Sure, I can help you with that! Here's a basic outline of how you could create a flutter to-do app with api requests to a backend restapi endpoint and user personalization:

1. Set up a backend restapi endpoint: You'll need to create a server-side application that can handle api requests and return the appropriate response. You can use any programming language you like, but for simplicity, let's assume you're using Node.js. You'll also need to set up a database to store user data.

2. Create a flutter app: In flutter, you'll create a new project and add the necessary packages for making api requests. You'll also set up user authentication and storage.

3. Make api requests: In your flutter app, you'll make api requests to your backend restapi endpoint to add, edit, and delete to-do items. You'll also handle errors and handle responses appropriately.

4. Personalize the app: You can personalize the app by storing user data locally on the device, such as their name, photo, and favorite colors. You can also use this data to display personalized notifications and reminders.

Here's some sample code to get you started:

Flutter:

```
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:io';
// ...
class ToDoApp extends StatefulWidget {
@override
_ToDoAppState createState() => _ToDoAppState();
}
class _ToDoAppState extends State {
List toDoItems = [];
String userName = '';
String userPhoto = '';
List favoriteColors = [];
@override
void initState() {
super.initState();
// ...
// Make api request to get user data
http.get('user.json').then((response) {
userName = response.body;
// ...
// Make api request to get favorite colors
http.get('favorite_colors.json').then((response) {
favoriteColors = response.body;
// ...
});
});
}
// ...
// Add to-do item
void addToDoItem(String item) {
toDoItems.add(item);
setState(() {});
// Make api request to save to-do item
http.post('to_do_items.json', {
'item': item,
'user_name': userName
}).then((response) {
// ...
});
}
// ...
// Edit to-do item
void editToDoItem(int index, String item) {
toDoItems[index] = item;
setState(() {});
// Make api request to save to-do item
http.put('to_do_items.json', {
'item': item,
'user_name': userName,
'index': index
}).then((response) {
// ...
});
}
// ...
// Delete to-do item
void deleteToDoItem(int index) {
toDoItems.removeAt(index);
setState(() {});
// Make api request to delete to-do item
http.delete('to_do_items.json', {
'user_name': userName,
'index': index
}).then((response) {
// ...
});
}
}
```

Backend restapi endpoint:

```

// ...
    // Get user data
    get('/user', (req, res) => {
    res.json(req.user);
    });
    // Get favorite colors
    get('/favorite_colors', (req, res) => {
    res.json(req.user.favorite_colors);
    });
    // Add to-do item
    post('/to_do_items', (req, res) => {
    const item = req.body.item;
    const userName = req.user.name;
    const toDoItems = req.user.toDoItems.push(item);
    res.json({
    success: true,
    message: 'To-do item added successfully!'
    });
    });
    // Edit to-do item
    put('/to_do_items', (req, res) => {
    const index = req.body.index;
    const item = req.body.item;
    const userName = req.user.name;
    const toDoItems = req.user.toDoItems.update(index, item);
    res.json({
    success: true,
    message: 'To-do item edited successfully!'
    });
    });
    // Delete to-do item
    delete('/to_do_items', (req, res) => {
    const index = req.body.index;
    const userName = req.user.name;
    const toDoItems = req.user.toDoItems.removeAt(index);
    res.json({
    success: true,
    message: 'To-do item deleted successfully!'
    });
    });

```

Note that this is just a basic outline and you'll need to fill in the details and handle errors appropriately. You'll also need to handle authentication and authorization appropriately to ensure that only authorized users can access certain features.

Sure, I can help you with that. Here's a basic outline of how you could implement a restapi for a to-do list using Flask:

1. Set up Flask: First, you'll need to install Flask using pip. Run `pip install Flask` in your terminal. Then, create a new Flask app using `python -m Flask appname`.

2. Set up routes: Define your routes using the `app.route` decorator. For example, to create a new to-do item, you could define a route like this:

@app.route('/to-do/int:id', methods=['PUT'])
    def edit_to_do(id):
    to_do = get_to_do(id)
    if request.method == 'PUT':
    to_do = request.json['data']
    update_to_do(to_do)
    return {'message': 'To-do item edited successfully.'}
    else:
    return {'message': 'Invalid request method.'}

This route accepts a `PUT` request with an `id` parameter, which represents the ID of the to-do item to edit. It retrieves the to-do item from the database using the `get_to_do` function, updates it with the data provided in the request, and returns a success message if the request is a `PUT` request. If the request is anything else, it returns an error message.

