#!/bin/bash

{ #this curly brace at start and end of script prevents issues when this script edits itself. See: https://stackoverflow.com/a/19430939
DIRECTORY="$(readlink -f "$(dirname "$0")")"

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

#for the will_reinstall() and list_intersect() functions
source "${DIRECTORY}/api" || error "failed to source ${DIRECTORY}/api"

#NOTE TO SELF BOTSPOT: REMOVE THE FASTMODE VARIABLE SETTING!!!
#fastmode=1

{ # Determine if checking for updates today
lastupdatecheck="$(cat "${DIRECTORY}/data/last-update-check")"
if [ -z $lastupdatecheck ];then
  echo "Warning: ${DIRECTORY}/data/last-update-check does not exist!"
  lastupdatecheck=0
fi

updateinterval="$(cat "${DIRECTORY}/data/settings/Check for updates")"

nocheck=0
#allowed values: Always, Daily, Weekly, Never
if [ "$updateinterval" == 'Never' ];then
  nocheck=1
  echo ''
elif [ "$updateinterval" == 'Daily' ];then
  #if updates checked today, don't check
  if [ "$(date +%j)" == "$lastupdatecheck" ];then
    nocheck=1
  fi
elif [ "$updateinterval" == 'Weekly' ];then
  #if updates checked less than 7 days ago, don't check
  if [ "$(date +%j)" -le "$((lastupdatecheck + 7))" ];then
    nocheck=1
  fi
elif [ "$updateinterval" == 'Always' ];then
  echo "Checking for updates now..."
elif [ -z "$updateinterval" ];then
  echo "Something isn"\'" right. Does ${DIRECTORY}/data/settings/Check for updates exist?"
else
  echo "Warning: Unrecognized update interval!"
fi

#fix for new years day
if [ "$lastupdatecheck" -gt "$(date +%j)" ];then
  nocheck=0
fi

#forcibly check if fastmode variable is 1
if [ "$fastmode" == 1 ];then
  nocheck=0
fi

#hidden flag: if $1 is 'onboot', then check for updates only for those apps that are installed.
onboot="$1"
if [ "$onboot" == 'onboot' ] || [ "$onboot" == 'installedonly' ];then
  onboot='onboot'
  
  #make sure user installed some apps first. If none installed, then Pi-Apps may be unwanted/unused.
  if [ "$(ls "${DIRECTORY}/data/status" | wc -l)" == 0 ];then
    echo "No apps have been installed yet, so exiting now."
    exit 0
  fi
  
  sleep 10 #wait 10 seconds, this is so the system will have booted all the way for an internet connection
fi

if [ $nocheck == 1 ];then
  echo "Won"\'"t check for updates today, because of the update interval is set to $updateinterval in Settings.
To forcibly check for updates now, press any key within the next 20 seconds."
  read -n 1 -t 20 || exit 0
  echo ''
fi

#write today's date to file. Format is "number of days since jan 1"
echo "$(date +%j)" > "${DIRECTORY}/data/last-update-check"
}

#if fastmode is 1, then rely on previously gathered updatable app information. This information is located in data/update-status.
if [ "$fastmode" == 1 ];then
  updatable="$("${DIRECTORY}/manage" check-all nogenerate 2>/dev/null)"
else
  #otherwise, re-download apps to update folder and hash them all to determine which apps can be updated
  updatable="$("${DIRECTORY}/manage" check-all)"
fi
[ $? -ne 0 ] && error "check-all failed! Full output: $updatable"

#shorten to last line
if [ "$updatable" == '.' ];then
  updatable=''
fi

echo "updatable: $updatable"

#if check-all succeeded to download the repo to the update folder
if [ ! -d "${DIRECTORY}/update" ];then
  error "${DIRECTORY}/update does not exist. Most likely there is no Internet connection."
fi

#mainfiles="$(echo -e "$(ls -Rp "${DIRECTORY}/update/pi-apps")\n$(ls -Rp "${DIRECTORY}")" | grep -v '/' | sort | uniq | tr '\n' '|')"

#list all files in update folder
cd "${DIRECTORY}/update/pi-apps" || error "Failed to enter update directory!"
updatefiles="$(find . -type f | cut -c 3- | grep -v '.git/' | grep -v 'apps/' | grep -v 'data/')"

#list all files in main folder
cd "${DIRECTORY}"
localfiles="$(find . -type f | cut -c 3- | grep -v '.git/' | grep -v 'apps/' | grep -v 'data/' | grep -v 'logs/' | grep -v 'xlunch/')"

mergedfiles="$(echo -e "${localfiles}\n${updatefiles}" | sort | uniq)"

