#!/bin/sh

TAGLENGTH=3
COREFILE='Source/Core/Core.js'
PKGFILES='package.json bower.json'

DIST='node_modules/.bin/grunt'
DIST_ARGS='distBuild'
DIST_DIR='dist'

DIR=`dirname "$0"`
COREFILE="$DIR/$COREFILE"
TAG=`echo "$1" | cut -d'.' -f-$TAGLENGTH`
SUFFIX="`echo "$2" | tr '[A-Z]' '[a-z]'`"
BUILD=`sh -c "cd '$DIR' && git rev-parse HEAD"`
CUTLENGTH=`echo "$TAGLENGTH - 1" | bc`

usage(){
	moo "Usage: $0 <tag> [suffix]

  suffix: alpha, beta or rc*"
}

moo(){
	echo "$1" >&2
	exit 1
}

get_suffixnumber(){
	NUMBER=`echo "$1" | sed 's/^[a-z]*[ 	]*\([0-9]*\).*/\1/'`
	[ -n "$NUMBER" ] && echo "$NUMBER" || echo "1"
}

[ -z "$1" -o "$1" = '-h' -o "$1" = '--help' ] && usage
[ -z "$BUILD" ] && moo 'Unable to determine build.'
[ -z "$DIST" -o -x "$DIR/$DIST" ] || moo "Cannot execute '$DIST', did you npm install?"

until [ -n "`echo "$TAG." | cut -d'.' -f$TAGLENGTH`" ]; do
	TAG="$TAG.0"
done

case "$SUFFIX" in
	'') RELEASE=''; SUFFIX='';;
	a*) NUMBER="`get_suffixnumber $SUFFIX`"; RELEASE=" Alpha $NUMBER"; SUFFIX="-a$NUMBER";;
	b*) NUMBER="`get_suffixnumber $SUFFIX`"; RELEASE=" Beta $NUMBER"; SUFFIX="-b$NUMBER";;
	rc*) NUMBER="`get_suffixnumber $SUFFIX`"; RELEASE=" Release Candidate $NUMBER"; SUFFIX="-rc$NUMBER";;
	*) moo 'Invalid suffix specified.';;
esac

if [ "$TAG" != "$1" ]; then
	echo -n "Did you mean $TAG$SUFFIX? (y/n): "
	read FIXTAG
	[ "$FIXTAG" = "y" ] || moo "Invalid tag specified, this project's tags consist of $TAGLENGTH parts."
fi

sh -c "cd '$DIR' && git show-ref --quiet --tags '$TAG$SUFFIX'" && moo "Tag $TAG$SUFFIX already exists."

if [ -z "$SUFFIX" ]; then
	MINOR=`echo "$TAG" | cut -d'.' -f$TAGLENGTH-`
	[ -z "$MINOR" ] && MINOR='0'
	NEXTTAG="`echo "$TAG" | cut -d'.' -f-$CUTLENGTH`.`echo "$MINOR + 1" | bc`-dev"
else
	NEXTTAG="${TAG}-dev"
fi

if [ -n "$DIST" -a -d "$DIR/$DIST_DIR" ]; then
	echo -n "The '$DIST_DIR' directory already exists. Overwrite it? (y/n): "
	read DELETEDIST
	if [ "$DELETEDIST" = "y" ]; then
		sh -c "cd '$DIR' && git rm -r '$DIR/$DIST_DIR'"
	else
		moo "Aborting, will not overwrite '$DIST_DIR'."
	fi
fi

# Replace build and version strings.
sed -i".$BUILD" -e "s/\(version:[ 	]*\)'[0-9.]*-dev'/\1'$TAG$SUFFIX'/" -e "s/\(build:[ 	]*\)'%build%'/\1'$BUILD'/" "$COREFILE" || moo "Error setting version and build for $TAG$SUFFIX in $COREFILE."
sh -c "cd '$DIR' && git add '$COREFILE'" || moo "Error adding changed $COREFILE for $TAG$SUFFIX to repository."
for PKGFILE in $PKGFILES; do
	PKGFILE="$DIR/$PKGFILE"
	sed -i".$BUILD" -e "s/^\([ 	]*\"version\":[ 	]*\)\"[0-9.]*-dev\"/\1\"$TAG$SUFFIX\"/" "$PKGFILE" || moo "Error setting version for $TAG$SUFFIX in $PKGFILE."
	sh -c "cd '$DIR' && git add '$PKGFILE'" || moo "Error adding changed $PKGFILE for $TAG$SUFFIX to repository."
done

# Build dist files.
if [ -n "$DIST" ]; then
	echo "Building '$DIST_DIR' files." >&2
	sh -c "cd '$DIR' && $DIST $DIST_ARGS" || moo "Error building '$DIST_DIR' files."
	sh -c "cd '$DIR' && git add -f '$DIR/$DIST_DIR'" || moo "Error adding '$DIST_DIR' files to repository."
	echo "Succesfully built '$DIST_DIR' files." >&2
fi

# Make the new release final.
sh -c "cd '$DIR' && git commit -qm 'Welcome $TAG$SUFFIX.'" || moo "Error committing $TAG$SUFFIX."
sh -c "cd '$DIR' && git tag -am '$TAG$RELEASE.' '$TAG$SUFFIX'" || moo "Error tagging $TAG$SUFFIX."
echo "Tagged $TAG$SUFFIX." >&2

# Revert to old corefile and pkgfiles.
mv "$COREFILE.$BUILD" "$COREFILE" || moo "Error reverting version and build in $COREFILE."
for PKGFILE in $PKGFILES; do
	PKGFILE="$DIR/$PKGFILE"
	mv "$PKGFILE.$BUILD" "$PKGFILE" || moo "Error reverting version in $PKFILE."
done

# Replace build and version strings.
sed -i".$BUILD" -e "s/\(version:[ 	]*\)'[0-9.]*-dev'/\1'$NEXTTAG'/" "$COREFILE" || moo "Error setting version $NEXTTAG in $COREFILE."
sh -c "cd '$DIR' && git add '$COREFILE'" || moo "Error adding changed $COREFILE for $NEXTTAG to repository."
for PKGFILE in $PKGFILES; do
	PKGFILE="$DIR/$PKGFILE"
	sed -i".$BUILD" -e "s/^\([ 	]*\"version\":[ 	]*\)\"[0-9.]*-dev\"/\1\"$NEXTTAG\"/" "$PKGFILE" || moo "Error setting version for $NEXTTAG in $PKGFILE."
	sh -c "cd '$DIR' && git add '$PKGFILE'" || moo "Error adding changed $PKGFILE for $NEXTTAG to repository."
done

# Clean up temporary and dist files.
rm "$COREFILE.$BUILD" || moo "Error cleaning up $COREFILE.$BUILD."
for PKGFILE in $PKGFILES; do
	PKGFILE="$DIR/$PKGFILE"
	rm "$PKGFILE.$BUILD" || moo "Error cleaning up $PKGFILE.$BUILD."
done
if [ -n "$DIST" ]; then
	sh -c "cd '$DIR' && git rm -qr '$DIR/$DIST_DIR'" || moo "Error cleaning up '$DIST_DIR' files."
fi

# Make the new dev version final.
sh -c "cd '$DIR' && git commit -qm 'Hello $NEXTTAG.'" || moo "Error committing $NEXTTAG."
echo "Committed $NEXTTAG." >&2