// Write ops tests for partial indexes.

(function() {
    "use strict";
    var isMongos = (db.runCommand("isMaster").msg === "isdbgrid");
    var coll = db.index_partial_write_ops;

    var getNumKeys = function(idxName) {
        var res = assert.commandWorked(coll.validate(true));
        var kpi;
        if (isMongos) {
            kpi = res.raw[Object.getOwnPropertyNames(res.raw)[0]].keysPerIndex;
        } else {
            kpi = res.keysPerIndex;
        }
        return kpi[coll.getFullName() + ".$" + idxName];
    };

    coll.drop();

    // Create partial index.
    assert.commandWorked(coll.ensureIndex({x: 1}, {unique: true, partialFilterExpression: {a: 1}}));

    assert.writeOK(coll.insert({_id: 1, x: 5, a: 2, b: 1}));  // Not in index.
    assert.writeOK(coll.insert({_id: 2, x: 6, a: 1, b: 1}));  // In index.

    assert.eq(1, getNumKeys("x_1"));

    // Move into partial index, then back out.
    assert.writeOK(coll.update({_id: 1}, {$set: {a: 1}}));
    assert.eq(2, getNumKeys("x_1"));

    assert.writeOK(coll.update({_id: 1}, {$set: {a: 2}}));
    assert.eq(1, getNumKeys("x_1"));

    // Bit blip doc in partial index, and out of partial index.
    assert.writeOK(coll.update({_id: 2}, {$set: {b: 2}}));
    assert.eq(1, getNumKeys("x_1"));

    assert.writeOK(coll.update({_id: 1}, {$set: {b: 2}}));
    assert.eq(1, getNumKeys("x_1"));

    var array = [];
    for (var i = 0; i < 2048; i++) {
        array.push({arbitrary: i});
    }

    // Update that causes record relocation.
    assert.writeOK(coll.update({_id: 2}, {$set: {b: array}}));
    assert.eq(1, getNumKeys("x_1"));

    assert.writeOK(coll.update({_id: 1}, {$set: {b: array}}));
    assert.eq(1, getNumKeys("x_1"));

    // Delete that doesn't affect partial index.
    assert.writeOK(coll.remove({x: 5}));
    assert.eq(1, getNumKeys("x_1"));

    // Delete that does affect partial index.
    assert.writeOK(coll.remove({x: 6}));
    assert.eq(0, getNumKeys("x_1"));

    // Documents with duplicate keys that straddle the index.
    assert.writeOK(coll.insert({_id: 3, x: 1, a: 1}));  // In index.
    assert.writeOK(coll.insert({_id: 4, x: 1, a: 0}));  // Not in index.
    assert.writeErrorWithCode(
        coll.insert({_id: 5, x: 1, a: 1}),
        ErrorCodes.DuplicateKey);  // Duplicate key constraint prevents insertion.

    // Only _id 3 is in the index.
    assert.eq(1, getNumKeys("x_1"));

    // Remove _id 4, _id 3 should remain in index.
    assert.writeOK(coll.remove({_id: 4}));

    // _id 3 is still in the index.
    assert.eq(1, getNumKeys("x_1"));
})();