function to get a value from a JSON object using a path string
  const getValueByJsonPath = (obj, path) => {
    if (!path || path === '(entire object)') return obj;
    
    return path.split('.').reduce((prev, curr) => {
      return prev && prev[curr] !== undefined ? prev[curr] : undefined;
    }, obj);
  };

  const processNextNodes = async (currentNodeId, executionResults, nodesMap) => {
    const adj = new Map(nodes.map(n => [n.id, []]));
    edges.forEach(edge => {
      if (!adj.has(edge.source)) adj.set(edge.source, []);
      adj.get(edge.source).push({ nodeId: edge.target, edge });
    });

    const nextConnections = adj.get(currentNodeId) || [];
    addLog(`Processing next nodes for '${nodesMap.get(currentNodeId).data.label || currentNodeId}': ${nextConnections.length} found.`);
    
    for (const { nodeId, edge } of nextConnections) {
      await executeNode(nodesMap.get(nodeId), executionResults, nodesMap, edge);
    }
  };

  const executeNode = async (node, executionResults, nodesMap, incomingEdge = null) => {
    if (!node || executionResults.has(node.id)) return;

    addLog(`Executing node: ${node.data.label || node.type} (ID: ${node.id})`);
    setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'running' } } : n));

    try {
      if (node.type === 'runNode') {
        setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'success' } } : n));
        await processNextNodes(node.id, executionResults, nodesMap);
      } else if (node.type === 'inputNode') {
        addLog(`Node '${node.id}' is an unconfigured Space Node. Please load a Space ID to use it.`, 'WARN');
        setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'error', error: 'Unconfigured Node' } } : n));
        return;
      } else if (node.type === 'custom') {
        const apiInputs = await Promise.all(node.data.inputs.map(async (input) => {
          const incomingEdge = edges.find(e => e.target === node.id && e.targetHandle === `input-${input.id}`);
          if (incomingEdge) {
            const sourceNode = nodesMap.get(incomingEdge.source);
            
            // Special handling for OutputNode sources - get the result directly from the node data or executionResults
            if (sourceNode && sourceNode.type === 'outputNode') {
              // Get either the stored result or the latest execution result
              const sourceResult = sourceNode.data.result || executionResults.get(incomingEdge.source);
              
              if (sourceResult !== undefined) {
                const sourceOutputType = sourceNode.data.connectedType;
                addLog(`[${node.data.label}] Input '${input.label}' from Output Node (type: ${sourceOutputType})`, 'INFO');

                // Check if we need to convert an image to text (for prompt inputs)
                const isImageToTextConversion = 
                  incomingEdge.data?.conversionType === 'imageToTextPrompt' ||
                  (sourceOutputType === 'image' && 
                   ['textbox', 'string', 'text'].includes(input.type.toLowerCase()) && 
                   (input.name === 'prompt' || input.label.toLowerCase().includes('prompt')));

                if (isImageToTextConversion) {
                  // Extract the image URL and use it as the prompt text
                  const imageUrl = extractImageUrl(sourceResult);
                  addLog(`[${node.data.label}] Converting image to URL for prompt input: ${imageUrl}`, 'INFO');
                  return imageUrl;
                }
                
                return sourceResult;
              }
            } else if (sourceNode && sourceNode.type === 'custom') {
              const sourceResult = executionResults.get(incomingEdge.source);
              
              if (sourceResult !== undefined) {
                const outputId = incomingEdge.sourceHandle.replace('output-', '');
                let outputValue = Array.isArray(sourceResult) 
                  ? sourceResult[sourceNode.data.outputs.findIndex(o => String(o.id) === outputId)] 
                  : sourceResult;
                
                // Check if this is a JSON type with a path selection
                const output = sourceNode.data.outputs.find(o => String(o.id) === outputId);
                const isJsonOutput = output && output.type.toLowerCase() === 'json';
                const jsonPath = incomingEdge.data?.jsonPath;
                
                if (isJsonOutput && jsonPath && typeof outputValue === 'object') {
                  outputValue = getValueByJsonPath(outputValue, jsonPath);
                  addLog(`[${node.data.label}] Using JSON path '${jsonPath}' to extract from input '${input.label}'`);
                }
                
                addLog(`[${node.data.label}] Input '${input.label}' from Custom Node, using value: ${JSON.stringify(outputValue)}`, 'INFO');
                
