if [ ! "$_TIMEZONE_ZONES_SUBR" ]; then _TIMEZONE_ZONES_SUBR=1
#
# 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 (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.
#
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." timezone/zones.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/strings.subr
f_include $BSDCFG_SHARE/timezone/continents.subr

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

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

#
# Standard pathnames
#
_PATH_ZONETAB="/usr/share/zoneinfo/zone.tab"
_PATH_ZONEINFO="/usr/share/zoneinfo"
_PATH_LOCALTIME="/etc/localtime"
_PATH_DB="/var/db/zoneinfo"

#
# Export required i18n messages for awk(1) ENVIRON visibility
#
export msg_conflicting_zone_definition
export msg_country_code_invalid
export msg_country_code_unknown
export msg_invalid_country_code
export msg_invalid_format
export msg_invalid_region
export msg_invalid_zone_name
export msg_zone_multiply_defined
export msg_zone_must_have_description

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

# f_read_zones
#
# Read the zone descriptions database in _PATH_ZONETAB:
# 	/usr/share/zoneinfo/zone.tab on all OSes
#
# The format of this file (on all OSes) is:
# 	code	coordinates	TZ	comments
#
# With each of the following elements (described below) being separated by a
# single tab character:
#
# 	code
# 		The ISO 3166 2-character country code.
# 	coordinates
# 		Latitude and logitude of the zone's principal location in ISO
# 		6709 sign-degrees-minutes-seconds format, either +-DDMM+-DDDMM
# 		or +-DDMMSS+-DDDMMSS, first latitude (+ is north), then long-
# 		itude (+ is east).
# 	TZ
# 		Zone name used in value of TZ environment variable.
# 	comments
# 		Comments; present if and only if the country has multiple rows.
#
# Required variables [from continents.subr]:
#
# 	CONTINENTS
# 		Space-separated list of continents.
# 	continent_*_name
# 		Directory element in _PATH_ZONEINFO for the continent
# 		represented by *.
#
# Required variables [created by f_read_iso3166_table from iso3166.subr]:
#
# 	country_CODE_name
# 		Country name of the country represented by CODE, the 2-
# 		character country code.
#
# Variables created by this function:
#
# 	country_CODE_nzones
# 		Either set to `-1' to indicate that the 2-character country
# 		code has only a single zone associated with it (and therefore
# 		you should query the `country_CODE_*' environment variables),
# 		or set to `0' or higher to indicate how many zones are assoc-
# 		iated with the given country code. When multiple zones are
# 		configured for a single code, you should instead query the
# 		`country_CODE_*_N' environment variables (e.g., `echo
# 		$country_AQ_descr_1' prints the description of the first
# 		timezone in Antarctica).
# 	country_CODE_filename
# 		The ``filename'' portion of the TZ value that appears after the
# 		`/' (e.g., `Hong_Kong' from `Asia/Hong_Kong' or `Isle_of_Man'
# 		from `Europe/Isle_of_Man').
# 	country_CODE_cont
# 		The ``continent'' portion of the TZ value that appears before
# 		the `/' (e.g., `Asia' from `Asia/Hong_Kong' or `Europe' from
# 		`Europe/Isle_of_Man').
# 	country_CODE_descr
# 		The comments associated with the ISO 3166 code entry (if any).
#
# 	NOTE: CODE is the 2-character country code.
# 	
# This function is a two-parter. Below is the awk(1) portion of the function,
# afterward is the sh(1) function which utilizes the below awk script.
#
f_read_zones_awk='
# Variables that should be defined on the invocation line:
# 	-v progname="progname"
#
BEGIN {
	lineno = 0
	failed = 0

	#
	# Initialize continents array/map (name => id)
	#
	split(ENVIRON["CONTINENTS"], array, /[[:space:]]+/)
	for (item in array)
	{
		cont = array[item]
		if (!cont) continue
		name = ENVIRON["continent_" cont "_name"]
		continents[name] = cont
	}
}
function die(fmt, argc, argv)
{
	printf "f_die 1 \"%%s: %s\" \"%s\"", fmt, progname
	for (n = 1; n <= argc; n++)
		printf " \"%s\"", argv[n]
	print ""
	failed++
	exit 1
}
function find_continent(name)
{
	return continents[name]
}
function add_zone_to_country(lineno, tlc, descr, file, cont)
{
	#
	# Validate the two-character country code
	#
	if (!match(tlc, /^[A-Z][A-Z]$/))
	{
		argv[1] = FILENAME
		argv[2] = lineno
		argv[3] = tlc
		die(ENVRION["msg_country_code_invalid"], 3, argv)
	}
	if (!ENVIRON["country_" tlc "_name"])
	{
		argv[1] = FILENAME
		argv[2] = lineno
		argv[3] = tlc
		die(ENVIRON["msg_country_code_unknown"], 3, argv)
	}

