#!/usr/bin/env bash
#
# This hook verifies that the commit message follows deis commit style
# To install this hook run the following command from the deis git root
# cp contrib/util/commit-msg .git/hooks/commit-msg
set -eo pipefail

RED=$(tput setaf 1)
YELLOW=$(tput setaf 3)
NORMAL=$(tput sgr0)
subject_regex="^(feat|fix|docs|style|ref|test|chore)\(.+\): [\w\s\d]*"
capital_regex="^.+\): [a-z][\w\s\d]*"

MESSAGE[1]="file"

i=1 # the first array variable is at index 1
while read line
do
	MESSAGE[$i]=$line
	let i++
done < "$1"

SUBJECT=${MESSAGE[1]}

if ! [[ $SUBJECT =~ $subject_regex ]]; then
	echo "${RED}ERROR - Invalid subject line."
	echo ""
	echo "$SUBJECT"
	echo ""
	echo "It must be in the format: {type}({scope}): {subject}"
	echo ""
	echo "The following {type}s are allowed:"
	echo "feat"
	echo "fix"
	echo "docs"
	echo "style"
	echo "ref"
	echo "test"
	echo "chore"
	echo ""
	echo "Read more at http://docs.deis.io/en/latest/contributing/standards/$NORMAL"
	exit 0
fi

if ! [[ $SUBJECT =~ $capital_regex ]]; then
	echo "${RED}ERROR - Don't the capitalize commit message."
	echo ""
	echo "$SUBJECT"
	echo ""
	echo "Read more at http://docs.deis.io/en/latest/contributing/standards/$NORMAL"
	exit 0
fi

if [[ ${#SUBJECT} -gt 50 ]]; then
	echo "${YELLOW}WARNING - Subject shouldn't be longer than 50 characters."
	echo ""
	echo "Read more at http://docs.deis.io/en/latest/contributing/standards/$NORMAL"
	exit 0
fi

if [[ ${#MESSAGE[2]} -gt 0 ]]; then
	echo "${RED}ERROR - Second line must be blank"
	echo ""
	echo "Read more at http://docs.deis.io/en/latest/contributing/standards/$NORMAL"
	exit 0
fi

cnt=${#MESSAGE[@]}
for (( i = 3 ; i <= cnt ; i++ ))
do
		if [[ ${#MESSAGE[$i]} -gt 72 ]] && [[ ${MESSAGE[$i]:0:1} != '#' ]]; then
			echo "${RED}ERROR on line $i -  can't be longer than 72 characters."
			echo ""
			echo "Read more at http://docs.deis.io/en/latest/contributing/standards/$NORMAL"
			exit 0
		fi
done

echo "Your commit message follows the deis commit style."

exit 0