{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/apv022/mcf-spec/master/schemas/1.1/question.schema.json",
  "title": "MCF 1.1 question",
  "oneOf": [
    {
      "$ref": "#/$defs/multipleChoice"
    },
    {
      "$ref": "#/$defs/multipleSelect"
    },
    {
      "$ref": "#/$defs/trueFalse"
    },
    {
      "$ref": "#/$defs/numeric"
    },
    {
      "$ref": "#/$defs/shortAnswer"
    },
    {
      "$ref": "#/$defs/essay"
    },
    {
      "$ref": "#/$defs/openResponse"
    },
    {
      "$ref": "#/$defs/matching"
    },
    {
      "$ref": "#/$defs/ordering"
    }
  ],
  "$defs": {
    "common": {
      "type": "object",
      "required": [
        "id",
        "type",
        "prompt"
      ],
      "properties": {
        "id": {
          "$ref": "common.schema.json#/$defs/id"
        },
        "type": {
          "enum": [
            "multiple_choice",
            "multiple_select",
            "true_false",
            "numeric",
            "short_answer",
            "essay",
            "open_response",
            "matching",
            "ordering"
          ]
        },
        "prompt": {
          "$ref": "common.schema.json#/$defs/nonEmptyString"
        },
        "hint": {
          "type": "string"
        },
        "explanation": {
          "type": "string"
        },
        "points": {
          "type": "number",
          "minimum": 0,
          "default": 1
        },
        "required": {
          "type": "boolean",
          "default": true
        },
        "evaluation": {
          "enum": [
            "automatic",
            "manual",
            "completion",
            "ungraded"
          ]
        },
        "learning_outcomes": {
          "type": "array",
          "minItems": 1,
          "uniqueItems": true,
          "items": {
            "$ref": "common.schema.json#/$defs/id"
          }
        },
        "extensions": {
          "$ref": "common.schema.json#/$defs/extensions"
        }
      }
    },
    "option": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "id",
        "text"
      ],
      "properties": {
        "id": {
          "$ref": "common.schema.json#/$defs/id"
        },
        "text": {
          "$ref": "common.schema.json#/$defs/nonEmptyString"
        },
        "feedback": {
          "type": "string"
        },
        "weight": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        }
      }
    },
    "choiceFields": {
      "type": "object",
      "required": [
        "options",
        "answer"
      ],
      "properties": {
        "options": {
          "type": "array",
          "minItems": 2,
          "items": {
            "$ref": "#/$defs/option"
          }
        }
      }
    },
    "multipleChoice": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "$ref": "#/$defs/choiceFields"
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "const": "multiple_choice"
            },
            "answer": {
              "$ref": "common.schema.json#/$defs/id"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "multipleSelect": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "$ref": "#/$defs/choiceFields"
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "const": "multiple_select"
            },
            "answer": {
              "type": "array",
              "minItems": 1,
              "uniqueItems": true,
              "items": {
                "$ref": "common.schema.json#/$defs/id"
              }
            },
            "options": {
              "type": "array",
              "minItems": 2,
              "items": {
                "allOf": [
                  {
                    "$ref": "#/$defs/option"
                  },
                  {
                    "not": {
                      "required": [
                        "weight"
                      ]
                    }
                  }
                ]
              }
            },
            "scoring": {
              "enum": [
                "exact",
                "partial"
              ],
              "default": "exact"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "trueFalse": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "type": "object",
          "required": [
            "answer"
          ],
          "properties": {
            "type": {
              "const": "true_false"
            },
            "answer": {
              "type": "boolean"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "tolerance": {
      "oneOf": [
        {
          "type": "number",
          "minimum": 0
        },
        {
          "type": "object",
          "additionalProperties": false,
          "minProperties": 1,
          "properties": {
            "absolute": {
              "type": "number",
              "minimum": 0
            },
            "relative": {
              "type": "number",
              "exclusiveMinimum": 0
            }
          }
        }
      ]
    },
    "numeric": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "type": "object",
          "required": [
            "answer"
          ],
          "properties": {
            "type": {
              "const": "numeric"
            },
            "answer": {
              "type": "number"
            },
            "unit": {
              "$ref": "common.schema.json#/$defs/nonEmptyString"
            },
            "tolerance": {
              "$ref": "#/$defs/tolerance"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "normalization": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "trim": {
          "type": "boolean",
          "default": true
        },
        "case_sensitive": {
          "type": "boolean",
          "default": false
        },
        "collapse_whitespace": {
          "type": "boolean",
          "default": false
        },
        "unicode": {
          "enum": [
            "NFC",
            "NFD",
            "NFKC",
            "NFKD",
            "none"
          ],
          "default": "NFC"
        }
      }
    },
