public/subjects/events/README.md

## events

### Instructions

You have to design a notification system for a platform.

Depending on the type of event, your event handler will control the size, color and position of the notification.

Create a method named `notify` which returns a `Notification` with the following characteristics for each of:
- `Remainder`:
  - `size`: `50`
  - `color`: `(50, 50, 50)`
  - `position`: `Bottom`
  - `content`: the slice associated to the enum value.
- `Registration(chrono::Duration)`:
  - `size`: `30`
  - `color`: `(255, 2, 22)`
  - `position`: `Top`
  - `content`: `"You have {duration} left before the registration ends"`
- `Appointment(text)`
  - `size: 100`
  - `color: (200, 200, 3)`
  - `position: Center`
  - `content: text associated to the value`
- `Holiday`
  - `size`: `25`
  - `color`: `(0, 255, 0)`
  - `position`: `Top`
  - `content`: `"Enjoy your holiday"`

`duration` must be displayed in the form of `{hours}H:{minutes}M:{seconds}S`. The time will represent the remaining time before the event starts. For example, if there are 2 hours, 32 minutes and 3 seconds left, then the content will be `"You have 13H:38M:14S left before the registration ends"`

Implement the `std::fmt::Display` trait so the text of the notifications are printed in the right color in the command line.


### Dependencies

chrono = "0.4"

### Expected Functions and Data Structures

```rust
use chrono::Duration;
use colored::*;

#[derive(Debug, Eq, PartialEq)]
enum Position {
	Top,
	Bottom,
	Center,
}

#[derive(Debug, Eq, PartialEq)]
struct Notification {
	size: u32,
	color: (u8, u8, u8),
	position: Position,
	content: String,
}

#[derive(Debug)]
enum Event<'a> {
	Remainder(&'a str),
	Registration(Duration),
	Appointment(&'a str),
	Holiday,
}

use std::fmt;

impl fmt::Display for Notification {
}

use Event::*;

impl Event {
	fn notify(&self) -> Notification {
	}
}
```

### Usage

Here is a program to test your function.

```rust
use events::Event::*;
use chrono::Duration;

fn main() {
	let remainder = Remainder("Go to the doctor");
	println!("{}", remainder.notify());
	let registration = Registration(Duration::seconds(49094));
	println!("{}", registration.notify());
	let appointment = Appointment("Go to the doctor");
	println!("{}", appointment.notify());
	let holiday = Holiday;
	println!("{}", holiday.notify());
}
```

And its output

```console
$ cargo run
(Bottom, 50, Go to the doctor)
(Top, 30, You have 13H:38M:14S left before the registration ends)
(Center, 100, Go to the doctor)
(Top, 25, Enjoy your holiday)
$
```

### Notions

- [colored crate](https://docs.rs/colored/2.0.0/colored/)
- [chrono crate](https://crates.io/crates/chrono)