#!/bin/sh
#-
# Copyright (c) 2011-2015 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 (INCLUDING, 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_dprintf "%s: loading includes..." "$0"
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

f_index_menusel_keyword $BSDCFG_LIBE/$APP_DIR/INDEX "$pgm" ipgm &&
	pgm="${ipgm:-$pgm}"

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

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

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

#
# Options
#
REALLYDOIT=1
REINSTALL=
USEDIALOG=1
SKIPUTC= # See MAIN
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 defaultitem= # Calculated below
	local hline=

	local height width rows
	eval f_dialog_menu_size height width rows \
	                        \"\$title\"  \
	                        \"\$btitle\" \
	                        \"\$prompt\" \
	                        \"\$hline\"  \
	                        $continent_menu_list

	# Obtain default-item from previously stored selection
	f_dialog_default_fetch defaultitem

	local menu_choice
	menu_choice=$( eval $DIALOG \
		--title \"\$title\"              \
		--backtitle \"\$btitle\"         \
		--hline \"\$hline\"              \
		--ok-label \"\$msg_ok\"          \
		--cancel-label \"\$msg_cancel\"  \
		--default-item \"\$defaultitem\" \
		--menu \"\$prompt\"              \
		$height $width $rows             \
		$continent_menu_list             \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	)
	local retval=$?
	f_dialog_data_sanitize menu_choice
	f_dialog_menutag_store "$menu_choice"
	f_dialog_default_store "$menu_choice"
	return $retval
}

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

# Skip initial question regarding UTC v. Wall-Clock time if run in VM
[ "$( sysctl -n kern.vm_guest 2> /dev/null )" = "none" ] || SKIPUTC=1

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

#
# Process command-line arguments
#
while getopts C:ehnrsv$GETOPTS_STDARGS flag; do
	case "$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_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"
	f_eval_catch -dk zoneinfo "$0" cat 'cat "%s"' "$_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 $DIALOG_OK ]; then
		# User chose YES
		[ "$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 "$msg_default_zone_provided"
	f_sprintf msg "\n$msg_use_default_zone" "$default"
	hline=
	f_dialog_yesno "$msg" "$hline"
	result=$?
	f_dialog_title_restore

	if [ $result -eq $DIALOG_OK ]; then
		# User chose YES
		f_install_zoneinfo_file "$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
#
defaultctry=
defaultzone=
NEED_CONTINENT=1
NEED_COUNTRY=1
while :; do
	if [ "$NEED_CONTINENT" ]; then
		dialog_menu_main # prompt the user to select a continent/ocean
		retval=$?
		f_dialog_menutag_fetch mtag

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

		NEED_CONTINENT=

		continent=$( eval f_dialog_menutag2item \"\$mtag\" \
		                  	$continent_menu_list )
		f_find_continent "$continent" cont
		f_continent $cont title cont_title
		f_continent $cont nitems nitems
		f_OCEANP $cont isocean
	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
				f_sprintf title "$msg_country_title" \
				                "$cont_title"
				f_dialog_title "$title"
				title="$DIALOG_TITLE"
				btitle="$DIALOG_BACKTITLE"
				f_dialog_title_restore
				prompt="$msg_select_country"
			else
				f_sprintf title "$msg_island_and_group_title" \
				                "$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
			#
			f_continent $cont menu_list menu_list
			eval f_dialog_menu_size height width rows \
			                        \"\$title\"  \
			                        \"\$btitle\" \
			                        \"\$prompt\" \
			                        \"\"         \
			                        $menu_list

			#
			# Launch the country selection menu
			#
			tag=$( eval $DIALOG \
				--title \"\$title\"              \
				--backtitle \"\$btitle\"         \
				--ok-label \"\$msg_ok\"          \
				--cancel-label \"\$msg_cancel\"  \
				--default-item \"\$defaultctry\" \
				--menu \"\$prompt\"              \
				$height $width $rows             \
				$menu_list                       \
				2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
			)
			retval=$?
			f_dialog_data_sanitize tag
			defaultctry="$tag"

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

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

		NEED_COUNTRY=
	fi

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

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

		#
		# Launch the zone selection menu
		# NOTE: This is as deep as we go
		#
		n=$( eval $DIALOG \
			--title \"\$title\"              \
			--backtitle \"\$btitle\"         \
			--ok-label \"\$msg_ok\"          \
			--cancel-label \"\$msg_cancel\"  \
			--default-item \"\$defaultzone\" \
			--menu \"\$prompt\"              \
			$height $width $rows             \
			$menu_list                       \
			2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
		)
		retval=$?
		f_dialog_data_sanitize n
		defaultzone="$n"

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

		f_country $tlc cont_$n real_cont
		f_continent $real_cont name real_continent
		f_country $tlc name name
		f_country $tlc filename_$n filename

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

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

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

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