const dotenv = require("dotenv");
const path = require("path");
const { outputProgress, formatElapsedTime } = require('./metrics/utils/progress');
const { setupConnections, closeConnections } = require('./import/utils');
const importCategories = require('./import/categories');
const { importProducts } = require('./import/products');
const importOrders = require('./import/orders');
const importPurchaseOrders = require('./import/purchase-orders');

dotenv.config({ path: path.join(__dirname, "../.env") });

// Constants to control which imports run
const IMPORT_CATEGORIES = false;
const IMPORT_PRODUCTS = false;
const IMPORT_ORDERS = false;
const IMPORT_PURCHASE_ORDERS = true;

// SSH configuration
const sshConfig = {
  ssh: {
    host: process.env.PROD_SSH_HOST,
    port: process.env.PROD_SSH_PORT || 22,
    username: process.env.PROD_SSH_USER,
    privateKey: process.env.PROD_SSH_KEY_PATH
      ? require("fs").readFileSync(process.env.PROD_SSH_KEY_PATH)
      : undefined,
  },
  // Production database configuration
  prodDbConfig: {
    host: process.env.PROD_DB_HOST || "localhost",
    user: process.env.PROD_DB_USER,
    password: process.env.PROD_DB_PASSWORD,
    database: process.env.PROD_DB_NAME,
    port: process.env.PROD_DB_PORT || 3306,
  },
  // Local database configuration
  localDbConfig: {
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME,
    multipleStatements: true,
    waitForConnections: true,
    connectionLimit: 10,
    queueLimit: 0,
    namedPlaceholders: true,
  }
};

let isImportCancelled = false;

// Add cancel function
function cancelImport() {
    isImportCancelled = true;
    outputProgress({
        status: 'cancelled',
        operation: 'Import process',
        message: 'Import cancelled by user',
        current: 0,
        total: 0,
        elapsed: null,
        remaining: null,
        rate: 0
    });
}

async function main() {
  const startTime = Date.now();
  let connections;
  let completedSteps = 0;
  const totalSteps = [
    IMPORT_CATEGORIES,
    IMPORT_PRODUCTS,
    IMPORT_ORDERS,
    IMPORT_PURCHASE_ORDERS
  ].filter(Boolean).length;

  try {
    // Initial progress update
    outputProgress({
      status: "running",
      operation: "Import process",
      message: "Initializing SSH tunnel...",
      current: completedSteps,
      total: totalSteps,
      elapsed: formatElapsedTime(startTime)
    });

    connections = await setupConnections(sshConfig);
    const { prodConnection, localConnection } = connections;

    if (isImportCancelled) throw new Error("Import cancelled");

    const results = {
      categories: null,
      products: null,
      orders: null,
      purchaseOrders: null
    };

    // Run each import based on constants
    if (IMPORT_CATEGORIES) {
      results.categories = await importCategories(prodConnection, localConnection);
      if (isImportCancelled) throw new Error("Import cancelled");
      completedSteps++;
    }

    if (IMPORT_PRODUCTS) {
      results.products = await importProducts(prodConnection, localConnection);
      if (isImportCancelled) throw new Error("Import cancelled");
      completedSteps++;
    }

    if (IMPORT_ORDERS) {
      results.orders = await importOrders(prodConnection, localConnection);
      if (isImportCancelled) throw new Error("Import cancelled");
      completedSteps++;
    }

    if (IMPORT_PURCHASE_ORDERS) {
      results.purchaseOrders = await importPurchaseOrders(prodConnection, localConnection);
      if (isImportCancelled) throw new Error("Import cancelled");
      completedSteps++;
    }

    const endTime = Date.now();
    const totalElapsedSeconds = Math.round((endTime - startTime) / 1000);
    outputProgress({
      status: "complete",
      operation: "Import process",
      message: `All imports completed successfully in ${formatElapsedTime(totalElapsedSeconds)}`,
      current: completedSteps,
      total: totalSteps,
      elapsed: formatElapsedTime(startTime),
      timing: {
        start_time: new Date(startTime).toISOString(),
        end_time: new Date(endTime).toISOString(),
        elapsed_time: formatElapsedTime(startTime),
        elapsed_seconds: totalElapsedSeconds,
        total_duration: formatElapsedTime(totalElapsedSeconds)
      },
      results
    });

    return results;
  } catch (error) {
    const endTime = Date.now();
    const totalElapsedSeconds = Math.round((endTime - startTime) / 1000);
    console.error("Error during import process:", error);
    outputProgress({
      status: error.message === "Import cancelled" ? "cancelled" : "error",
      operation: "Import process",
      message: error.message === "Import cancelled" 
        ? `Import cancelled by user after ${formatElapsedTime(totalElapsedSeconds)}`
        : `Import failed after ${formatElapsedTime(totalElapsedSeconds)}`,
      error: error.message,
      current: completedSteps,
      total: totalSteps,
      elapsed: formatElapsedTime(startTime),
      timing: {
        start_time: new Date(startTime).toISOString(),
        end_time: new Date(endTime).toISOString(),
        elapsed_time: formatElapsedTime(startTime),
        elapsed_seconds: totalElapsedSeconds,
        total_duration: formatElapsedTime(totalElapsedSeconds)
      }
    });
    throw error;
  } finally {
    if (connections) {
      await closeConnections(connections);
    }
  }
}

// Run the import only if this is the main module
if (require.main === module) {
  main().catch((error) => {
    console.error("Unhandled error in main process:", error);
    process.exit(1);
  });
}

// Export the functions needed by the route
module.exports = {
  main,
  cancelImport,
};