{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Messages that Broker Sends over WebSocket",
  "type": "object",
  "anyOf": [
    { "$ref": "#/definitions/AckMessage" },
    { "$ref": "#/definitions/DataMessage" },
    { "$ref": "#/definitions/ErrorMessage" }
  ],
  "definitions": {
    "AckMessage": {
      "properties": {
        "type": {
          "const": "ack"
        },
        "endpoint": {
          "type": "string"
        },
        "version": {
          "type": "string"
        }
      },
      "required": ["type", "endpoint", "version"]
    },
    "DataMessage": {
      "$ref": "#/definitions/Data",
      "properties": {
        "type": {
          "const": "data-message"
        },
        "topic": {
          "type": "string"
        }
      },
      "required": ["type", "topic"]
    },
    "ErrorMessage": {
      "properties": {
        "type": {
          "const": "error"
        },
        "code": {
          "type": "string"
        },
        "context": {
          "type": "string"
        }
      },
      "required": ["type", "code", "context"]
    },
    "Data": {
      "anyOf": [
        { "$ref": "#/definitions/None" },
        { "$ref": "#/definitions/Boolean" },
        { "$ref": "#/definitions/Count" },
        { "$ref": "#/definitions/Integer" },
        { "$ref": "#/definitions/Real" },
        { "$ref": "#/definitions/Timespan" },
        { "$ref": "#/definitions/Timestamp" },
        { "$ref": "#/definitions/String" },
        { "$ref": "#/definitions/EnumValue" },
        { "$ref": "#/definitions/Address" },
        { "$ref": "#/definitions/Subnet" },
        { "$ref": "#/definitions/Port" },
        { "$ref": "#/definitions/Vector" },
        { "$ref": "#/definitions/Set" },
        { "$ref": "#/definitions/Table" }
      ]
    },
    "None": {
      "properties": {
        "@data-type": {
          "const": "none"
        },
        "data": { }
      },
      "required": ["@data-type", "data"]
    },
    "Boolean": {
      "properties": {
        "@data-type": {
          "const": "boolean"
        },
        "data": {
          "type": "boolean"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Count": {
      "properties": {
        "@data-type": {
          "const": "count"
        },
        "data": {
          "type": "integer",
          "minimum" : 0
        }
      },
      "required": ["@data-type", "data"]
    },
    "Integer": {
      "properties": {
        "@data-type": {
          "const": "integer"
        },
        "data": {
          "type": "integer"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Real": {
      "properties": {
        "@data-type": {
          "const": "real"
        },
        "data": {
          "type": "number"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Timespan": {
      "properties": {
        "@data-type": {
          "const": "timespan"
        },
        "data": {
          "type": "string",
          "pattern": "^[0-9]+(ns|ms|s|min|h|d)$"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Timestamp": {
      "properties": {
        "@data-type": {
          "const": "timestamp"
        },
        "data": {
          "type": "string",
          "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?$"
        }
      },
      "required": ["@data-type", "data"]
    },
    "String": {
      "properties": {
        "@data-type": {
          "const": "string"
        },
        "data": {
          "type": "string"
        }
      },
      "required": ["@data-type", "data"]
    },
    "EnumValue": {
      "properties": {
        "@data-type": {
          "const": "enum-value"
        },
        "data": {
          "type": "string"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Address": {
      "properties": {
        "@data-type": {
          "const": "address"
        },
        "data": {
          "type": "string",
          "pattern": "^([0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+)|([0-9a-fA-F:.]+)?$"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Subnet": {
      "properties": {
        "@data-type": {
          "const": "subnet"
        },
        "data": {
          "type": "string",
          "pattern": "^([0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+)|([0-9a-fA-F:.]+)?/[0-9]+$"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Port": {
      "properties": {
        "@data-type": {
          "const": "port"
        },
        "data": {
          "type": "string",
          "pattern": "^[0-9]+/(tcp|udp|icmp|\\?)?$"
        }
      },
      "required": ["@data-type", "data"]
    },
    "Vector": {
      "properties": {
        "@data-type": {
          "const": "vector"
        },
        "data": {
          "type": "array",
          "items": { "$ref": "#/definitions/Data" }
        }
      },
      "required": ["@data-type", "data"]
    },
    "Set": {
      "properties": {
        "@data-type": {
          "const": "set"
        },
        "data": {
          "type": "array",
          "uniqueItems": true,
          "items": { "$ref": "#/definitions/Data" }
        }
      },
      "required": ["@data-type", "data"]
    },
    "KeyValuePair": {
      "properties": {
        "key": { "$ref": "#/definitions/Data" },
        "value": { "$ref": "#/definitions/Data" }
      },
      "required": ["key", "value"]
    },
    "Table": {
      "properties": {
        "@data-type": {
          "const": "table"
        },
        "data": {
          "type": "array",
          "items": { "$ref": "#/definitions/KeyValuePair" }
        }
      },
      "required": ["@data-type", "data"]
    }
  }
}