Chronological order of ayahs

We know that in Quran the surahs are ordered in a certain way, but the chronological order of the revelation of the surahs is different. (One can see that in here .) My questions are: 1) Are ayahs inside a surah ordered according to revelation of them? 2) Surahs have a revelation order. But was it the case that one surah was revealed completely? In other words, were the ayahs revealed randomly and later composed in particular surahs the way scholars saw fit? 3) Did prophet Muhammed (PBUH) approved or had any say about the present composition/structure of the entire book? Additionally I am interested to know the process of collecting and ordering the ayahs/surahs to the present format.