# Address book

This will be a command line program for managing and searching contacts in an address book.

## How to run Ruby code

1) Write Ruby code in a file `<filename>.rb`

2) On command line, run

```shell
ruby <filename>.rb
```

## Requirements

### Program flow

The program will print

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
```

when it starts up, and after every executed action.

For almost all actions, it's going to ask and get user inputs like this,

```shell
(PRINT) Select an action: list | search | create | edit <ID> | delete <ID>
(GET INPUT) delete 1
(PRINT) Are you sure to delete this contact? (Yes/No)
(GET INPUT) Yes
(PRINT) The contact has been deleted.
```

### Create a contact

I should be able to create a contact and store it. Contact attributes are:

- First name
- Last name
- Phone number
- Email

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
create
Please fill out the contact attributes.
First name:
John
Last name:
Smith
Phone number:
000-000-0000
Email:
fake@email.com
The contact has been created.
```

### List contacts

I should be able to list all the contacts with their IDs (i.e. ordinal numbers).

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
list
1, John Smith, 000-000-0000, fake@email.com
2, Linda Vasquez, 111-111-111, fake2@email.com
```

If the list is empty,

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
list
The list is empty.
```

### Edit a contact

I should be able to edit an existing contact's attributes by its ID.

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
edit 1
Please fill out the contact attributes.
First name:
John
Last name:
Anderson
Phone number:
222-222-2222
Email:
fake@email.com
The contact has been updated.
```

If a contact doesn't exist with the given ID,

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
edit 5
Contact not found.
```

### Delete a contact

I should be able to delete a contact by its ID.

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
delete 1
Are you sure to delete this contact? (Yes/No)
Yes
The contact has been deleted.
```

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
delete 1
Are you sure to delete this contact? (Yes/No)
No
```

If a contact doesn't exist with the given ID,

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
delete 5
Contact not found.
```

After deletion, the IDs of the contacts following the deleted contact should be adjusted.

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
list
1, John Smith, 000-000-0000, fake@email.com
2, Linda Vasquez, 111-111-111, fake2@email.com
Select an action: list | search | create | edit <ID> | delete <ID>
delete 1
Are you sure to delete this contact? (Yes/No)
Yes
The contact has been deleted.
Select an action: list | search | create | edit <ID> | delete <ID>
list
1, Linda Vasquez, 111-111-111, fake2@email.com
```

### Search contacts

I should be able to search contacts by first name and last name.

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
search
First name:
John
Last name:

1, John Smith, 000-000-0000, fake@email.com
4, John Anderson, 111-111-1111, fake2@email.com
19, John Underwood, 222-222-2222, fake3@email.com
```

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
search
First name:
John
Last name:
Underwood
19, John Underwood, 222-222-2222, fake3@email.com
```

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
search
First name:

Last name:
Underwood
17, Alex Underwood, 444-444-4444, fake4@email.com
19, John Underwood, 222-222-2222, fake3@email.com
```

```shell
Select an action: list | search | create | edit <ID> | delete <ID>
search
First name:

Last name:

No results found.
```