need help on battery charger

[sohel]

assalamu alikum

i have a design which charge 120a/h battery from 145v ac . can some one write an programme for this type of design.
it charge

if main ac voltege 220ac it charge 11A

if main ac voltage 145ac it charge 11A constant

first sence main ac voltage then send frequency to moc for constant ampare.

if battery label 14v then its stop charging

please write software with basic

thanks