// common/proto/table_validation.proto
syntax = "proto3";
package komp_ac.table_validation;

// Request validation rules for a table
message GetTableValidationRequest {
  string profile_name = 1;
  string table_name = 2;
}

// Response with field-level validations; if a field is omitted,
// no validation is applied (default unspecified).
message TableValidationResponse {
  repeated FieldValidation fields = 1;
}

// Field-level validation (extensible for future kinds)
message FieldValidation {
  // MUST match your frontend FormState.data_key for the column
  string data_key = 1;

  // Current: only CharacterLimits. More rules can be added later.
  CharacterLimits limits = 10;
  // Future expansion:
  // PatternRules pattern = 11;
  // DisplayMask mask = 12;
  // ExternalValidation external = 13;
  // CustomFormatter formatter = 14;
}

// Character length counting mode
enum CountMode {
  COUNT_MODE_UNSPECIFIED = 0; // default: same as CHARS
  CHARS = 1;
  BYTES = 2;
  DISPLAY_WIDTH = 3;
}

// Character limit validation (Validation 1)
message CharacterLimits {
  // When zero, the field is considered "not set". If both min/max are zero,
  // the server should avoid sending this FieldValidation (no validation).
  uint32 min = 1;
  uint32 max = 2;

  // Optional warning threshold; when unset, no warning threshold is applied.
  optional uint32 warn_at = 3;

  CountMode count_mode = 4; // defaults to CHARS if unspecified
}

// Service to fetch validations for a table
service TableValidationService {
  rpc GetTableValidation(GetTableValidationRequest)
      returns (TableValidationResponse);
}