{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://cdn.jsdelivr.net/npm/@pie-element/number-line@14.0.6/dist/schemas/session.schema.json",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Identifier of the session"
    },
    "element": {
      "type": "string",
      "description": "The element the session belongs to"
    },
    "answer": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/NumberLineResponse"
      },
      "description": "The objects the student plotted"
    }
  },
  "definitions": {
    "NumberLineResponse": {
      "anyOf": [
        {
          "$ref": "#/definitions/NumberLinePoint"
        },
        {
          "$ref": "#/definitions/NumberLineLine"
        },
        {
          "$ref": "#/definitions/NumberLineRay"
        }
      ],
      "description": "An object plotted on the number line"
    },
    "NumberLinePoint": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "const": "point",
          "description": "Indicates the response type"
        },
        "domainPosition": {
          "type": "number",
          "description": "Indicates response domain position"
        },
        "pointType": {
          "$ref": "#/definitions/NumberLinePointType",
          "description": "Indicates point type"
        }
      },
      "required": [
        "type",
        "domainPosition",
        "pointType"
      ],
      "description": "A point at `domainPosition`"
    },
    "NumberLinePointType": {
      "type": "string",
      "enum": [
        "full",
        "empty"
      ],
      "description": "Whether a point is drawn filled (included) or hollow (excluded)"
    },
    "NumberLineLine": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "const": "line",
          "description": "Indicates the response type"
        },
        "domainPosition": {
          "type": "number",
          "description": "Indicates response domain position: the left end of the line"
        },
        "size": {
          "type": "number",
          "description": "Indicates line size"
        },
        "leftPoint": {
          "$ref": "#/definitions/NumberLinePointType",
          "description": "Indicates left point (left limit for the line) type"
        },
        "rightPoint": {
          "$ref": "#/definitions/NumberLinePointType",
          "description": "Indicates right point (right limit for the line) type"
        }
      },
      "required": [
        "type",
        "domainPosition",
        "size",
        "leftPoint",
        "rightPoint"
      ],
      "description": "A segment from `domainPosition` to `domainPosition + size`"
    },
    "NumberLineRay": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "const": "ray",
          "description": "Indicates the response type"
        },
        "domainPosition": {
          "type": "number",
          "description": "Indicates response domain position"
        },
        "pointType": {
          "$ref": "#/definitions/NumberLinePointType",
          "description": "Indicates point type"
        },
        "direction": {
          "type": "string",
          "enum": [
            "negative",
            "positive"
          ],
          "description": "Indicates ray direction"
        }
      },
      "required": [
        "type",
        "domainPosition",
        "pointType",
        "direction"
      ],
      "description": "A ray starting at `domainPosition`"
    }
  }
}