notes_manager.py

import json
import os


FILE_NAME = "notes.json"


class NotesManager:

    def __init__(self):
        self.notes = self.load_notes()

    def load_notes(self):
        if not os.path.exists(FILE_NAME):
            return []

        with open(FILE_NAME, "r") as file:
            return json.load(file)

    def save_notes(self):
        with open(FILE_NAME, "w") as file:
            json.dump(self.notes, file, indent=4)
    
    
    def add_note(self):
        title = input("Enter note title: ").strip()
        content = input("Enter note content: ").strip()

        new_note = {
            "title": title,
            "content": content
        }

        self.notes.append(new_note)
        self.save_notes()

        print("Note added successfully! ✅")
    
    def view_notes(self):
        if not self.notes:
            print("No notes found.")
            return

        print("\n===== YOUR NOTES =====")

        for i, note in enumerate(self.notes, start=1):
            print(f"{i}. {note['title']}")
            print(f"   {note['content']}")
    
    
    def search_notes(self):
        keyword = input("Enter keyword to search: ").strip().lower()

        found = False

        for note in self.notes:
            if keyword in note["title"].lower() or keyword in note["content"].lower():
                print("\n===== NOTE FOUND =====")
                print(f"Title   : {note['title']}")
                print(f"Content : {note['content']}")
                found = True

        if not found:
            print("No matching notes found.")
            
    
    def update_note(self):
        self.view_notes()

        if not self.notes:
            return

        try:
            choice = int(input("Enter note number to update: "))

            if choice < 1 or choice > len(self.notes):
                print("Invalid note number.")
                return

            note = self.notes[choice - 1]

            new_title = input(f"Enter new title ({note['title']}): ").strip()
            new_content = input(f"Enter new content ({note['content']}): ").strip()

            if new_title:
                note["title"] = new_title

            if new_content:
                note["content"] = new_content

            self.save_notes()

            print("Note updated successfully! ✅")

        except ValueError:
            print("Please enter a valid number.")
    
    
    def delete_note(self):
        self.view_notes()

        if not self.notes:
            return

        try:
            choice = int(input("Enter note number to delete: "))

            if choice < 1 or choice > len(self.notes):
                print("Invalid note number.")
                return

            deleted_note = self.notes.pop(choice - 1)
            self.save_notes()

            print(f"Deleted: {deleted_note['title']} ✅")

        except ValueError:
            print("Please enter a valid number.")