// Cannot implicitly shard accessed collections because the "jsMode" option to the "mapReduce"
// command cannot be used on a sharded collection.
// @tags: [
//   assumes_unsharded_collection,
//   # mapReduce does not support afterClusterTime.
//   does_not_support_causal_consistency,
//   does_not_support_stepdowns,
// ]

t = db.mr2;
t.drop();

t.save({comments: [{who: "a", txt: "asdasdasd"}, {who: "b", txt: "asdasdasdasdasdasdas"}]});

t.save({comments: [{who: "b", txt: "asdasdasdaaa"}, {who: "c", txt: "asdasdasdaasdasdas"}]});

function m() {
    for (var i = 0; i < this.comments.length; i++) {
        var c = this.comments[i];
        emit(c.who, {totalSize: c.txt.length, num: 1});
    }
}

function r(who, values) {
    var n = {totalSize: 0, num: 0};
    for (var i = 0; i < values.length; i++) {
        n.totalSize += values[i].totalSize;
        n.num += values[i].num;
    }
    return n;
}

function reformat(r) {
    var x = {};
    var cursor;
    if (r.results)
        cursor = r.results;
    else
        cursor = r.find();
    cursor.forEach(function(z) {
        x[z._id] = z.value;
    });
    return x;
}

function f(who, res) {
    res.avg = res.totalSize / res.num;
    return res;
}

res = t.mapReduce(m, r, {finalize: f, out: "mr2_out"});
printjson(res);
x = reformat(res);
assert.eq(9, x.a.avg, "A1");
assert.eq(16, x.b.avg, "A2");
assert.eq(18, x.c.avg, "A3");
res.drop();

// inline does needs to exist - so set it to false to make sure the code is just checking for
// existence
res = t.mapReduce(m, r, {finalize: f, out: {inline: 0}});
printjson(res);
x = reformat(res);
assert.eq(9, x.a.avg, "B1");
assert.eq(16, x.b.avg, "B2");
assert.eq(18, x.c.avg, "B3");
res.drop();
assert(!("result" in res), "B4");

res = t.mapReduce(m, r, {finalize: f, out: "mr2_out", jsMode: true});
printjson(res);
x = reformat(res);
assert.eq(9, x.a.avg, "A1");
assert.eq(16, x.b.avg, "A2");
assert.eq(18, x.c.avg, "A3");
res.drop();

res = t.mapReduce(m, r, {finalize: f, out: {inline: 5}, jsMode: true});
printjson(res);
x = reformat(res);
assert.eq(9, x.a.avg, "B1");
assert.eq(16, x.b.avg, "B2");
assert.eq(18, x.c.avg, "B3");
res.drop();
assert(!("result" in res), "B4");