    "shortAnswer": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "type": "object",
          "oneOf": [
            {
              "required": [
                "answer"
              ]
            },
            {
              "required": [
                "answers"
              ]
            }
          ],
          "properties": {
            "type": {
              "const": "short_answer"
            },
            "answer": {
              "$ref": "common.schema.json#/$defs/nonEmptyString"
            },
            "answers": {
              "type": "array",
              "minItems": 1,
              "uniqueItems": true,
              "items": {
                "$ref": "common.schema.json#/$defs/nonEmptyString"
              }
            },
            "normalization": {
              "$ref": "#/$defs/normalization"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "completionFields": {
      "type": "object",
      "properties": {
        "minimum_words": {
          "type": "integer",
          "minimum": 1
        },
        "minimum_sentences": {
          "type": "integer",
          "minimum": 1
        },
        "keywords": {
          "type": "array",
          "minItems": 1,
          "uniqueItems": true,
          "items": {
            "$ref": "common.schema.json#/$defs/nonEmptyString"
          }
        },
        "minimum_keywords": {
          "type": "integer",
          "minimum": 1
        }
      },
      "dependentRequired": {
        "minimum_keywords": [
          "keywords"
        ]
      }
    },
    "essay": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "$ref": "#/$defs/completionFields"
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "const": "essay"
            },
            "rubric": {
              "$ref": "common.schema.json#/$defs/id"
            },
            "evaluation": {
              "enum": [
                "manual",
                "completion"
              ]
            }
          }
        },
        {
          "if": {
            "required": [
              "rubric"
            ]
          },
          "then": {
            "properties": {
              "evaluation": {
                "const": "manual"
              }
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "openResponse": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "$ref": "#/$defs/completionFields"
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "const": "open_response"
            },
            "evaluation": {
              "enum": [
                "completion",
                "ungraded"
              ]
            }
          }
        },
        {
          "if": {
            "anyOf": [
              {
                "required": [
                  "minimum_words"
                ]
              },
              {
                "required": [
                  "minimum_sentences"
                ]
              },
              {
                "required": [
                  "keywords"
                ]
              },
              {
                "required": [
                  "minimum_keywords"
                ]
              }
            ]
          },
          "then": {
            "properties": {
              "evaluation": {
                "const": "completion"
              }
            }
          },
          "else": {
            "properties": {
              "evaluation": {
                "const": "ungraded"
              }
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "textItem": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "id",
        "text"
      ],
      "properties": {
        "id": {
          "$ref": "common.schema.json#/$defs/id"
        },
        "text": {
          "$ref": "common.schema.json#/$defs/nonEmptyString"
        },
        "feedback": {
          "type": "string"
        }
      }
    },
    "matching": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "type": "object",
          "required": [
            "premises",
            "responses",
            "answer"
          ],
          "properties": {
            "type": {
              "const": "matching"
            },
            "premises": {
              "type": "array",
              "minItems": 2,
              "items": {
                "$ref": "#/$defs/textItem"
              }
            },
            "responses": {
              "type": "array",
              "minItems": 2,
              "items": {
                "$ref": "#/$defs/textItem"
              }
            },
            "answer": {
              "type": "object",
              "minProperties": 2,
              "additionalProperties": {
                "$ref": "common.schema.json#/$defs/id"
              }
            },
            "reuse_responses": {
              "type": "boolean",
              "default": false
            },
            "scoring": {
              "enum": [
                "exact",
                "partial"
              ],
              "default": "exact"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    },
    "ordering": {
      "allOf": [
        {
          "$ref": "#/$defs/common"
        },
        {
          "type": "object",
          "required": [
            "items",
            "answer"
          ],
          "properties": {
            "type": {
              "const": "ordering"
            },
            "items": {
              "type": "array",
              "minItems": 2,
              "items": {
                "$ref": "#/$defs/textItem"
              }
            },
            "answer": {
              "type": "array",
              "minItems": 2,
              "uniqueItems": true,
              "items": {
                "$ref": "common.schema.json#/$defs/id"
              }
            },
            "scoring": {
              "enum": [
                "exact",
                "partial"
              ],
              "default": "exact"
            },
            "evaluation": {
              "const": "automatic"
            }
          }
        }
      ],
      "unevaluatedProperties": false
    }
  }
}