#!/bin/sh
#-
# Copyright (c) 2011-2012 Devin Teske
# All Rights Reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/mustberoot.subr
f_include $BSDCFG_SHARE/strings.subr
f_include $BSDCFG_SHARE/timezone/continents.subr
f_include $BSDCFG_SHARE/timezone/countries.subr
f_include $BSDCFG_SHARE/timezone/iso3166.subr
f_include $BSDCFG_SHARE/timezone/menus.subr
f_include $BSDCFG_SHARE/timezone/zones.subr

BSDCFG_LIBE="/usr/libexec/bsdconfig" APP_DIR="090.timezone"
f_include_lang $BSDCFG_LIBE/$APP_DIR/include/messages.subr

ipgm=$( f_index_menu_selection $BSDCFG_LIBE/$APP_DIR/INDEX "$pgm" )
[ $? -eq $SUCCESS -a "$ipgm" ] && pgm="$ipgm"

############################################################ CONFIGURATION

#
# Standard pathnames
#
_PATH_DB="/var/db/zoneinfo"
_PATH_WALL_CMOS_CLOCK="/etc/wall_cmos_clock"

############################################################ GLOBALS

#
# Options
#
REALLYDOIT=1
REINSTALL=
USEDIALOG=1
SKIPUTC=
VERBOSE=
TZ_OR_FAIL=
CHROOTENV=

#
# Dummy vars (populated dynamically)
#
COUNTRIES= # list of 2-character country codes created by f_read_iso3166_table

############################################################ FUNCTIONS

# dialog_menu_main
#
# Display the dialog(1)-based application main menu.
#
dialog_menu_main()
{
	local title="$DIALOG_TITLE"
	local btitle="$DIALOG_BACKTITLE"
	local prompt="$msg_select_region"
	local size

	size=$( eval f_dialog_menu_size \
	        	\"\$title\"  \
	        	\"\$btitle\" \
	        	\"\$prompt\" \
			\"\"         \
	        	$continent_menu_list )

	local dialog_menu
	dialog_menu=$( eval $DIALOG \
		--title \"\$title\"             \
		--backtitle \"\$btitle\"        \
		--ok-label \"\$msg_ok\"         \
		--cancel-label \"\$msg_cancel\" \
		--menu \"\$prompt\" $size       \
		$continent_menu_list            \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	)
	local retval=$?
	setvar DIALOG_MENU_$$ "$dialog_menu"
	return $retval
}

############################################################ MAIN

# Incorporate rc-file if it exists
[ -f "$HOME/.bsdconfigrc" ] && f_include "$HOME/.bsdconfigrc"

#
# Process command-line arguments
#
while getopts C:ehnrsSvX flag; do
	case "$flag" in
	C) CHROOTENV="$OPTARG";;
	e) TZ_OR_FAIL=1;;
	n) REALLYDOIT=;;
	r) REINSTALL=1
	   USEDIALOG=;;
	s) SKIPUTC=1;;
	v) VERBOSE=1;;
	h|\?) f_usage $BSDCFG_LIBE/$APP_DIR/USAGE "PROGRAM_NAME" "$pgm";;
	esac
done
shift $(( $OPTIND - 1 ))

#
# Initialize
#
f_dialog_init
f_dialog_title "$msg_time_zone"
f_dialog_backtitle "${ipgm:+bsdconfig }$pgm"
f_mustberoot_init

#
# Process `-C chroot_directory' command-line argument
#
if [ "$CHROOTENV" ]; then
	_PATH_ZONETAB="$CHROOTENV$_PATH_ZONETAB"
	_PATH_ISO3166="$CHROOTENV$_PATH_ISO3166"
	_PATH_ZONEINFO="$CHROOTENV$_PATH_ZONEINFO"
	_PATH_LOCALTIME="$CHROOTENV$_PATH_LOCALTIME"
	_PATH_DB="$CHROOTENV$_PATH_DB"
	_PATH_WALL_CMOS_CLOCK="$CHROOTENV$_PATH_WALL_CMOS_CLOCK"
fi

#
# Process `-r' command-line option
#
if [ "$REINSTALL" ]; then
	[ -f "$_PATH_DB" -a -r "$_PATH_DB" ] ||
		f_die 1 "$msg_cannot_open_for_reading" "$_PATH_DB"
	zoneinfo=$( cat "$_PATH_DB" ) ||
		f_die 1 "$msg_error_reading" "$_PATH_DB"
	[ "$zoneinfo" ] ||
		f_die 1 "$msg_unable_to_determine_name_from_db" "$_PATH_DB"
	f_install_zoneinfo "$zoneinfo"
	exit $?
fi

