Solution

src/app.js

@@ -1 +1,87 @@
 // write code here
+/* eslint-disable no-console */
+const fs = require('fs');
+const path = require('path');
+
+function moveFile() {
+  const [, , sourceArg, destinationArg] = process.argv;
+
+  if (!sourceArg || !destinationArg) {
+    console.error('Not enough parameters');
+
+    return;
+  }
+
+  const source = path.resolve(sourceArg);
+  const destination = path.resolve(destinationArg);
+  const isDestinationDirectory = destinationArg.endsWith(path.sep);
+
+  if (!fs.existsSync(source)) {
+    console.error('Source does not exist');
+
+    return;
+  }
+
+  const sourceStat = fs.statSync(source);
+
+  if (!sourceStat.isFile()) {
+    console.error('Source is not a file');
+
+    return;
+  }
+
+  if (isDestinationDirectory) {
+    if (!fs.existsSync(destination)) {
+      throw new Error('Destination directory does not exist');
+    }
+
+    const destStat = fs.statSync(destination);
+
+    if (!destStat.isDirectory()) {
+      console.error('Destination is not a directory');
+
+      return;
+    }
+
+    const finalPath = path.join(destination, path.basename(source));
+
+    fs.renameSync(source, finalPath);
+
+    return;
+  }
+
+  if (fs.existsSync(destination)) {
+    const destinationStat = fs.statSync(destination);
+
+    if (destinationStat.isDirectory()) {
+      const finalPath = path.join(destination, path.basename(source));
+
+      fs.renameSync(source, finalPath);
+
+      return;
+    }
+  }
+
+  if (isDestinationDirectory) {
+    if (
+      !fs.existsSync(destination) ||
+      !fs.statSync(destination).isDirectory()
+    ) {
+      throw new Error('Destination directory does not exist');
+    }
+  } else {
+    const parentDir = path.resolve(path.dirname(destination));
+
+    if (!fs.existsSync(parentDir) || !fs.statSync(parentDir).isDirectory()) {
+      console.error('Destination directory does not exist');
+
+      return;
+    }
+  }
+
+  fs.renameSync(source, destination);
+}
+
+moveFile();
+
+module.exports = { moveFile };