{
    "$id": "https://schema.owlboard.info/data-ingress/darwin/ref/via-text.schema.json",
    "$schema": "https://json-schema.org/draft-07/schema#",
    "title": "DarwinViaText",
    "type": "object",
    "properties": {
        "service_name": {
            "type": "string",
            "description": "Name of the service submitting the update"
        },
        "service_id": {
            "type": "string",
            "description": "ID of the service sending the message - usually a hostname"
        },
        "data_type": {
            "type": "string",
            "const": "raw",
            "description": "The type of data contained in this message object"
        },
        "sent_timestamp": {
            "type": "integer",
            "description": "Unix timestamp representing the time the message was sent"
        },
        "data_kind": {
            "type": "string",
            "const": "ref-darwin-via-text",
            "description": "The data type contained in the message.  Currently supported PIS: PIS Data, Timetable: CIF or VSTP Data, Knowledgebase: Station Data"
        },
        "payload": {
            "type": "array",
            "additionalItems": false,
            "items": {
                "type": "object",
                "required": ["a", "d", "l1", "v"],
                "properties": {
                    "a": {
                        "name": "at",
                        "type": "string",
                        "description": "The CRS defining where the text should be displayed"
                    },
                    "d": {
                        "name": "destination",
                        "type": "string",
                        "description": "The text should apply to trains to this destination"
                    },
                    "l1": {
                        "name": "location-one",
                        "type": "string",
                        "description": "Message triggered if loc1 & loc2 (if present) are listed as stops"
                    },
                    "l2": {
                        "name": "location-two",
                        "type": "string",
                        "description": "Message triggered if loc1 & loc2 (if present) are listed as stops"
                    },
                    "v": {
                        "name": "viaText",
                        "description": "The text that should be displayed",
                        "type": "string"
                    }
                }
            }
        }
    },
    "required": ["service_name", "service_id", "data_type", "data_kind", "sent_timestamp"],
    "additionalProperties": false
}