#
# Copyright 2011, Blender Foundation.
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
#

# XML exporter for generating test files, not intended for end users

import os
import bpy
from bpy_extras.io_utils import ExportHelper
import xml.etree.ElementTree as etree
import xml.dom.minidom as dom

def strip(root):
    root.text = None
    root.tail = None

    for elem in root:
        strip(elem)

def write(node, fname):
    strip(node)

    s = etree.tostring(node)
    s = dom.parseString(s).toprettyxml()

    f = open(fname, "w")
    f.write(s)

class ExportCyclesXML(bpy.types.Operator, ExportHelper):
    ''''''
    bl_idname = "export_mesh.cycles_xml"
    bl_label = "Export Cycles XML"

    filename_ext = ".xml"

    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        filepath = bpy.path.ensure_ext(self.filepath, ".xml")

        # get mesh
        scene = context.scene
        object = context.object

        if not object:
            raise Exception("No active object")

        mesh = object.to_mesh(scene, True, 'PREVIEW')

        if not mesh:
            raise Exception("No mesh data in active object")

        # generate mesh node
        nverts = ""
        verts = ""
        P = ""

        for v in mesh.vertices:
            P += "%f %f %f  " % (v.co[0], v.co[1], v.co[2])

        for i, f in enumerate(mesh.faces):
            nverts += str(len(f.vertices)) + " "

            for v in f.vertices:
                verts += str(v) + " "
            verts += " "

        node = etree.Element('mesh', attrib={'nverts': nverts, 'verts': verts, 'P': P})
        
        # write to file
        write(node, filepath)

        return {'FINISHED'}

def register():
    pass

def unregister():
    pass

if __name__ == "__main__":
    register()