#!/usr/bin/env bash

CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
. $CURDIR/../shell_config.sh

REPLICAS=5

for i in `seq $REPLICAS`; do
    $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS concurrent_alter_mt_$i"
done

for i in `seq $REPLICAS`; do
    $CLICKHOUSE_CLIENT --query "CREATE TABLE concurrent_alter_mt_$i (key UInt64, value1 UInt64, value2 Int32) ENGINE = ReplicatedMergeTree('/clickhouse/tables/concurrent_alter_mt', '$i') ORDER BY key SETTINGS max_replicated_mutations_in_queue=1000, number_of_free_entries_in_pool_to_execute_mutation=0,max_replicated_merges_in_queue=1000"
done

$CLICKHOUSE_CLIENT --query "INSERT INTO concurrent_alter_mt_1 SELECT number, number + 10, number from numbers(10)"
$CLICKHOUSE_CLIENT --query "INSERT INTO concurrent_alter_mt_1 SELECT number, number + 10, number from numbers(10, 40)"

for i in `seq $REPLICAS`; do
    $CLICKHOUSE_CLIENT --query "SYSTEM SYNC REPLICA concurrent_alter_mt_$i"
done

for i in `seq $REPLICAS`; do
    $CLICKHOUSE_CLIENT --query "SELECT SUM(value1) FROM concurrent_alter_mt_$i"
done

INITIAL_SUM=`$CLICKHOUSE_CLIENT --query "SELECT SUM(value1) FROM concurrent_alter_mt_1"`

# This alters mostly requires not only metadata change
# but also conversion of data. Also they are all compatible
# between each other, so can be executed concurrently.
function correct_alter_thread()
{
    TYPES=(Float64 String UInt8 UInt32)
    while true; do
        REPLICA=$(($RANDOM % 5 + 1))
        TYPE=${TYPES[$RANDOM % ${#TYPES[@]} ]}
        $CLICKHOUSE_CLIENT --query "ALTER TABLE concurrent_alter_mt_$REPLICA MODIFY COLUMN value1 $TYPE SETTINGS replication_alter_partitions_sync=0"; # additionaly we don't wait anything for more heavy concurrency
        sleep 0.$RANDOM
    done
}

# This thread add some data to table. After we finish we can check, that
# all our data have same types.
# insert queries will fail sometime because of wrong types.
function insert_thread()
{

    VALUES=(7.0 7 '7')
    while true; do
        REPLICA=$(($RANDOM % 5 + 1))
        VALUE=${VALUES[$RANDOM % ${#VALUES[@]} ]}
        $CLICKHOUSE_CLIENT --query "INSERT INTO concurrent_alter_mt_$REPLICA VALUES($RANDOM, $VALUE, $VALUE)"
        sleep 0.$RANDOM
    done
}

# Some select load, to be sure, that our selects work in concurrent execution with alters
function select_thread()
{
    while true; do
        REPLICA=$(($RANDOM % 5 + 1))
        $CLICKHOUSE_CLIENT --query "SELECT SUM(toUInt64(value1)) FROM concurrent_alter_mt_$REPLICA" 1>/dev/null
        sleep 0.$RANDOM
    done
}


echo "Starting alters"
export -f correct_alter_thread;
export -f insert_thread;
export -f select_thread;


TIMEOUT=30


# Selects should run successfully
timeout $TIMEOUT bash -c select_thread &
timeout $TIMEOUT bash -c select_thread &
timeout $TIMEOUT bash -c select_thread &


timeout $TIMEOUT bash -c correct_alter_thread 2> /dev/null &
timeout $TIMEOUT bash -c correct_alter_thread 2> /dev/null &
timeout $TIMEOUT bash -c correct_alter_thread 2> /dev/null &


timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
timeout $TIMEOUT bash -c insert_thread 2> /dev/null &

wait

echo "Finishing alters"

# This alter will finish all previous, but replica 1 maybe still not up-to-date.
# If query will throw something, than we will sleep 1 and retry. If timeout
# happened we will silently go out of loop and probably fail tests in the
# following for loop.
#
# 120 seconds is more than enough, but in rare cases for slow builds (debug,
# thread) it maybe necessary.
while [[ $(timeout 120 $CLICKHOUSE_CLIENT --query "ALTER TABLE concurrent_alter_mt_1 MODIFY COLUMN value1 String SETTINGS replication_alter_partitions_sync=2" 2>&1) ]]; do
    sleep 1
done

for i in `seq $REPLICAS`; do
    $CLICKHOUSE_CLIENT --query "SYSTEM SYNC REPLICA concurrent_alter_mt_$i"
    $CLICKHOUSE_CLIENT --query "SELECT SUM(toUInt64(value1)) > $INITIAL_SUM FROM concurrent_alter_mt_$i"
    $CLICKHOUSE_CLIENT --query "SELECT COUNT() FROM system.mutations WHERE is_done=0 and table = 'concurrent_alter_mt_$i'" # all mutations have to be done
    $CLICKHOUSE_CLIENT --query "SELECT * FROM system.mutations WHERE is_done=0 and table = 'concurrent_alter_mt_$i'"
    $CLICKHOUSE_CLIENT --query "SELECT * FROM system.replication_queue WHERE table = 'concurrent_alter_mt_$i' and (type = 'ALTER_METADATA' or type = 'MUTATE_PART')"
    $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS concurrent_alter_mt_$i"
done