CouchDB: map/reduce selection by time span and additional keys

Question

CouchDB

The database contains the following documents:

{
    "user_id": 1,
    "event_id": 2,
    "event_dt": [
        2013, 11, 15, 10, 0, 0, 0
    ]
}

I would like to get an answer to the question using map / reduce: how many events of each type occurred for a specific user in a given period of time.
The only solution I see so far is to use two views and significant support from the application code.
First, we select all user events in a given period of time. In this case, of course, you will have to choose page by page (you need your own implementation using limit=XXX), because the time interval can be up to a year.

function map(doc) {
    emit([doc.user_id, doc.event_dt], doc.event_id);
}

Then for each custom event, we request the number of occurrences in the same given time interval ( group_level=2):

function map(doc) {
    emit([doc.user_id, doc.event_id, doc.event_dt], 1);
}

I would like to get away from the need to repeatedly call the database and reduce the whole thing to one request.