"""
(IoT / Edge - ) Devices are hosts having a state containing the "output" / the business data which is exposed
besides monitoring information.
"""
interface Device implements Host {
    """Internal Zabbix ID of the device."""
    hostid: ID!
    """
    Per convention a uuid is used as hostname to identify devices if they do not have a unique hostname.
    """
    host: String!
    """Classification of the device."""
    deviceType: String
    """List of host groups this device belongs to."""
    hostgroups: [HostGroup!]
    """Visible name of the device."""
    name: String
    """Device configuration tags."""
    tags: DeviceConfig
    """State of the device."""
    state: DeviceState
}

"""
Configuration settings for a device.
"""
type DeviceConfig {
    """
    Configuration for the device widget preview in the cockpit.
    """
    deviceWidgetPreview: WidgetPreview
}

"""
Represents the configuration for a 4-field widget preview.
"""
type WidgetPreview {
    """Top-left field specification."""
    TOP_LEFT: DisplayFieldSpec
    """Top-right field specification."""
    TOP_RIGHT: DisplayFieldSpec
    """Bottom-left field specification."""
    BOTTOM_LEFT: DisplayFieldSpec
    """Bottom-right field specification."""
    BOTTOM_RIGHT: DisplayFieldSpec
}

"""
Specification for a display field in a widget.
"""
type DisplayFieldSpec {
    """Key of the data to display."""
    key: String,
    """Value to display if the data is missing."""
    emptyValue: String
    """Unit string to append to the value."""
    unit: String,
    """Font size for the value."""
    value_font_size: String
    """Optional transformation for the value."""
    g_value_transform: String
    """Font size for the unit."""
    unit_font_size: String
    """Optional transformation for the unit."""
    g_unit_transform: String
}

"""
Operational data common to most devices.
"""
type OperationalDeviceData {
    """Device temperature."""
    temperature: Float
    """Device voltage."""
    voltage: Float
    """Signal strength (e.g. WiFi or GSM)."""
    signalstrength: Float
    """Current location of the device."""
    location: Location
    """Timestamp of the operational data."""
    timestamp: DateTime
    """List of active errors or status messages."""
    error: [ErrorPayload!]
}

"""
Payload for a single error or status message.
"""
type ErrorPayload {
    """Error code."""
    code: Int!
    """Human-readable error message."""
    message: String
    """Additional contextual information about the error."""
    additionalInfo: JSONObject
}

"""
Common interface for device state.
"""
interface DeviceState {
    """Operational data (telemetry)."""
    operational: OperationalDeviceData
}

"""
Generic implementation of device state using a JSON object for current values.
"""
type GenericDeviceState implements DeviceState {
    """Operational data (telemetry)."""
    operational: OperationalDeviceData
    """Current business data as a generic JSON object."""
    current: JSONObject
}


"""
Device represents generic IoT / Edge - devices providing their state as generic "state.current" - JSON Object.
"""
type GenericDevice implements Host & Device  {
    """Internal Zabbix ID of the device."""
    hostid: ID!
    """
    Per convention a uuid is used as hostname to identify devices if they do not have a unique hostname.
    """
    host: String!
    """Classification of the device."""
    deviceType: String
    """List of host groups this device belongs to."""
    hostgroups: [HostGroup!]
    """Visible name of the device."""
    name: String
    """Device configuration tags."""
    tags: DeviceConfig
    """State of the generic device."""
    state: GenericDeviceState
}