{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:emergency-signal:v1",
  "title": "EmergencySignal v1",
  "description": "Machine-readable schema for one emergency-ingest fact entering the crisis evaluation pipeline. This contract models a reporting signal, not an activation decision. It stays below `emergency-activation.v1` and above raw connector telemetry.",
  "type": "object",
  "additionalProperties": true,
  "x-dia-workflow": "project",
  "x-dia-status": "draft",
  "x-dia-basis": [
    "doc/normative/50-constitutional-ops/en/EMERGENCY-ACTIVATION-CRITERIA.en.md",
    "doc/project/20-memos/emergency-signal-v1-invariants.md"
  ],
  "required": [
    "schema/v",
    "signal/id",
    "source/node-id",
    "source/type",
    "observed/at",
    "trigger/class",
    "description",
    "evidence/ref",
    "confidence/class",
    "corroborating/signal-refs",
    "tc5/active",
    "metadata/affected-scope",
    "metadata/urgency"
  ],
  "properties": {
    "schema/v": {
      "const": 1,
      "description": "Schema version."
    },
    "signal/id": {
      "type": "string",
      "minLength": 1,
      "description": "Stable identifier of the emergency signal."
    },
    "source/node-id": {
      "type": "string",
      "pattern": "^node:did:key:z[1-9A-HJ-NP-Za-km-z]+$",
      "description": "Canonical identity of the reporting node."
    },
    "source/type": {
      "type": "string",
      "enum": [
        "sensorium",
        "operator",
        "peer_report",
        "oracle"
      ],
      "description": "Source class of the emergency signal."
    },
    "observed/at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the signal was observed or emitted."
    },
    "trigger/class": {
      "type": "string",
      "enum": [
        "TC1",
        "TC2",
        "TC3",
        "TC4",
        "TC5"
      ],
      "description": "Emergency trigger class from `EMERGENCY-ACTIVATION-CRITERIA`."
    },
    "description": {
      "type": "string",
      "minLength": 1,
      "description": "Human-readable summary of the observed condition."
    },
    "evidence/ref": {
      "type": "string",
      "minLength": 1,
      "description": "Reference to auditable evidence backing the signal."
    },
    "confidence/class": {
      "type": "string",
      "enum": [
        "C0",
        "C1",
        "C2",
        "C3",
        "C4"
      ],
      "description": "Credibility class of the observed signal."
    },
    "corroborating/signal-refs": {
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 1
      },
      "uniqueItems": true,
      "description": "References to other signals that corroborate the current one."
    },
    "tc5/active": {
      "type": "boolean",
      "description": "Whether degraded-trust mode is active for this signal."
    },
    "metadata/geo-hint": {
      "type": "string",
      "description": "Optional coarse location hint."
    },
    "metadata/affected-scope": {
      "type": "string",
      "enum": [
        "node",
        "federation",
        "inter-federation"
      ],
      "description": "Operational scope affected by the reported condition."
    },
    "metadata/urgency": {
      "type": "string",
      "enum": [
        "immediate",
        "hours",
        "days"
      ],
      "description": "Expected time pressure of the condition."
    },
    "notes": {
      "type": "string",
      "description": "Optional human-readable notes."
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {
          "trigger/class": {
            "const": "TC5"
          }
        },
        "required": [
          "trigger/class"
        ]
      },
      "then": {
        "properties": {
          "tc5/active": {
            "const": true
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "tc5/active": {
            "const": true
          }
        },
        "required": [
          "tc5/active"
        ]
      },
      "then": {
        "properties": {
          "trigger/class": {
            "const": "TC5"
          }
        }
      }
    }
  ]
}