{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api.tropicapp.io/schemas/contract",
  "title": "Contract",
  "description": "A vendor contract managed in the Tropic procurement platform",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique contract identifier"
    },
    "name": {
      "type": "string",
      "description": "Contract display name",
      "minLength": 1,
      "maxLength": 255
    },
    "supplier_id": {
      "type": "string",
      "description": "ID of the associated supplier"
    },
    "supplier_name": {
      "type": "string",
      "description": "Name of the associated supplier"
    },
    "status": {
      "type": "string",
      "enum": ["active", "expired", "pending", "cancelled"],
      "description": "Current contract status"
    },
    "start_date": {
      "type": "string",
      "format": "date",
      "description": "Contract effective start date (ISO 8601)"
    },
    "end_date": {
      "type": "string",
      "format": "date",
      "description": "Contract end date (ISO 8601)"
    },
    "renewal_date": {
      "type": "string",
      "format": "date",
      "description": "Date the contract is up for renewal"
    },
    "total_value": {
      "type": "number",
      "minimum": 0,
      "description": "Total contract value in the specified currency"
    },
    "currency": {
      "type": "string",
      "default": "USD",
      "description": "ISO 4217 currency code"
    },
    "owner_id": {
      "type": "string",
      "description": "User ID of the contract owner"
    },
    "documents": {
      "type": "array",
      "description": "Attached contract documents",
      "items": {
        "type": "object",
        "properties": {
          "id": { "type": "string" },
          "name": { "type": "string" },
          "url": { "type": "string", "format": "uri" }
        },
        "required": ["id", "name"]
      }
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the contract was created"
    },
    "updated_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the contract was last updated"
    }
  },
  "required": ["id", "name", "status", "start_date"],
  "additionalProperties": false
}