#!/bin/sh

set -e -f -u

# This comment is used to simplify checking local copies of the script.  Bump
# this number every time a significant change is made to this script.
#
# AdGuard-Project-Version: 5

# TODO(a.garipov): Add pre-merge-commit.

# Only show interactive prompts if there a terminal is attached to stdout.
# While this technically doesn't guarantee that reading from /dev/tty works,
# this should work reasonably well on all of our supported development systems
# and in most terminal emulators.
is_tty='0'
if [ -t '1' ]; then
	is_tty='1'
fi
readonly is_tty

# prompt is a helper that prompts the user for interactive input if that can be
# done.  If there is no terminal attached, it sleeps for two seconds, giving the
# programmer some time to react, and returns with a zero exit code.
prompt() {
	if [ "$is_tty" -eq '0' ]; then
		sleep 2

		return 0
	fi

	while true; do
		printf 'commit anyway? y/[n]: '
		read -r ans </dev/tty

		case "$ans" in
		'y' | 'Y')
			break
			;;
		'' | 'n' | 'N')
			exit 1
			;;
		*)
			continue
			;;
		esac
	done
}

# Warn the programmer about unstaged changes and untracked files, but do not
# fail the commit, because those changes might be temporary or for a different
# branch.
#
# shellcheck disable=SC2016
awk_prog='substr($2, 2, 1) != "." { print $9; } $1 == "?" { print $2; }'
readonly awk_prog

unstaged="$(git status --porcelain=2 | awk "$awk_prog")"
readonly unstaged

if [ "$unstaged" != '' ]; then
	printf 'WARNING: you have unstaged changes:\n\n%s\n\n' "$unstaged"
	prompt
fi

# Warn the programmer about temporary todos and skel FIXMEs, but do not fail the
# commit, because the commit could be in a temporary branch.
temp_todos="$(
	git grep -e 'FIXME' -e 'TODO.*!!' -- \
		':!./scripts/hooks/pre-commit' \
		':!./client' \
		|| :
)"
readonly temp_todos

if [ "$temp_todos" != '' ]; then
	printf 'WARNING: you have temporary todos:\n\n%s\n\n' "$temp_todos"
	prompt
fi

verbose="${VERBOSE:-0}"
readonly verbose

if [ "$(git diff --cached --name-only -- '*.md' || :)" != '' ]; then
	make VERBOSE="$verbose" md-lint
fi

if [ "$(git diff --cached --name-only -- '*.sh' || :)" != '' ]; then
	make VERBOSE="$verbose" sh-lint
fi

if [ "$(git diff --cached --name-only -- '*.md' '*.txt' '*.yaml' '*.yml' || :)" != '' ]; then
	make VERBOSE="$verbose" txt-lint
fi

if [ "$(git diff --cached --name-only -- '*.go' '*.mod' 'Makefile' || :)" != '' ]; then
	make VERBOSE="$verbose" go-os-check go-lint go-test
fi

if [ "$(git diff --cached --name-only -- './openapi/openapi.yaml' || :)" != '' ]; then
	make VERBOSE="$verbose" openapi-lint
fi