# dijkstra-backend

Dijkstra is an app thas uses Dijkstra algorithm to display the shortest path between different cities in Belgium.

Deployed backend: https://dijkstra-backend.herokuapp.com/

## API Documentation
___
> Values required in **`bold`**.

### COUNTRIES **`countries`**
| field    | data type         | metadata                                            |
| :--------| :---------------- | :-------------------------------------------------- |
| id       | unsigned integer  | primary key, auto-increments, generated by database |
| name     | string            |                                                     |

#### Get countries list
**`GET /api/countries/:country_id`**

##### Response
A json object with a list of cities in the selected country `name` and `id` and `country_id`.

```
[
  {
    "id": 1,
    "name": "bruges",
    "country_id": 1
  },
  {
    "id": 2,
    "name": "antwerp",
    "country_id": 1
  },
  {
    "id": 3,
    "name": "ghent",
    "country_id": 1
  },
]
```

### CITIES **`cities`**
| field      | data type              | metadata                                            |
| :----------| :--------------------- | :-------------------------------------------------- |
| id         | unsigned integer       | primary key, auto-increments, generated by database |
| name       | string                 |                                                     |
| country_id | unsigned integer       | foreign key referencing `countries.id`              |

#### Get cities list
**`GET /api/cities`**

##### Response
A json object with `id`, `name` and `country_id`.

```
{
  "id": 1,
  "name": 'bruges',
  "country_id": 1
}
```

### ROADS **`roads`**
| field         | data type        | metadata                                            |
| :-------------| :--------------- | :-------------------------------------------------- |
| id            | unsigned integer | primary key, auto-increments, generated by database |
| start_city_id | string           | required                                            |
| end_city_id   | string           | required                                            |
| distance      | unsigned integer |                                                     |

#### Get roads list
**`GET /api/roads`**

##### Response
A json object with `id`, `start_city_id`, 'end_city_id` and `distance`.

```
{
  "id": 1,
  "start_city_id": 1,
  "end_city_id": 3,
  "distance": 50
}
```

### Shortest Path **`cities`**

#### Get the shortest path between two cities and the total distance
**`GET /api/path`**

##### Request
Add the **`start_city_id`** and **`end_city_id`** as query strings to the url.

```
/api/path?start_city_id=2?end_city_id=9
```

##### Response
A json object composed of the `path` correctly ordered and the total `distance`.

```
{
  "path": [
    {
      "id": 2,
      "name": "antwerp"
    },
    {
      "id": 4,
      "name": "mechelen"
    },
    {
      "id": 5,
      "name": "brussels"
    },
    {
      "id": 8,
      "name": "liege"
    },
    {
      "id": 7,
      "name": "namur"
    },
    {
      "id": 9,
      "name": "arlon"
    }
  ],
  "distance": 337
}
```