/**
 * The C data types the memoization instrumentation library can handle.
 */
export enum MemoiDataType {
  INT = "INT",
  DOUBLE = "DOUBLE",
  FLOAT = "FLOAT",
}

export default class MemoiUtils {
  private static mathFunctionSigs: Set<string> = new Set([
    /* double, 1 parameter */
    "acos(double)",
    "acosh(double)",
    "asin(double)",
    "asinh(double)",
    "atan(double)",
    "atanh(double)",
    "cbrt(double)",
    "ceil(double)",
    "cos(double)",
    "cosh(double)",
    "erf(double)",
    "erfc(double)",
    "exp(double)",
    "exp2(double)",
    "expm1(double)",
    "fabs(double)",
    "floor(double)",
    "j0(double)",
    "j1(double)",
    "lgamma(double)",
    "log(double)",
    "log10(double)",
    "log1p(double)",
    "log2(double)",
    "logb(double)",
    "nearbyint(double)",
    "rint(double)",
    "round(double)",
    "sin(double)",
    "sinh(double)",
    "sqrt(double)",
    "tan(double)",
    "tanh(double)",
    "tgamma(double)",
    "trunc(double)",
    /* float, 1 parameter */
    "acosf(float)",
    "acoshf(float)",
    "asinf(float)",
    "asinhf(float)",
    "atanf(float)",
    "atanhf(float)",
    "cbrtf(float)",
    "ceilf(float)",
    "cosf(float)",
    "coshf(float)",
    "erfcf(float)",
    "erff(float)",
    "exp2f(float)",
    "expf(float)",
    "expm1f(float)",
    "fabsf(float)",
    "floorf(float)",
    "lgammaf(float)",
    "log10f(float)",
    "log1pf(float)",
    "log2f(float)",
    "logbf(float)",
    "logf(float)",
    "nearbyintf(float)",
    "rintf(float)",
    "roundf(float)",
    "sinf(float)",
    "sinhf(float)",
    "sqrtf(float)",
    "tanf(float)",
    "tanhf(float)",
    "tgammaf(float)",
    "truncf(float)",
    /* double,2 parameters */
    "atan2(double,double)",
    "copysign(double,double)",
    "fdim(double,double)",
    "fmax(double,double)",
    "fmin(double,double)",
    "fmod(double,double)",
    "hypot(double,double)",
    "nextafter(double,double)",
    "pow(double,double)",
    "remainder(double,double)",
    "scalb(double,double)",
    /* float, 2 parameters */
    "atan2f(float,float)",
    "copysignf(float,float)",
    "fdimf(float,float)",
    "fmaxf(float,float)",
    "fminf(float,float)",
    "fmodf(float,float)",
    "hypotf(float,float)",
    "nextafterf(float,float)",
    "powf(float,float)",
    "remainderf(float,float)",
  ]);

  /**
   * 		Tests whether the function with the given signature is whitelisted.
   * */
  static isWhiteListed(sig: string) {
    if (MemoiUtils.isMathFunction(sig)) {
      return true;
    }

    return false;
  }

  /**
   * 		Tests whether the function with the given signature is a math.h function.
   * */
  static isMathFunction(sig: string) {
    return MemoiUtils.mathFunctionSigs.has(sig);
  }

  static cSig(sig: string) {
    return sig
      .replace(/\(/g, "_")
      .replace(/\*/g, "_p")
      .replace(/ /g, "_")
      .replace(/,/g, "_")
      .replace(/\)/g, "_");
  }

  static normalizeSig(sig: string) {
    return sig.replace(/ /g, "");
  }

  /**
   * @deprecated Use javascript's array.includes method instead
   *
   */
  static arrayContains<T>(a: T[], e: T) {
    return a.includes(e);
  }

  static average(values: number[], count: number = values.length) {
    return values.reduce((a, b) => a + b, 0) / count;
  }
}