3. Set up authentication: To authenticate users, you could use Flask's built-in authentication features. For example, you could use sessions to store user data and require users to log in before accessing certain routes. Here's an example of how you could implement login:

from flask import Flask, request, redirect, url_for
    from flask_login import LoginManager, UserMixin, LoginFailed, UserMixin
    app = Flask(name)
    login_manager = LoginManager()
    login_manager.init_app(app)

    class ToDoList(UserMixin):
    pass

    login_manager.init_app(ToDoList())

    @login_manager.user_loader
    def user_loader(id):
    return ToDoList()

    @app.route('/login', methods=['GET', 'POST'])
    def login():
    if request.method == 'POST':
    username = request.form['username']
    password = request.form['password']
    user = UserMixin.authenticate(username, password)
    if user:
    return redirect(url_for('index'))
    return render_template('login.html')

    @app.route('/logout')
    def logout():
    login_manager.logout()
    return redirect(url_for('index'))

    @app.route('/to-do')
    def index():
    to_do_list = get_to_do_list()
    return render_template('index.html', to_do_list=to_do_list)

This code sets up a Flask app with a `ToDoList` class that implements the `UserMixin` from Flask-Login. It also defines a `user_loader` function that retrieves the user data from the database using the `UserMixin.authenticate` method.

The `login` route checks if the request method is `POST` and if the form data contains a username and password. If the user is authenticated, it redirects to the index page. If not, it renders the `login.html` template.

The `logout` route simply logs out the user using the `login_manager.logout` method.

4. Set up the database: To store the to-do items, you could use a database like SQLite or MySQL. Here's an example of how you could connect to a SQLite database using Flask-SQLAlchemy:

from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///to_do.db' db = SQLAlchemy(app)

This code sets up a Flask app with a SQLite database using Flask-SQLAlchemy. The `SQLAlchemy` class is used to create a database object that connects to the database using the `SQLALCHEMY_DATABASE_URI` configuration option.

5. Define the models: To define the models for the to-do items, you could use SQLAlchemy. Here's an example of how you could define a model for a to-do item:

 from flask_sqlalchemy import Column, Integer, String
    from flask_login import UserMixin
    class ToDoItem(db.Model, UserMixin):
    id = Column(Integer, primary_key=True)
    title = Column(String(50))
    completed = Column(Boolean, default=False)
    user_id = Column(Integer, ForeignKey('users.id'))
    user = db.relationship('UserMixin', backref='to_do_items')

This code defines a `ToDoItem` model that uses SQLAlchemy to define the columns for the to-do item. It also defines a `user_id` column that references the user ID in the database.

6. Define the views: To handle the HTTP requests, you could define the views using the `app.route` decorator. Here's an example of how you could define the views for the to-do list:

from flask import Flask, request, jsonify
    from flask_login import LoginManager, UserMixin, LoginFailed, UserMixin
    app = Flask(name)
    login_manager = LoginManager()
    login_manager.init_app(app)

    class ToDoList(UserMixin):
    pass

    login_manager.init_app(ToDoList())

    @login_manager.user_loader
    def user_loader(id):
    return ToDoList()

    @app.route('/login', methods=['GET', 'POST'])
    def login():
    if request.method == 'POST':
    username = request.form['username']
    password = request.form['password']
    user = UserMixin.authenticate(username, password)
    if user:
    return redirect(url_for('index'))
    return render_template('login.html')

    @app.route('/logout')
    def logout():
    login_manager.logout()
    return redirect(url_for('index'))

    @app.route('/to-do')
    def index():
    to_do_list = get_to_do_list()
    return render_template('index.html', to_do_list=to_do_list)

    @app.route('/to-do/int:id', methods=['PUT'])
    def edit_to_do(id):
    to_do = get_to_do(id)
    if request.method == 'PUT':
    to_do = request.json['data']
    update_to_do(to_do)
    return {'message': 'To-do item edited successfully'}
    return {'message': 'Invalid request method'}

    @app.route('/to-do/int:id', methods=['DELETE'])
    def delete_to_do(id):
    to_do = get_to_do(id)
    if request.method == 'DELETE':
    delete_to_do(to_do)
    return {'message': 'To-do item deleted successfully'}
    return {'message': 'Invalid request method'}

This code defines the `ToDoList` class that implements the `UserMixin` from Flask-Login. It also defines the `login` route that checks if the request method is `POST` and if the form data contains a username and password. If the user is authenticated, it redirects to the index page. If not, it renders the `login.html` template.

The `logout` route simply logs out the user using the `login_manager.logout` method.

The `index` route retrieves the to-do list using the `get_to_do_list` function and renders the `index.html` template with the `to_do_list` parameter.

The `edit_to_do` and `delete_to_do` routes handle PUT and DELETE requests for a specific to-do item. The `edit_to_do` route updates the to-do item with the data provided in the request body. The `delete_to_do` route deletes the to-do item with the ID provided in the request body.