#!/bin/bash
#
# Build a sample dataset, shell script version.
#
# Copyright (C) 2021 Silvio Rhatto - rhatto@riseup.net
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Parameters
DIRNAME="`dirname $0`"
TESTS="$DIRNAME/../tests"
SAMPLE="$TESTS/sample.csv"
SEPARATOR=","
COLS="id a b c d e f g h i"
NCOLS="`echo $COLS | wc -w`"
ENTRIES="${1:-20}"

# Ensure the test folder and sample file exists
mkdir -p $TESTS
touch $SAMPLE
echo -n "" > $SAMPLE

# Write sample header
n=1
for col in $COLS; do
  if ((n < $NCOLS)); then
    echo -n "$col""$SEPARATOR" >> $SAMPLE
  else
    echo -n "$col" >> $SAMPLE
  fi

  let n++
done

echo "" >> $SAMPLE

# Write some rows
let limit="$NCOLS - 1"
for n in `seq 1 $ENTRIES`; do
  #echo -n "$n" >> $SAMPLE
  echo -n "$RANDOM" >> $SAMPLE

  for n in `seq 1 $limit`; do
    echo -n "$SEPARATOR""$RANDOM" >> $SAMPLE
  done

  echo "" >> $SAMPLE
done