Solution

src/app.js

@@ -1 +1,95 @@
+/* eslint-disable no-console */
 // write code here
+const fs = require('fs/promises');
+const path = require('path');
+
+async function validateSource(source) {
+  const sourceStat = await fs.stat(source);
+
+  if (!sourceStat.isFile()) {
+    throw new Error('Source is not a file');
+  }
+}
+
+async function setDestPath(destination, source) {
+  let destPath;
+
+  if (destination.endsWith('/') || destination.endsWith(path.sep)) {
+    try {
+      const destStat = await fs.stat(destination);
+
+      if (!destStat.isDirectory()) {
+        throw new Error('Destination is not a directory!');
+      }
+      destPath = path.join(destination, path.basename(source));
+    } catch (error) {
+      throw new Error('Destination directory does not exist');
+    }
+  } else {
+    try {
+      const destStat = await fs.stat(destination);
+
+      if (destStat.isDirectory()) {
+        destPath = path.join(destination, path.basename(source));
+      } else {
+        destPath = destination;
+      }
+    } catch (error) {
+      const parentDir = path.dirname(destination);
+
+      try {
+        const parentStat = await fs.stat(parentDir);
+
+        if (!parentStat.isDirectory()) {
+          throw new Error('Destination parent is not a directory');
+        }
+        destPath = destination;
+      } catch (parentError) {
+        throw new Error('Destination directory does not exist');
+      }
+    }
+  }
+
+  return path.resolve(destPath);
+}
+
+async function main() {
+  const [source, destination] = process.argv.slice(2);
+
+  if (!source || !destination) {
+    console.error('Source and destination paths are required');
+
+    return;
+  }
+
+  const absoluteSource = path.resolve(source);
+  let destPath;
+
+  try {
+    destPath = await setDestPath(destination, absoluteSource);
+  } catch (error) {
+    console.error('Error with destination: ' + error.message);
+
+    return;
+  }
+
+  try {
+    await validateSource(absoluteSource);
+  } catch (error) {
+    console.error('Error validating source file: ' + error.message);
+
+    return;
+  }
+
+  if (absoluteSource === destPath) {
+    return;
+  }
+
+  try {
+    await fs.rename(absoluteSource, destPath);
+  } catch (error) {
+    console.error('Error moving file: ' + error.message);
+  }
+}
+
+main();