import xml.etree.ElementTree as ET
import xml.dom.minidom
import os

def update_xml(xmlin, xmlout):

    tree = ET.parse(xmlin)
    root = tree.getroot()

    mats = root.findall('Material')

    if not mats:
        print(xmlin + ' skipped (no Material section)')
        return

    for mat in mats:
        print(mat)
        texpat = None

        for param in mat:
            if param.attrib['Name'] in ['DiffuseTexture', 'NormalTexture', 'