To control number of bars in a bar chart based on date selection by user

Hello,

I have a date parameter which has a week split.

When I select Week 4 I need 4 bars(one for each week viz Week1, Week2, Week3, Week4) in a chart with sum of sales data.

When I select Week 3 I need 3 bars(one for each week viz Week1, Week2, Week3) in a chart with sum of sales data

and so on ...so when I select Week 1, i will have just one bar in my chart.

I tried using DATEDIFF with last() but I am not able to control the number of bars in the bar chart

I have attached a sample workbook.