#!/bin/sh

# Play audio script for ClockChimes

# Copyright 2018 - Stu Miller - Colorado, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Function - input: UC - output: LC
lowercase () {
  LC=$(echo $UC | tr [:upper:] [:lower:])
} # END lowercase

# function - input: ARRAY, KEY - output: VALUE
read_array(){
  # indirect reference method
  TMP=${ARRAY}[KEY]
  VALUE=${!TMP}
} # END read_array

# Function - input: CHIME, STRIKE - output: sox audio
play_chimestrike(){
#echo "play_chimestrike - #1:"$chime$strike":"
  # check chimestrike null
  if [ "$CHIME$STRIKE" != "" ]; then
    # determine user based on 1st local display
    # last - reads /var/log/wtmp file
    # grep - looks for ":0" followed by "still logged in"
    # awk - uses 1st line and 1st field, ignores remaining lines
    USER=$(last | grep -E :0.*"still logged in" | awk 'NR==1{print $1}')

    # play as default root user or user currently logged in
    # for play commands, see: man sox
    # functionaly equivalent to: sox -q $CHIME$STRIKE -d
    if [[ "$USER" == "" || "$USER" == "root" ]]; then
      # play as root
      /usr/bin/play -q $CHIME$STRIKE
    else
      # play as user currently logged in
      su -l $USER -c "/usr/bin/play -q $CHIME$STRIKE"
    fi # END play as root or user
  fi # END chimestrike null
#echo "play_chimestrike - :end:"
} # END play_chimestrike

# Function - requires: read_array - input: CONTROL[], MINUTE, LOOP - output: STRIKE
set_strike(){
#echo "START set_strike - #1:play_strike:"${CONTROL[2]}":minute:"$MINUTE":loop:"$LOOP":"
  # check play strike
  if [ ${CONTROL[2]} == "yes" ]; then
    # check min 00
    if [[ "$MINUTE" == "00" || "$MINUTE" == "0" ]]; then
      # set strike to play, minus last
      while [ "$LOOP" -gt "1" ]; do
        # concatenate pre & strike
        ARRAY=${CONTROL[0]}; KEY="4"; read_array
        STRIKE=$STRIKE" "$PRE$VALUE
        # decrement loop counter
        LOOP=$(($LOOP-1))
      done # END strike loop
      # concatenate last pre & strike
      ARRAY=${CONTROL[0]}; KEY="5"; read_array
      STRIKE=$STRIKE" "$PRE$VALUE
    fi # END min 00
  fi # END play strike
#echo "END set_strike - strike:"$STRIKE":"
} # END set_strikes

# Function - requires: read_array - input: CONTROL[], MINUTE - output: CHIME
set_chime(){
#echo "START set_chime - #1:play_chime:"${CONTROL[1]}":minute:"$MINUTE":"
  # check play chimes
  if [ "${CONTROL[1]}" == "yes" ]; then
    # check minute on the quarter hour
    if [ "$MINUTE" == "00" ]; then
      ARRAY=${CONTROL[0]}; KEY="0"; read_array
      CHIME=$PRE$VALUE
    elif [ "$MINUTE" == "15" ]; then
      ARRAY=${CONTROL[0]}; KEY="1"; read_array
      CHIME=$PRE$VALUE
    elif [ "$MINUTE" == "30" ]; then
      ARRAY=${CONTROL[0]}; KEY="2"; read_array
      CHIME=$PRE$VALUE
    elif [ "$MINUTE" == "45" ]; then
      ARRAY=${CONTROL[0]}; KEY="3"; read_array
      CHIME=$PRE$VALUE
    fi # END minute on the quarter hour
  fi # END play chimes
#echo "END set_chime - chime:"$CHIME":"
} # END set_chime

# Function - input: $1, $2, $3 - output: LOOP, MINUTE
test(){
#echo "START test_script - #1:"$1":"$2":"$3":"
  USAGE="TEST FAILED: requires 2nd & 3rd integer arguments"
  # check for arguments
  if [[ "$2" != "" && "$3" != "" ]]; then
    USAGE="TEST FAILED: 2nd argument represents hours. It must be an integer <= 24"
    # check hour argument is integer
    if [ "$2" -eq "$2" ] 2>/dev/null; then
      # check hour argument is -le 24
      if [ $2 -le 12 ]; then
        LOOP=$2
      elif [ $2 -le 24 ]; then
        LOOP=$(($2-12))
      else
        echo $USAGE; exit
      fi # END hour argument is -le 24
    else
      echo $USAGE; exit
    fi # END hour argument is integer
    USAGE="TEST FAILED: 3rd argument represents minutes. It must be an integer <= 45"
    # check minute argument is integer
    if [ "$3" -eq "$3" ] 2>/dev/null; then
      # check minute argument -le 45
      if [ $3 -le 45 ]; then
        MINUTE=$3
      else
        echo $USAGE; exit
      fi # END minute argument -le 45
    else
      echo $USAGE; exit
    fi # END minute argument is integer
  else
    echo $USAGE; exit
  fi # END check for arguments
#echo "END test_script - loop:"$LOOP":minute:"$MINUTE":"
  echo "NOTE: requires logged in user password if NOT running as root"
} # END test

# source config file
. /etc/clockchimes.conf

# sound directory
SND_DIR="/usr/share/sounds/clockchimes/"

# prefix volume factor, sound directory & chime name
UC=${CONTROL[0]}; lowercase
PRE="-v "${CONTROL[3]}" "$SND_DIR$LC"/"

# system minute
MINUTE=$(date +"%M")

# system hour, 12 hour clock
HOUR=$(date +"%I")

# loop counter, strip leading "0" from system hour
LOOP=$((10#$HOUR))

# version language
VERSION="clockchimes v0.2
Copyright 2018 - Stu Miller - Colorado, USA
All rights reserved."

# usage language
USAGE="Usage: $0 [OPTION]
Play clock chimes and hour strikes.

  --help        display this help and exit
  --test        test sample time, add hour & minute
  --version     display version information and exit

Report bugs to <slackbuilds@go4it2day.com>."

# Main routine
# check for options
case $1 in
  '--help')
    printf '%s\n' "$USAGE" || exit
  ;;
  '--test')
    # must pass script arguments to funtions
    test $1 $2 $3
  ;;
  '--version')
    printf '%s\n' "$VERSION" || exit
  ;;
esac

set_chime
set_strike
play_chimestrike