#!/usr/bin/env bash

# Unoffical Bash "strict mode"
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -euo pipefail
#ORIGINAL_IFS=$IFS
IFS=$'\t\n' # Stricter IFS settings

# Data dir
data_dir=${1:-}

# Output dir
output_dir=${2:-}

generate_combined_csv_for_command() {
  local command_name
  command_name=${1:-}

  # Print CSV header
  echo "version,command,mean,stddev,median,user,system,min,max"

  # Combine multiple CSVs
  ls "$data_dir/"*"$command_name".csv | sort -V | for file in $(cat /dev/stdin); do
    # Print the version from the filename
    echo -n "$(basename "$file")" | cut -f1 -d_ | tr '\n' ' '

    # get all but the first row of the CSV (header) from the file
    benchmark_data="$(tail -n 1 < "$file")";

    # Check if we have benchmark data for this command, we may not if the
    # command wasn't able in this version of asdf
    if [ -z "$benchmark_data" ]; then
      # if empty print an entire empty row
      echo ",,,,,,,,"
    else
      # Print comma following the version
      echo -n ","
      # print all but the first row of the CSV (header) from the file
      echo -n "$benchmark_data"
    fi
    # Print a trailing newline
    echo;
  done | sed -e '/^$/d'
}

# Generate a combined file for each command we've benchmarked
generate_combined_csv_for_command "asdf-current" > "$output_dir"/asdf-current.csv
generate_combined_csv_for_command "asdf-exec-lua--v" > "$output_dir"/asdf-exec.csv
generate_combined_csv_for_command "asdf-reshim" > "$output_dir"/asdf-reshim.csv
generate_combined_csv_for_command "asdf-where-lua" > "$output_dir"/asdf-where.csv
generate_combined_csv_for_command "asdf-which-lua" > "$output_dir"/asdf-which.csv