const fs = require('fs');
const path = require('path');
require('dotenv').config();

async function bootstrap() {
  console.log("=== STARTING N8N WORKFLOW BOOTSTRAP / KICKSTART ===");

  // 1. Fetch n8n API configuration from .agents/mcp_config.json
  const mcpConfigPath = path.join(__dirname, '../.agents/mcp_config.json');
  if (!fs.existsSync(mcpConfigPath)) {
    console.error("Error: .agents/mcp_config.json not found.");
    process.exit(1);
  }
  
  const mcpConfig = JSON.parse(fs.readFileSync(mcpConfigPath, 'utf8'));
  const n8nEnv = mcpConfig.mcpServers.n8n.env;
  const n8nUrl = n8nEnv.N8N_API_URL || "https://n8n.gaboggamer.online";
  const n8nApiKey = n8nEnv.N8N_API_KEY;

  if (!n8nApiKey) {
    console.error("Error: N8N_API_KEY is missing in mcp_config.json.");
    process.exit(1);
  }

  // 2. Fetch credentials dynamically to resolve AI accounts
  console.log("Fetching credentials from n8n to resolve AI accounts...");
  let deepSeekCred = null;
  let geminiCred = null;
  try {
    const credsRes = await fetch(`${n8nUrl}/api/v1/credentials`, {
      method: 'GET',
      headers: {
        'X-N8N-API-KEY': n8nApiKey
      }
    });
    if (credsRes.ok) {
      const credsData = await credsRes.json();
      const credentials = Array.isArray(credsData.data) ? credsData.data : (credsData.data.credentials || []);
      
      const deepSeekCreds = credentials.filter(c => c.type === 'deepSeekApi');
      if (deepSeekCreds.length > 0) {
        deepSeekCred = deepSeekCreds.find(c => c.name.toLowerCase().includes('deepseek')) || deepSeekCreds[0];
      }
      
      const geminiCreds = credentials.filter(c => c.type === 'googlePalmApi');
      if (geminiCreds.length > 0) {
        geminiCred = geminiCreds.find(c => c.name.toLowerCase().includes('gemini') || c.name.toLowerCase().includes('google')) || geminiCreds[0];
      }
      
      if (deepSeekCred) {
        console.log(`Resolved DeepSeek credential: "${deepSeekCred.name}" (ID: ${deepSeekCred.id})`);
      }
      if (geminiCred) {
        console.log(`Resolved Gemini credential: "${geminiCred.name}" (ID: ${geminiCred.id})`);
      }
    } else {
      console.warn(`Warning: Failed to fetch credentials. Status: ${credsRes.status}`);
    }
  } catch (err) {
    console.warn("Warning: Could not fetch credentials dynamically:", err.message);
  }

  // 3. Fetch project ID dynamically
  console.log("Fetching workflows list to resolve project ID...");
  const listRes = await fetch(`${n8nUrl}/api/v1/workflows`, {
    method: 'GET',
    headers: {
      'X-N8N-API-KEY': n8nApiKey
    }
  });

  if (!listRes.ok) {
    console.error(`Failed to list workflows from n8n. Status: ${listRes.status}`);
    process.exit(1);
  }

  const listData = await listRes.json();
  let projectId;
  const firstWf = listData.data.find(w => w.shared && w.shared.length > 0);
  if (firstWf) {
    projectId = firstWf.shared[0].projectId;
    console.log(`Resolved project ID dynamically: ${projectId}`);
  }

  const workflowsToBootstrap = [
    'sales_import_workflow.json',
    'settlement_calculation_workflow.json'
  ];

  for (const filename of workflowsToBootstrap) {
    console.log(`\n--- Bootstrapping workflow: ${filename} ---`);
    const workflowPath = path.join(__dirname, '../n8n', filename);
    if (!fs.existsSync(workflowPath)) {
      console.error(`Error: ${workflowPath} not found.`);
      continue;
    }

    const workflowJson = JSON.parse(fs.readFileSync(workflowPath, 'utf8'));
    const targetName = workflowJson.name;

    // Inject resolved credentials dynamically into the workflow JSON
    for (const node of workflowJson.nodes) {
      if (node.type === '@n8n/n8n-nodes-langchain.chainLlm') {
        // Find deepseek node and gemini node to map credentials
      }
      if (node.type === '@n8n/n8n-nodes-langchain.lmChatDeepSeek' && deepSeekCred) {
        node.credentials = {
          deepSeekApi: {
            id: deepSeekCred.id,
            name: deepSeekCred.name
          }
        };
        console.log(`Injected DeepSeek credential into node "${node.name}" in ${filename}`);
      }
      if (node.type === '@n8n/n8n-nodes-langchain.lmChatGoogleGemini' && geminiCred) {
        node.credentials = {
          googlePalmApi: {
            id: geminiCred.id,
            name: geminiCred.name
          }
        };
        console.log(`Injected Gemini credential into node "${node.name}" in ${filename}`);
      }
    }

    const existingWorkflow = listData.data.find(w => w.name === targetName);
    let workflowId;

    if (existingWorkflow) {
      workflowId = existingWorkflow.id;
      console.log(`Found existing workflow "${targetName}". ID: ${workflowId}. Updating...`);

      const updateRes = await fetch(`${n8nUrl}/api/v1/workflows/${workflowId}`, {
        method: 'PUT',
        headers: {
          'Content-Type': 'application/json',
          'X-N8N-API-KEY': n8nApiKey
        },
        body: JSON.stringify({
          name: targetName,
          nodes: workflowJson.nodes,
          connections: workflowJson.connections,
          settings: workflowJson.settings || {}
        })
      });

      if (!updateRes.ok) {
        console.error(`Failed to update workflow. Status: ${updateRes.status}`);
        process.exit(1);
      }
      console.log(`Workflow updated successfully!`);
    } else {
      console.log(`No existing workflow found for "${targetName}". Creating new workflow...`);

      const createRes = await fetch(`${n8nUrl}/api/v1/workflows`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-N8N-API-KEY': n8nApiKey
        },
        body: JSON.stringify({
          name: targetName,
          nodes: workflowJson.nodes,
          connections: workflowJson.connections,
          settings: workflowJson.settings || {},
          projectId
        })
      });

      if (!createRes.ok) {
        console.error(`Failed to create workflow. Status: ${createRes.status}`);
        process.exit(1);
      }

      const createData = await createRes.json();
      workflowId = createData.id;
      console.log(`Workflow created successfully! ID: ${workflowId}`);
    }

    // Activate the workflow
    console.log(`Activating workflow "${targetName}" (${workflowId})...`);
    const activateRes = await fetch(`${n8nUrl}/api/v1/workflows/${workflowId}/activate`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-N8N-API-KEY': n8nApiKey
      },
      body: JSON.stringify({})
    });

    if (!activateRes.ok) {
      console.error(`Warning: Failed to activate workflow. Status: ${activateRes.status}`);
    } else {
      console.log(`Workflow "${targetName}" activated and ready!`);
    }
  }

  console.log("\n=== N8N WORKFLOW BOOTSTRAP COMPLETED SUCCESSFULLY ===");
}

bootstrap().catch(err => {
  console.error("Fatal bootstrap error:", err);
  process.exit(1);
});