{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$ref": "#/definitions/Sheet",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "sheet": {
      "$ref": "#/definitions/Sheet"
    }
  },
  "definitions": {
    "Sheet": {
      "title": "Sheet",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "name": {
          "description": "The name of the sheet.",
          "type": "string"
        },
        "displayField": {
          "description": "The name of the field to use for displaying a reference to this sheet in a cell. Useful only for UI-based consumption.",
          "type": "string"
        },
        "fields": {
          "description": "The fields of the sheet. Sheets must specify all fields present in the EXH file for that sheet, meaning they all must have at least one field.",
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/Field"
          }
        },
        "comment": {
          "type": "string"
        }
      },
      "oneOf": [
        { "required": ["name", "fields"] }
      ]
    },
    "Field": {
      "description": "A field in a sheet. Describes one or more columns.",
      "title": "Field",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "name": {
          "description": "The name of the field.",
          "type": "string"
        },
        "type": {
          "description": "Defines the type of the field. Scalar should be assumed by default, and has no meaning. The only other type that affects parsing is array.",
          "type": "string",
          "enum": ["scalar", "link", "array", "icon", "modelId", "color"]
        },
        "count": {
          "description": "Only valid for array types. Defines the number of elements in the array.",
          "type": "integer"
        },
        "targets": {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "string"
          }
        },
        "condition": {
          "$ref": "#/definitions/Condition"
        },
        "fields": {
          "description": "Only valid for array types. Defines the fields of the array. Fields are not available on non-array types because grouping non-array types is meaningless. They should be defined at the top-level.",
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/Field"
          }
        },
        "comment": {
          "type": "string"
        }
      },
      "allOf": [
        {
          "description": "Arrays require a count.",
          "if": {
            "required": ["type"],
            "properties": {
              "type": {
                "const": "array"
              }
            }
          },
          "then": {
            "required": ["count"]
          },
          "else": {
            "not": {
              "required": ["count"]
            }
          }
        },
        {
          "description": "Fields with a fields list must be an array.",
          "if": {
              "required": ["fields"]
          },
          "then": {
              "required": ["type"],
              "properties": {
                  "type": {
                      "const": "array"
                  }
              }
          }
        },
        {
          "description": "Fields with a count must be an array.",
          "if": {
            "required": ["count"]
          },
          "then": {
            "required": ["type"],
            "properties": {
              "type": {
                "const": "array"
              }
            }
          }
        },
        {
          "description": "Fields can have only one of condition or targets.",
          "allOf": [
            {
              "description": "Fields with targets cannot have a condition.",
              "if": {
                "required": ["targets"]
              },
              "then": {
                "not": {
                  "required": ["condition"]
                }
              }
            },
            {
              "description": "Fields with a condition cannot have targets.",
              "if": {
                "required": ["condition"]
              },
              "then": {
                "not": {
                  "required": ["targets"]
                }
              }
            },
            {
              "description": "Arrays can have neither condition or targets.",
              "not": {
                "required": ["condition", "targets"]
              }
            }
          ]
        },
        {
          "description": "Fields with a link type must have a condition or targets.",
          "if": {
              "required": ["type"],
              "properties": {
              "type": {
                  "const": "link"
              }
              }
          },
          "then": {
            "oneOf": [
              {
                "required": ["condition"],
                "not": {
                  "required": ["targets"]
                }
              },
              {
                "required": ["targets"],
                "not": {
                  "required": ["condition"]
                }
              }
            ]
          }
        }
      ]
    },
    "Condition": {
      "title": "Condition",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "switch": {
          "type": "string"
        },
        "cases": {
          "type": "object",
          "additionalProperties": {
            "type": "array",
            "items": {
              "type": "string"
            }
          }
        }
      },
      "required": ["cases", "switch"]
    }
  }
}