#!/bin/bash
set -ex
set -o pipefail
trap "exit" INT TERM
trap 'kill $(jobs -pr) ||:' EXIT
S3_URL=${S3_URL:="https://clickhouse-builds.s3.amazonaws.com"}
BUILD_NAME=${BUILD_NAME:-package_release}
export S3_URL BUILD_NAME

mkdir db0 ||:
mkdir left ||:

left_pr=$1
left_sha=$2

# right_pr=$3 not used for now
right_sha=$4

datasets=${CHPC_DATASETS-"hits1 hits10 hits100 values"}

declare -A dataset_paths
dataset_paths["hits10"]="https://clickhouse-private-datasets.s3.amazonaws.com/hits_10m_single/partitions/hits_10m_single.tar"
dataset_paths["hits100"]="https://clickhouse-private-datasets.s3.amazonaws.com/hits_100m_single/partitions/hits_100m_single.tar"
dataset_paths["hits1"]="https://clickhouse-datasets.s3.amazonaws.com/hits/partitions/hits_v1.tar"
dataset_paths["values"]="https://clickhouse-datasets.s3.amazonaws.com/values_with_expressions/partitions/test_values.tar"


function download
{
    # Historically there were various paths for the performance test package.
    # Test all of them.
    declare -a urls_to_try=(
        "$S3_URL/PRs/$left_pr/$left_sha/$BUILD_NAME/performance.tar.zst"
    )

    for path in "${urls_to_try[@]}"
    do
        if curl --fail --head "$path"
        then
            left_path="$path"
        fi
    done

    # Might have the same version on left and right (for testing) -- in this case we just copy
    # already downloaded 'right' to the 'left. There is the third case when we don't have to
    # download anything, for example in some manual runs. In this case, SHAs are not set.
    if ! [ "$left_sha" = "$right_sha" ]
    then
        wget -nv -nd -c "$left_path" -O- | tar -C left --no-same-owner --strip-components=1 --zstd --extract --verbose  &
    elif [ "$right_sha" != "" ]
    then
        mkdir left ||:
        cp -an right/* left &
    fi

    for dataset_name in $datasets
    do
        dataset_path="${dataset_paths[$dataset_name]}"
        if [ "$dataset_path" = "" ]
        then
            >&2 echo "Unknown dataset '$dataset_name'"
            exit 1
        fi
        cd db0 && wget -nv -nd -c "$dataset_path" -O- | tar --extract --verbose &
    done

    mkdir ~/fg ||:
    (
        cd ~/fg
        wget -nv -nd -c "https://raw.githubusercontent.com/brendangregg/FlameGraph/master/flamegraph.pl"
        wget -nv -nd -c "https://raw.githubusercontent.com/brendangregg/FlameGraph/master/difffolded.pl"
        chmod +x ~/fg/difffolded.pl
        chmod +x ~/fg/flamegraph.pl
    ) &

    wait
    echo "ATTACH DATABASE default ENGINE=Ordinary" > db0/metadata/default.sql
    echo "ATTACH DATABASE datasets ENGINE=Ordinary" > db0/metadata/datasets.sql
    ls db0/metadata
}

download