#!/bin/bash

###                    fc-presets v.0.9.3                    ###
### Set default fontconfig presets for your font collection. ###
###          (Thanks cfr for testing and suggestions.)       ###
###                                                          ###
###                Copyright (c) 2016 bohoomil               ###
### The MIT License (MIT) http://opensource.org/licenses/MIT ###
###      part of infinality-bundle  http://bohoomil.com      ###

RED='\E[01;31m'
GRE='\E[01;32m'
YEL='\E[01;33m'
RES='\E[0m'

presets_dir="/etc/fonts/conf.avail.infinality"
config_dir="/etc/fonts/conf.d"

presets_list=(combi free ms remix)
options=(combi free ms remix reset quit)

option=$1

usage(){
  echo "Usage: ${0##*/} [check|set|help]"
  echo ''
  echo ' Run this script to set a fontconfig preset for your default'
  echo ' font collection. You can also check which preset you are'
  echo ' currently using.'
  echo ''
  echo 'Options:'
  echo ' check    Check which preset is currently active'
  echo ' set      Set a preset configuration (requires root privileges)'
  echo '          Available presets are:'
  echo '             combi  --  custom font collection'
  echo '              free  --  free font collection'
  echo '                ms  --  Microsoft font collection'
  echo '             remix  --  remix collection'
  echo ' help     Print this help and exit'
  echo ''
  echo 'Troubleshooting:'
  echo '================'
  echo ' If the [ preset ] has been set correctly, <fc-presets check> should'
  echo ' return the following information (only one [ preset ] can be set!):'
  echo '    [ preset1 ] not set'
  echo '    [ preset3 ] not set'
  echo ''
  echo '    The active preset seems to be [ preset2 ].'
  echo '    Checking symlinks now...'
  echo ''
  echo '    30-metric-aliases-preset2.conf is OK'
  echo '    37-repl-global-preset2.conf is OK'
  echo '    60-latin-preset2.conf is OK'
  echo '    65-non-latin-preset2.conf is OK'
  echo '    66-aliases-wine-preset2.conf is OK'
  echo ''
  echo ' If checking symlinks has completed successfully but at least one'
  echo ' of the lines reads:'
  echo '    37-repl-global-free.conf is NOT OK'
  echo '    :: Run <fc-presets help> for more information.'
  echo ' then the symbolic link must be broken.'
  echo ' How to fix:'
  echo ' -----------'
  echo ' 1. Run <fc-presets set> as root.'
  echo ' 2. Choose 4) to disable all presets.'
  echo ' 3. Re-run <fc-presets set> as root and choose a preset 1) - 3).'
  echo ''
  echo ' If no preset has been set (which means that at least 1 symbolic link'
  echo ' from a preset is missing), the relevant message is displayed:'
  echo '    [ combi ] not set'
  echo '    [ ms ] not set'
  echo '    [ free ] not set'
  echo '    [ remix ] not set'
  echo ' How to fix:'
  echo ' -----------'
  echo ' 1. Run <fc-presets set> as root and choose a preset 1) - 3).'
  echo ' 2. If the error is returned:'
  echo '      [ preset ] preset is currently in use. Aborting. '
  echo '    first reset current settings and then set the preset again.'
  echo ''
  exit 1
}

OK(){
  echo -e 'Done.'
  exit 0
}

NOTOK(){
  echo -e 'An error occured. Check the content of'
  echo -e "$config_dir manually."
  exit 1
}

check_current(){
  pushd $config_dir >/dev/null
  for preset in ${presets_list[@]}; do
    check_preset=$(ls *.conf | grep "\-$preset.conf")
    count_all=$(echo $check_preset | wc -w)
    if [[ $? -ne 0 ]] || [[ $count_all -ne 5 ]]; then
      echo -e " [ $preset ] is not set "
      echo -e " $YEL:: Run <fc-presets help> for more information.$RES"
    else
      echo ''
      echo " $count_all symlinks found."
      echo " The active preset seems to be [ $preset ]."
      echo ' Checking symlinks now...'
      echo ''
      i=1
      ls *.conf | grep "\-$preset.conf" | while read line; do
      array[ $i ]="$line"
      if [ -e "$line" ]; then
        echo -e "$line$GRE is OK$RES"
      else
        echo -e "$line$RED is NOT OK$RES"
        echo -e " $YEL:: Run <fc-presets help> for more information.$RES"
      fi
      (( i++ ))
      done
      exit 0
    fi
  done
  popd >/dev/null
}

