from win32com.client import constants as c
import random
xsi = Application
XSIDialog = XSIFactory.CreateObject("XSIDial.XSIDialog")

def get_random_percentage(iterable, percentage):
    amount = int( float(len(iterable)) * (percentage/100.0) )
    return random.sample(iterable, amount)


def selectRandomComponents(coll, percentage, cmpType = 'ask'):
    allComponents = {
        'edges':[x for obj in coll for x in obj.ActivePrimitive.Geometry.Edges],
        'points':[x for obj in coll for x in obj.ActivePrimitive.Geometry.Points],
        'faces':[x for obj in coll for x in obj.ActivePrimitive.Geometry.Facets]
    }
    cmpTypes = allComponents.keys()
    if cmpType == 'ask':
        cmpType = cmpTypes[ XSIDialog.ComboEx('Component type?',cmpTypes,2) ]

    sample = get_random_percentage(allComponents[cmpType], percentage)
    xsi.SelectObj(sample)

def selectRandomObjects(coll, percentage):
    sample = get_random_percentage(coll, percentage)
    xsi.SelectObj(sample)


def main():
    selectComponents = (
        XSIUIToolkit.Msgbox(
        "Select components?\n\nYES = components\nNO = objects",
        c.siMsgYesNo+c.siMsgQuestion,
        "Random Selector" ) == c.siMsgYes
    )
    percentage = float(xsi.XSIInputBox(
        "What percentage to select?",
        "Selection percentage?",
        50 # default %
    ))
    if selectComponents:
        selectRandomComponents(xsi.Selection, percentage)
    else:
        selectRandomObjects(xsi.Selection, percentage)

main()