# Copyright (C) 2001-2007 Tresys Technology, LLC
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

namespace eval Apol_Widget {
    variable vars
}

# Creates a widget that lets the user select an MLS range and a range
# search type (exact, subset, superset).  If the second argument is
# not "" then add a checkbutton that enables/disables the entire
# widget.
proc Apol_Widget::makeRangeSelector {path rangeMatchText {enableText "MLS range"} args} {
    variable vars
    array unset vars $path:*
    set vars($path:range) {}
    set vars($path:range_rendered) {}
    set vars($path:search_type) $::APOL_QUERY_EXACT

    set f [frame $path]
    set range_frame [frame $f.range]
    set range2_frame [frame $f.range2]
    pack $range_frame $range2_frame -side left -expand 0 -anchor nw

    if {$enableText != {}} {
        set vars($path:enable) 0
        set range_cb [checkbutton $range_frame.enable -text $enableText \
                          -variable Apol_Widget::vars($path:enable)]
        pack $range_cb -side top -expand 0 -anchor nw
        trace add variable Apol_Widget::vars($path:enable) write [list Apol_Widget::_toggle_range_selector $path $range_cb]
    }
    set range_display [eval Entry $range_frame.display -textvariable Apol_Widget::vars($path:range_rendered) -width 20 -editable 0 $args]
    set range_button [button $range_frame.button -text "Select Range..." -state disabled -command [list Apol_Widget::_show_mls_range_dialog $path]]
    trace add variable Apol_Widget::vars($path:range) write [list Apol_Widget::_update_range_display $path]
    pack $range_display -side top -expand 1 -fill x -anchor nw
    pack $range_button -side top -expand 0 -anchor ne
    if {$enableText != {}} {
        pack configure $range_display -padx 4
        pack configure $range_button -padx 4
    }

    # range search type
    set range_label [label $range2_frame.label -text "Range matching:" \
                         -state disabled]
    set range_exact [radiobutton $range2_frame.exact -text "Exact matches" \
                         -state disabled \
                         -value $::APOL_QUERY_EXACT \
                         -variable Apol_Widget::vars($path:search_type)]
    set range_subset [radiobutton $range2_frame.subset -text "$rangeMatchText containing range" \
                          -state disabled \
                          -value $::APOL_QUERY_SUB \
                          -variable Apol_Widget::vars($path:search_type)]
    set range_superset [radiobutton $range2_frame.superset -text "$rangeMatchText within range" \
                            -state disabled \
                            -value $::APOL_QUERY_SUPER \
                            -variable Apol_Widget::vars($path:search_type)]
    pack $range_label $range_exact $range_subset $range_superset \
        -side top -expand 0 -anchor nw

    return $f
}

proc Apol_Widget::setRangeSelectorState {path newState} {
    if {$newState == 0 || $newState == "disabled"} {
        set new_state disabled
    } else {
        set new_state normal
    }
    foreach w {display button} {
        $path.range.$w configure -state $new_state
    }
    foreach w {label exact subset superset} {
        $path.range2.$w configure -state $new_state
    }
}

proc Apol_Widget::setRangeSelectorCompleteState {path newState} {
    if {$newState == 0 || $newState == "disabled"} {
        set new_state disabled
    } else {
        set new_state normal
    }
    catch {$path.range.enable configure -state $new_state}
}

proc Apol_Widget::clearRangeSelector {path} {
    set Apol_Widget::vars($path:range) {}
    set Apol_Widget::vars($path:search_type) $::APOL_QUERY_EXACT
    catch {set Apol_Widget::vars($path:enable) 0}
}

proc Apol_Widget::getRangeSelectorState {path} {
    return $Apol_Widget::vars($path:enable)
}

# Return a 2-uple containing the range value (an instance of an
# apol_mls_range_t) and the search type (one of APOL_QUERY_EXACT,
# APOL_QUERY_SUB, or APOL_QUERY_SUPER).  Caller must delete the range
# afterwards.  Note that the range could be an empty string if none is
# set.
proc Apol_Widget::getRangeSelectorValue {path} {
    variable vars
    if {$vars($path:range) != {}} {
        set range [new_apol_mls_range_t $vars($path:range)]
    } else {
        set range {}
    }
    list $range $vars($path:search_type)
}

########## private functions below ##########

proc Apol_Widget::_toggle_range_selector {path cb name1 name2 op} {
    if {$Apol_Widget::vars($path:enable)} {
        Apol_Widget::setRangeSelectorState $path normal
    } else {
        Apol_Widget::setRangeSelectorState $path disabled
    }
}

proc Apol_Widget::_show_mls_range_dialog {path} {
    $path.range.button configure -state disabled
    set range [Apol_Range_Dialog::getRange $Apol_Widget::vars($path:range)]
    if {$range != {}} {
        set Apol_Widget::vars($path:range) $range
        $range -acquire
    }
    
    $path.range.button configure -state normal
    # the trace on this variable will trigger [_update_range_display]
    # to execute
}

proc Apol_Widget::_update_range_display {path name1 name2 op} {
    variable vars
    set display $path.range.display
    if {$vars($path:range) == {}} {
        set vars($path:range_rendered) {}
        $display configure -helptext {}
    } else {
        set s [$vars($path:range) render $::ApolTop::policy]
        set vars($path:range_rendered) $s
        $display configure -helptext $vars($path:range_rendered)
    }
}