#!/usr/bin/env bash

#######################################################################

# (C) Copyright Armaan Bhojwani, 2020

# 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 <https://www.gnu.org/licenses/>.

########################################################################

# Merge both global and local charfiles
CHARDIR=$HOME/.cache/charsel

if [[ ! -d $CHARDIR ]]
then
  mkdir $CHARDIR/
elif [[ ! "$(ls -A $CHARDIR)" ]]
then
  cp -rf /usr/share/charsel/- $CHARDIR/
  cp -rf $HOME/.local/share/charsel/- $CHARDIR/
fi

# Check for xclip
if [[ ! -f "$(which xclip)" ]]
then
  echo "Please install xclip."
  exit 1
fi

# Check for user inputs
if [[ $1 == "list" \
  || $1 == "-l" \
  || $1 == "--list" ]]
then
  echo "The following charfiles are installed:"
  ls $CHARDIR/charfiles
  exit 0
elif [[ $1 == "help" \
  || $1 == "-h" \
  || $1 == "--help" \
  || $# -ne 1 ]]
then
  cat /usr/share/doc/charsel/README.md
  exit 0
fi

# Define charfile path
CHARFILE=$CHARDIR/charfiles/$1

# Check if given charfile exists
if [[ ! -f $CHARFILE ]]
then
  echo "Please enter a valid charfile."
  charsel list
  exit 1
fi

# Define length of shortcode
LENGTH=$(cat $CHARFILE \
  | cut -f 1 -d ',' -s \
  | wc -L \
  | cut -b 1)

clear

# Main program
while true
do
  # Format output
  echo "*---------*---------------*"
  echo "| CHARSEL |" $1
  echo "*---------*---------------*"
  echo ""

  cat $CHARFILE \
    | sed -e '/^[ \t]*#/d' \
    | grep -A 100 - \
    | tail -n +2 \
    | column -t -N input,output --output-separator ' | ' --separator ','

  echo ""
  echo "*-------------------------*"
  echo "| previous shorcode:" $INPUT
  echo "| previous output:  " $OUTPUT
  echo "*-------------------------*"

  # User input
  read -p "| input shortcode:   " -N $LENGTH INPUT

  # This can definately be simplifed, but it works fine
  # Finds line number of shortcode
  LINENUMBER=$(cut -f 1 -d ',' -s $CHARFILE \
    | grep -wn $INPUT \
    | cut -d : -f 1)

  # Outputs charachter selected above
  OUTPUT=$(cut -f 2 -d ',' -s $CHARFILE \
    | head -$LINENUMBER \
    | tail +$LINENUMBER)

  # Check to see if the shortcode actually exists
  if [[ $(cut -f 1 -d ',' -s $CHARFILE \
    | grep -wnc $INPUT) == "0" ]]
  then
    OUTPUT=""
  fi

  # Copy output to clipboard
  echo $OUTPUT \
    | xclip -selection clipboard

  clear

done