#!/bin/bash

# Created on 7/17/13 by Ryan Sechrest
# Deploys pushed branch from the origin repository to the web directory

if [[ (-n $1) && (-n $2) && (-n $3) ]]; then

	# Set path to project directory
	project_path="/var/www/domains/$2/$3"

	# Set web directory name
	web_dir="public"

	# Set path to web directory
	web_path="$project_path/$web_dir"

	# For each branch that was pushed
	while read oldrev newrev refname
	do

		# Get branch name
		branch=$(git rev-parse --symbolic --abbrev-ref $refname)
		echo "> Received $branch branch"

		# Assume no target branch pushed
		target_branch=false

		# Assume environment group is production
		env_group="PRODUCTION"

		# Determine whether current branch is target branch for environment
		if [[ "$FH_ENVIRONMENT" == "LOCALHOST" ]]; then
			echo '> Determined environment is LOCALHOST'

			env_group="DEVELOPMENT"
			echo '> Determine environment group is DEVELOPMENT'

			if [[ "$branch" == "develop" || "$branch" == "feature/"* ]]; then
				target_branch=true
				echo "> Determined $branch branch is target branch"

			fi
		elif [[ "$FH_ENVIRONMENT" == "DEVELOPMENT" ]]; then
			echo '> Determined environment is DEVELOPMENT'

			env_group="DEVELOPMENT"
			echo '> Determine environment group is DEVELOPMENT'

			if [[ "$branch" == "develop" ]]; then
				target_branch=true
				echo "> Determined $branch branch is target branch"

			fi
		elif [[ "$FH_ENVIRONMENT" == "STAGING" ]]; then
			echo "> Determined environment is STAGING"

			if [[ "$branch" == "master" ]]; then
				target_branch=true
				echo "> Determined $branch branch is target branch"

			fi
		else
			echo "> Determined environment is PRODUCTION"

			if [[ "$branch" == "master" ]]; then
				target_branch=true
				echo "> Determined $branch branch is target branch"

			fi
		fi

		# If branch is target branch
		if $target_branch ; then
			echo "> Processing $branch branch"

			# Unset global GIT_DIR so script can leave repository
			unset GIT_DIR
			echo "> Unset GIT_DIR"

			# Move into project directory
			cd $project_path
			echo "> Moved into $project_path directory"

			# If project directory is empty
			if find . -maxdepth 0 -empty | read; then
				echo "> Determined project directory is empty"

				# Clone branch from origin repository into project directory
				git clone /opt/repositories/$1.git -b $branch .
				echo "> Cloned origin/$branch branch from $1.git repository into project directory"

				# Create empty file to remember created date
				touch $project_path/.created
				echo "> Created .created file in project directory"

			# If project directory is not empty
			else
				echo "> Determined project directory contains files"

				# Get HEAD of working directory
				current_branch=$(git rev-parse --abbrev-ref HEAD)
				echo "> Determined working directory is on $current_branch branch"

				# If branch matches HEAD of working directory
				if [ "$branch" == "$current_branch" ]; then
					echo "> Determined updates affect current branch"
					
					# Fetch changes from origin
					git fetch origin
					echo "> Fetched changes from origin"

					# Fetch and merge changes into project directory
					git pull origin $branch
					echo "> Pulled origin/$branch into $branch branch in project directory"

				# If branch does not match HEAD of working directory
				else
					echo "> Determined updates belong to new branch"

					# Fetch changes from origin
					git fetch origin
					echo "> Fetched changes from origin"

					# Checkout new branch
					git checkout $branch
					echo "> Checked out $branch branch in project directory"

				fi

				# Create or update empty file to remember last updated date
				touch $project_path/.updated
				echo "> Updated .updated file in project directory"

			fi

			# Install PHP dependencies
			if [[ "$env_group" == "DEVELOPMENT" ]]; then
				composer install
			else
				composer install --no-dev
			fi
			echo "> Installed dependencies with composer"

			# Install Node dependencies
			npm install
			echo "> Installed node modules"
			
			# Run Gulp tasks
			if [[ "$env_group" == "DEVELOPMENT" ]]; then
				gulp
			else
				gulp --production
			fi
			echo "> Executed gulp tasks"
		fi
	done

# Print arguments to debug
else
	echo "Not all required variables have values:"
	echo "> FULL_DOMAIN: $1"
	echo "> ROOT_DOMAIN: $2"
	echo "> SUB_DOMAIN: $3"
fi