Shell script if statement compraising of string comparision and boolean check

I have a function where in I'm trying to compare the first parameter to a string, and then a separate boolean variable.

My sample bools:

EMS=true; 
COLL=true;

At a given point, both or any one or none of them can be true.

My function body:

function some_function() {
...
...
     if [ [ "$1" = "ez" ] &&  $EMS ] || [ "$1" = "coll" ] &&  $COLL ]; then
     #do mysterious magic
     ...
     ...
fi
}

I'm calling the function like so:

some_function ez
some_function coll

However when I execute the script, I run into this:

./deployBuild.sh: line 145: [: too many arguments

My if loop is incorrect and I'm unable to fix it. How do I proceed with?

Pseudo code of what I want to achieve:

if ("$1" is "ez" AND $EMS evaluates to true) OR ("$1" is "coll" AND $COL evaluates to true)