#!/usr/bin/env bash

# Requirements:
# - critcmp. See: https://github.com/BurntSushi/critcmp
# - curl

# Usage
# $ bash compare.sh json_file1 json_file1
# ex: bash compare.sh songs_main_09a4321.json songs_geosearch_24ec456.json

# Checking that critcmp is installed
command -v critcmp > /dev/null 2>&1
if [[ "$?" -ne 0 ]]; then
    echo 'You must install critcmp to make this script work.'
    echo 'See: https://github.com/BurntSushi/critcmp'
    echo '  $ cargo install critcmp'
    exit 1
fi

if [[ $# -ne 2 ]]
  then
    echo 'Need 2 arguments.'
    echo 'Usage: '
    echo '  $ ./compare.sh old new'
    echo 'Ex:'
    echo '  $ ./compare.sh songs_main_09a4321.json songs_geosearch_24ec456.json'
    exit 1
fi

old_file="$1"
new_file="$2"
s3_url='https://milli-benchmarks.fra1.digitaloceanspaces.com/critcmp_results'

for file in $old_file $new_file
do
    file_s3_url="$s3_url/$file"
    file_local_path="/tmp/$file"

    if [[ ! -f $file_local_path ]]; then
        curl $file_s3_url --output $file_local_path --silent
        if [[ "$?" -ne 0 ]]; then
            echo 'curl command failed.'
            exit 1
        fi
    fi
done

# Print the diff changes between the old and new benchmarks
# by only displaying the lines that have a diff of more than 5%.
critcmp --threshold 5 "/tmp/$old_file" "/tmp/$new_file"