	#
	# Add Zone to an array that we will parse at the end
	#
	if (length(descr) > 0)
	{
		if (country_nzones[tlc] < 0)
		{
			argv[1] = FILENAME
			argv[2] = lineno
			die(ENVIRON["msg_conflicting_zone_definition"], 2, argv)
		}

		n = ++country_nzones[tlc]
		country_cont[tlc,n] = cont
		country_filename[tlc,n] = file
		country_descr[tlc,n] = descr
	}
	else
	{
		if (country_nzones[tlc] > 0)
		{
			argv[1] = FILENAME
			argv[2] = lineno
			die(ENVIRON["msg_zone_must_have_description"], 2, argv)
		}
		if (country_nzones[tlc] < 0)
		{
			argv[1] = FILENAME
			argv[2] = lineno
			die(ENVIRON["msg_zone_multiply_defined"], 2, argv)
		}

		country_nzones[tlc] = -1
		country_cont[tlc] = cont
		country_filename[tlc] = file
	}
}
function print_country_code(tlc)
{
	nz = country_nzones[tlc]

	printf "country_%s_nzones=%d\n", tlc, nz
	printf "export country_%s_nzones\n", tlc

	if (nz < 0)
	{
		printf "country_%s_cont=\"%s\"\n", tlc, country_cont[tlc]
		printf "export country_%s_cont\n", tlc
		printf "country_%s_filename=\"%s\"\n",
		       tlc, country_filename[tlc]
	}
	else
	{
		n = 0
		while ( ++n <= nz )
		{
			printf "country_%s_cont_%d=\"%s\"\n",
			       tlc, n, country_cont[tlc,n]
			printf "export country_%s_cont_%d\n", tlc, n
			printf "country_%s_filename_%d=\"%s\"\n",
			       tlc, n, country_filename[tlc,n]
			printf "country_%s_descr_%d=\"%s\"\n",
			       tlc, n, country_descr[tlc,n]
		}
	}
}
/^#/ {
	lineno++
	next
}
!/^#/ {
	lineno++

	#
	# Split the current record (on TAB) into an array
	#
	if (split($0, line, /\t/) < 2)
	{
		argv[1] = FILENAME
		argv[2] = lineno
		die(ENVIRON["msg_invalid_format"], 2, argv)
	}

	# Get the ISO3166-1 (Alpha 1) 2-letter country code
	tlc = line[1]

	#
	# Validate the two-character country code
	#
	if (length(tlc) != 2)
	{
		argv[1] = FILENAME
		argv[2] = lineno
		argv[3] = tlc
		die(ENVIRON["msg_invalid_country_code"], 3, argv)
	}

	# Get the TZ field
	tz = line[3]

	#
	# Validate the TZ field
	#
	if (!match(tz, "/"))
	{
		argv[1] = FILENAME
		argv[2] = lineno
		argv[3] = tz
		die(ENVIRON["msg_invalid_zone_name"], 3, argv)
	}

	#
	# Get the continent portion of the TZ field
	#
	contbuf = tz
	sub("/.*$", "", contbuf)

	#
	# Validate the continent
	#
	cont = find_continent(contbuf)
	if (!cont)
	{
		argv[1] = FILENAME
		argv[2] = lineno
		argv[3] = contbuf
		die(ENVIRON["msg_invalid_region"], 3, argv)
	}

	#
	# Get the filename portion of the TZ field
	#
	filename = tz
	sub("^[^/]*/", "", filename)

	#
	# Calculate the substr start-position of the comment
	#
	descr_start = 0
	n = 4
	while (--n)
		descr_start += length(line[n]) + 1

	# Get the comment field
	descr = substr($0, descr_start + 1)

	add_zone_to_country(lineno, tlc, descr, filename, cont)
}
END {
	if (failed) exit failed
	for (tlc in country_nzones)
		print_country_code(tlc)
}
'
f_read_zones()
{
	eval $( awk -v progname="$pgm"   \
	            "$f_read_zones_awk"  \
	            "$_PATH_ZONETAB"     )
}

# f_install_zoneinfo_file $filename
#
# Installs a zone file to _PATH_LOCALTIME.
#
f_install_zoneinfo_file()
{
	local funcname=f_install_zoneinfo_file
	local zoneinfo_file="$1"
	local copymode title msg height width

	if [ -L "$_PATH_LOCALTIME" ]; then
		copymode=
	elif [ ! -e "$_PATH_LOCALTIME" ]; then
		# Nothing there yet...
		copymode=1
	else
		copymode=1
	fi

	if [ "$VERBOSE" ]; then
		if [ ! "$zoneinfo_file" ]; then
			f_sprintf msg "$msg_removing_file" "$_PATH_LOCALTIME"
		elif [ "$copymode" ]; then
			f_sprintf msg "$msg_copying_file" \
			              "$zoneinfo_file" "$_PATH_LOCALTIME"
		else
			f_sprintf msg "$msg_creating_symlink" \
			              "$_PATH_LOCALTIME" "$zoneinfo_file"
		fi
		if [ "$USEDIALOG" ]; then
			f_dialog_title "$msg_info"
			f_dialog_msgbox "$msg"
			f_dialog_title_restore
		else
			printf "%s\n" "$msg"
		fi
	fi

