{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.selection.schema.json",
  "title": "CultNet Typed Selection",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "schemas": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 },
      "minItems": 1,
      "description": "Absent means every schema. Present and empty is refused at the door (selection_invalid), never treated as \"every schema\": omit the field instead."
    },
    "keys": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 },
      "minItems": 1,
      "description": "Absent means every key. Present and empty is refused at the door (selection_invalid), never treated as \"every key\": omit the field instead."
    },
    "fields": {
      "type": "array",
      "items": { "$ref": "#/$defs/fieldPredicate" }
    },
    "cites": { "$ref": "#/$defs/citation" },
    "cited": { "$ref": "#/$defs/incoming" },
    "projection": {
      "type": "string",
      "enum": ["header", "document"],
      "default": "header"
    },
    "descending": { "type": "boolean", "default": false },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 200,
      "description": "Clamped to 1..=200 by the answering server, not refused outside that range: an absent value or one outside the bound is treated as the nearer bound (absent = 200)."
    },
    "cursor": { "type": "string" }
  },
  "$defs": {
    "recordRef": {
      "type": "object",
      "required": ["schemaId", "recordKey"],
      "additionalProperties": false,
      "properties": {
        "schemaId": { "type": "string", "minLength": 1 },
        "recordKey": { "type": "string", "minLength": 1 }
      }
    },
    "fieldPredicate": {
      "type": "object",
      "required": ["index", "op"],
      "additionalProperties": false,
      "properties": {
        "index": { "type": "string", "minLength": 1 },
        "op": { "type": "string", "enum": ["any_of", "lt", "le", "ge", "gt"] },
        "values": {
          "type": "array",
          "items": { "type": "string" },
          "minItems": 1
        },
        "number": {
          "type": "string",
          "description": "Q-J: a canonical decimal string, never a JSON number. Matches ^-?(0|[1-9][0-9]*)(\\.[0-9]*[1-9])?$ and is not \"-0\"; any other spelling is refused typed at the door (selection_invalid), never normalised.",
          "pattern": "^(?!-0$)-?(0|[1-9][0-9]*)(\\.[0-9]*[1-9])?$"
        }
      },
      "oneOf": [
        {
          "required": ["values"],
          "not": { "required": ["number"] },
          "properties": { "op": { "const": "any_of" } }
        },
        {
          "required": ["number"],
          "not": { "required": ["values"] },
          "properties": { "op": { "enum": ["lt", "le", "ge", "gt"] } }
        }
      ]
    },
    "citation": {
      "type": "object",
      "required": ["target"],
      "additionalProperties": false,
      "properties": {
        "target": { "$ref": "#/$defs/recordRef" },
        "role": { "type": "string", "minLength": 1 }
      }
    },
    "incoming": {
      "type": "object",
      "required": ["role", "exists"],
      "additionalProperties": false,
      "properties": {
        "role": { "type": "string", "minLength": 1 },
        "exists": { "type": "boolean" }
      }
    }
  }
}