#!/bin/sh

## Includes.
. funcPlay
. funcStop
. functmpGet
. functmpSet
. funcWidgetSchedule

## Position on the previous/next track in the playlist.
## On entry: $1 = -1 for previous, 1 for next

funcPreviousNext() {
	if [ -z "$BASH" ]; then local FUNCNAME=funcPreviousNext; fi
	if [ $DEBUG_TRANSITS -ne 0 ]; then echo "$FUNCNAME: IN"; fi

	## Local variables.
	local playerstate=`functmpGet playerstate`
	local playlistindex=`functmpGet playlistindex`
	local playlistcount=`functmpGet playlistcount`
	local playlisttrack="`functmpGet playlisttrack`"
	local trackdir="${playlisttrack%/*}"
	local line

	if [ $playlistcount -gt 0 ]; then
		## Locate the previous/next track in the playlist.
		playlistindex=$(($playlistindex + $1))
		if [ $1 -eq -1 ]; then
			if [ $playlistindex -lt 0 ]; then
				playlistindex=$(($playlistcount - 1))
			fi
		else
			if [ $playlistindex -ge $playlistcount ]; then
				playlistindex=0
			fi
		fi
		line=$(($playlistindex + 1))
		playlisttrack="`sed -n ${line}p $TEMP_DIR/playlist`"
		functmpSet playlistindex $playlistindex
		functmpSet playlisttrack "$playlisttrack"

		## Stop a paused or playing track and auto-play the next.
		if [ $playerstate = paused -o $playerstate = playing ]; then
			funcStop
			funcPlay
		fi

		# Only refresh the cover(s) if the folder has changed.
		if [ "$trackdir" != "${playlisttrack%/*}" ]; then
			funcWidgetSchedule muiCoverRefreshCheck coverrefreshcheck
		fi

		# Always update the track info.
		funcWidgetSchedule muiTrackInfoRefreshCheck trackinforefreshcheck
	fi

	if [ $DEBUG_TRANSITS -ne 0 ]; then echo "$FUNCNAME: OUT"; fi
}