#!/usr/bin/env bash
########################################################################
# 2014-09-07 Lukas Bestle mail@lukasbestle.com
########################################################################
# Reverses a deployable project to the last version.
#
# Usage: project_rollback <project>
#        
#        <project>	Path to the project
########################################################################

project="$1"

if [[ -z "$project" ]]; then
	# Print help
	echo -e "\033[1mUsage:\033[0m \033[34mproject_rollback\033[0m <project>"
	exit 1
fi

# Check if the project exists
if [[ ! -f "$project/.project" ]]; then
	echo -e "\033[31mThe project \033[34m$project\033[31m does not exist or is invalid.\033[0m" >&2
	exit 1
fi

# Check if the project is deployable
if [[ ! -f "$project/.origin" ]]; then
	echo -e "\033[31mThe project \033[34m$project\033[31m is not deployable and therefore can't be rolled back.\033[0m" >&2
	exit 1
fi

# Check if the project currently has a last version
if [[ ! -e "$project/last" ]]; then
	echo -e "\033[31mThe project \033[34m$project\033[31m currently does not have a last version.\033[0m" >&2
	echo -e "\033[31mProbably, it has already been rolled back since the latest deployment.\033[0m" >&2
	exit 1
fi

echo -e "\033[1mRolling project \033[34m$project\033[0;1m back to last version...\033[0m"
if rm -f "$project/current" && mv "$project/last" "$project/current"; then
	echo -e " => \033[32mSuccess.\033[0m"
	exit 0
else
	echo -e " => \033[31mSomething went wrong.\033[0m" >&2
	exit 1
fi