Soadad Almailo-Note App program(dart)

ex.dart

@@ -0,0 +1,174 @@
+import 'dart:io';
+
+class Note {
+  late String title;
+  late String content;
+
+  Note({
+    required this.title,
+    required this.content,
+  });
+}
+
+class NoteApp {
+  late List<Note> notes;
+
+  NoteApp() {
+    notes = [];
+  }
+
+  /// Displays the menu options for the note-taking app.
+  void displayMenu() {
+    print('\nNote Taking App Menu:');
+    print('1. Create a note');
+    print('2. Edit a note');
+    print('3. Delete a note');
+    print('4. Search for a note');
+    print('5. Display all notes');
+    print('6. Exit');
+  }
+
+  /// Creates a new note based on user input.
+  void createNote() {
+    try {
+      print('Enter note title:');
+      var title = stdin.readLineSync()!;
+      print('Enter note content (type "@" on a new line when done):');
+      var content = _readMultilineInput();
+      var note = Note(
+        title: title,
+        content: content,
+      );
+      notes.add(note);
+      print('Note created successfully!');
+    } catch (e) {
+      print('Error creating note: $e');
+    }
+  }
+
+  /// Edits an existing note based on user input.
+  void editNote() {
+    try {
+      print('Enter the title of the note to edit:');
+      var title = stdin.readLineSync()!;
+      var noteIndex = notes.indexWhere((note) => note.title == title);
+      if (noteIndex != -1) {
+        print('Original content:');
+        print(notes[noteIndex].content);
+        print('Enter new content (type "@" on a new line when done):');
+        var newContent = _readMultilineInput();
+        notes[noteIndex].content = newContent;
+        print('Note edited successfully!');
+      } else {
+        print('Note with title "$title" not found.');
+      }
+    } catch (e) {
+      print('Error editing note: $e');
+    }
+  }
+
+  /// Deletes an existing note based on user input.
+  void deleteNote() {
+    try {
+      print('Enter the title of the note to delete:');
+      var title = stdin.readLineSync()!;
+      var noteIndex = notes.indexWhere((note) => note.title == title);
+      if (noteIndex != -1) {
+        notes.removeAt(noteIndex);
+        print('Note deleted successfully!');
+      } else {
+        print('Note with title "$title" not found.');
+      }
+    } catch (e) {
+      print('Error deleting note: $e');
+    }
+  }
+
+  /// Searches for notes containing a specific term in their title or content.
+  void searchNote() {
+    try {
+      print('Enter search term (title or content):');
+      var term = stdin.readLineSync()!;
+      var matchingNotes = notes.where((note) =>
+          note.title.contains(term) || note.content.contains(term)).toList();
+      if (matchingNotes.isNotEmpty) {
+        print('Search results:');
+        matchingNotes.forEach((note) {
+          print('Title: ${note.title}');
+          print('Content: ${note.content}\n');
+        });
+      } else {
+        print('No notes found matching the search term.');
+      }
+    } catch (e) {
+      print('Error searching for note: $e');
+    }
+  }
+
+  /// Displays all existing notes.
+  void displayNotes() {
+    if (notes.isNotEmpty) {
+      print('All Notes:');
+      notes.forEach((note) {
+        print('Title: ${note.title}');
+        print('Content: ${note.content}\n');
+        print('###################');
+      });
+    } else {
+      print('No notes available.');
+    }
+  }
+
+  /// Reads multiline input until the user types "@" on a new line.
+  String _readMultilineInput() {
+    var inputLines = <String>[];
+    while (true) {
+      var line = stdin.readLineSync()!;
+      if (line.trim() == '@') {
+        break;
+      }
+      inputLines.add(line);
+    }
+    return inputLines.join('\n');
+  }
+
+  /// Runs the note-taking app.
+  void run() {
+    try {
+      var choice;
+      do {
+        displayMenu();
+        choice = stdin.readLineSync();
+        switch (choice) {
+          case '1':
+            createNote();
+            break;
+          case '2':
+            editNote();
+            break;
+          case '3':
+            deleteNote();
+            break;
+          case '4':
+            searchNote();
+            break;
+          case '5':
+            displayNotes();
+            break;
+          case '6':
+            print('Exiting...');
+            break;
+          default:
+            print('Invalid choice. Please try again.');
+        }
+      } while (choice != '6');
+    } catch (e) {
+      print('An unexpected error occurred: $e');
+    }
+  }
+}
+
+void main() {
+  var noteApp = NoteApp();
+  noteApp.run();
+}