# -*- mode: tcl; indent-tabs-mode: nil -*- 

# ----------------------------------------------------------------------
#  COMPONENT: flowhints - represents a uniform rectangular 2-D mesh.
#
#  This object represents one field in an XML description of a device.
#  It simplifies the process of extracting data vectors that represent
#  the field.
# ======================================================================
#  AUTHOR:  Michael McLennan, Purdue University
#  Copyright (c) 2004-2012  HUBzero Foundation, LLC
#
#  See the file "license.terms" for information on usage and
#  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# ======================================================================

package require Itcl
package require BLT

namespace eval Rappture { 
    # empty
}

itcl::class Rappture::FlowHints {
    constructor {field cname units} { 
        # defined below 
    }
    destructor { 
        # defined below 
    }

    public method hints {}     { return [array get _hints] }
    public method particles {} { return $_particles }
    public method boxes {}     { return $_boxes }

    private method ConvertUnits { value }
    private method GetAxis { obj path varName }
    private method GetBoolean { obj path varName }
    private method GetCorner { obj path varName }
    private method GetPosition { obj path varName }
    private method GetSize { obj path varName }

    private variable _boxes "";         # List of boxes for the flow.
    private variable _particles "";     # List of particle injection planes.
    private variable _hints;            # Array of settings for the flow.
    private variable _units ""
}

# ----------------------------------------------------------------------
# Constructor
# ----------------------------------------------------------------------
itcl::body Rappture::FlowHints::constructor {field cname units} {
    if {[$field element $cname.flow] == ""} {
        puts stderr "no flow entry in $cname"
        return 
    }
    array set _hints {
        "axis"          "x"
        "description"   ""
        "outline"       "on"
        "position"      "0.0%"
        "streams"       "on"
        "arrows"        "off"
        "volume"        "on"
        "duration"      "1:00"
        "speed"         "1x"
    }
    set _units $units
    set f [$field element -as object $cname.flow]
    set _hints(name) [$field element -as id $cname.flow]
    foreach child [$f children] {
        set value [$f get $child]
        switch -glob -- $child {
            "label"       { set _hints(label) $value }
            "description" { set _hints(description) $value }
            "outline"     { GetBoolean $f $child _hints(outline) }
            "volume"      { GetBoolean $f $child _hints(volume) }
            "streams"     { GetBoolean $f $child _hints(streams) }
            "arrows"      { GetBoolean $f $child _hints(arrows) }
            "axis"        { GetAxis $f  $child _hints(axis) }
            "speed"       { set _hints(speed) $value }
            "duration"    { set _hints(duration) $value }
            "position"    { GetPosition $f $child _hints(position) }
            "particles*" {
                array unset data
                array set data {
                    "axis"          "x"
                    "color"         "blue"
                    "description"   ""
                    "hide"          "no"
                    "label"         ""
                    "position"      "0.0%"
                    "size"          "1.2"
                }
                set p [$f element -as object $child]
                set data(name) [$f element -as id $child]
                foreach child [$p children] {
                    set value [$p get $child]
                    switch -exact -- $child {
                        "axis"        { GetAxis $p axis data(axis) }
                        "color"       { set data(color) $value }
                        "description" { set data(description) $value }
                        "hide"        { GetBoolean $p hide data(hide) }
                        "label"       { set data(label) $value }
                        "position"    { GetPosition $p position data(position)}
                        "size"        { GetSize $p size data(size)}
                    }
                }
                if { $data(label) == "" } {
                    set data(label) $data(name)
                }
                itcl::delete object $p
                lappend _particles [array get data]
            }
            "box*" {
                array unset data
                array set data {
                    "color"         "green"
                    "description"   ""
                    "hide"          "no"
                    "label"         ""
                    "linewidth"     "2"
                }
                set b [$f element -as object $child]
                set name [$f element -as id $child]
                set count 0
                set data(name) $name
                set data(color) [$f get $child.color]
                foreach child [$b children] {
                    set value [$b get $child]
                    switch -glob -- $child {
                        "color"       { set data(color) $value }
                        "description" { set data(description) $value }
                        "hide"        { GetBoolean $b hide data(hide) }
                        "linewidth"   { GetSize $b linewidth data(linewidth) }
                        "label"       { set data(label) $value }
                        "corner*" { 
                            incr count
                            GetCorner $b $child data(corner$count)
                        }
                    }
                }
                if { $data(label) == "" } {
                    set data(label) $data(name)
                }
                itcl::delete object $b
                lappend _boxes [array get data]
            }
        }
    }
    itcl::delete  object $f
}

itcl::body Rappture::FlowHints::ConvertUnits { value } {
    set cmd Rappture::Units::convert
    set n  [scan $value "%g%s" number suffix] 
    if { $n == 2 } {
        if { $suffix == "%" } {
            return $value
        } else {
            return [$cmd $number -context $suffix -to $_units -units off]
        }
    } elseif { [scan $value "%g" number]  == 1 } {
        if { $_units == "" } {
            return $number
        }
        return [$cmd $number -context $_units -to $_units -units off]
    }
    return ""
}

itcl::body Rappture::FlowHints::GetPosition { obj path varName } {
    set value [$obj get $path]
    set pos [ConvertUnits $value]
    if { $pos == "" } {
        puts stderr "can't convert units \"$value\" of \"$path\""
    }
    upvar $varName position
    set position $pos
}

itcl::body Rappture::FlowHints::GetAxis { obj path varName } {
    set value [$obj get $path]
    set value [string tolower $value]
    switch -- $value {
        "x" - "y" - "z" {
            upvar $varName axis
            set axis $value
            return
        }
    }
    puts stderr "invalid axis \"$value\" in \"$path\""
}

itcl::body Rappture::FlowHints::GetCorner { obj path varName } {
    set value [$obj get $path]
    set coords ""
    if { [llength $value] != 3 } {
        puts stderr "wrong number of coordinates \"$value\" in \"$path\""
        return ""
    }
    foreach coord $value {
        set v [ConvertUnits $coord]
        if { $v == "" } {
            puts stderr "can't convert units \"$value\" of \"$path\""
            return ""
        }
        lappend coords $v
    }
    upvar $varName corner
    set corner $coords
}

itcl::body Rappture::FlowHints::GetBoolean { obj path varName } {
    set value [$obj get $path]
    if { [string is boolean $value] } {
        upvar $varName bool
        set bool [expr $value ? 1 : 0]
        return
    }
    puts stderr "invalid boolean \"$value\" in \"$path\""
}

itcl::body Rappture::FlowHints::GetSize { obj path varName } {
    set string [$obj get $path]
    if { [scan $string "%d" value] != 1 || $value < 0 } {
        puts stderr "can't get size \"$string\" of \"$path\""
        return
    }
    upvar $varName size
    set size $value
}