{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/api-evangelist/kgateway/blob/main/json-schema/backend.json",
  "title": "kgateway Backend",
  "description": "Backend defines a routable backend such as an AI provider, AWS Lambda function, or static server for use by Gateways.",
  "type": "object",
  "properties": {
    "apiVersion": {
      "type": "string",
      "const": "gateway.kgateway.dev/v1alpha1",
      "description": "API version for the Backend resource."
    },
    "kind": {
      "type": "string",
      "const": "Backend",
      "description": "Resource kind."
    },
    "metadata": {
      "type": "object",
      "description": "Standard Kubernetes object metadata.",
      "properties": {
        "name": {
          "type": "string",
          "description": "Name of the Backend resource."
        },
        "namespace": {
          "type": "string",
          "description": "Namespace of the Backend resource."
        },
        "labels": {
          "type": "object",
          "additionalProperties": { "type": "string" }
        },
        "annotations": {
          "type": "object",
          "additionalProperties": { "type": "string" }
        }
      },
      "required": ["name"]
    },
    "spec": {
      "type": "object",
      "description": "BackendSpec defines the desired state of a Backend.",
      "properties": {
        "type": {
          "type": "string",
          "description": "Type of the backend.",
          "enum": ["Static", "AWS", "AI"]
        },
        "static": {
          "type": "object",
          "description": "Static backend configuration.",
          "properties": {
            "hosts": {
              "type": "array",
              "description": "List of static hosts.",
              "items": {
                "type": "object",
                "properties": {
                  "host": {
                    "type": "string",
                    "description": "Hostname or IP address."
                  },
                  "port": {
                    "type": "integer",
                    "description": "Port number."
                  },
                  "tls": {
                    "type": "object",
                    "description": "TLS configuration for the host.",
                    "properties": {
                      "sni": { "type": "string" }
                    }
                  }
                }
              }
            }
          }
        },
        "aws": {
          "type": "object",
          "description": "AWS Lambda backend configuration.",
          "properties": {
            "region": {
              "type": "string",
              "description": "AWS region."
            },
            "lambdaFunctionName": {
              "type": "string",
              "description": "Name of the AWS Lambda function."
            },
            "accountId": {
              "type": "string",
              "description": "AWS account ID."
            },
            "roleArn": {
              "type": "string",
              "description": "ARN of the IAM role to assume."
            }
          }
        },
        "ai": {
          "type": "object",
          "description": "AI provider backend configuration.",
          "properties": {
            "provider": {
              "type": "object",
              "description": "Configuration for the LLM provider.",
              "properties": {
                "type": {
                  "type": "string",
                  "enum": ["openai", "azure", "gemini", "mistral"]
                },
                "openai": {
                  "type": "object",
                  "properties": {
                    "authToken": { "$ref": "#/$defs/AuthToken" }
                  }
                },
                "azure": {
                  "type": "object",
                  "properties": {
                    "endpoint": { "type": "string" },
                    "deploymentName": { "type": "string" },
                    "apiVersion": { "type": "string" },
                    "authToken": { "$ref": "#/$defs/AuthToken" }
                  }
                },
                "gemini": {
                  "type": "object",
                  "properties": {
                    "authToken": { "$ref": "#/$defs/AuthToken" }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "$defs": {
    "AuthToken": {
      "type": "object",
      "properties": {
        "secretRef": {
          "type": "object",
          "properties": {
            "name": { "type": "string" },
            "namespace": { "type": "string" }
          }
        }
      }
    }
  }
}