combine columns datas for identical values in first column

see attached excel.

i have a list made by 4 columns. the columns C is not important, the columns A,B,D contains data i need to reorganize.

In column A there are values ("point"), some are repeated several times and for each one there are values in column B but only sometime in comlum D.

For every value ("point") i need to write, in a single cell, all the "types" and if a "value" is present it should be written between commas after the type.

is there a way to make it by formulas?