{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://project-alpha.tech/schemas/sync-contract-v2.schema.json",
  "title": "Project Alpha Sync Contract v2",
  "oneOf": [
    {
      "$ref": "#/$defs/snapshot"
    },
    {
      "$ref": "#/$defs/event"
    }
  ],
  "$defs": {
    "decimalString": {
      "type": "string",
      "pattern": "^(0|[1-9][0-9]*)$"
    },
    "sourcePublicId": {
      "type": "string",
      "pattern": "^[0-9a-f]{32}$"
    },
    "resource": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "type",
        "id",
        "version"
      ],
      "properties": {
        "type": {
          "enum": [
            "organization",
            "client",
            "project",
            "service_location",
            "job"
          ]
        },
        "id": {
          "type": "string",
          "minLength": 1,
          "maxLength": 191
        },
        "version": {
          "$ref": "#/$defs/decimalString"
        }
      }
    },
    "snapshotItem": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "resource",
        "data"
      ],
      "properties": {
        "resource": {
          "$ref": "#/$defs/resource"
        },
        "data": {
          "type": "object"
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "resource": {
                "properties": {
                  "type": {
                    "enum": ["organization", "client", "project"]
                  }
                }
              }
            }
          },
          "then": {
            "properties": {
              "data": {
                "required": ["public_id"],
                "properties": {
                  "public_id": {
                    "$ref": "#/$defs/sourcePublicId"
                  }
                }
              }
            }
          }
        }
      ]
    },
    "snapshot": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "contract_version",
        "source_instance_id",
        "snapshot",
        "items",
        "next_cursor"
      ],
      "properties": {
        "contract_version": {
          "const": "2.0"
        },
        "source_instance_id": {
          "type": "string",
          "format": "uuid"
        },
        "snapshot": {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "id",
            "generated_at",
            "expires_at",
            "high_water_sequence"
          ],
          "properties": {
            "id": {
              "type": "string",
              "format": "uuid"
            },
            "generated_at": {
              "type": "string",
              "format": "date-time"
            },
            "expires_at": {
              "type": "string",
              "format": "date-time"
            },
            "high_water_sequence": {
              "$ref": "#/$defs/decimalString"
            }
          }
        },
        "items": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/snapshotItem"
          }
        },
        "next_cursor": {
          "type": [
            "string",
            "null"
          ]
        },
        "request_id": {
          "type": "string"
        }
      }
    },
    "event": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "contract_version",
        "source_instance_id",
        "sequence",
        "event_id",
        "occurred_at",
        "resource",
        "action",
        "data"
      ],
      "properties": {
        "contract_version": {
          "const": "2.0"
        },
        "source_instance_id": {
          "type": "string",
          "format": "uuid"
        },
        "sequence": {
          "$ref": "#/$defs/decimalString"
        },
        "event_id": {
          "type": "string",
          "format": "uuid"
        },
        "occurred_at": {
          "type": "string",
          "format": "date-time"
        },
        "resource": {
          "$ref": "#/$defs/resource"
        },
        "action": {
          "enum": [
            "upsert",
            "delete"
          ]
        },
        "data": {
          "type": [
            "object",
            "null"
          ]
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "action": { "const": "upsert" },
              "resource": {
                "properties": {
                  "type": {
                    "enum": ["organization", "client", "project"]
                  }
                }
              }
            }
          },
          "then": {
            "properties": {
              "data": {
                "type": "object",
                "required": ["public_id"],
                "properties": {
                  "public_id": {
                    "$ref": "#/$defs/sourcePublicId"
                  }
                }
              }
            }
          }
        }
      ]
    }
  }
}