#!/bin/sh

# $Id: prerequisites_imapsync,v 1.25 2018/04/24 00:14:23 gilles Exp gilles $

MODULES_MANDATORY='
App::cpanminus
Authen::NTLM
CGI
Compress::Zlib
Crypt::OpenSSL::RSA
Data::Dumper
Data::Uniqid
Digest::HMAC
Digest::HMAC_MD5
Digest::MD5
Dist::CheckConflicts
Encode::Byte
File::Copy::Recursive
IO::Socket::INET
IO::Socket::INET6
IO::Socket::SSL
IO::Tee
JSON
JSON::WebToken
JSON::WebToken::Crypt::RSA
HTML::Entities
LWP::UserAgent
Mail::IMAPClient
Module::Implementation
Module::Runtime
Module::ScanDeps
Net::SSLeay
Package::Stash
Package::Stash::XS
PAR::Packer
Parse::RecDescent
Pod::Usage
Readonly
Regexp::Common
Sys::MemInfo
Term::ReadKey
Test::Fatal
Test::Mock::Guard
Test::MockObject
Test::More
Test::Pod
Test::Requires
Test::NoWarnings
Test::Deep
Test::Warn
Try::Tiny
Unicode::String
URI::Escape
'


test_perl() {
# First we need perl

	if perl -v > /dev/null 2>&1 ; then
		perl_version=`perl -e 'printf "%vd\n", $^V;'`
		echo Ok: Found Perl $perl_version
		return 0
	else
		echo Failure: Perl is not here. You have to install Perl first.
		return 1
	fi
}

test_make() {
# Second we need make to build some Perl modules

	if make -v > /dev/null 2>&1 ; then
		make_version=`make -v |head -1`
		echo Ok: Found make $make_version
		return 0
	else
		echo Failure: make is not here. You have to install the make command.
		return 1
	fi
}




test_module() {
	test -n $1 || return
	M_tested=$1
	shift
	if perl -m"$M_tested" -e '' >/dev/null 2>&1 ; then
		echo "Ok: Found Perl module $M_tested"
	else
		echo "Failure: Not found Perl module $M_tested $@"
		LIST_TO_INSTALL="$LIST_TO_INSTALL $M_tested"
	fi
        return
}

test_mandatory_modules() {
	for M in $MODULES_MANDATORY
	do
		test_module $M
	done
}


search_modules_any() {
	test -n "$*" || {
		echo "All needed modules are already installed"
		return
	}
	apt-file -h > /dev/null 2>&1 && {
		search_modules_apt "$@"
		return
	}
	yum -h > /dev/null 2>&1 && {
		search_modules_yum  "$@"
		return
	}
	
	# no yum, no apt-get
	{
		search_modules_cpanm "$@"
		return
	}
}

search_modules_cpanm() {
		cat <<EOD
Here is a cpanm command to install missing Perl modules:
cpanm "$@"
EOD
}


search_modules_yum() {
	echo 
	echo Searching rpm packages names
	for M in "$@" ; do
		echo "==== Searching rpm package name for $M"
		F=`echo $M|tr -s ":" "/"`.pm
		echo yum -q whatprovides "*/$F"
		echo
		yum -q whatprovides "*/$F"
		echo
	done
}

search_modules_apt() {
	echo 
	echo Searching deb packages names
	for M in "$@" ; do
		echo "==== Searching deb package name for $M"
		F=`echo $M|tr -s ":" "/"`.pm
		#echo apt-file search /$F
		echo
		apt-file search /$F
		#apt-cache search "$M"
		echo
	done
}


list_to_install() {
	test -n "$LIST_TO_INSTALL" || return 0
	echo
	echo 'What you have to do before using imapsync:'
	for M in $LIST_TO_INSTALL ; do
		echo "Install Perl module $M"
	done
        # return false/bad if some modules are missing.
        return 1
}

test_unix() {
	echo '$SHELL says ' $SHELL
	echo '$0 gives ' $0 
	echo -n "ps -ef gives " ; ps -ef | grep $$ | grep -v grep| grep -v 'ps -ef'
	sw_vers > /dev/null 2>&1 && sw_vers # Darwin
	lsb_release -dirc > /dev/null 2>&1 && lsb_release -dirc # Linux
	uname -a
}

test_unix
#exit
test_perl || exit
test_make || exit
test_mandatory_modules
list_to_install
EXIT=$?

# Help the user to install missing modules
search_modules_any $LIST_TO_INSTALL

test "$1" = "MODULES_MANDATORY" && search_modules_any $MODULES_MANDATORY
exit $EXIT