{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://nightscout.github.io/schemas/delivery-observation.schema.json",
  "title": "DeliveryObservation",
  "description": "Observed/confirmed insulin delivery from any source (pump, pen, injection)",
  "type": "object",
  "required": ["observationId", "observationType", "source", "observed", "reportedBy", "observedAt"],
  "properties": {
    "observationId": {
      "type": "string",
      "format": "uuid",
      "description": "Unique identifier for this observation"
    },
    "observationType": {
      "type": "string",
      "enum": ["basal", "tempBasal", "bolus", "microBolus", "suspend", "injection", "pen", "inhaler"],
      "description": "Type of delivery observed"
    },
    "source": {
      "type": "object",
      "required": ["sourceType"],
      "description": "Where this delivery came from",
      "properties": {
        "sourceType": {
          "type": "string",
          "enum": ["pump", "manual", "pen", "inhaler", "estimated"],
          "description": "Category of delivery source"
        },
        "sourceId": {
          "type": "string",
          "description": "Device identifier if from pump"
        },
        "sourceKind": {
          "type": "string",
          "description": "Specific device type (omnipod, medtronic, tandem, novopen, etc.)"
        }
      }
    },
    "observed": {
      "type": "object",
      "description": "What was actually delivered",
      "properties": {
        "rate": {
          "type": "number",
          "minimum": 0,
          "description": "Observed rate in U/hr (for basal)"
        },
        "units": {
          "type": "number",
          "minimum": 0,
          "description": "Observed units delivered"
        },
        "duration": {
          "type": "integer",
          "minimum": 0,
          "description": "Duration in seconds (for temp basal)"
        },
        "startTime": {
          "type": "string",
          "format": "date-time",
          "description": "When delivery started"
        },
        "endTime": {
          "type": "string",
          "format": "date-time",
          "description": "When delivery ended (if completed)"
        }
      }
    },
    "confidence": {
      "type": "string",
      "enum": ["confirmed", "inferred", "reported", "estimated"],
      "description": "Confidence level of this observation"
    },
    "reportedBy": {
      "type": "object",
      "required": ["issuerType", "issuerId"],
      "properties": {
        "issuerType": {
          "type": "string",
          "enum": ["human", "controller", "agent", "caregiver", "pump"]
        },
        "issuerId": {
          "type": "string"
        }
      }
    },
    "observedAt": {
      "type": "string",
      "format": "date-time",
      "description": "When this observation was recorded"
    },
    "pumpResponse": {
      "type": "object",
      "description": "Response from pump if applicable",
      "properties": {
        "acked": {
          "type": "boolean",
          "description": "Whether pump acknowledged the command"
        },
        "errorCode": {
          "type": "string",
          "description": "Error code if failed"
        },
        "errorMessage": {
          "type": "string",
          "description": "Human-readable error message"
        },
        "rawResponse": {
          "type": "object",
          "description": "Raw pump response for debugging"
        }
      }
    },
    "relatedRequestId": {
      "type": ["string", "null"],
      "format": "uuid",
      "description": "DeliveryRequest this observation corresponds to, if any"
    },
    "annotations": {
      "type": "object",
      "description": "Additional context",
      "properties": {
        "notes": {
          "type": "string",
          "description": "Human-provided notes (e.g., 'correction for high')"
        },
        "mealContext": {
          "type": "string",
          "enum": ["breakfast", "lunch", "dinner", "snack", "correction", "other"]
        }
      }
    }
  }
}