LinuxQuestions.org - Using awk/sed to convert linefeed to csv, with some formatting

I have a file that looks like the one below, only much larger:

Code:

2009-02-20

this is some text

145 sometimes numbers and text with spaces.





2009-02-07

this is some different text

276 sometimes numbers and text with spaces.





2007-12-18

thisisoneword

13 sometimes numbers and text with spaces.

I would like to change it like this:

Code:

2009-02-20, "this is some text", 145, "sometimes numbers and text with spaces."

2009-02-07, "this is some different text", 276, "sometimes numbers and text with spaces."

2007-12-18, "thisisoneword", 13, "sometimes numbers and text with spaces."

Top line, always a date in that format.
Middle line, text or numbers
bottom line, always an integer, a space, then random text. I want to seperate the first number from the rest with a comma.

The pattern and spacing is exactly like above.