hi, welcome to HCM. I am Dr. Das.
I am giving your quieries one by one.
first of all viscosity of semen when increased it causes less motility of sperms.That means sperms are less active.Liquefaction within 1 hr means time required for sperms to get active for penetration. but the bad news is your sperm concentration is very low and no motile sperm means in your semen their is no alive sperm which can travel through vagina and causes fertilization of ovum. pus cells 3-4/hpf means you have no infection. Fructose teest positive means you have enough fructose in your semen and which denotes you donot have any blockage in the passage of semen.
so, in conclusion, it can be said that you have no active sperm in your semen not due to any obstruction but probably due defect in the production of sperm. I suggest you to do a hormonal
study of prolactin