ApiResponse.ts

export type ToCamelCase<S extends string> =
  S extends `${infer Head}_${infer Tail}`
    ? `${Head}${Capitalize<ToCamelCase<Tail>>}`
    : S;

export type ObjectToCamel<T> = T extends readonly unknown[]
  ? { [K in keyof T]: ObjectToCamel<T[K]> }
  : T extends object
  ? {
      [K in keyof T as ToCamelCase<Extract<K, string>>]: ObjectToCamel<T[K]>;
    }
  : T;

type StringNumber = '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | '0';

export type ToSnakeCase<S extends string> = S extends `${infer T}${infer U}`
  ? `${T extends Exclude<Capitalize<T>, StringNumber>
      ? '_'
      : ''}${Lowercase<T>}${ToSnakeCase<U>}`
  : S;

export type ObjectToSnake<T> = T extends readonly unknown[]
  ? { [K in keyof T]: ObjectToSnake<T[K]> }
  : T extends object
  ? {
      [K in keyof T as ToSnakeCase<Extract<K, string>>]: ObjectToSnake<T[K]>;
    }
  : T;

interface ApiResponseSuccess<T> {
  data: ObjectToCamel<T>;
  error: null;
}

interface ApiResponseError {
  data: null;
  error: { message: string };
}

export type ApiResponse<T> = Promise<ApiResponseSuccess<T> | ApiResponseError>;

export function notEmpty<TValue>(
  value: TValue | null | undefined
): value is TValue {
  if (value === null || value === undefined) return false;
  return true;
}