{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://recipes.uuard.com/schemas/v2/source-mapping.schema.json",
  "title": "Nutrition or allergen source mapping",
  "type": "object",
  "required": ["schema_version", "id", "subject", "mapping_type", "source", "status"],
  "additionalProperties": false,
  "properties": {
    "schema_version": { "$ref": "common.schema.json#/$defs/schemaVersion" },
    "id": { "$ref": "common.schema.json#/$defs/id" },
    "subject": {
      "type": "object",
      "required": ["type", "id"],
      "additionalProperties": false,
      "properties": {
        "type": { "type": "string", "enum": ["ingredient", "purchase_item", "recipe"] },
        "id": { "$ref": "common.schema.json#/$defs/id" }
      }
    },
    "mapping_type": { "type": "string", "enum": ["nutrition", "allergen"] },
    "status": { "type": "string", "enum": ["candidate", "reviewed", "rejected", "superseded"] },
    "source": { "$ref": "common.schema.json#/$defs/sourceReference" },
    "usda": {
      "type": "object",
      "required": ["fdc_id", "data_type", "description"],
      "additionalProperties": false,
      "properties": {
        "fdc_id": { "type": "integer", "minimum": 1 },
        "data_type": { "type": "string", "enum": ["Foundation", "SR Legacy", "FNDDS", "Branded", "Experimental"] },
        "description": { "$ref": "common.schema.json#/$defs/nonEmptyString" },
        "brand_owner": { "type": "string" },
        "gtin_upc": { "type": "string" }
      }
    },
    "nutrition_per_100g": {
      "type": "object",
      "additionalProperties": { "type": ["number", "null"], "minimum": 0 },
      "propertyNames": { "pattern": "^[a-z][a-z0-9_]*_(?:g|mg|mcg|kcal|kj)$" }
    },
    "allergens": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["allergen_id", "presence"],
        "additionalProperties": false,
        "properties": {
          "allergen_id": { "$ref": "common.schema.json#/$defs/id" },
          "presence": { "type": "string", "enum": ["contains", "may_contain", "free_from", "unknown"] }
        }
      }
    }
  },
  "allOf": [
    {
      "if": { "properties": { "source": { "properties": { "source_type": { "const": "usda_fdc" } } } } },
      "then": { "required": ["usda"] }
    },
    {
      "if": { "properties": { "mapping_type": { "const": "nutrition" } } },
      "then": { "required": ["nutrition_per_100g"] },
      "else": { "required": ["allergens"] }
    }
  ]
}