Module UI.Common

let validationContainer: ValidationContainer<Decimal | null, string> | null = null;

try {
  const validationContainer = new ValidationContainer(
    () => (!!value ? new Decimal(value) : null),
    () => value
  );

  const validator: ValidationContainerValidator<Decimal | null, string> = context => {
    if (!context.value?.greaterThan(0)) {
      const error = 'The value must be greater than "0".';
      context.validationResult.add(ValidationResult.fromText(error, ValidationResultType.Error));
      context.handled = true; // To interrupt the chain of handlers, the value must be set to `true`.
    }
  };

  validationContainer.add(validator, { id: 'Greater than zero' });

  validationContainer.isEmpty: // false
  validationContainer.size; // 1
  validationContainer.has(validator) // true
  validationContainer.result.hasErrors; // true
  validationContainer.removeById('Greater than zero'); // true
  validationContainer.remove(validator); // false (already removed)

} finally {
  validationContainer?.dispose();
}
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validationContainer.isManual = false;
validationContainer.result; // some result

validationContainer.isManual = true;
validationContainer.result; // empty result
validationContainer.validate(value);
validationContainer.result; // some result

validationContainer.isManual = false;
validationContainer.addAsync(
  async context => {
    if (!(await checkValue(context.value))) {
      const warning = 'Warnings occurred while checking a value.';
      context.validationResult.add(
        ValidationResult.fromText(warning, ValidationResultType.Warning)
      );
    }
  },
  { order: 0 }
);

validationContainer.hasAsync; // true
const validationResult = await validationContainer.validateAsync(value);
validationContainer.result === validationResult; // true;
validationContainer.result.hasWarnings; // true
validationContainer.validate(value); // exception
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