#! /bin/sh

### LICENSE
# === This file is part of Calamares - <https://calamares.io> ===
#
#   SPDX-FileCopyrightText: 2019-2020 Adriaan de Groot <groot@kde.org>
#   SPDX-License-Identifier: BSD-2-Clause
#
#   This file is Free Software: you can redistribute it and/or modify
#   it under the terms of the 2-clause BSD License.
#
### END LICENSE

### USAGE
#
# Does the translation tag (from a previous txpush) exist?
# This assumes that the release host has also locally done
# a translations push, which works for the current development
# workflow .. but it could be improved by looking for one of
# the typical txpush log messages instead of the tag.
#
# Use --cleanup as an argument to clean things up.
#
# Normal use:
#   $ sh ci/txcheck.sh
# If there are differences, fix them and then clean up:
#   $ sh ci/txcheck.sh --cleanup
#
### END USAGE

# The files that are translated; should match the contents of .tx/config
TX_FILE_LIST="lang/calamares_en.ts lang/python.pot calamares.desktop"

### COMMAND ARGUMENTS
#
# We need to define tx_cleanup for the --cleanup argument, although it's
# normally used much later in the script.
tx_cleanup()
{
	# Cleanup artifacs of checking
	git worktree remove --force build-txcheck-head
	git worktree remove --force build-txcheck-prev
	git branch -D build-txcheck-head > /dev/null 2>&1
}

if test "x$1" = "x--cleanup" ; then
	tx_cleanup
	exit 0
fi
if test "x$1" = "x--help" ; then
	sed -e '1,/USAGE/d' -e '/END.USAGE/,$d' < "$0"
fi
test -z "$1" || { echo "! Usage: txcheck.sh [--cleanup]" ; exit 1 ; }


### FIND EXECUTABLES
#
#
XMLLINT=""
for _xmllint in xmllint
do
	$_xmllint --version > /dev/null 2>&1 && XMLLINT=$_xmllint
	test -n "$XMLLINT" && break
done

# Distinguish GNU date from BSD date
if date +%s -d "1 week ago" > /dev/null 2>&1 ; then
	last_week() { date +%s -d "1 week ago" ; }
else
	last_week() { date -v1w +%s; }
fi

# Distinguish GNU SHA executables from BSD ones
if which sha256sum > /dev/null 2>&1 ; then
	SHA256=sha256sum
else
	SHA256=sha256
fi

### CHECK WORKING DIRECTORY
#
#
if git describe translation > /dev/null 2>&1 ; then
	:
else
	echo "! No 'translation' tag exists for enforcing the string-freeze."
	exit 1
fi
# The tag exists, so now check that there's no unsaved changes
if test `git describe` = `git describe --dirty` ; then
	:
else
	# Don't want any local changes, since those won't be
	# reflected in the worktrees and we might miss a string change.
	echo "! There are local changes."
	exit 1
fi
# No unsaved changes; enforce a string freeze of one week
DATE_PREV=$( git log -1 translation --date=unix | sed -e '/^Date:/s+.*:++p' -e d )
DATE_HEAD=$( last_week )
test "$DATE_PREV" -le "$DATE_HEAD" || { echo "! Translation tag has not aged enough." ; git log -1 translation ; exit 1 ; }

# Tag is good, check that necessary files exist. The list of
# files is hard-coded, but should match what is in the Transifex config.
test -f ".tx/config" || { echo "! No Transifex configuration is present." ; exit 1 ; }
for f in $TX_FILE_LIST ; do
	test -f $f || { echo "! Translation file '$f' does not exist." ; exit 1 ; }
done

### COMPARE TRANSLATIONS
#
#

# The state of translations; assume that sha256 is enough
# to distinguish changed translations when we cat all the
# string sources together.
tx_sum()
{
	CURDIR=`pwd`
	WORKTREE_NAME="$1"
	WORKTREE_TAG="$2"

	git worktree add $WORKTREE_NAME $WORKTREE_TAG > /dev/null 2>&1 || { echo "! Could not create worktree." ; exit 1 ; }
	( cd $WORKTREE_NAME && sh "$CURDIR"/ci/txpush.sh --no-tx ) > /dev/null 2>&1 || { echo "! Could not re-create translations." ; exit 1 ; }

	# Remove linenumbers from .ts (XML) and .pot
	sed -i'' -e '/<location filename/d' "$WORKTREE_NAME/lang/calamares_en.ts"
	sed -i'' -e '/^#: src..*[0-9]$/d' $WORKTREE_NAME/lang/python.pot

	_SUM=$( cd $WORKTREE_NAME && cat $TX_FILE_LIST | $SHA256 )
	echo "$_SUM"
}

# Check from the translation tag as well
HEAD_SUM=`tx_sum build-txcheck-head ""` || { echo "$HEAD_SUM" ; exit 1 ; }
PREV_SUM=`tx_sum build-txcheck-prev translation` || { echo "$HEAD_SUM" ; exit 1 ; }

# An error message will have come from the shell function
test -d build-txcheck-head || { echo "$HEAD_SUM" ; exit 1 ; }
test -d build-txcheck-prev || { echo "$PREV_SUM" ; exit 1 ; }

if test "$HEAD_SUM" = "$PREV_SUM" ; then
	:
else
	echo "! Translations have changed."
	for f in $TX_FILE_LIST ; do
		echo "! $f"
		diff -u build-txcheck-prev/$f build-txcheck-head/$f
	done
	echo "! Run 'txcheck.sh --cleanup' to clean-up before next run"
	exit 1
fi

tx_cleanup
exit 0