#
# If the arguments on the command-line do not specify a file,
# then interpret it as a zoneinfo name
#
if [ $# -ge 1 ]; then
	zoneinfo="$1"

	if [ ! -f "$zoneinfo" ]; then
		USEDIALOG=
		f_install_zoneinfo "$zoneinfo"
		exit $?
	fi

	# FALLTHROUGH
fi

#
# Process the UTC option
#
if [ "$_PATH_WALL_CMOS_CLOCK" -a ! "$SKIPUTC" ]; then
	f_dialog_title "$msg_select_local_or_utc"
	title="$DIALOG_TITLE"
	btitle="$DIALOG_BACKTITLE"
	f_dialog_title_restore
	msg="$msg_is_machine_clock_utc"

	if [ "$USE_XDIALOG" ]; then
		defaultno="default-no"
		height=10 width=77
	else
		defaultno="defaultno"
		height=7 width=73
	fi

	if [ "$USE_XDIALOG" ]; then
		$DIALOG \
			--title "$title"         \
			--backtitle "$btitle"    \
			--$defaultno             \
			--ok-label "$msg_yes"    \
			--cancel-label "$msg_no" \
			--yesno "$msg" $height $width
		result=$?
	else
		$DIALOG \
			--title "$title"       \
			--backtitle "$btitle"  \
			--$defaultno           \
			--yes-label "$msg_yes" \
			--no-label "$msg_no"   \
			--yesno "$msg" $height $width
		result=$?
	fi

	if [ $result -eq 0 ]; then
		# User chose YES
		[ "$REALLYDOIT" ] &&
			f_quietly rm -f "$_PATH_WALL_CMOS_CLOCK"
	else
		# User chose NO, pressed ESC (or Ctrl-C), or closed box
		[ "$REALLYDOIT" ] &&
			( umask 222 && :> "$_PATH_WALL_CMOS_CLOCK" )
	fi
fi

#
# Process optional default zone argument
#
if [ $# -ge 1 ]; then
	default="$1"

	f_dialog_title "$msg_default_zone_provided"
	title="$DIALOG_TITLE"
	btitle="$DIALOG_BACKTITLE"
	f_dialog_title_restore
	msg=$( printf "\n$msg_use_default_zone" "$default" )
	size=$( f_dialog_buttonbox_size "$title" "$btitle" "$msg" )

	if [ "$USE_XDIALOG" ]; then
		eval $DIALOG \
			--title \"\$title\"         \
			--backtitle \"\$btitle\"    \
			--ok-label \"\$msg_yes\"    \
			--cancel-label \"\$msg_no\" \
			--yesno \"\$msg\" $size
		result=$?
	else
		eval $DIALOG \
			--title \"\$title\"       \
			--backtitle \"\$btitle\"  \
			--yes-label \"\$msg_yes\" \
			--no-label \"\$msg_no\"   \
			--yesno \"\$msg\" $size
		result=$?
	fi

	if [ $result -eq 0 ]; then
		# User chose YES
		f_install_zoneinfo_file "$default"
		result=$?
		[ ! "$USE_XDIALOG" ] && f_dialog_clear
		exit $result
	fi

	[ ! "$USE_XDIALOG" ] && f_dialog_clear
fi

#
# Override the user-supplied umask
#
umask 022

#
# Read databases and perform initialization
#
f_read_iso3166_table # creates $COUNTRIES and $country_*_name
f_read_zones         # creates $country_*_{descr,cont,filename}
f_sort_countries     # sorts the countries listed for each continent
f_make_menus         # creates $continent_menu_list and $continent_*_menu_list

#
# Launch application main menu
#
NEED_CONTINENT=1
NEED_COUNTRY=1
while :; do
	if [ "$NEED_CONTINENT" ]; then
		dialog_menu_main # prompt the user to select a continent/ocean
		retval=$?
		mtag=$( f_dialog_menutag )

		if [ $retval -ne 0 ]; then
			[ "$TZ_OR_FAIL" ] && f_die
			exit $SUCCESS
		fi

		NEED_CONTINENT=

		continent=$( eval f_dialog_menutag2item \"\$mtag\" \
		                  	$continent_menu_list )
		cont=$( f_find_continent "$continent" )
		cont_title=$( f_continent $cont title )
		nitems=$( f_continent $cont nitems )
		isocean=$( f_OCEANP $cont )
	fi

	if [ "$NEED_COUNTRY" ]; then
		if [ "$cont_title" = "$continent_utc_title" ]; then
			if f_set_zone_utc; then
				break
			else
				NEED_CONTINENT=1
				continue
			fi
		fi

