#!/bin/bash

# Configurations etc.
COOPCLOUD_MAX_LOAD_SIZE=1024
export COOPCLOUD_ENTRYPOINT_VERSION=0.1.0

# Functions
logn () {
    echo -n "[COOP]["$(date +%FT%T%Z)"]" "$@"
}

log () {
    logn "$@"
    echo " "
}

DOCS=$(cat <<-__DOCS__

EOF
Loading files into environment:
  Max size is 1 kbyte, files larger than that will not be loaded.

  Environment variables in the format COOPCLOUD_LOAD_<ENVIRONMENTNAME>=<FILENAME>; the contents of
  <FILENAME> are loaded into <ENVIRONMENTNAME>

Startup Scripts:
  Extra scripts included with the

Entrypoint:
  The default entrypoint is communicated from the parent environment with COOPCLOUD_ENTRYPOINT; we expect
  COOPCLOUD_ENTRYPOINT_ORIGINAL to be set also. If COOPCLOUD_ENTRYPOINT is being overriden for this execution,
  this provides a fall-back and also can communicate to the child environment that the entrypoint has been
  overriden.

__DOCS__
    )

cat <<-__TURT__
                               .-=++++==-:
                            .=+***+*******+=.
                           =****++%+:+*******-
                          =#****:-+-.********+:
                    .    .*****+.. .:*******+=.
                   =*-: .:****++=--=+*******=
                 =+*==+++-=#***++++++*******+=-
                 .+*++****==*****+++++++=++=++:
   .-++++++-.     :++******+=++**********++*+.
  =**********:   -=-+++******-+++++******++:
 =#**++++****+  -===:=+++***-+%%#*+++++==+*++-.
.++*****-=****..====:*======**+*#%%%%%%#=******+=
 =++***#--#**+::-==-+@=**#*+%%#**++*+**+-*******=
 .=+++==-****=:-:==#@++%%%#+%##%%#%*=##*.:-----:
  .-===+*****=:-:-%#+*%#%%*=#%%%##%=#%%-
    -++++****+:-:=+=++##*+*#++**#%=+%%=
      :=+++***=.=*****-=##%%%#**+-=*+-:
         :-==+-+*******-*#####%%++*+=+#=
              =********=-+++++=--==+***#-
             .********+:.:::...-++******-
            -********=          :=+++***=-
            .-**+**+:             :===-:.
              :. .=.
                    [HACK THE PLANET]
__TURT__

# echo that we're running the show
log "#### Coop Cloud Entrypoint $COOPCLOUD_ENTRYPOINT_VERSION ###"

# load specified files into environment variables
while read ENVIRON_VAR; do
    file=${!ENVIRON_VAR}
    logn "Loading $ENVIRON_VAR ($file)"
    if test -e "$file"; then
        # file exists!
        fsize=$(wc -c < "$file")
        if [ $fsize -lt $COOPCLOUD_MAX_LOAD_SIZE ]; then
            target=$(echo $ENVIRON_VAR | cut -d_ -f3-)
            val="$(cat $file)"
            eval export $target=\"$val\"
            echo " -> $target."
        else
            echo " File too big ($fsize bytes > $COOPCLOUD_MAX_LOAD_SIZE)."
        fi
    else
        echo " File Not Found."
    fi
done < <(printenv |grep ^COOPCLOUD_LOAD_ | cut -d= -f1)
### fixme we should support some sort of startup script / 1st time script thing here

# warn about overridden entrypoint
if [ "$COOPCLOUD_ENTRYPOINT" != "$COOPCLOUD_ENTRYPOINT_ORIGINAL" ]; then
    log "#### Warning: Entrypoint apparently overriden to $COOPCLOUD_ENTRYPOINT ####"
fi

# call the specified entrypoint (if possible)
if [ ! -x "$COOPCLOUD_ENTRYPOINT" ]; then
    log "$COOPCLOUD_ENTRYPOINT cannot be executed."
    if [ -x "$COOPCLOUD_ENTRYPOINT_ORIGINAL" ]; then
        log "Launching original entrypoint ..."
        echo ""
        exec $COOPCLOUD_ENTRYPOINT_ORIGINAL
    else
        log "$COOPCLOUD_ENTRYPOINT_ORIGINAL cannot be executed. Giving up."
        exit -1
    fi
fi
log "Launching entrypoint ..."
exec $COOPCLOUD_ENTRYPOINT "$@"