#!/bin/bash
# @author 6543
# @version 0.1
# @date 2019-02-07

## Options/Parameter
# [$1]: <path to movie folder>

{ #set enviroemnt
  readonly TRUE=1      #like <stdbool.h>
  readonly FALSE=0     #like <stdbool.h>
  readonly TTSYNC_EXIST=0       #file exist local
  readonly TTSYNC_BACKUP=1      #file exist local - backup exist
  readonly TTSYNC_REMOTE=2      #file exists remote - not used jet
  readonly TTSYNC_DEL=3         #local file deleted
  readonly globalconf="/etc/tt/global"
}

{ #get options & args
  readonly mode=$(echo $1 | tr -d '-')
  moviedir="$1"
  [ -z "$moviedir" ] && [ -f "$globalconf" ] && {					# if (no argument) and (globalconf exist)
    if [ -z "$(grep "moviedir=" "$globalconf" )" ]; then			# and (moviedir is NOT in globalconf)
      echo 'neither "movie folder" is set in global config nor given as argument'
      exit 2
    else															# and (moviedir is in globalconf)
      moviedir="$(grep "moviedir=" "$globalconf" | cut -d '=' -f 2)"
    fi
  }
  [ -d "$moviedir" ] || { echo "moviedir \"$moviedir\" do not exist"; exit 3; } # check moviedir
  moviedir=""$(echo $moviedir | sed 's|/$||g')""
  [ -z "$moviedir" ] && exit 255 #catch case moviedir="/"
  readonly DATE=$(date '+%Y-%m-%d')
}

{ #db
  dbname="tt_test"
  dbhost="localhost"
  dbuser="root"
  dbpwd=""
}

function help() {
  #help menue
  echo "$0 is part of the TerabyteTerminator Project"
  echo ""
  echo "update-file-state [moviedir]"
  echo "  moviedir: Is optional if it is already in the global config"

  exit 0
}
[ "$mode" == "help" ] && help

###########################
## Programm Haupt Ablauf ##
###########################
function main() {
  #cd to moviedir
  cd "$moviedir"

  #clean DB from old stuff
  {
    db_query "DELETE From File WHERE Size=0 OR MD5="" OR MD5 IS NULL;"
  }

  #erselle zwei dateilisten
  list_tmp=$(mktemp -d)
  db_query "SELECT CONCAT('$moviedir/', Folder, '/', Name) FROM File WHERE TTSync=$TTSYNC_EXIST OR TTSync=$TTSYNC_BACKUP;" > "$list_tmp/indb"
  find "$moviedir" -type f > "$list_tmp/exist"

  #find new files
  grep -vf "$list_tmp/indb" "$list_tmp/exist" > "$list_tmp/new"

  #all IDs wich an old check date:
  db_query "SELECT ID FROM File Where TTCheck < '$DATE' OR TTCheck IS NULL;" | while read line; do
    #for each ID with an old check date ...
    ID=$line
    TTSync=$(db_query "SELECT TTSync FROM File WHERE ID=$ID;")
    FILE=$(db_query "SELECT CONCAT('$moviedir/', Folder, '/', Name) FROM File WHERE ID=$ID;")
    if [ -f "$FILE"]; then
      SIZE=$(db_query "SELECT Size FROM File WHERE ID=$ID;")
      SIZE_new="$(file_size "$FILE")"
       [ "$SIZE" != "$SIZE_new" ] && {
        echo "FILE CHANGE: $FILE"
         if [ "0" ==  "$SIZE_new" ]; then
             #file exist but empty
             #rm "$FILE" <- secure? 2check
             db_query "UPDATE File SET TTSync=$TTSYNC_DEL,TTCheck=$DATE WHERE ID=$ID;"
          else
        #recalc md5 ... + check
        #update DB
        MD5_new=$(md5sum "$FILE" | cut -c -32)
        MD5=$(db_query "SELECT MD5 FROM File WHERE ID=$ID;")
 
            if [ "$MD5" == "$MD5_new" ]; then
                 db_query "UPDATE File SET Size=$SIZE_new,TTCheck=$DATE WHERE ID=$ID;"
            else
                 #new file/file changed!
                 db_query "UPDATE File SET TTSync=$TTSYNC_DEL,TTCheck=$DATE WHERE ID=$ID;"
                 file_add "$(db_query "SELECT CONCAT(Folder, '/', Name) FROM File WHERE ID=$ID;")"
           fi

         fi
      }
else
 # file dont exist
db_query "UPDATE File SET TTSync=$TTSYNC_DEL,TTCheck=$DATE WHERE ID=$ID;"
fi

  done

#add new files ....
cat "$list_tmp/new" | while read line; do
  file_add "$line"
done


  rm -r "$list_tmp/"

}

###########################
## help functions #########
###########################

##check & prepair args
[ -z "$moviedir" ] && [ -f "$globalconf" ] && {					# if (no argument) and (globalconf exist)
  if [ -z "$(grep "moviedir=" "$globalconf" )" ]; then			# and (moviedir is NOT in globalconf)
    echo 'neither "movie folder" is set in global config nor given as argument'
    exit 2
  else															# and (moviedir is in globalconf)
    moviedir="$(grep "moviedir=" "$globalconf" | cut -d '=' -f 2)"
  fi
}
[ -d "$moviedir" ] || { echo "moviedir \"$moviedir\" do not exist"; exit 3; } # check moviedir
moviedir=""$(echo $moviedir | sed 's|/$||g')""
[ -z "$moviedir" ] && exit 255 #catch case moviedir="/"


# file_size <path> -> (du -b)/1024  [Kb]
function file_size() {
  if [ -f "$1" ]; then
    echo $(($(du -b "$1" | cut -f 1)/1024))
  else
    echo 0
  fi
}

function file_add() {
 echo "dumy func file_add [rel. path]
#chek if path still esist chek usw...
#chek if size ->md5 exist -> not new MV !!!
}


# db_query <query> -> result
function db_query() {
  local args="-sN"  #no headers, no grid
  args+=" -h$dbhost"
  args+=" -u$dbuser"
  [ -n "$dbpwd" ] && args+=" -p$dbpwd"
  args+=" $dbname"
  echo $@ | mysql $args
}

# db_F-ID_getPath <F-ID> -> <Path>
function db_id_getPath() {
  db_query "SELECT CONCAT('$moviedir/', Folder, '/', Name) FROM File WHERE ID=$1;"
}



main #aufruf der main function (eig. programmstart)