export const createMWC = (a, b, r) => {

  const xi = new Array(r + 1)
  const ci = new Array (r + 1)

  let n0 = 0
  let nr = r

  let xn = 0
  let cn = 0

  return {
    init (seeds) {
      for (let k = 0; k < (r + 1); k++) {
        xi[k] = seeds[k]
        ci[k] = b - seeds[k]
      }
    },

    next() {
      let result = new Array (r + 1)

      xn =  (a * xi[nr] + ci[n0]) % b
      cn = Math.floor((a * xi[nr] + ci[n0]) / b)

      xi[n0] = xn
      ci[n0] = cn

      //console.log(xi)
      n0 = (n0 +  1) % (r + 1)
      nr = (nr +  1) % (r + 1)

      for(let t = 0; t < r + 1; t++) {
         //result[t] = xi[t] % b
        result[(t + n0) % (r + 1)] = xi[t]
      }

      return result
    }
  }
}