#!/bin/bash

# Human friendly symbols
export readonly PASS=0
export readonly FAIL=1

# set debug level of yum install in t_InstallPackage
export YUMDEBUG=0

# Description: call this function whenever you need to log output (preferred to calling echo)
# Arguments: log string to display
function t_Log
{
	printf "[+] `date` -> $*\n"
}

# Description: call this at the end of your script to assess the exit status
# Arguments: the exit status from whatever you want checked (ie, '$?')
function t_CheckExitStatus
{
	[ $1 -eq 0 ] && { t_Log "PASS"; return $PASS; }

	t_Log "FAIL"
	exit $FAIL
}

# Description: call this to perform yum-based installs of packages
# Arguments: a space separated list of package names to install.
function t_InstallPackage
{
	t_Log "Attempting yum install: $*"
	/usr/bin/yum -y -d${YUMDEBUG} install "$@"
  # TODO: add a hook here, to make sure all binary files have ldd run
  # against them, and that there are no missing linker targets
	t_CheckExitStatus $?
}

# Description: call this to perform a yum-based removal of packages
# Arguments: a space separated list of package names to remove.
function t_RemovePackage
{
	t_Log "Attempting yum remove: $*"
	/usr/bin/yum -y -d0 remove "$@"
	t_CheckExitStatus $?
}

# Description: call this to process a list of folders containing test scripts
# Arguments: a file handle from which to read the names of paths to process.
function t_Process
{
	exec 7< $@
	
	while read -u 7 f
	do
		# skip files named readme or those that start with an _
		[[ "$(basename ${f})" =~ readme|^_ ]] &&  continue;
		
		# handy tip: chmod -x to disable individual test scripts.
		[ -x ${f} ] && ${f}
			
	done

	return 0
}

# Description: check to see if one or more packages are installed
# return true if they're all installed, false if not.
# Arguments: one or more package names to check for.
function t_CheckDeps
{
	# TODO
	
	# success, all packages are installed
	return 0
}

# Description: perform a service control and sleep for a few seconds to let
#   the dust settle. Using this function avoids a race condition wherein 
#   subsequent tests execute (and typically fail) before a service has had a 
#   chance to fully start/open a network port etc.
# Call it with cycle instead of start, and it will stop+start
#   handy, if you dont know the service might already be running
function t_ServiceControl
{
  if [ $2 = "cycle" ]; then
    /sbin/service $1 stop > /dev/null 2>&1
    sleep 3
    /sbin/service $1 start
  else
  	/sbin/service $1 $2
  fi

	# aaaand relax...
	sleep 3
}

# Description: Get a package (rpm) release number
function t_GetPkgRel
{
       rpm -q --queryformat '%{RELEASE}' $1 
}

# Description: return the distro release (returns 5 or 6 now)
function t_DistCheck
{
	rpm -q --queryformat '%{version}\n' centos-release
}
# Additionally set distro release to $centos_ver
centos_ver=$(t_DistCheck)

# Description: Get a package (rpm) version number
function t_GetPkgVer
{
       rpm -q --queryformat '%{version}' $1 
}

# Description: get the arch 
function t_GetArch
{
	rpm -q --queryformat '%{arch}\n' centos-release
}

function t_Assert
{
 $@ >/dev/null 2>&1
 t_CheckExitStatus $?
}

function t_Assert_Equals
{
 [ $1 -eq $2 ] 
 t_CheckExitStatus $?
}
export -f t_Log
export -f t_CheckExitStatus
export -f t_InstallPackage
export -f t_RemovePackage
export -f t_Process
export -f t_CheckDeps
export -f t_ServiceControl
export -f t_GetPkgRel
export -f t_DistCheck
export -f t_GetPkgVer
export -f t_GetArch
export -f t_Assert
export -f t_Assert_Equals
export centos_ver