{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "https://yarunoka.dev/schema/1.1/schedule.schema.json",
    "title": "Yrnk schedule",
    "description": "A single schedule: a pure expression that describes a set of points in time. Fields are the annotations (label, description — inert human-facing text, never part of evaluation), the date axes (years, months, days), the date modifiers (shift, if), the time part (exactly one of times, allday, or every), and the validity range (from, until). A schedule refers to calendar vocabulary and date sets by name only; it carries no definitions of its own. This value carries rules JSON Schema cannot express; consult the specification.",
    "type": "object",
    "additionalProperties": false,
    "properties": {
        "label": {"$ref": "primitives.schema.json#/$defs/label"},
        "description": {"$ref": "primitives.schema.json#/$defs/description"},
        "from": {"$ref": "#/$defs/dateTime"},
        "until": {"$ref": "#/$defs/dateTime"},
        "years": {
            "type": "array",
            "minItems": 1,
            "uniqueItems": true,
            "items": {"type": "integer", "minimum": 1, "maximum": 9999}
        },
        "months": {
            "type": "array",
            "minItems": 1,
            "uniqueItems": true,
            "items": {"type": "integer", "minimum": 1, "maximum": 12}
        },
        "days": {
            "type": "array",
            "minItems": 1,
            "uniqueItems": true,
            "items": {"oneOf": [
                {"$ref": "#/$defs/dayAtom"},
                {"$ref": "#/$defs/dayCycle"}
            ]}
        },
        "shift": {"$ref": "#/$defs/shift"},
        "if": {"$ref": "#/$defs/ifGuard"},
        "times": {"$ref": "#/$defs/times"},
        "allday": {"const": true},
        "every": {"$ref": "#/$defs/sequenceEvery"}
    },
    "oneOf": [
        {
            "required": ["times"],
            "not": {"anyOf": [{"required": ["allday"]}, {"required": ["every"]}]}
        },
        {
            "required": ["allday"],
            "not": {"anyOf": [{"required": ["times"]}, {"required": ["every"]}]}
        },
        {
            "required": ["every", "from"],
            "not": {"anyOf": [
                {"required": ["times"]}, {"required": ["allday"]},
                {"required": ["years"]}, {"required": ["months"]}, {"required": ["days"]},
                {"required": ["shift"]}, {"required": ["if"]}
            ]}
        }
    ],
    "if": {
        "properties": {"days": {"contains": {"$ref": "#/$defs/dayCycle"}}},
        "required": ["days"]
    },
    "then": {"required": ["from"]},
    "$defs": {
        "dateTime": {
            "description": "This value carries rules JSON Schema cannot express; consult the specification.",
            "type": "string",
            "minLength": 16,
            "maxLength": 16,
            "pattern": "^\\d{4}-\\d{2}-\\d{2} ([01]\\d|2[0-3]):[0-5]\\d$"
        },
        "dayCycle": {
            "type": "array",
            "prefixItems": [
                {"const": "every"},
                {"type": "integer", "minimum": 1, "maximum": 3652058},
                {"const": "day"}
            ],
            "minItems": 3,
            "maxItems": 3,
            "items": false
        },
        "sequenceEvery": {
            "oneOf": [
                {
                    "type": "array",
                    "prefixItems": [
                        {"type": "integer", "minimum": 1, "maximum": 87649415},
                        {"const": "hour"}
                    ],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [
                        {"type": "integer", "minimum": 1, "maximum": 5258964959},
                        {"const": "minute"}
                    ],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [
                        {"type": "integer", "minimum": 1, "maximum": 315537897599},
                        {"const": "second"}
                    ],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                }
            ]
        },