		#
		# Short cut -- if there's only one country, don't post a menu.
		#
		if [ $nitems -eq 1 ]; then
			tag=1
		else
			#
			# It's amazing how much good grammar really matters...
			#
			if [ ! "$isocean" ]; then
				title=$( printf "$msg_country_title" \
				                "$cont_title" )
				f_dialog_title "$title"
				title="$DIALOG_TITLE"
				btitle="$DIALOG_BACKTITLE"
				f_dialog_title_restore
				prompt="$msg_select_country"
			else
				title=$( printf "$msg_island_and_group_title" \
				                "$cont_title" )
				f_dialog_title "$title"
				title="$DIALOG_TITLE"
				btitle="$DIALOG_BACKTITLE"
				f_dialog_title_restore
				prompt="$msg_select_island_or_group"
			fi

			#
			# Calculate size of menu
			#
			menu_list=$( f_continent $cont menu_list )
			size=$( eval f_dialog_menu_size \
			        	\"\$title\"  \
			        	\"\$btitle\" \
			        	\"\$prompt\" \
			        	\"\"         \
			        	$menu_list   )

			#
			# Launch the country selection menu
			#
			dialog_menu=$( eval $DIALOG \
				--title \"\$title\"             \
				--backtitle \"\$btitle\"        \
				--ok-label \"\$msg_ok\"         \
				--cancel-label \"\$msg_cancel\" \
				--menu \"\$prompt\" $size       \
				$menu_list                      \
				2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
			)
			retval=$?
			setvar DIALOG_MENU_$$ "$dialog_menu"
			tag=$( f_dialog_menutag )

			if [ $retval -ne 0 ]; then
				NEED_CONTINENT=1
				continue # back to main menu
			fi
		fi

		# Get the country code from the user's selection 
		tlc=$( f_continent $cont tlc_$tag )

		NEED_COUNTRY=
	fi

	#
	# If the selection has only one zone (nzones == -1),
	# just set it.
	#
	nzones=$( f_country $tlc nzones )
	if [ $nzones -lt 0 ]; then
		real_cont=$( f_country $tlc cont )
		real_continent=$( f_continent $real_cont name )
		name=$( f_country $tlc name )
		filename=$( f_country $tlc filename )

		if ! f_confirm_zone "$real_continent/$filename"; then
			[ $nitems -eq 1 ] && NEED_CONTINENT=1
			NEED_COUNTRY=1
			continue
		fi
	else
		title=$( printf "$msg_country_time_zones" \
		                "$( f_country $tlc name )" )
		f_dialog_title "$title"
		title="$DIALOG_TITLE"
		btitle="$DIALOG_BACKTITLE"
		f_dialog_title_restore
		prompt="$msg_select_zone"
		menu_list=$( f_country $tlc menu_list )
		size=$( eval f_dialog_menu_size \"\$title\"  \"\$btitle\" \
		        	\"\$prompt\" \"\" $menu_list )

		#
		# Launch the zone selection menu
		# NOTE: This is as deep as we go
		#
		dialog_menu=$( eval $DIALOG \
			--title \"\$title\"             \
			--backtitle \"\$btitle\"        \
			--ok-label \"\$msg_ok\"         \
			--cancel-label \"\$msg_cancel\" \
			--menu \"\$prompt\" $size       \
			$menu_list                      \
			2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
		)
		retval=$?
		setvar DIALOG_MENU_$$ "$dialog_menu"
		n=$( f_dialog_menutag )

		if [ $retval -ne 0 ]; then
			[ $nitems -eq 1 ] && NEED_CONTINENT=1
			NEED_COUNTRY=1
			continue
		fi

		real_cont=$( f_country $tlc cont_$n )
		real_continent=$( f_continent $real_cont name )
		name=$( f_country $tlc name )
		filename=$( f_country $tlc filename_$n )

		f_confirm_zone "$real_continent/$filename" || continue
	fi

	[ $retval -eq 0 ] || continue # back to main menu

	if ! f_install_zoneinfo "$real_continent/$filename"; then
		[ $nzones -lt 0 ] && NEED_COUNTRY=1
	else
		break
	fi
done

################################################################################
# END
################################################################################