	[ "$REALLYDOIT" ] || return $SUCCESS

	local catch_args="-de"
	[ "$USEDIALOG" ] && catch_args=

	if [ ! "$zoneinfo_file" ]; then
		f_eval_catch $catch_args $funcname rm \
			'rm -f "%s"' "$_PATH_LOCALTIME" || return $FAILURE
		f_eval_catch $catch_args $funcname rm \
			'rm -f "%s"' "$_PATH_DB" || return $FAILURE

		if [ "$VERBOSE" ]; then
			f_sprintf msg "$msg_removed_file" "$_PATH_LOCALTIME"
			if [ "$USEDIALOG" ]; then
				f_dialog_title "$msg_done"
				f_dialog_msgbox "$msg"
				f_dialog_title_restore
			else
				printf "%s\n" "$msg"
			fi
		fi
		return $SUCCESS
	fi # ! zoneinfo_file

	if [ "$copymode" ]; then
		f_eval_catch $catch_args $funcname rm \
			'rm -f "%s"' "$_PATH_LOCALTIME" || return $FAILURE
		f_eval_catch $catch_args $funcname sh \
			'umask 222 && :> "%s"' "$_PATH_LOCALTIME" ||
			return $FAILURE
		f_eval_catch $catch_args $funcname sh \
			'cat "%s" > "%s"' \
			"$zoneinfo_file" "$_PATH_LOCALTIME" || return $FAILURE
	else
		f_eval_catch $catch_args $funcname sh \
			'( :< "%s" )' "$zoneinfo_file" || return $FAILURE
		f_eval_catch $catch_args $funcname rm \
			'rm -f "%s"' "$_PATH_LOCALTIME" || return $FAILURE
		f_eval_catch $catch_args $funcname ln \
			'ln -s "%s" "%s"' \
			"$zoneinfo_file" "$_PATH_LOCALTIME" || return $FAILURE
	fi # copymode

	if [ "$VERBOSE" ]; then
		if [ "$copymode" ]; then
			f_sprintf msg "$msg_copied_timezone_file" \
			              "$zoneinfo_file" "$_PATH_LOCALTIME"
		else
			f_sprintf msg "$msg_created_symlink" \
			              "$_PATH_LOCALTIME" "$zoneinfo_file"
		fi
		if [ "$USEDIALOG" ]; then
			f_dialog_title "$msg_done"
			f_dialog_msgbox "$msg"
			f_dialog_title_restore
		else
			printf "%s\n" "$msg"
		fi
	fi

	return $SUCCESS
}

# f_install_zoneinfo $zoneinfo
#
# Install a zoneinfo file relative to _PATH_ZONEINFO. The given $zoneinfo
# will be written to _PATH_DB (usable later with the `-r' flag).
#
f_install_zoneinfo()
{
	local zoneinfo="$1"
	local rv

	f_install_zoneinfo_file "$_PATH_ZONEINFO/$zoneinfo"
	rv=$?

	# Save knowledge for later
	if [ "$REALLYDOIT" -a $rv -eq $SUCCESS ]; then
		if true 2> /dev/null > "$_PATH_DB"; then
			cat <<-EOF > "$_PATH_DB"
			$zoneinfo
			EOF
		fi
	fi

	return $rv
}

# f_confirm_zone $filename
#
# Prompt the user to confirm the new timezone data. The first (and only)
# argument should be the pathname to the zoneinfo file, either absolute or
# relative to `/usr/share/zoneinfo' (e.g., "America/Los_Angeles").
#
# The return status is 0 if "Yes" is chosen, 1 if "No", and 255 if Esc is
# pressed (see dialog(1) for additional details).
# 
f_confirm_zone()
{
	local filename="$1"
	f_dialog_title "$msg_confirmation"
	local title="$DIALOG_TITLE" btitle="$DIALOG_BACKTITLE"
	f_dialog_title_restore
	local tm_zone="$( TZ="$filename" date +%Z )"
	local prompt # Calculated below
	local height=5 width=72

	f_sprintf prompt "$msg_look_reasonable" "$tm_zone"
	if [ "$USE_XDIALOG" ]; then
		height=$(( $height + 4 ))
		$DIALOG \
			--title "$title"         \
			--backtitle "$btitle"    \
			--ok-label "$msg_yes"    \
			--cancel-label "$msg_no" \
			--yesno "$prompt" $height $width
	else
		$DIALOG \
			--title "$title"       \
			--backtitle "$btitle"  \
			--yes-label "$msg_yes" \
			--no-label "$msg_no"   \
			--yesno "$prompt" $height $width
	fi
}

# f_set_zone_utc
#
# Resets to the UTC timezone.
#
f_set_zone_utc()
{
	f_confirm_zone "" || return $FAILURE
	f_install_zoneinfo_file ""
}

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

f_dprintf "%s: Successfully loaded." timezone/zones.subr

fi # ! $_TIMEZONE_ZONES_SUBR