{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://remora.invalid/api/events.schema.json",
  "title": "Remora WebSocket frame",
  "oneOf": [
    {"$ref": "#/$defs/JobChanged"},
    {"$ref": "#/$defs/DeletionChanged"},
    {"$ref": "#/$defs/ResyncRequired"},
    {"$ref": "#/$defs/Heartbeat"}
  ],
  "$defs": {
    "OpaqueId": {
      "type": "string",
      "pattern": "^[A-Za-z0-9][A-Za-z0-9_-]{7,127}$"
    },
    "Cursor": {
      "type": "string",
      "minLength": 16,
      "maxLength": 2048
    },
    "Attempt": {
      "type": "object",
      "additionalProperties": false,
      "required": ["attempt_id", "fence"],
      "properties": {
        "attempt_id": {"$ref": "#/$defs/OpaqueId"},
        "fence": {"type": "integer", "minimum": 1}
      }
    },
    "Progress": {
      "type": "object",
      "additionalProperties": false,
      "required": ["attempt_id", "fence", "completed_bytes", "completed_members"],
      "properties": {
        "attempt_id": {"$ref": "#/$defs/OpaqueId"},
        "fence": {"type": "integer", "minimum": 1},
        "completed_bytes": {"type": "integer", "minimum": 0},
        "total_bytes": {"type": ["integer", "null"], "minimum": 0},
        "completed_members": {"type": "integer", "minimum": 0},
        "total_members": {"type": ["integer", "null"], "minimum": 0}
      }
    },
    "ServerBase": {
      "type": "object",
      "required": ["schema_version", "kind", "event_id", "sequence", "cursor", "occurred_at"],
      "properties": {
        "schema_version": {"const": 1},
        "kind": {"type": "string"},
        "event_id": {"$ref": "#/$defs/OpaqueId"},
        "sequence": {"type": "integer", "minimum": 1},
        "cursor": {"$ref": "#/$defs/Cursor"},
        "occurred_at": {"type": "string", "format": "date-time"}
      }
    },
    "JobChanged": {
      "allOf": [
        {"$ref": "#/$defs/ServerBase"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["schema_version", "kind", "event_id", "sequence", "cursor", "occurred_at", "job_id", "job_revision", "phase", "lifecycle", "authoritative_attempt", "progress"],
          "properties": {
            "schema_version": {"const": 1},
            "kind": {"const": "job_changed"},
            "event_id": {"$ref": "#/$defs/OpaqueId"},
            "sequence": {"type": "integer", "minimum": 1},
            "cursor": {"$ref": "#/$defs/Cursor"},
            "occurred_at": {"type": "string", "format": "date-time"},
            "job_id": {"$ref": "#/$defs/OpaqueId"},
            "job_revision": {"type": "integer", "minimum": 1},
            "phase": {"enum": ["Queued", "Running", "RetryWait", "Cancelling", "Succeeded", "Failed", "Cancelled"]},
            "lifecycle": {"enum": ["visible", "soft_deleted", "hard_deleting", "hard_deleted"]},
            "authoritative_attempt": {"oneOf": [{"$ref": "#/$defs/Attempt"}, {"type": "null"}]},
            "progress": {"oneOf": [{"$ref": "#/$defs/Progress"}, {"type": "null"}]}
          }
        }
      ]
    },
    "DeletionChanged": {
      "allOf": [
        {"$ref": "#/$defs/ServerBase"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["schema_version", "kind", "event_id", "sequence", "cursor", "occurred_at", "job_id", "operation_id", "state"],
          "properties": {
            "schema_version": {"const": 1},
            "kind": {"const": "deletion_changed"},
            "event_id": {"$ref": "#/$defs/OpaqueId"},
            "sequence": {"type": "integer", "minimum": 1},
            "cursor": {"$ref": "#/$defs/Cursor"},
            "occurred_at": {"type": "string", "format": "date-time"},
            "job_id": {"$ref": "#/$defs/OpaqueId"},
            "operation_id": {"$ref": "#/$defs/OpaqueId"},
            "state": {"enum": ["queued", "running", "retry_wait", "blocked", "completed"]}
          }
        }
      ]
    },
    "ResyncRequired": {
      "allOf": [
        {"$ref": "#/$defs/ServerBase"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["schema_version", "kind", "event_id", "sequence", "cursor", "occurred_at", "reason"],
          "properties": {
            "schema_version": {"const": 1},
            "kind": {"const": "resync_required"},
            "event_id": {"$ref": "#/$defs/OpaqueId"},
            "sequence": {"type": "integer", "minimum": 1},
            "cursor": {"$ref": "#/$defs/Cursor"},
            "occurred_at": {"type": "string", "format": "date-time"},
            "reason": {"enum": ["cursor_absent", "cursor_invalid", "cursor_expired", "authorization_changed", "history_unavailable"]}
          }
        }
      ]
    },
    "Heartbeat": {
      "allOf": [
        {"$ref": "#/$defs/ServerBase"},
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["schema_version", "kind", "event_id", "sequence", "cursor", "occurred_at"],
          "properties": {
            "schema_version": {"const": 1},
            "kind": {"const": "heartbeat"},
            "event_id": {"$ref": "#/$defs/OpaqueId"},
            "sequence": {"type": "integer", "minimum": 1},
            "cursor": {"$ref": "#/$defs/Cursor"},
            "occurred_at": {"type": "string", "format": "date-time"}
          }
        }
      ]
    }
  }
}