# Device

## Activate

To activate the current device for data collection, the following API can be used.

#### Concrete Example

{% tabs %}
{% tab title="Swift" %}

```swift
let service = DeviceService()
service.activate(then: { result in
    switch result {
    case: .success(_)
        // activation successful
    case: .failure(_)
        // failure error
    }
})
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
val service = DeviceService()
service.activate() { result: Result<Content?>? ->
    if (result?.value == null || result.throwable != null) {
        // failure
    } else {
        // Success
        val content = result.value
    }
})
```

{% endtab %}
{% endtabs %}

## Deactivate

Deactivate the current device for data collection. It may be desirable to deactivate a device if the host application's user logs out, or if the user becomes inactive.

To deactivate the current device for data collection, the following API can be used.

#### Concrete Example

{% tabs %}
{% tab title="Swift" %}

```swift
let service = DeviceService()
service.deactivate(then: { result in
    switch result {
    case: .success(_)
        // deactivation successful
    case: .failure(_)
        // failure error
    }
})
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
val service = DeviceService()
service.deactivate() { result: Result<Content?>? ->
    if (result?.value == null || result.throwable != null) {
        // failure
    } else {
        // Success
        val content = result.value
    }
})
```

{% endtab %}
{% endtabs %}

## Fetch

In order to fetch the current`Device`'s model, the following API can be used.

#### Concrete Example

{% tabs %}
{% tab title="Swift" %}

```swift
let service = DeviceService()
service.fetch(then: { result in
    guard !result.value.isEmpty else {
        // error
        return
    }
    completionHandler(.success(result.value))
})
```

{% endtab %}
{% endtabs %}

## Verify And Re-Activate Device

To verify whether the current device is activated or to reactivate it if needed, please refer to the example below.

#### Example

{% tabs %}
{% tab title="Swift" %}

```swift
let service = DeviceService()
deviceService.fetch { result in
    switch result {
    case .success:
        guard let device = result.value else {
            // DEVICE DOES NOT EXIST -> IS NOT ACTIVATED -> Re-ACTIVATE
            deviceService.activate(then: { result in
                switch result {
                case: .success(_)
                    // activation successful
                case: .failure(_)
                    // failure error
                }
            })
            return
        }
        guard device.isDataCollectionEnabled ?? false else {
            // DEVICE IS PRESENT -> BUT NOT ACTIVATED -> Re-ACTIVATE
            deviceService.activate(then: { result in
                switch result {
                case: .success(_)
                    // activation successful
                case: .failure(_)
                    // failure error
                }
            })
            return
        }
        // DEVICE IS ACTIVATED
        completionHandler(.success(device))
    case .failure(let error):
        // HANDLE FAILURE
    }
}
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
DeviceService().fetch { result ->
    val device = result.value
    if (result.throwable == null && device != null) {
        if(device.dataCollectionIsActive) {
            // DEVICE IS ACTIVATED
        } else {
            // DEVICE IS PRESENT -> BUT NOT ACTIVATED -> Re-ACTIVATE
            DeviceService().activate() { result: Result<Content?>? ->
                if (result?.value == null || result.throwable != null) {
                    // failure
                } else {
                    // Success
                    val content = result.value
                }
            })
        }
    } else {
        // DEVICE DOES NOT EXIST -> IS NOT ACTIVATED -> Re-ACTIVATE
        DeviceService().activate() { result: Result<Content?>? ->
            if (result?.value == null || result.throwable != null) {
                // failure
            } else {
                // Success
                val content = result.value
            }
        })
    }
}
```

{% endtab %}
{% endtabs %}


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