{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://nightscout.github.io/schemas/policy-composition.schema.json",
  "title": "PolicyComposition",
  "description": "Materialized view of effective therapy parameters computed from active profile and overrides",
  "type": "object",
  "required": ["compositionId", "references", "effectiveParameters", "computedBy", "validFrom"],
  "properties": {
    "compositionId": {
      "type": "string",
      "format": "uuid",
      "description": "Unique identifier for this composition snapshot"
    },
    "references": {
      "type": "object",
      "required": ["profileId", "profileHash"],
      "description": "References to source objects used in this composition",
      "properties": {
        "profileId": {
          "type": "string",
          "description": "Active ProfileDefinition ID"
        },
        "profileHash": {
          "type": "string",
          "pattern": "^[a-f0-9]{64}$",
          "description": "Content hash of active profile for verification"
        },
        "activeOverrideInstanceIds": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Currently active OverrideInstance IDs"
        },
        "capabilitySnapshotId": {
          "type": ["string", "null"],
          "description": "Reference to CapabilitySnapshot if available"
        }
      }
    },
    "effectiveParameters": {
      "type": "object",
      "description": "Computed therapy parameters currently in force",
      "properties": {
        "targetRange": {
          "type": "object",
          "required": ["low", "high"],
          "properties": {
            "low": {
              "type": "number",
              "description": "Effective lower target bound"
            },
            "high": {
              "type": "number",
              "description": "Effective upper target bound"
            }
          }
        },
        "effectiveISF": {
          "type": "number",
          "description": "Effective insulin sensitivity factor for current time"
        },
        "effectiveCR": {
          "type": "number",
          "description": "Effective carb ratio for current time"
        },
        "effectiveBasal": {
          "type": "number",
          "description": "Effective basal rate for current time (after multipliers)"
        },
        "scheduledBasal": {
          "type": "number",
          "description": "Scheduled basal rate from profile (before multipliers)"
        },
        "basalMultiplier": {
          "type": "number",
          "description": "Aggregate basal multiplier from overrides"
        },
        "sensitivityMultiplier": {
          "type": "number",
          "description": "Aggregate sensitivity multiplier from overrides"
        },
        "maxBasalAllowed": {
          "type": "number",
          "description": "Maximum basal rate allowed by constraints"
        },
        "maxBolusAllowed": {
          "type": "number",
          "description": "Maximum bolus allowed by constraints"
        },
        "maxIOB": {
          "type": "number",
          "description": "Maximum IOB allowed by constraints"
        },
        "automationEnabled": {
          "type": "boolean",
          "description": "Whether closed-loop automation is active"
        },
        "automationMode": {
          "type": "string",
          "enum": ["closedLoop", "openLoop", "suspended", "manual"],
          "description": "Current automation mode"
        }
      }
    },
    "computedBy": {
      "type": "object",
      "required": ["computedAt"],
      "properties": {
        "controllerKind": {
          "type": "string",
          "description": "Controller type that computed this (loop, trio, aaps, nightscout)"
        },
        "controllerVersion": {
          "type": "string",
          "description": "Controller version"
        },
        "controllerInstanceId": {
          "type": "string",
          "description": "Specific controller instance ID"
        },
        "computedAt": {
          "type": "string",
          "format": "date-time",
          "description": "When this composition was computed"
        }
      }
    },
    "validFrom": {
      "type": "string",
      "format": "date-time",
      "description": "When this composition became valid"
    },
    "validTo": {
      "type": ["string", "null"],
      "format": "date-time",
      "description": "When this composition was superseded; null if current"
    },
    "cursor": {
      "type": "integer",
      "description": "Global ordering cursor for event stream"
    },
    "previousCompositionId": {
      "type": ["string", "null"],
      "description": "Previous composition for audit chain"
    }
  }
}