{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://yovision.local/contracts/events/v1/event.schema.json",
  "title": "YoVision anonymous safety event v1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version", "producer_id", "source_event_id", "site_ref", "device_ref",
    "profile_ref", "event_type", "occurred_at", "severity", "rule", "model",
    "observation", "region", "evidence"
  ],
  "properties": {
    "schema_version": {"const": "yovision.event/v1"},
    "producer_id": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
    "source_event_id": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
    "site_ref": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
    "device_ref": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
    "profile_ref": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
    "event_type": {"enum": ["dangerous_area_entered", "directional_line_crossed"]},
    "occurred_at": {"type": "string", "format": "date-time", "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\\.[0-9]{3}Z$"},
    "severity": {"enum": ["low", "medium", "high", "critical"]},
    "rule": {
      "type": "object", "additionalProperties": false, "required": ["rule_id", "version"],
      "properties": {
        "rule_id": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
        "version": {"type": "string", "minLength": 1, "maxLength": 64}
      }
    },
    "model": {
      "type": "object", "additionalProperties": false, "required": ["name", "version"],
      "properties": {
        "name": {"type": "string", "minLength": 1, "maxLength": 128},
        "version": {"type": "string", "minLength": 1, "maxLength": 64}
      }
    },
    "observation": {
      "type": "object", "additionalProperties": false,
      "required": ["track_id", "category", "confidence"],
      "properties": {
        "track_id": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
        "category": {"enum": ["person", "vehicle", "other"]},
        "confidence": {"type": "number", "minimum": 0, "maximum": 1},
        "bbox_normalized": {
          "type": "array", "minItems": 4, "maxItems": 4,
          "items": {"type": "number", "minimum": 0, "maximum": 1}
        }
      }
    },
    "region": {
      "type": "object", "additionalProperties": false,
      "required": ["region_id", "kind"],
      "properties": {
        "region_id": {"type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"},
        "kind": {"enum": ["area", "line"]},
        "crossing_direction": {"enum": ["a_to_b", "b_to_a"]}
      },
      "allOf": [
        {"if": {"properties": {"kind": {"const": "line"}}, "required": ["kind"]}, "then": {"required": ["crossing_direction"]}},
        {"if": {"properties": {"kind": {"const": "area"}}, "required": ["kind"]}, "then": {"not": {"required": ["crossing_direction"]}}}
      ]
    },
    "evidence": {
      "type": "array", "maxItems": 8, "uniqueItems": true,
      "items": {"$ref": "../../evidence/v1/evidence-reference.schema.json"}
    }
  },
  "allOf": [
    {
      "if": {"properties": {"event_type": {"const": "dangerous_area_entered"}}, "required": ["event_type"]},
      "then": {"properties": {"region": {"properties": {"kind": {"const": "area"}}}}}
    },
    {
      "if": {"properties": {"event_type": {"const": "directional_line_crossed"}}, "required": ["event_type"]},
      "then": {"properties": {"region": {"properties": {"kind": {"const": "line"}}}}}
    }
  ]
}