/**
 * Tests the basic indexes operations on sharded time-series collection.
 * patterns.
 *
 * @tags: [
 *   requires_fcv_51,
 * ]
 */

(function() {
load("jstests/core/timeseries/libs/timeseries.js");
load('jstests/libs/analyze_plan.js');

Random.setRandomSeed();

const dbName = 'testDB';
const collName = 'testColl';
const timeField = 'time';
const metaField = 'hostid';

const st = new ShardingTest({shards: 2, rs: {nodes: 2}});
const sDB = st.s.getDB(dbName);
const shard0DB = st.shard0.getDB(dbName);
const shard1DB = st.shard1.getDB(dbName);

if (!TimeseriesTest.shardedtimeseriesCollectionsEnabled(st.shard0)) {
    jsTestLog("Skipping test because the sharded time-series collection feature flag is disabled");
    st.stop();
    return;
}

// Helpers.
let currentId = 0;
function generateId() {
    return currentId++;
}

function generateDoc(time, metaValue) {
    return TimeseriesTest.generateHosts(1).map((host, index) => Object.assign({}, host, {
        _id: generateId(),
        [metaField]: metaValue,
        [timeField]: ISODate(time),
    }))[0];
}

// Shard key on just the time field.
(function timeShardKey() {
    const mongosDB = st.s.getDB(dbName);
    assert.commandWorked(mongosDB.adminCommand({enableSharding: dbName}));
    st.ensurePrimaryShard(dbName, st.shard0.shardName);

    // Shard time-series collection.
    const shardKey = {[timeField]: 1};
    assert.commandWorked(mongosDB.adminCommand({
        shardCollection: `${dbName}.${collName}`,
        key: shardKey,
        timeseries: {timeField, metaField, granularity: "hours"},
    }));

    // Split the chunks such that primary shard has chunk: [MinKey, 2020-01-01) and other shard has
    // chunk [2020-01-01, MaxKey].
    splitPoint = {[`control.min.${timeField}`]: ISODate(`2020-01-01`)};
    assert.commandWorked(
        mongosDB.adminCommand({split: `${dbName}.system.buckets.${collName}`, middle: splitPoint}));

    // Move one of the chunks into the second shard.
    const primaryShard = st.getPrimaryShard(dbName);
    const otherShard = st.getOther(primaryShard);
    assert.commandWorked(mongosDB.adminCommand({
        movechunk: `${dbName}.system.buckets.${collName}`,
        find: splitPoint,
        to: otherShard.name,
        _waitForDelete: true,
    }));

    // Ensure that each shard owns one chunk.
    const counts = st.chunkCounts(`system.buckets.${collName}`, dbName);
    assert.eq(1, counts[primaryShard.shardName], counts);
    assert.eq(1, counts[otherShard.shardName], counts);

    const coll = mongosDB.getCollection(collName);

    let extraIndexes = [];
    let extraBucketIndexes = [];
    if (TimeseriesTest.timeseriesScalabilityImprovementsEnabled(st.shard0)) {
        // When enabled, the {meta: 1, time: 1} index gets built by default on the time-series
        // bucket collection.
        extraIndexes.push({[metaField]: 1, [timeField]: 1});
        extraBucketIndexes.push({"meta": 1, "control.min.time": 1, "control.max.time": 1});
    }

    for (let i = 0; i < 2; i++) {
        assert.commandWorked(coll.insert(generateDoc("2019-11-11", -1)));
        assert.commandWorked(coll.insert(generateDoc("2019-12-31", -1)));
        assert.commandWorked(coll.insert(generateDoc("2020-01-21", i)));
        assert.commandWorked(coll.insert(generateDoc("2020-11-31", 1)));
    }

    assert.commandWorked(coll.createIndex({[metaField]: 1}));

    let plan = coll.find({[metaField]: 0}).explain();
    assert.eq(getAggPlanStages(plan, "IXSCAN").length, 2, plan);

    const subField1 = `${metaField}.subField1`;
    const subField2 = `${metaField}.subField2`;

    assert.commandWorked(coll.createIndex({[subField1]: 1}));
    assert.commandWorked(coll.createIndex({[subField2]: 1}));

    const listIndexesOutput = assert.commandWorked(coll.runCommand({listIndexes: coll.getName()}));
    assert.eq(coll.getFullName(), listIndexesOutput.cursor.ns, listIndexesOutput);

    let indexKeys = listIndexesOutput.cursor.firstBatch.map(x => x.key);
    assert.sameMembers(
        [{[subField1]: 1}, {[subField2]: 1}, {[timeField]: 1}, {[metaField]: 1}].concat(
            extraIndexes),
        indexKeys);

    assert.commandWorked(coll.dropIndex({[subField2]: 1}));
    indexKeys = coll.getIndexes().map(x => x.key);
    assert.sameMembers([{[subField1]: 1}, {[timeField]: 1}, {[metaField]: 1}].concat(extraIndexes),
                       indexKeys);

    plan = coll.find({[metaField]: 0}).explain();
    assert.eq(getAggPlanStages(plan, "IXSCAN").length, 2, plan);

    assert.commandWorked(coll.dropIndex({[metaField]: 1}));
    indexKeys = coll.getIndexes().map(x => x.key);
    assert.sameMembers([{[subField1]: 1}, {[timeField]: 1}].concat(extraIndexes), indexKeys);

    plan = coll.find({[subField2]: 0}).explain();
    assert.eq(getAggPlanStages(plan, "COLLSCAN").length, 2, plan);

    // Verify that running the commands on the buckets collection should work.
    const bucketsColl = mongosDB.getCollection(`system.buckets.${collName}`);
    const outputOnBucketsColl =
        assert.commandWorked(bucketsColl.runCommand({listIndexes: bucketsColl.getName()}));
    assert.eq(bucketsColl.getFullName(), outputOnBucketsColl.cursor.ns, outputOnBucketsColl);

    assert.commandWorked(bucketsColl.dropIndex({'meta.subField1': 1}));
    indexKeys = bucketsColl.getIndexes().map(x => x.key);
    assert.sameMembers([{'control.min.time': 1}].concat(extraBucketIndexes), indexKeys);

    assert.commandWorked(bucketsColl.createIndex({'meta.subField2': 1}));
    indexKeys = bucketsColl.getIndexes().map(x => x.key);
    assert.sameMembers([{'control.min.time': 1}, {'meta.subField2': 1}].concat(extraBucketIndexes),
                       indexKeys);

    assert(coll.drop());
})();

st.stop();
})();