{
  "id": "http://example.com/schema",
  "type": "object",
  "required": [ "name", "description", "author", "size", "table", "words", "solution", "level" ],
  "additionalProperties": false,
  "properties": {
    "name": {
      "type": "string",
      "minLength": 4,
      "maxLength": 190
    },
    "description": {
      "type": "string"
    },
    "author": {
      "type": "string"
    },
    "size": {
      "required": [ "width", "height" ],
      "additionalProperties": false,
      "properties": {
        "width": {
          "type": "number",
          "multipleOf": 1,
          "minimum": 2
        },
        "height": {
          "type": "number",
          "multipleOf": 1,
          "minimum": 2
        }
      }
    },
    "table": {
      "type": "array",
      "minItems": 2,
      "additionalItems": false,
      "items": {
        "type": "array",
        "minItems": 2,
        "additionalItems": false,
        "items": {
          "$ref": "#/definitions/word"
        }
      }
    },
    "words": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "required": [ "ID", "color", "start", "stop", "fields", "direction" ],
        "additionalProperties": false,
        "properties": {
          "ID": {
            "type": "number",
            "multipleOf": 1,
            "minimum": 0
          },
          "color": {
            "type": "string",
            "enum": [ "black", "red", "green", "blue", "orange", "violet", "aqua" ]
          },
          "start": {
            "$ref": "#/definitions/position"
          },
          "stop": {
            "$ref": "#/definitions/position"
          },
          "fields": {
            "type": "array",
            "minItems": 2,
            "items": {
              "type": "object",
              "required": [ "x", "y", "word" ],
              "additionalProperties": false,
              "properties": {
                "x": {
                  "type": "number",
                  "multipleOf": 1,
                  "minimum": 0
                },
                "y": {
                  "type": "number",
                  "multipleOf": 1,
                  "minimum": 0
                },
                "word": {
                  "$ref": "#/definitions/word"
                }
              }
            }
          },
          "direction": {
            "type": "string",
            "enum": [ "down-right", "up-left", "up-right", "down-left", "down", "up", "left", "right" ]
          }
        }
      }
    },
    "solution": {
      "type": "object",
      "maxProperties": 0
    },
    "level": {
      "type": "number",
      "multipleOf": 1,
      "minimum": 0,
      "maximum": 3
    }
  },
  "definitions": {
    "position": {
      "required": [ "x", "y" ],
      "additionalProperties": false,
      "properties": {
        "x": {
          "type": "number",
          "multipleOf": 1
        },
        "y": {
          "type": "number",
          "multipleOf": 1
        }
      }
    },
    "word": {
      "type": "object",
      "required": [ "letter" ],
      "additionalProperties": false,
      "properties": {
        "letter": {
              "type": [ "string", "null" ],
              "minLength": 1,
              "maxLength": 1,
              "pattern": "[a-zA-Z]"
        }
      }
    }
  }
}