Changes in file (huge problem)

["Mário Gamito" <gamito@gmail.com>]

Hi,

I have this file in the following format:

tarta 16340309 marsanpin brigittamario@xxx.pt
lms doom123 Luis Miguel Sequeira lms@xxx.pt
jura teste Juraci jgweb@bol.com.br
jsilva t00lt0ya5 Jorge Silva jsilva@xxx.com
tchock  mail#4829 tchock  engDias@xxx.pt
reporterx noname Duarte Oliveira mtbf99@xxx.com
erkulix brunoverab4 Bruno Cruz

First field is a username;
Second field is a password in clear text;
*Last field is the email;
The field between is the name.

As you can see, some lines don't have the name, and names have an unknow 
number of words.
Some lines don't have the e-mail.

What i need is:
Change the second field to the correspondent md5 hash.
Insert foo@foo.foo in the end of the lines that have no email.
Insert the string "NO_NAME" in the ones that don't have a name in it's 
field.
Substitute spaces for ":", *except* of course the spaces within the name.

I know how to do some of these things, others i don't.

Can someone help me, please ?

Thanks in advance.

Warm Regards,
Mário Gamito
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