#exclude files mentioned in data/update-exclusion file
IFS=$'\n'                                   #exclude commented lines
for file in $(cat "${DIRECTORY}/data/update-exclusion" | grep "^[^#;]")
do
  mergedfiles="$(echo "$mergedfiles" | grep -v "$file")"
  echo "Excluding '$file' from the mergedlist."
done

mergedfiles="$(echo "$mergedfiles")"
for file in $mergedfiles
do
  newhash=$(cat "${DIRECTORY}/update/pi-apps/${file}" 2>/dev/null | sha1sum | awk '{print $1}' | sha1sum | awk '{print $1}')
  oldhash=$(cat "${DIRECTORY}/${file}" 2>/dev/null | sha1sum | awk '{print $1}' | sha1sum | awk '{print $1}')
  #echo -e "newhash: $newhash\noldhash: $oldhash"
  
  if [ "$newhash" == "$oldhash" ];then
    true
    #echo -e "${file} is identical\e[90m to the online version. Nothing to do!\e[39m"
  else
    if [ ! -f "${DIRECTORY}/${file}" ];then
      echo -e "\e[97m${file} does not exist locally.\e[39m Adding to updatable list."
      #in this case, add to updatable list
      mainupdate="${mainupdate}
${file}"
    elif [ ! -f "${DIRECTORY}/update/pi-apps/${file}" ];then
      echo -e "\e[97m${file} only exists locally.\e[39m Will not add to updatable list."
      #in this case, do not add to updatable list
    else
      echo -e "\e[97m${file} exists in both locations, but files do not match.\e[39m Adding to updatable list."
      #in this case, add to updatable list
      mainupdate="${mainupdate}
${file}"
    fi
    
  fi
done
IFS="$PREIFS"
#remove initial newline character
mainupdate="${mainupdate:1}"

LIST=''

PREIFS="$IFS"
IFS=$'\n'
for app in $updatable #repeat for every updatable app
do
  LIST="${LIST}TRUE
${DIRECTORY}/update/pi-apps/apps/${app}/icon-24.png
$app "\("$([ "$(cat "${DIRECTORY}/data/update-status/${app}")" == 'new' ] && echo 'new ')app$(will_reinstall "$app" && echo ', <b>will be reinstalled</b>')"\)"
$app
"
done
for file in $mainupdate #repeat for every updatable file
do
  #determine mimetype of updatable file to display an informative icon in the list
  if [ "$(file -b --mime-type "${DIRECTORY}/${file}")" == 'text/x-shellscript' ];then
    #if updatable file in question is a shell script, then display shellscript icon.
    mimeicon="${DIRECTORY}/icons/shellscript.png"
    mimetype='script'
  elif [[ "${DIRECTORY}/${file}" == *.png ]];then
    mimeicon="${DIRECTORY}/icons/image.png"
    mimetype='image'
  else
    #otherwise display txt icon.
    mimeicon="${DIRECTORY}/icons/txt.png"
    mimetype='file'
  fi
  
  LIST="${LIST}TRUE
${mimeicon}
$file "\("$mimetype"\)"
${file}
"
done
IFS="$PREIFS"

if [ -z "$LIST" ];then
  echo -e '\e[92mNothing to update. Nothing to do!\e[39m'
  exit 0
fi
LIST="${LIST::-1}" #remove last newline
#echo "List: ${LIST}EOL"

screen_width="$(xrandr | grep "HDMI-1" | awk '{print $4}' | tr 'x+' ' ' | awk '{print $1}')"
screen_height="$(xrandr | grep "HDMI-1" | awk '{print $4}' | tr 'x+' ' ' | awk '{print $2}')"

#display notification in lower-right, only if fastmode variable is not 1
if [ "$fastmode" != 1 ];then
  output="$(yad --form --text='Pi-Apps updates available.' --separator='\n' \
    --on-top --skip-taskbar --undecorated --close-on-unfocus \
    --geometry=260+$((screen_width-262))+$((screen_height-150)) \
    --image="${DIRECTORY}/icons/logo-64.png" \
    --field='Never show again':CHK FALSE \
    --button="Details!${DIRECTORY}/icons/info.png":0 --button="Close!${DIRECTORY}/icons/exit.png":2)"
  button=$?
  
