#!/bin/sh

#
#  Emulate 'tx pull --use-git-timestamps' by automating 'wlc download'
#  to download updated translations to the local workspace.
#  This is NOT the same as 'wlc pull'
#
#  Usage: wlpull [component [language]]
#
#  By the I2P project
#  Public Domain
#

# project
# leave blank to get from .weblate
P=""
# component(s)
# leave blank to get from .weblate
# must specify here if multiple components
C="i2ptunnel proxy core router routerconsole welcome countries i2psnark susidns desktopgui susimail debconf i2prouter-script getopt streaming manpages eepsite readme"
# languages
# leave blank to get from .weblate
L=""

TMP=/var/tmp/wlpull$$

if [ "$1" = "-h" -o "$1" = "-?" -o "$1" = "help" -o "$1" = "-help" -o "$1" = "--help" -o "$#" -gt 2 ]
then
	echo "Usage: $0 [component [language]]"
	echo
	echo "Note that language must be the Weblate (language) identifier, not the ISO (language_code) identifier, which is sometimes different."

	exit 1
fi

wlc help 2> /dev/null
if [ $? -ne 2 ]
then
	echo 'ERROR: wlc must be installed'
	exit 1
fi


if [ ! -f .weblate -o ! -d .git ]
then
	echo 'ERROR: Must run from base git project directory with a .weblate file'
	exit 1
fi

X=`grep 'translation =' .weblate | cut -c14-`
if [ "$X" = "" ]
then
	echo 'ERROR: Must have a translation = project or translation = project/component line in the .weblate file'
	exit 1
fi

# command line overrides
if [ ! -z "$1" ]
then
	C="$1"
fi
if [ ! -z "$2" ]
then
	L="$2"
fi

if [ -z "$P" ]
then
	P=`echo $X | cut -d '/' -f 1`
fi

if [ -z "$C" ]
then
	C=`echo $X | cut -d '/' -f 2`
	if [ -z "$C" ]
	then
		echo "ERROR: Must have a project/component line in the .weblate file, or specify here in $0"
		exit 1
	fi
fi

echo "Project:    $P"
echo "Components: $C"
echo "Languages:  ${L:-all}"
echo

RC=0

for CX in $C
do
	# full component path
        W="$P/$CX"
	echo "Checking for updated translations in $W"

	wlc list-translations "$W" > "$TMP"
	if [ "$?" -ne 0 ]
	then
		echo "ERROR: wlc list-translations failed for $W - bad component name?"
		rm -f $TMP
		exit 1
	fi
	# extract params for each language

	# files
	# skip filename for english
	FILES=`grep '^filename: ' "$TMP" | cut -c 11- | tail -n +2`
	FILES=`echo "$FILES" | tr '\n' ' '`
	if [ -z "$FILES" ]
	then
		echo "ERROR: No files found for $W"
		exit 1
	fi

	# languages
	# skip english
	# NOT language_code, must be language which is the weblate identifier
	#LANGS=`grep '^language_code: ' "$TMP" | cut -c 16- | tail -n +2`
	LANGS=`grep '^language: ' "$TMP" | cut -c 11- | tail -n +2`
	LANGS=`echo "$LANGS" | tr '\n' ' '`
	if [ -z "$LANGS" ]
	then
		echo "ERROR: No languages found for $W"
		exit 1
	fi

	# timestamp
	# skip english
        # convert spaces to _, we will undo later
	# strip ms and TZ
	TIMES=`grep '^last_change: ' "$TMP" | cut -c 14- | tail -n +2 | tr ' ' '_' | cut -d '.' -f 1`
	TIMES=`echo "$TIMES" | tr '\n' ' '`
	if [ -z "$TIMES" ]
	then
		echo "ERROR: No timestamps found for $W"
		exit 1
	fi

	# percents
	# skip english
	# strip ms and TZ
	PERCS=`grep '^translated_percent: ' "$TMP" | cut -c 21- | tail -n +2`
	PERCS=`echo "$PERCS" | tr '\n' ' '`
	if [ -z "$PERCS" ]
	then
		echo "ERROR: No percentages found for $W"
		exit 1
	fi

	rm -f "$TMP"
	# debug
	#echo
	#echo "Files:"
	#echo "$FILES"
	echo
	echo "Found Weblate Languages:"
	echo "$LANGS"
	echo
	#echo "Timestamps:"
	#echo "$TIMES"
	#echo
	#echo "Percentages:"
	#echo "$PERCS"
	#echo

	i=0
	for LANG in $LANGS
	do
		i=$((i+1))
		if [ ! -z "$L" ]
		then
			# if lang specified on command line, skip if this isn't it
			if [ "$L" != "$LANG" ]
			then
				continue
			fi
		fi

		PERC=`echo "$PERCS" | cut -d ' ' -f $i`
		FILE=`echo "$FILES" | cut -d ' ' -f $i`
		if [ ! -f "$FILE" -a -z "$L" ]
		then
			echo "SKIPPING $LANG ${PERC}% complete - no local file $FILE"
			echo "Force download with $0 $CX $LANG"
			continue
		fi
		# convert remote timestamp to epoch time
		TIME=`echo "$TIMES" | cut -d ' ' -f $i | tr '_' ' '`
		TSR=`date -u -d "$TIME" +%s`
		if [ "$?" -ne 0 ]
		then
			echo "ERROR: Cannot get weblate date for $FILE"
			exit 1
		fi
		if [ -f "$FILE" ]
		then
			# get local checkin timestamp
			TSL=`git log -1 --format=%at "$FILE"`
			if [ "$?" -ne 0 -a -z "$L" ]
			then
				echo "ERROR: Cannot get git commit date for $FILE"
				exit 1
			fi
		else
			TSL=0
		fi
		if [ -z "$TSL" ]
		then
			echo "WARNING: No commits for $FILE - forcing download, don't forget to git add"
			TSL=0
		fi
		# format for display
		TSLC=`date -u -d @$TSL`
		TSRC=`date -u -d @$TSR`
		if [ "$TSR" -le "$TSL" ]
		then
			echo "SKIPPING $LANG - Weblate $TSRC older than local file $FILE committed $TSLC"
			continue
		fi
		echo "DOWNLOADING $LANG - Weblate $TSRC newer than local file $FILE committed $TSLC"
		wlc download $W/$LANG > "$TMP"
		if [ "$?" -ne 0 ]
		then
			echo "FAILED to download file for $W/$LANG"
			rm -f "$TMP"
			RC=1
			continue
		fi
		if [ -f "$FILE" ]
		then
			diff -q "$TMP" "$FILE" > /dev/null
			if [ "$?" -eq 0 ]
			then
				# Weblate timestamp newer after initial import
				echo "NO CHANGES in $W/$LANG for $FILE"
				rm -f "$TMP"
				continue
			fi
		fi
		mv "$TMP" "$FILE"
		if [ "$?" -ne 0 ]
		then
			echo "FAILED to copy file for $W/$LANG to $FILE"
			rm -f "$TMP"
			RC=1
			continue
		fi
		echo "DOWNLOADED language $LANG ${PERC}% complete to $FILE"
	done
done

exit $RC