{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/united-natural-foods/main/json-schema/unfi-supplier-order-schema.json",
  "title": "UNFI Purchase Order",
  "description": "Schema representing a UNFI wholesale purchase order between UNFI and a supplier.",
  "type": "object",
  "properties": {
    "orderId": {
      "type": "string",
      "description": "UNFI internal order identifier"
    },
    "purchaseOrderNumber": {
      "type": "string",
      "description": "Customer-facing purchase order number"
    },
    "status": {
      "type": "string",
      "enum": ["pending", "confirmed", "shipped", "delivered", "cancelled"],
      "description": "Order fulfillment status"
    },
    "supplierId": {
      "type": "string",
      "description": "UNFI supplier identifier"
    },
    "warehouseId": {
      "type": "string",
      "description": "Destination UNFI warehouse identifier"
    },
    "orderDate": {
      "type": "string",
      "format": "date",
      "description": "Order placement date"
    },
    "requiredDeliveryDate": {
      "type": "string",
      "format": "date",
      "description": "Required delivery date at UNFI warehouse"
    },
    "lineItems": {
      "type": "array",
      "description": "Order line items",
      "items": {
        "$ref": "#/$defs/OrderLineItem"
      },
      "minItems": 1
    },
    "totalAmount": {
      "type": "number",
      "format": "double",
      "minimum": 0,
      "description": "Total order cost in USD"
    }
  },
  "required": ["orderId", "purchaseOrderNumber", "status", "supplierId", "warehouseId", "orderDate"],
  "$defs": {
    "OrderLineItem": {
      "type": "object",
      "title": "Order Line Item",
      "description": "A single product line item within a purchase order",
      "properties": {
        "lineId": {
          "type": "string",
          "description": "Line item identifier"
        },
        "productId": {
          "type": "string",
          "description": "UNFI product identifier"
        },
        "upc": {
          "type": "string",
          "description": "Product UPC"
        },
        "quantityOrdered": {
          "type": "integer",
          "minimum": 1,
          "description": "Number of units ordered"
        },
        "quantityShipped": {
          "type": "integer",
          "minimum": 0,
          "description": "Number of units shipped"
        },
        "unitCost": {
          "type": "number",
          "format": "double",
          "minimum": 0,
          "description": "Cost per unit in USD"
        },
        "totalCost": {
          "type": "number",
          "format": "double",
          "minimum": 0,
          "description": "Total line item cost in USD"
        }
      },
      "required": ["productId", "quantityOrdered", "unitCost"]
    }
  }
}