        "ordinal": {"enum": ["1st", "2nd", "3rd", "4th", "5th", "last"]},
        "ordinalTuple": {
            "type": "array",
            "prefixItems": [{"$ref": "#/$defs/ordinal"}, {"$ref": "primitives.schema.json#/$defs/dayName"}],
            "minItems": 2,
            "maxItems": 2,
            "items": false
        },
        "dayAtomWord": {
            "description": "This value carries rules JSON Schema cannot express; consult the specification.",
            "type": "string",
            "minLength": 1,
            "pattern": "\\S",
            "allOf": [
                {"not": {"enum": [
                    "business_hour",
                    "1st", "2nd", "3rd", "4th", "5th", "last",
                    "not", "prev", "next", "or_same",
                    "hour", "minute", "second", "day",
                    "version", "timezone", "resolvers", "calendar", "schedules",
                    "years", "months", "days", "shift", "if", "times", "allday", "every", "between", "from", "until",
                    "holidays", "business_holidays", "business_days", "workweek", "business_hours", "date_sets",
                    "label", "description"
                ]}},
                {"not": {"pattern": "^\\d+$"}},
                {"not": {"pattern": "^\\d{2}:\\d{2}$"}},
                {"not": {"pattern": "^\\d{4}-\\d{2}-\\d{2}$"}}
            ]
        },
        "dayAtom": {
            "oneOf": [
                {"type": "integer", "minimum": 1, "maximum": 31},
                {"$ref": "#/$defs/dayAtomWord"},
                {"$ref": "#/$defs/ordinalTuple"}
            ]
        },

        "direction": {"enum": ["prev", "next"]},
        "shift": {
            "oneOf": [
                {
                    "type": "array",
                    "prefixItems": [{"$ref": "#/$defs/direction"}, {"$ref": "#/$defs/dayAtom"}],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [{"$ref": "#/$defs/direction"}, {"const": "or_same"}, {"$ref": "#/$defs/dayAtom"}],
                    "minItems": 3,
                    "maxItems": 3,
                    "items": false
                }
            ]
        },

        "ifGuard": {
            "oneOf": [
                {
                    "type": "array",
                    "prefixItems": [{"$ref": "#/$defs/dayAtom"}],
                    "minItems": 1,
                    "maxItems": 1,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [{"const": "not"}, {"$ref": "#/$defs/dayAtom"}],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [{"$ref": "#/$defs/direction"}, {"$ref": "#/$defs/dayAtom"}],
                    "minItems": 2,
                    "maxItems": 2,
                    "items": false
                },
                {
                    "type": "array",
                    "prefixItems": [{"$ref": "#/$defs/direction"}, {"const": "not"}, {"$ref": "#/$defs/dayAtom"}],
                    "minItems": 3,
                    "maxItems": 3,
                    "items": false
                }
            ]
        },

        "times": {
            "oneOf": [
                {"type": "array", "minItems": 1, "uniqueItems": true, "items": {"$ref": "primitives.schema.json#/$defs/time"}},
                {
                    "type": "object",
                    "additionalProperties": false,
                    "required": ["every"],
                    "properties": {
                        "every": {
                            "oneOf": [
                                {
                                    "type": "array",
                                    "prefixItems": [
                                        {"type": "integer", "minimum": 1, "maximum": 24},
                                        {"const": "hour"}
                                    ],
                                    "minItems": 2,
                                    "maxItems": 2,
                                    "items": false
                                },
                                {
                                    "type": "array",
                                    "prefixItems": [
                                        {"type": "integer", "minimum": 1, "maximum": 1440},
                                        {"const": "minute"}
                                    ],
                                    "minItems": 2,
                                    "maxItems": 2,
                                    "items": false
                                },
                                {
                                    "type": "array",
                                    "prefixItems": [
                                        {"type": "integer", "minimum": 1, "maximum": 86400},
                                        {"const": "second"}
                                    ],
                                    "minItems": 2,
                                    "maxItems": 2,
                                    "items": false
                                }
                            ]
                        },
                        "between": {
                            "oneOf": [
                                {"$ref": "primitives.schema.json#/$defs/window"},
                                {"const": "business_hour"}
                            ]
                        }
                    }
                }
            ]
        }
    }
}