{
  "$id": "https://gdal.org/gdal_algorithm.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Validate the output of the 'gdal [command] [subcommand] --json-usage'",

  "oneOf": [
    {
      "$ref": "#/definitions/algorithm"
    }
  ],

  "definitions": {

    "algorithm": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "$comment": "Algorithm name. Normally always set, except for the top 'gdal' algorithm"
        },
        "full_path": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "$comment": "Full path to get to this algorithm. For example, for 'gdal raster info', this will be [\"gdal\", \"raster\", \"info\"]"
        },
        "description": {
          "type": "string",
          "$comment": "One sentence description of the algorithm"
        },
        "short_url": {
          "type": "string",
          "$comment": "URL to the help page, without the server. For example \"/programs/gdal_raster_info.html\""
        },
        "url": {
          "type": "string",
          "$comment": "Full URL to the help page. For example \"https://gdal.org/programs/gdal_raster_info.html\""
        },
        "sub_algorithms": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/algorithm"
          },
          "$comment": "Names of the immediate sub-algorithm of this algorithm. For example, or 'gdal raster', this will be [\"info\", \"convert\", ...]"
        },
        "input_arguments": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/argument"
          },
          "$comment": "Input arguments of the algorithm"
        },
        "output_arguments": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/argument"
          },
          "$comment": "Output arguments of the algorithm, that is arguments that are set by the algorithm (typically an output dataset)"
        },
        "input_output_arguments": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/argument"
          },
          "$comment": "Arguments of the algorithm that are both read and written by it."
        },
        "pipeline_algorithms": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/algorithm"
          },
          "$comment": "For pipeline algorithm, description of the accepted step algorithms. Only present for such pipeline algorithms"
        },
        "supports_streamed_output": {
          "type": "boolean",
          "$comment": "Whether the algorithm supports a streamed output dataset"
        }
      },
      "required": [
        "description",
        "sub_algorithms",
        "input_arguments",
        "output_arguments",
        "input_output_arguments"
      ],
      "additionalProperties": false
    },

    "argument": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "$comment": "Argument name"
        },
        "type": {
          "enum": [
            "boolean",
            "integer",
            "real",
            "string",
            "dataset",
            "integer_list",
            "real_list",
            "string_list",
            "dataset_list"
          ],
          "$comment": "Argument type"
        },
        "description": {
          "type": "string",
          "$comment": "Argument description"
        },
        "metavar": {
          "type": "string",
          "$comment": "Hint on the expected value of the argument"
        },
        "choices": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "$comment": "Valid values for the argument, when it accepts an enumeration as a value"
        },
        "default": {
          "$comment": "Default value (optional)"
        },
        "min_value": {
          "type": "number",
          "$comment": "Minimum value allowed"
        },
        "min_value_is_included": {
          "type": "boolean",
          "$comment": "Whether min_value is included"
        },
        "max_value": {
          "type": "number",
          "$comment": "Maximum value allowed"
        },
        "max_value_is_included": {
          "type": "boolean",
          "$comment": "Whether max_value is included"
        },
        "required": {
          "type": "boolean",
          "$comment": "Whether this argument is required"
        },
        "packed_values_allowed": {
          "type": "boolean",
          "$comment": "For command-line specification, for multi-valued arguments (type: integer_list, real_list, string_list), whether comma-separated values are accepted. e.g. '--my-arg=first,second'"
        },
        "repeated_arg_allowed": {
          "type": "boolean",
          "$comment": "For command-line specification, for multi-valued arguments (type: integer_list, real_list, string_list), whether several repetition of the argument are accepted. e.g. '--my-arg first --my-arg second'"
        },
        "min_count": {
          "type": "integer",
          "$comment": "For multi-valued arguments (type: integer_list, real_list, string_list, dataset_list), minimum number of values"
        },
        "max_count": {
          "type": "integer",
          "$comment": "For multi-valued arguments (type: integer_list, real_list, string_list, dataset_list), maximum number of values"
        },
        "category": {
          "type": "string",
          "$comment": "Category of the argument. Common categories include \"Base\", \"Advanced\", \"Esoteric\", but algorithms may define their own categories."
        },
        "mutual_exclusion_group": {
          "type": "string",
          "$comment": "Identifier shared by several arguments to mean they are mutually exclusive."
        },
        "metadata": {
          "type": "object",
          "$comment": "Object whose keys are metadata item names. This is typically used for type=dataset arguments. e.g. \"metadata\":{ \"required_capabilities\":[ \"DCAP_RASTER\", \"DCAP_CREATECOPY\" ] }"
        },
        "dataset_type": {
          "type": "array",
          "items": {
            "enum": [
              "raster",
              "vector",
              "multidim_raster"
            ]
          },
          "$comment": "Type of accepted datasets. Only used for type=dataset or type=dataset_list."
        },
        "input_flags": {
          "type": "array",
          "items": {
            "enum": [
              "name",
              "dataset"
            ]
          },
          "$comment": "Which fields of a dataset argument may be set, by the user, when the argument is dealt as an input dataset. Only used for type=dataset or type=dataset_list."
        },
        "output_flags": {
          "type": "array",
          "items": {
            "enum": [
              "name",
              "dataset"
            ]
          },
          "$comment": "Which fields of a dataset argument may be set, by the algorithm, when the argument is dealt as an output dataset. Only used for type=dataset or type=dataset_list."
        }
      },
      "required": [
        "name",
        "type",
        "description",
        "required",
        "category"
      ],
      "additionalProperties": false
    }

  }
}
