#compdef zpool

_zpool() {
	local -a subcmds fields

	subcmds=(
		  create destroy add remove list iostat status online
		  offline clear attach detach replace scrub import export 
		  upgrade history get set
	)

	fields=(
		name\:"Pool name" size\:"Total size" used\:"Space used"
		available\:"Space available" capacity\:"Space used (percentage)"
		health\:"Health status"
	)

	properties=(
		"bootfs:value:"
		"autoreplace:value:(on off)"
		"delegation:value:(on off)"
	)
	propnames=( ${properties%%:*} )

	import_properties=(
		xattr
		copies
		shareiscsi
		canmount
		share
		sharenfs
		userprop
		mount
	)

	if [[ $service == "zpool" ]]; then
		_arguments -C -A "-*" \
			'-\?[help]' \
			'*::command:->subcmd' && return 0

		if (( CURRENT == 1 )); then
			_wanted commands expl "zpool subcommand" compadd -a subcmds
			return
		fi
		service="$words[1]"
		curcontext="${curcontext%:*}=$service:"
	fi

	case $service in
	(clear)
		_arguments \
			':pool name:_zfs_pool' \
			'*:virtual device:_files'
		;;

	(create)
		# TODO: investigate better vdev handling
		_arguments -A "-*" \
			'-f[force use of in-use devices]' \
			'-n[display configuration without creating pool]' \
			'-R[use alternate root]:alternate root:_files -/' \
			'-m[set mountpoint for root dataset]:mountpoint:' \
			':pool name:' \
			'*:virtual device:_files'
		;;

	(destroy)
		_arguments -A "-*" \
			'-f[force active datasets to be unmounted]' \
			':pool name:_zfs_pool'
		;;

	(add)
		_arguments -A "-*" \
			'-f[force use of in-use devices]' \
			'-n[display configuration without modifying pool]' \
			':pool name:_zfs_pool' \
			'*:virtual device:_files'
		;;

	(list)
		_arguments \
			'-H[scripted mode]' \
			'-o[fields to list]:field:_values -s , "field" ${^fields/\:/[}\]' \
			'::pool name:_zfs_pool'
		;;

	(iostat)
		_arguments -A "-*" \
			'-v[verbose statistics]' \
			'*::pool name:_zfs_pool' \
			'::interval:' \
			'::count:'
		;;

	(status)
		_arguments -A "-*" \
			'-v[verbose information]' \
			'-x[show only unhealthy pools]' \
			'*::pool name:_zfs_pool'
		;;

	(offline)
		_arguments -A "-*" \
			'-t[offline until next reboot]' \
			':pool name:_zfs_pool' \
			'*:virtual device:_files'
		;;

	(online)
		_arguments \
			':pool name:_zfs_pool' \
			'*:virtual device:_files'
		;;

	(attach)
		# TODO: first device should choose first from existing.
		_arguments \
			'-f[force attach, even if in use]' \
			':pool name:_zfs_pool' \
			':virtual device:_files' \
			':virtual device:_files'
		;;

	(detach)
		_arguments \
			':pool name:_zfs_pool' \
			':virtual device:_files'
		;;

	(replace)
		_arguments -A "-*" \
			'-f[force attach, even if in use]' \
			':pool name:_zfs_pool' \
			':virtual device:_files' \
			'::virtual device:_files'
		;;

	(scrub)
		_arguments -A "-*" \
			'-s[stop scrubbing]' \
			'*:pool name:_zfs_pool'
		;;

	(export)
		_arguments -A "-*" \
			'-f[forcefully unmount all datasets]' \
			'*:pool name:_zfs_pool'
		;;

	(import)
		# TODO: -o should complete options
		_arguments -A "-*" \
			'*-d[search for devices or files in directory]:_files -/' \
			'-D[destroyed pools]' \
			'-f[force import]' \
			- set1 \
			'-o[mount options]' \
			'-p[set property]:property:_values -s , "property" $import_properties' \
			'-R[alternate root]:_files -/' \
			'*:pool name or id:_zfs_pool' \
			'::new pool name:' \
			- set2 \
			'-a[all pools]'
		;;

	(get)
		_arguments -A "-*" \
			':property:_values -s , "property" $propnames all' \
			'*:pool name:_zfs_pool'
		;;

	(set)
		_arguments -A "-*" \
			':property:_values -s , "property" $properties' \
			'*:pool name:_zfs_pool'
		;;

	(upgrade)
		_arguments -A "-*" \
			- set1 \
			'-v[display ZFS versions and descriptions]' \
			- set2 \
			'-a[upgrade all pools]' \
			'*:pool name:_zfs_pool'
		;;

	(history)
		_arguments -A "-*" \
			'-i[display internal events]' \
			'-l[long format]' \
			'*:pool name:_zfs_pool'
		;;

	(*)
		_message "unknown zpool subcommand: $service"
		;;
	esac
}

_zpool "$@"