Who is responsible for budget 2018?

It took our leaders in government eight months to pass the budget. Now that they have passed it into law, its not out of place to ask who is responsible for the document that would to a large extent guide us in our spending and development processes for the next one year. I am a bit confused here, and perhaps those of you who read this would be able to clarify: what role does the legislative have in budgeting for this country called Nigeria? Recently, the law makers increased the budget of N 8 Trillion to N 9.3 Trillion. They also raised their own recurrent expenditure from N125 billion to N139 billion. Why are their expenses going up? Are they increasing their own salaries? To add insult to injury, they cut financing on major roads all around the country and budgeted for their strange constituency projects.
When you look at the components of the budgetary allocations that they made for their own spending you would wonder if they are not rivaling governors in their various constituencies.
The National Assembly, like the Governors in the states are becoming lords unto themselves. Nobody seems to be able to check them. Their sundry idea of empowerment is to conduct seminars on agriculture and give Tricycles to their constituents. My question is: should all of this come from a federal budget? Industrial sewing machines, grinding machines etc?
I have seen tricycles in Lagos with the names of Legislators inscribed on them. What does this mean? Do we believe that the money actually comes from their pockets? Or is it from their constituency allowances? How do they decide who should be empowered among the multitudes in their constituencies?
In all this, I blame our rather intellectually indolent Attorney General who should be able to challenge some of the actions of the legislative in court and forget some of these strange cases he has been filing. Abubakar Malami has again failed in his responsibility of safe guarding the FG from constitutional embarrassment. Are our legislators now playing the executive function? Should they stop road and bridge projects from being completed just to satisfy their personal dispositions? Someone ought to challenge them. Pray, who is responsible for budget 2018? Why should the president complain publicly and appear to be asking us for help? Why does President Buhari seem to have signed the document reluctantly?