                // If the value is a file path from an output node, we need to re-upload it for the next node.
                if (typeof outputValue === 'string' && (outputValue.startsWith('http') || outputValue.startsWith('/media'))) {
                  try {
                    addLog(`[${node.data.label}] Detected output file URL. Fetching and re-uploading for next stage...`);
                    const response = await fetch(outputValue);
                    const blob = await response.blob();
                    const fileName = outputValue.substring(outputValue.lastIndexOf('/') + 1);
                    const file = new File([blob], fileName);
                    
                    const formData = new FormData();
                    formData.append('file', file);
                    
                    const uploadResponse = await api.post('/upload/', formData, {
                      headers: { 'Content-Type': 'multipart/form-data' },
                    });
                    
                    addLog(`[${node.data.label}] File re-uploaded. New path: ${uploadResponse.data.path}`);
                    return uploadResponse.data.path;
                  } catch (e) {
                    addLog(`[${node.data.label}] Failed to re-upload file: ${e.message}`, 'ERROR');
                    return null; // Skip this input if re-upload fails
                  }
                }
                
                return outputValue;
              }
            }
          }
          
          // If no connection or the connection doesn't have a value, use the form value
          const controlId = `node-${node.id}-input-${input.id}`;
          const element = document.getElementById(controlId);
          if (!element) {
            addLog(`[${node.data.label}] Input '${input.label}' has no form element. Skipping.`, 'WARN');
            return null;
          }
          const value = element.type === 'checkbox' ? element.checked : element.value;
          addLog(`[${node.data.label}] Input '${input.label}' from form, using value: ${value}`, 'INFO');
          return value;
        }));

        const filteredInputs = apiInputs.filter(input => input !== null);

        // Check for required fields before sending the request
        const missingRequiredInputs = node.data.inputs
          .filter(input => input.required && !filteredInputs.some((_, index) => index === node.data.inputs.indexOf(input)))
          .map(input => input.name || input.label);
          
        if (missingRequiredInputs.length > 0) {
          throw new Error(`Missing required inputs: ${missingRequiredInputs.join(', ')}`);
        }

        addLog(`[${node.data.label}] Sending request to /predict/ with inputs: ${JSON.stringify(filteredInputs)}`);
        const response = await api.post('/predict/', {
          space_id: node.data.label,
          api_name: node.data.apiName,
          inputs: filteredInputs,
        });

        if (response.data.error) throw new Error(response.data.error);

        if (response.data.job_id) {
          setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'polling' } } : n));
          await pollForResult(node.id, response.data.job_id, executionResults, nodesMap);
        } else {
          addLog(`[${node.data.label}] Request successful, no job ID returned.`, 'SUCCESS');
          executionResults.set(node.id, response.data.result);
          setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'success', result: response.data.result } } : n));
          await processNextNodes(node.id, executionResults, nodesMap);
        }

      } else if (node.type === 'outputNode') {
        // If this OutputNode is being used as a source and already has content,
        // we should preserve its content and just add it to execution results
        if (node.data.isSource && node.data.result !== undefined && node.data.result !== null) {
          addLog(`[OutputNode: ${node.data.label}] Using existing content as source for downstream nodes`, 'INFO');
          // Add this node's result to executionResults so downstream nodes can use it
          executionResults.set(node.id, node.data.result);
          // Mark it as success without changing its content
          setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'success' } } : n));
        } else {
          // Original logic for displaying output from an incoming connection
          const incomingEdge = edges.find(e => e.target === node.id);
          if (incomingEdge) {
            const sourceNode = nodesMap.get(incomingEdge.source);
            if (sourceNode && sourceNode.type === 'custom') {
              const outputId = incomingEdge.sourceHandle.replace('output-', '');
              const sourceResult = executionResults.get(incomingEdge.source);
              let displayResult = Array.isArray(sourceResult) 
                ? sourceResult[sourceNode.data.outputs.findIndex(o => `output-${o.id}` === incomingEdge.sourceHandle)] 
                : sourceResult;
              
