{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:middleware-channel-frame:v2",
  "title": "Middleware Channel Frame v2",
  "description": "Strict outer application frame for one accepted middleware channel session.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "schema/v",
    "session/id",
    "session/epoch",
    "frame/seq",
    "message/kind",
    "operation",
    "payload/schema",
    "payload"
  ],
  "properties": {
    "schema": {
      "const": "middleware-channel-frame.v2"
    },
    "schema/v": {
      "const": 2
    },
    "session/id": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/session~1id"
    },
    "session/epoch": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/session~1epoch"
    },
    "frame/seq": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/frame~1seq"
    },
    "message/kind": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/message~1kind"
    },
    "operation": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/operation"
    },
    "request/id": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/request~1id"
    },
    "reply/to": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/reply~1to"
    },
    "deadline/at": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/deadline~1at"
    },
    "trace/correlation-id": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/trace~1correlation-id"
    },
    "payload/schema": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/payload~1schema"
    },
    "payload": {
      "$ref": "middleware-channel-frame.v1.schema.json#/properties/payload"
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "request"
          }
        },
        "required": [
          "message/kind"
        ]
      },
      "then": {
        "required": [
          "request/id",
          "deadline/at"
        ],
        "not": {
          "required": [
            "reply/to"
          ]
        },
        "properties": {
          "operation": {
            "enum": [
              "middleware.init",
              "middleware.invoke",
              "module-http.invoke",
              "host-capability.invoke"
            ]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "response"
          }
        },
        "required": [
          "message/kind"
        ]
      },
      "then": {
        "required": [
          "reply/to"
        ],
        "not": {
          "anyOf": [
            {
              "required": [
                "request/id"
              ]
            },
            {
              "required": [
                "deadline/at"
              ]
            }
          ]
        },
        "properties": {
          "operation": {
            "enum": [
              "middleware.init",
              "middleware.invoke",
              "module-http.invoke",
              "host-capability.invoke"
            ]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "event"
          }
        },
        "required": [
          "message/kind"
        ]
      },
      "then": {
        "not": {
          "anyOf": [
            {
              "required": [
                "request/id"
              ]
            },
            {
              "required": [
                "reply/to"
              ]
            },
            {
              "required": [
                "deadline/at"
              ]
            }
          ]
        },
        "properties": {
          "operation": {
            "enum": [
              "middleware.observe",
              "middleware.trace.report"
            ]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "event"
          },
          "operation": {
            "const": "middleware.trace.report"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "component-communication-report.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "control"
          }
        },
        "required": [
          "message/kind"
        ]
      },
      "then": {
        "not": {
          "anyOf": [
            {
              "required": [
                "request/id"
              ]
            },
            {
              "required": [
                "reply/to"
              ]
            },
            {
              "required": [
                "deadline/at"
              ]
            }
          ]
        },
        "properties": {
          "operation": {
            "enum": [
              "request.cancel",
              "heartbeat",
              "session.shutdown"
            ]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "request"
          },
          "operation": {
            "const": "host-capability.invoke"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-channel-host-capability-call.v2"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "response"
          },
          "operation": {
            "const": "host-capability.invoke"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-channel-call-result.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "request"
          },
          "operation": {
            "const": "module-http.invoke"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-module-http-request.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "response"
          },
          "operation": {
            "const": "module-http.invoke"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-module-http-response.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "control"
          },
          "operation": {
            "const": "request.cancel"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-channel-request-cancel.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "control"
          },
          "operation": {
            "const": "heartbeat"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-channel-heartbeat.v1"
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "message/kind": {
            "const": "control"
          },
          "operation": {
            "const": "session.shutdown"
          }
        },
        "required": [
          "message/kind",
          "operation"
        ]
      },
      "then": {
        "properties": {
          "payload/schema": {
            "const": "middleware-channel-session-shutdown.v1"
          }
        }
      }
    }
  ],
  "$defs": {
    "id": {
      "$ref": "middleware-channel-frame.v1.schema.json#/$defs/id"
    },
    "schemaName": {
      "$ref": "middleware-channel-frame.v1.schema.json#/$defs/schemaName"
    }
  },
  "x-dia-basis": [
    "orbidocs:doc/project/40-proposals/080-multiplexed-middleware-channel-executor.md",
    "orbidocs:doc/project/40-proposals/086-component-communication-observation-and-trace-sessions.md",
    "orbidocs:doc/project/40-proposals/090-inference-execution-provenance-and-non-local-disclosure.md"
  ]
}