check_current_prejob(){
  pushd $config_dir >/dev/null
  targets_current=("30-metric-aliases-$option.conf" "37-repl-global-$option.conf" "60-latin-$option.conf" "65-non-latin-$option.conf" "66-aliases-wine-$option.conf")
  for preset in ${targets_current[@]}; do
    check_current=$(ls *.conf | grep "\-$option.conf")
    count_all=$(echo $check_current | wc -w)
    if [[ -e $preset ]] && [[ $count_all -eq 5 ]]; then
      echo -e " You are already using [ $option ] preset. Aborting."
      exit 1
    fi
  done
  popd >/dev/null
}

targets_check_prejob(){
  pushd $presets_dir >/dev/null
  preset_selected=$(ls "$option"/*\-$option.conf | wc -w)
  if [ $preset_selected -lt 5 ]; then
      echo -e 'Target not found. Did you set up'
      echo -e 'fontconfig-infinality-ultimate correctly?'
      exit 1
    fi
  popd >/dev/null
}

fc_reset(){
  pushd $config_dir >/dev/null
  targets_rm=("30-metric-aliases-*.conf" "37-repl-global-*.conf" "60-latin-*.conf" "65-non-latin-*.conf" "66-aliases-wine-*.conf")
  for target in "${targets_rm[@]}"; do
    # remove old
    if [ $UID -ne 0 ]; then
      echo -e 'Run the script again as root to commit changes.'
      exit 1
    else
      rm $target >/dev/null 2>&1
    fi
  done
  popd >/dev/null
}

fc_set(){
  pushd $config_dir >/dev/null
  check_preset=$(ls | grep "\-$option.conf")
  count_all=$(echo $check_preset | wc -w)
  if [[ $? -eq 0 ]] && [[ $count_all -eq 5 ]]; then
    current=$option
    echo -e " [ $current ] preset is currently in use. Aborting."
  else
    if [ $UID -ne 0 ]; then
      echo -e 'Run the script again as root to commit changes.'
      exit 1
    else
      preset=$option
      # create new
      targets_list=$(ls $presets_dir/$preset/*.conf)
      for target in ${targets_list[@]}; do
        ln -sf $target $config_dir
      done
    fi
  fi
  popd >/dev/null
}

custom_postjob(){
  pushd $config_dir >/dev/null
  targets_current=("30-metric-aliases-$option.conf" "37-repl-global-$option.conf" "60-latin-$option.conf" "65-non-latin-$option.conf" "66-aliases-wine-$option.conf")
  for preset in ${targets_current[@]}; do
    check_current=$(ls *.conf | grep "\-$option.conf")
    if [[ $check_current == *combi* ]] && [[ -f $config_dir/35-repl-custom.conf ]]; then
      rm -f 35-repl-custom.conf 2>/dev/null
    elif [[ $check_current == *free* ]] || [[ $check_current == *ms* ]] || [[ $check_current == *remix* ]]; then
      if [ ! -f 35-repl-custom ]; then
        ln -s $presets_dir/35-repl-custom.conf $config_dir/35-repl-custom.conf 2>/dev/null
      fi
    fi
  done
  popd >/dev/null
}

set_preset(){
  PS3='Enter your choice... '
  select preset in "${options[@]}"; do
    case "$preset" in
      combi)
        echo ' [ combi ] preset chosen...'
        option='combi'
        check_current_prejob
        targets_check_prejob
        fc_reset
        fc_set
        custom_postjob
        [ $? -eq 0 ] && OK || NOTOK
        ;;
      free)
        echo ' [ free ] preset chosen...'
        option='free'
        check_current_prejob
        targets_check_prejob
        fc_reset
        fc_set
        custom_postjob
        [ $? -eq 0 ] && OK || NOTOK
        ;;
      ms)
        echo ' [ ms ] preset chosen...'
        option='ms'
        check_current_prejob
        targets_check_prejob
        fc_reset
        fc_set
        custom_postjob
        [ $? -eq 0 ] && OK || NOTOK
        ;;
      remix)
        echo ' [ remix ] preset chosen...'
        option='remix'
        check_current_prejob
        targets_check_prejob
        fc_reset
        fc_set
        custom_postjob
        [ $? -eq 0 ] && OK || NOTOK
        ;;
      reset)
        echo ' Removing current preset...'
        fc_reset
        [ $? -eq 0 ] && echo -e 'Done. Now select a new preset...'
        continue
        ;;
      quit)
        echo ' No preset chosen. Aborting.'
        break
        exit 1
        ;;
      *)
        echo 'Invalid option. Try again:'
        continue
        ;;
    esac
  break
  unset $current
  unset $option
done
exit 0
}

howto(){
  echo -e "Run '${0##*/} help' to list available options."
  echo -e ''
  echo -e 'Unknown or no option selected, aborting.'
  exit 1
}

case $option in
  help)
    usage
    ;;
  check)
    check_current
    ;;
  set)
    set_preset
    ;;
  *)
    howto
    ;;
esac