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proc RSgetSeats { file } {
    set seats ""
    set fileId [open $file ]
    while { 1 } {
	set line [gets $fileId]
	if { [eof $fileId] } { break }
	set location [string first " #" $line]
	incr location -1
	if { $location > 0 } { set line [string range $line 0 $location] }
	set line [string trim $line]
	lappend seats $line
    }
    return $seats
}

proc RSprocessSeats { seats moveVar unmoveVar } {
    upvar $moveVar move
    upvar $unmoveVar unmove
    set length [llength $seats]
    for {set i 0} {$i < $length} {incr i} {
	set seat [lindex $seats $i]
	if { [set location [string first " !" $seat]] > 0 } {
	    incr location -1
	    set seat [string trim [string range $seat 0 $location] ]
	    set unmove($i) $seat
	} else {
	    lappend move $seat
	}
    }
}

proc RSdoAssignment { movable unmovableVar outputfile } {
    upvar $unmovableVar unmovable
    
    set fileId [open $outputfile "w"]
    set totallength [expr {[llength $movable] + [llength [array names unmovable]]}]
    for { set i 0 } { $i < $totallength } { incr i } {
	if { [set which [lsearch [array names unmovable] $i]] != -1} {
	    set which [lindex [array names unmovable] $which]
	    set seat $unmovable($which)
	    unset unmovable($which)
	} else {
	    set which [expr int(rand() * [llength $movable])]
	    set seat [lindex $movable $which]
	    set movable [lreplace $movable $which $which]
	}
	puts $fileId $seat
    }
    close $fileId
}

proc RSassign {file output seed} {
    set move ""
    expr srand($seed)
    RSprocessSeats [RSgetSeats $file] move unmove
    RSdoAssignment $move unmove $output
}

proc RSopenFile { num which } {
    global gRS
    set gRS($num.$which) [tk_getOpenFile]
}

proc RSsaveFile { num which } {
    global gRS
    set gRS($num.$which) [tk_getSaveFile]
}

proc RSrun { num } {
    global gRS
    RSassign $gRS($num.file) $gRS($num.output) $gRS($num.seed)
    displayMessage "Done"
}

proc RSstart {num} {
    global gRS
    set gRS($num.file) ""
    set gRS($num.output) ""
    set gRS($num.seed) 100

    set window [toplevel .randomSeating$num]

    set infoFrame [frame $window.infoFrame]
    set pathFrame [frame $window.pathFrame]
    set seedFrame [frame $window.seedFrame]
    set buttonFrame [frame $window.buttonFrame]
    pack $infoFrame $pathFrame $seedFrame $buttonFrame

    set inputFrame [frame $pathFrame.inputFrame]
    set outputFrame [frame $pathFrame.outputFrame]
    pack $inputFrame $outputFrame

    label $inputFrame.label -text "Input File:"
    set ientryFrame [frame $inputFrame.ientryFrame]
    button $inputFrame.select -text "Select File" \
	-command "RSopenFile $num file"
    pack $inputFrame.label $ientryFrame $inputFrame.select -side left
    entry $ientryFrame.entry -textvariable gRS($num.file) \
	    -xscrollcommand "$ientryFrame.scroll set"
    scrollbar $ientryFrame.scroll -orient h -command \
	    "$ientryFrame.entry xview"
    pack $ientryFrame.entry $ientryFrame.scroll
    pack configure $ientryFrame.scroll -fill x

    label $outputFrame.label -text "Output File:"
    set oentryFrame [frame $outputFrame.oentryFrame]
    button $outputFrame.select -text "Select File" \
	-command "RSsaveFile $num output"
    pack $outputFrame.label $oentryFrame $outputFrame.select -side left
    entry $oentryFrame.entry -textvariable gRS($num.output) \
	    -xscrollcommand "$oentryFrame.scroll set"
    scrollbar $oentryFrame.scroll -orient h -command \
	    "$oentryFrame.entry xview"
    pack $oentryFrame.entry $oentryFrame.scroll
    pack configure $oentryFrame.scroll -fill x

    scale $seedFrame.seed -from 1 -to 30000 -variable gRS($num.seed) \
	-label "Random number seed" -orient h -length 300
    pack $seedFrame.seed

    button $buttonFrame.assign -text Assign -command "RSrun $num"
    button $buttonFrame.exit -text "Exit" -command \
	"unset gRS($num.file); unset gRS($num.output); unset gRS($num.seed); destroy $window"
    pack $buttonFrame.assign $buttonFrame.exit -side left
}