{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "properties": {
        "$schema": {
            "type": "string",
            "description": "URL to a schema file"
        },
        "apiVersion": {
            "description": "API Version",
            "type": "integer"
        },
        "version": {
            "type": "object",
            "description": "Version of the asset.",
            "properties": {
                "full": {
                    "type": "string",
                    "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+$"
                },
                "major": {
                    "type": "number",
                    "minimum": 0
                },
                "minor": {
                    "type": "number",
                    "minimum": 0
                },
                "revision": {
                    "type": "number",
                    "minimum": 0
                },
                "build": {
                    "type": "number",
                    "minimum": 0
                }
            },
            "additionalProperties": false,
            "required": ["full", "major", "minor", "revision", "build"]
        },
        "dependencyFiles": {
            "type": "array",
            "description": "All files which will be included in the HTML file of the HMI.",
            "items": {
                "type": "object",
                "properties": {
                    "name": {
                        "type": "string",
                        "pattern": "^(?!(/)).*$",
                        "description": "Path to the file with the function directory as base path.",
                        "minLength": 1
                    },
                    "type": {
                        "type": "string",
                        "enum": ["Stylesheet", "JavaScript", "EsModule"],
                        "description": "Type of the function asset. Stylesheet, JavaScript and EsModule are supported."
                    },
                    "description": {
                        "type": "string",
                        "description": "A long description of this file."
                    }
                },
                "additionalProperties": false,
                "required": ["name", "type", "description"]
            }
        },
        "function": {
            "type": "object",
            "description": "Description for the function itself.",
            "properties": {
                "name": {
                    "type": "string",
                    "minLength": 1,
                    "description": "The name of the function."
                },
                "namespace": {
                    "type": "string",
                    "description": "The namespace of the function."
                },
                "displayName": {
                    "type": "string",
                    "description": "Name which should be presented the user."
                },
                "visible": {
                    "type": "boolean",
                    "description": "Determine if a function is shown to the user."
                },
                "description": {
                    "type": "string",
                    "description": "A long description of this function."
                },
                "category": {
                    "type": "string",
                    "default": "Other",
                    "description": "Name of the area this function will be listed in the creator."
                },
                "injectContextObject": {
                    "type": "boolean",
                    "description": "Adds a context object to the function as the first parameter."
                },
                "waitMode": {
                    "type": "string",
                    "default": "Synchronous",
                    "enum": ["Synchronous", "Asynchronous"],
                    "description": "Tells the system if the function is finished synchronous or if the user will call a feedback function in the context object of the context object to signal finish."
                },
                "returnValue": {
                    "description": "Return value type as a tchmi reference name or null if the function has no return value.",
                    "anyOf": [
                        {
                            "description": "Return value type as a tchmi reference name.",
                            "type": "object",
                            "properties": {
                                "type": {
                                    "type": "string",
                                    "pattern": "^tchmi:",
                                    "description": "Type from the return value."
                                },
                                "description": {
                                    "type": "string",
                                    "description": "A long description of the return value."
                                }
                            },
                            "additionalProperties": false
                        },
                        {
                            "description": "The function has no return value.",
                            "type": "null"
                        }
                    ]
                },
                "arguments": {
                    "type": "array",
                    "description": "Function arguments.",
                    "items": {
                        "type": "object",
                        "properties": {
                            "name": {
                                "type": "string",
                                "minLength": 1,
                                "description": "Variable name in the function."
                            },
                            "displayName": {
                                "type": "string",
                                "description": "Name which should be presented the user."
                            },
                            "type": {
                                "type": "string",
                                "minLength": 6,
                                "pattern": "^tchmi:",
                                "description": "Information about the expected type as a tchmi reference name."
                            },
                            "description": {
                                "type": "string",
                                "description": "A long description of this argument."
                            },
                            "required": {
                                "type": "boolean",
                                "description": "This parameter is mandatory for this function."
                            },
                            "bindable": {
                                "type": "boolean",
                                "description": "This parameter can be binded to a symbol."
                            },
                            "allowControlAttributeBindingOptions": {
                                "type": "boolean",
                                "description": "This parameter can have the same binding options as a control attribute."
                            },
                            "allowSymbolReferenceWatchDelegation": {
                                "type": "boolean",
                                "description": "Determines if symbol references injected via this parameter will be watched by the function itself if 'delegatedWatch: true' is defined in the context object when calling the function."
                            },
                            "asReference": {
                                "type": "boolean",
                                "description": "TcHmiCreator ui state. Do not manipulate."
                            },
                            "defaultValue": {
                                "description": "This value will be used as initial value while function is generated in engineering."
                            },
                            "restParameter": {
                                "type": "boolean",
                                "description": "Specified the argument as rest parameter (variable number of arguments)."
                            },
                            "refTo": {
                                "type": "string",
                                "description": "The name of an arguments which contains information relevant for this parameter.\nThe engineering will use this information to optimize data selection based on the underlying types.\nExample: Argument which contains the name of a control properrty may refer to an argument which holds a control reference."
                            }
                        },
                        "additionalProperties": false,
                        "required": ["name", "displayName", "description", "type", "required", "bindable"]
                    }
                }
            },
            "additionalProperties": false,
            "required": ["name", "displayName", "namespace", "description", "arguments", "returnValue"]
        },
        "dataTypes": {
            "type": "array",
            "description": "List of custom data types.",
            "items": {
                "type": "object",
                "properties": {
                    "schema": {
                        "type": "string",
                        "minLength": 1,
                        "pattern": "^(?!(/)).*$",
                        "description": "Path to the schema describing the datatype."
                    }
                },
                "additionalProperties": false,
                "required": ["schema"]
            }
        },
        "languages": {
            "type": "object",
            "description": "List of language files delivered by the function.",
            "additionalProperties": {
                "description": "Key is the language and region (optionally) as described in ISO 639/BCP 47 (Examples: 'en', 'en-US'). Value is the file path or array of paths.",
                "oneOf": [
                    {
                        "type": "string",
                        "description": "Key is the language and region (optionally) as described in ISO 639/BCP 47 (Examples: 'en', 'en-US'). Value is the file path."
                    },
                    {
                        "type": "array",
                        "items": {
                            "type": "string",
                            "description": "List of localization files. If some keys are referenced in multiple files, the last file will win."
                        }
                    }
                ]
            }
        }
    },
    "required": ["function"],
    "additionalProperties": false
}