#!/bin/bash
#-------------------------------------------------------------------------------
# This script downloads the latest sversion of org.apache.clerezza.integrationtest.web
# and org.apache.clerezza.integrationtest.web.performance
#-------------------------------------------------------------------------------
# Author: daniel.spicar@clerezza.org
#-------------------------------------------------------------------------------
# Requirements:	curl, wget, bash
#-------------------------------------------------------------------------------

# error codes
NO_ERROR=0
DOWNLOAD_FAILED=1
BAD_ARGUMENTS=2
REQUIREMENTS_NOT_FULFILLED=3
NOT_DOWNLOADED=4

command_test=$(whatis "curl" | grep 'nothing appropriate')
if [ -n "$command_test" ]; then
	echo "curl not found.";	
	exit $REQUIREMENTS_NOT_FULFILLED
fi
command_test=$(whatis "wget" | grep 'nothing appropriate')
if [ -n "$command_test" ]; then
	echo "wget not found.";	
	exit $REQUIREMENTS_NOT_FULFILLED
fi

# global vars
BIN_URI_FRAMEWORK=http://repo.trialox.org/snapshot/org/apache/clerezza/org.apache.clerezza.integrationtest.web/
BIN_URI_FRAMEWORK_RELEASE=`echo $BIN_URI_FRAMEWORK | sed 's/snapshot/release/'`
BIN_URI_PERFORMANCETEST=http://repo.trialox.org/snapshot/org/apache/clerezza/org.apache.clerezza.integrationtest.web.performance/
BIN_URI_PERFORMANCETEST_RELEASE=`echo $BIN_URI_PERFORMANCETEST | sed 's/snapshot/release/'`
LIB_DIR=`pwd`

# Prints the usage message
print_usage()
{
	echo "Usage: tx-getlatestframework [<output-directory> <framework-repo-uri> <performancetest-repo-uri>]"
}

# Checks whether the supplied file is present in LIB_DIR
# Args: file
check_file()
{
	local file

	if [ $# -eq 1 ]; then
		file=$1
	else
		return $BAD_ARGUMENTS;
	fi

	if [ -e $LIB_DIR/$file ]; then
		return 0
	else
		return 1
	fi
}

# Downloads the specified binary. Requires exactly 3 arguments.
# Args: uri
#		directory
#		file
download_bin()
{
	local uri
	local dir
	local file

	if [ $# -eq 3 ]; then
		uri=$1
		dir=$2
		file=$3
	else
		return $BAD_ARGUMENTS;
	fi
	
	if `check_file $file`; then
		echo "the most recent file is $LIB_DIR/$file and it is already downloaded."
		return $NOT_DOWNLOADED
	else
		if wget -O $LIB_DIR/$file $uri$dir$file ; then
			return $NO_ERROR
		fi
	fi

	return $DOWNLOAD_FAILED
}

# Checks if the first the first supplied version is higher than the second.
# Syntax: Versions are interpreted as follows: major_version.minor_version
# Example: to compare if 0.10 is larger than 0.9, the arguments are: 0 10 0 9
#
# NOTE: Same versions return true as well. 
# 		This means the first argument is prioritized.
#
# Args: major_version_first
#		minor_version_first
#		major_version_second
#		minor_version_second
is_higher_version()
{
	if [ $# -ne 4 ]; then
		return $BAD_ARGUMENTS
	fi

	if [ $1 -gt $3 ]; then
		return 0
	else
		if [ $1 -eq $3 ]; then
			if [ $2 -ge $4 ]; then
				return 0
			fi
		fi	
	fi

	return 1
}

# Get the latest binary.
# Args: uri
#		uri_release
# Returns: An array with latest_uri latest_dir latest_file in that order.
get_latest_version()
{
	if [ $# -ne 2 ]; then
		return $BAD_ARGUMENTS
	fi

	local uri
	local uri_release
	local major_version_release
	local minor_version_release
	local major_version_snapshot
	local minor_version_snapshot
	local major_version
	local minor_version

	uri=$1
	uri_release=$2
	major_version_release=-1
	minor_version_release=-1
	for line in `curl $uri_release 2> /dev/null | sed 's/^.*\">//;s/<\/a.*$//;1,/Parent Directory/d;/^[^0-9]/,$d;'`; do		
		major_version=`echo $line | sed 's/\.[0-9]\+\///'`
		minor_version=`echo $line | sed 's/\///;s/^[0-9]\+\.//'`
		if `is_higher_version $major_version $minor_version $major_version_release $minor_version_release`; then
			major_version_release=$major_version
			minor_version_release=$minor_version
			latest_dir_release=$line
		fi		
	done

	major_version_snapshot=-1
	minor_version_snapshot=-1
	for line in `curl $uri 2> /dev/null | sed 's/^.*\">//;s/<\/a.*$//;1,/Parent Directory/d;/^[^0-9]/,$d;'`; do
		major_version=`echo $line | sed 's/\.[0-9]\+-SNAPSHOT\///'`
		minor_version=`echo $line | sed 's/-SNAPSHOT\///;s/^[0-9]\+\.//'`
		if `is_higher_version $major_version $minor_version $major_version_snapshot $minor_version_snapshot`; then
			major_version_snapshot=$major_version
			minor_version_snapshot=$minor_version
			latest_dir=$line
		fi	
	done

	if `is_higher_version $major_version_release $minor_version_release $major_version_snapshot $minor_version_snapshot`; then
		latest_dir=$latest_dir_release
		uri=$uri_release
	fi

	for line in `curl $uri$latest_dir 2> /dev/null | sed '1,/<a href=\"o/d;/<hr>/,$d;/\.jar</!d;/sources/d;s/^ *<a href=\"//;s/\">.*$//'`; do
        latest_file=$line
	done

	local ret
	ret=( $uri $latest_dir $latest_file )
	echo ${ret[@]}
}

# main script
# Argument handling
if [ $# -lt 4 ]; then	
	if [ $# -ge 1 ]; then
		case $1 in
			-*)  print_usage; exit $NO_ERROR;;			
			*)   LIB_DIR=$1;;
		esac
	fi
	if [ $# -ge 2 ]; then
		BIN_URI_FRAMEWORK=$2
		BIN_URI_FRAMEWORK_RELEASE=`echo $BIN_URI_FRAMEWORK | sed 's/snapshot/release/'`
	fi
	if [ $# -eq 3 ]; then
		BIN_URI_PERFORMANCETEST=$3
		BIN_URI_PERFORMANCETEST_RELEASE=`echo $BIN_URI_PERFORMANCETEST | sed 's/snapshot/release/'`
	fi
else
	echo "Too many arguments!"
	print_usage
	exit $BAD_ARGUMETNS
fi


latest_version=( `get_latest_version $BIN_URI_FRAMEWORK $BIN_URI_FRAMEWORK_RELEASE` )
echo ${latest_version[@]}
download_bin ${latest_version[@]}
latest_version=( `get_latest_version $BIN_URI_PERFORMANCETEST $BIN_URI_PERFORMANCETEST_RELEASE` )
download_bin ${latest_version[@]}
exit $?