#!/bin/bash
DIRECTORY="$(readlink -f "$(dirname "$0")")"

function error {
  echo -e "\e[91m$1\e[39m"
  exit 1
}

[ -z "$(yad --help)" ] && error "YAD needs to be installed to run pi-apps."

#check for updates in background
"${DIRECTORY}/updater" 1>/dev/null  &

mkdir -p "${DIRECTORY}/data/installed-packages" "${DIRECTORY}/data/status"

#Variable 1 is used to view the details of the specefied app
if [ ! -z "$1" ];then
  output="$1"
fi

while true;do

  APPS="$(echo "$(ls "${DIRECTORY}/apps")" | grep -v 'template')"
  #APPS="$(echo "$(ls "${DIRECTORY}/apps")")"
  #echo -e "$APPS\n"


  APPS="$(echo "$APPS" | tr '\n' '|')"

  PREIFS="$IFS"
  IFS="|"
  LIST=''
  for i in $APPS
  do
    
    LIST="$LIST$(echo "${DIRECTORY}/icons/$(cat "${DIRECTORY}/data/status/${i}" || echo "none").png")
${DIRECTORY}/apps/${i}/icon-24.png
$i
"\("$(cat "${DIRECTORY}/data/status/${i}" || echo "uninstalled")"\)" $(echo "$(cat "${DIRECTORY}/apps/${i}/description" || echo "Description unavailable")" | head -n1)
"
  done
  IFS="$PREIFS"
  LIST="$(echo -e "$LIST")"
  #echo "$LIST"
  
  #if output is not empty then assume button pressed was Details
  button=0
  
  while [ -z "$output" ]
  do
    
    output="$(echo -e "$LIST" | yad --center --title='Pi-Apps' --width=310 --height=300 --no-headers \
      --list --separator='\n' --window-icon="${DIRECTORY}/icons/logo.png" \
      --column=:IMG --column=:IMG --column=Name --column=tip:HD --print-column=3 --tooltip-column=4 \
      --button=Install!"${DIRECTORY}/icons/install.png":4 \
      --button=Uninstall!"${DIRECTORY}/icons/uninstall.png":2 \
      --button=Details!"${DIRECTORY}/icons/info.png"!'View more about the selected software:0' \
      2>/dev/null)"

    button=$? #get exit code to determine which button was pressed
    echo "Button: ${button}"
    if [ $button -eq 252 ];then #if window manager x was pressed
      exit 0
    fi

    echo "Output: ${output}EOO"
  
  if [ -z "$output" ];then
    echo "output variable empty!"
    yad --center --title='Pi-Apps' --width=310 \
      --window-icon="${DIRECTORY}/icons/logo.png" \
      --text="Mind reading is not supported.
(You didn"\'"t select an App)" \
      --button=OK:0
  fi
  done
  
  case $button in

    1)
      echo "User exited."
      exit 0
      ;;
    0)
      echo "Details"
      
      info="$(echo -n "Current status: "
          cat "${DIRECTORY}/data/status/${output}" || echo 'Uninstalled'
        
        if [ ! -z "$(cat "${DIRECTORY}/data/installed-packages/${output}")" ];then
          echo -n "This app installed these packages: "
          cat "${DIRECTORY}/data/installed-packages/${output}" | tr '\n' ' '
        fi
      )"
      
      text="$(echo "$(cat "${DIRECTORY}/apps/${output}/description" || echo "Description unavailable")" | head -n1)
$info
Website: $(cat "${DIRECTORY}/apps/${output}/website" || echo "unavailable")
$(echo "$(cat "${DIRECTORY}/apps/${output}/description" || echo "Description unavailable")" | grep -v "$(echo "$(cat "${DIRECTORY}/apps/${output}/description" || echo "Description unavailable")" | head -n1)")"
      
      #if already installed then no need to provide install button. And vice versa.
      whichbutton="$(
      if [ -f "${DIRECTORY}/data/status/${output}" ];then
        #Taking a chance here. If status file is nonexistent, assume uninstalled.
        echo "--button=Install!${DIRECTORY}/icons/install.png:4"
      elif [ "$(cat "${DIRECTORY}/data/status/${output}")" == 'installed' ];then
        echo "--button=Uninstall!${DIRECTORY}/icons/uninstall.png:2"
      elif [ "$(cat "${DIRECTORY}/data/status/${output}")" == 'uninstalled' ];then
        echo "--button=Install!${DIRECTORY}/icons/install.png:4"
      else
        #if status is corrupted or unknown, then show both buttons
        echo "--button=Uninstall!${DIRECTORY}/icons/uninstall.png:2 --button=Install!${DIRECTORY}/icons/install.png:4"
      fi
      )"
      
      echo "$text" | yad --text-info --fontname=12 --wrap --show-uri \
        --image="${DIRECTORY}/apps/${output}/icon-64.png" --image-on-top \
        --title="Details of ${output}" --window-icon="${DIRECTORY}/icons/logo.png" --center --width=700 --height=300 \
        $whichbutton \
        --button=''!"${DIRECTORY}/icons/up.png"!'View previous App':6 \
        --button=''!"${DIRECTORY}/icons/down.png"!'View next App':8 \
        --button=Back!"${DIRECTORY}/icons/back.png":0
      button=$? #get exit code to determine which button was pressed
      echo "Button: ${button}"
      
      if [ $button == 0 ];then
        echo 'Back' #do nothing, as user requested to go back
        #clear app var
        output=''
      elif [ $button == 4 ];then
        #install
        "${DIRECTORY}/manage" install "$output"
      elif [ $button == 2 ];then
        #uninstall
        "${DIRECTORY}/manage" uninstall "$output"
      elif [ $button == 6 ];then
        echo 'previous app'
        
        #convert $output into number, then subtract 1 from it
        
        lsoutput="$(echo "$(ls "${DIRECTORY}/apps")" | grep -v 'template')"
        
        number="$(echo "$lsoutput" | grep -nx "$output" | cut -f1 -d: )"
        
        lastline="$(echo "$lsoutput" | wc -l)"
        
        if [ $(($number - 1)) -lt '1' ];then
          newnumber=$lastline
        else
          newnumber=$(($number - 1))
        fi
        
        output="$(echo "$lsoutput" | sed -n "${newnumber}p")"
        
        echo "Line number was ${number}, but now is ${newnumber}. Name is ${output}."
        
      elif [ $button == 8 ];then
        echo 'next app'
        
        #convert $output into number, then add 1 to it
        
        lsoutput="$(echo "$(ls "${DIRECTORY}/apps")" | grep -v 'template')"
        
        number="$(echo "$lsoutput" | grep -nx "$output" | cut -f1 -d: )"
        
        echo "Line number was ${number}, but now is ${newnumber}. Name is ${output}."
        
        lastline="$(echo "$lsoutput" | wc -l)"
        
        if [ $(($number + 1)) -gt $lastline ];then
          newnumber=1
        else
          newnumber=$(($number + 1))
        fi
        
        output="$(echo "$lsoutput" | sed -n "${newnumber}p")"
        
        echo "Line number was ${number}, but now is ${newnumber}. Name is ${output}."
        
      else
        echo 'unknown button. Going back.'
        #clear output var to prompt main window to open next
        output=''
      fi
      
      ;;
    2)
      echo "Uninstall"
      "${DIRECTORY}/manage" uninstall "$output"
      
      #clear output var to prompt main window to open next
      output=''
      ;;
    4)
      echo "Install"
      "${DIRECTORY}/manage" install "$output"
      
      #clear output var to prompt main window to open next
      output=''
      ;;
    *)
    error "Unknown button: $button"
    ;;
  esac
done