  if [ $button != 0 ];then
    if [ "$(echo "$output" | grep . )" == TRUE ];then
      #User checked the 'Never show again' box, so ask to change update interval
      curval="$(cat "${DIRECTORY}/data/settings/Check for updates")"
      [ -z "$curval" ] && curval="$(cat "${DIRECTORY}/etc/setting-params/Check for updates" | grep -v '#' | head -n1)"
      
      params="$(cat "${DIRECTORY}/etc/setting-params/Check for updates" | grep -v '#')"
      params="$(echo "$params" | grep -x "$curval" | tr '\n' '!')!$(echo "$params" | grep -vx "$curval" | tr '\n' '!')"
      params="$(echo -e "$params" | sed 's/!!/!/g' | sed 's/!$//g' | sed 's/^!//g')"
      
      echo "Params: '$params'"
      
      output="$(yad --center --title='Change Pi-Apps update interval' --width=440 \
        --form --separator='\n' --window-icon="${DIRECTORY}/icons/logo.png" \
        --text="You just requested for Pi-Apps to <i>never check for updates again</i>."$'\n'"Are you sure? If so, change the update interval to "\""<b>Never</b>"\"" below." \
        --field='Update interval: ':CB "$params" \
        --button=Cancel!"${DIRECTORY}/icons/exit.png":1 \
        --button=Save!"${DIRECTORY}/icons/check.png":0)"
      button=$?
      
      output="$(echo "$output" | grep .)"
      if [ $button == 0 ];then #save button clicked
        echo "$output" > "${DIRECTORY}/data/settings/Check for updates"
      fi
    fi
    #since Details was not clicked, exit now
    exit 0
  fi
fi

#If user clicks 'Details', then display a list of everything updatable
output="$(echo -e "$LIST" | yad --center --title='Pi-Apps' \
  --window-icon="${DIRECTORY}/icons/logo.png" --width=310 --height=300 \
  --list --checklist --separator='\n' --print-column=4 --no-headers \
  --text="Updates available:"$'\n'"Uncheck an item to skip updating it." \
  --column=:CHK --column=:IMG --column=Name --column=ID:HD \
  --button='Later'!"${DIRECTORY}/icons/exit.png"!"Remind me later":1 \
  --button='Update now'!"${DIRECTORY}/icons/download.png":0)" || exit 0

PREIFS="$IFS"
IFS=$'\n'

#remove empty newlines from output
output="$(echo "$output" | grep .)"

#limit list of update files to those selected by user.
#Edge case: if a file and app are named the same, they will appear in both lists if either one was selected.
updatable="$(echo "$updatable" | list_intersect "$output")"
#echo -e "\nWill update these apps:\n$updatable EOAPPS"
mainupdate="$(echo "$mainupdate" | list_intersect "$output")"
#echo "Will update these files:\n$mainupdate EOFILES"

for file in $mainupdate
do
  mkdir -p "$(dirname "${DIRECTORY}/${file}")"
  
  #copy new version to apps/
  cp -f "${DIRECTORY}/update/pi-apps/${file}" "${DIRECTORY}/${file}" || echo -e "\e[91mFailed to copy ${DIRECTORY}/update/pi-apps/${file}\e[39m!"
  
  echo -e "\e[92m${file} file was copied successfully.\e[39m"
done
IFS="$PREIFS"

if [ ! -z "$updatable" ];then
  "${DIRECTORY}/etc/terminal-run" '
    DIRECTORY="'"$DIRECTORY"'"
    updatable="'"$updatable"'"
    trap "sleep 10" EXIT
    PREIFS="$IFS"
    IFS=$'\''\n'\''
    for i in $updatable
    do
      "${DIRECTORY}/manage" update "$i" nofetch
    done
    IFS="$PREIFS"
    echo -e "\e[92mAll updates complete. Closing in 10 seconds.\e[39m"
  ' "Updating $(echo "$updatable" | wc -l) app$([ $(echo "$updatable" | wc -l) != 1 ] && echo s)..."
fi
#.git folder
#delete .git folder, then copy the new one
rm -rf "${DIRECTORY}/.git" || sudo rm -rf "${DIRECTORY}/.git" || error "Failed to delete old ${DIRECTORY}/.git folder!"
cp -a "${DIRECTORY}/update/pi-apps/.git" "${DIRECTORY}" || error "Failed to copy new .git folder!"

echo -e "\e[92mPi-Apps updates complete.\e[39m"

yad --form --text='Pi-Apps updates complete.' \
  --on-top --skip-taskbar --undecorated --close-on-unfocus \
  --geometry=260+$((screen_width-262))+$((screen_height-150)) \
  --image="${DIRECTORY}/icons/logo-64.png" \
  --button="Close!${DIRECTORY}/icons/exit.png":1

exit 0
} #this curly brace at start and end of script prevents issues when this script updates itself. See: https://stackoverflow.com/a/19430939