              // Check if this is a JSON type with a path selection
              const output = sourceNode.data.outputs.find(o => String(o.id) === outputId);
              const isJsonOutput = output && output.type.toLowerCase() === 'json';
              const jsonPath = incomingEdge.data?.jsonPath;
              
              if (isJsonOutput && jsonPath && typeof displayResult === 'object') {
                displayResult = getValueByJsonPath(displayResult, jsonPath);
                addLog(`[OutputNode] Using JSON path '${jsonPath}' to extract result`, 'INFO');
              }
              
              addLog(`[OutputNode] Displaying result: ${JSON.stringify(displayResult)}`, 'SUCCESS');
              
              // Store the result in node data and execution results
              setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'success', result: displayResult } } : n));
              executionResults.set(node.id, displayResult);
            }
          }
        }
        
        // Always process next nodes regardless of whether we're displaying or forwarding content
        await processNextNodes(node.id, executionResults, nodesMap);
      }
    } catch (e) {
      addLog(`Execution failed at node ${node.data.label || node.id}: ${e.message}`, 'ERROR');
      setNodes(nds => nds.map(n => n.id === node.id ? { ...n, data: { ...n.data, status: 'error', error: e.message } } : n));
    }
  };

  // Function to run workflow from a specific run node
  const handleRunFromNode = async (startNodeId) => {
    if (isRunning) {
      addLog("A workflow is already running. Please wait for it to complete.", 'WARN');
      return;
    }
    
    setIsRunning(true);
    
    try {
      addLog(`================== WORKFLOW RUNNING FROM NODE ${startNodeId} ==================`, 'INFO');
      resetNodeStatuses();
      
      // Get only the nodes reachable from this specific Run Node
      const reachableNodeIds = findReachableNodes(startNodeId);
      addLog(`This workflow includes ${reachableNodeIds.length} node(s)`, 'INFO');
      
      // Map of all nodes for easier access
      const nodesMap = new Map(nodes.map(n => [n.id, n]));
      // Track execution results
      const executionResults = new Map();
      
      // Start execution from the run node
      await executeNode(nodesMap.get(startNodeId), executionResults, nodesMap);
      
      addLog(`================== WORKFLOW COMPLETED ==================`, 'SUCCESS');
    } catch (error) {
      addLog(`Workflow execution failed: ${error.message}`, 'ERROR');
    } finally {
      setIsRunning(false);
    }
  };

  // For backward compatibility or general run
  const handleRun = async () => {
    // Find all run nodes
    const runNodes = nodes.filter(node => node.type === 'runNode');
    if (runNodes.length > 0) {
      // Run from the first run node found (for backward compatibility)
      await handleRunFromNode(runNodes[0].id);
    } else {
      addLog("No Run Nodes found in the workflow. Please add a Run Node.", 'WARN');
    }
  };

  return (
    <HuggingfaceTokenProvider>
      <div style={{ height: '100vh', width: '100vw', display: 'flex', flexDirection: 'column' }}>
        <div style={{ padding: '10px', borderBottom: '1px solid #eee', display: 'flex', justifyContent: 'space-between', alignItems: 'center', flexShrink: 0 }}>
          <div>
            <button onClick={() => addNode('run')}>+ Add Run Node</button>
            <button onClick={() => addNode('input')}>+ Add Space Node</button>
            <button onClick={() => addNode('output')}>+ Add Output Node</button>
          </div>
          <TokenInput />
        </div>
        <div style={{ flexGrow: 1, position: 'relative' }}>
          <WorkflowContext.Provider value={{ handleRun, handleRunFromNode, isRunning }}>
            <ReactFlow
              nodes={nodes}
              edges={edges}
              onNodesChange={onNodesChange}
              onEdgesChange={onEdgesChange}
              onConnect={onConnect}
              nodeTypes={nodeTypes}
            >
              <Controls />
              <MiniMap />
              <Background variant="dots" gap={12} size={1} />
            </ReactFlow>
          </WorkflowContext.Provider>
        </div>
        <LogPanel />
      </div>
    </HuggingfaceTokenProvider>
  );
}

export default App;