#!/usr/bin/env bash
########################################################################
# 2014-09-07 Lukas Bestle mail@lukasbestle.com
########################################################################
# Prepares a project for deployment and sets the origin repository and
# branch the project is connected to.
#
# Usage: project_origin <project> [<origin>]
#        
#        <project>	Path to the project
#        <origin>		Repository URL and branch name (<url>[#<branch>])
#                		If omitted, the origin gets deleted.
#                		If the string does not contain a "#", the branch is
#                		set to "master" ($CONFIG_DEFAULT_BRANCH).
########################################################################

project="$1"
origin="$2"

# Load configuration
CONFIG_DEFAULT_BRANCH="master"
if [[ -f "$HOME/.project.cnf" ]]; then
	source "$HOME/.project.cnf"
fi

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

if [[ -n "$origin" ]]; then
	# Origin was defined, initialize
	
	# Check if there are project files already
	files=$(shopt -s nullglob; shopt -s dotglob; echo "$project/current"/*)
	if [[ ${#files} -gt 0 ]]; then
		echo -e "\033[31mThe project \033[34m$project\033[31m already has a non-empty \033[34mcurrent\033[31m directory. Please backup and delete it first.\033[0m" >&2
		exit 1
	fi
	
	# Delete the symlink or directory "current"
	if ! rm -Rf "$project/current"; then
		echo -e "\033[31mCould not delete old \033[34mcurrent\033[31m link/directory.\033[0m" >&2
		exit 1
	fi
	
	# Split origin URL and branch by "#" character
	if [[ "$origin" == *#* ]]; then
		url="$(echo "$origin" | cut -f1 -d#)"
		branch="$(echo "$origin" | cut -f2 -d#)"
	else
		# No branch given, set to master
		url="$origin"
		branch=$CONFIG_DEFAULT_BRANCH
	fi
	
	# Check if the required directory structure already exists
	if [[ ! -d "$project/versions" || ! -d "$project/logs" ]]; then
		# Create structure for deployable projects
		echo -e "\033[1mInitializing deployment directory structure for project \033[34m$project\033[0;1m...\033[0m"
		if ! (mkdir -p "$project/versions" && mkdir -p "$project/logs"); then
			echo -e " => \033[31mSomething went wrong.\033[0m" >&2
			exit 1
		fi
		echo -e " => \033[32mSuccess.\033[0m"
	fi
	
	# Set origin and branch files
	echo -e "\033[1mSetting URL to \033[34m$url\033[0;1m and branch to \033[34m$branch\033[0;1m...\033[0m"
	if ! (echo -n "$url" > "$project/.origin" && echo -n "$branch" > "$project/.branch"); then
		echo -e " => \033[31mSomething went wrong.\033[0m" >&2
		exit 1
	fi
	echo -e " => \033[32mSuccess.\033[0m"
else
	# Origin was not defined, unset
	
	# Check if the project has an origin
	if [[ ! -f "$project/.origin" ]]; then
		echo -e "\033[31mThe project \033[34m$project\033[31m does not currently have an origin.\033[0m" >&2
		exit 1
	fi
	
	echo -e "\033[1mDeleting origin configuration files for project \033[34m$project\033[0;1m...\033[0m"
	if ! rm -f "$project/.origin" "$project/.branch"; then
		echo -e " => \033[31mSomething went wrong.\033[0m" >&2
		exit 1
	fi
	echo -e " => \033[32mSuccess.\033[0m"
fi

# Remove repo to make sure the new origin is used in the future
if [[ -d "$project/repo" ]]; then
	echo -e "\033[1mDeleting the old repository for project \033[34m$project\033[0;1m...\033[0m"
	if ! rm -Rf "$project/repo"; then
		echo -e " => \033[31mSomething went wrong.\033[0m" >&2
		exit 1
	fi
	echo -e " => \033[32mSuccess.\033[0m"
fi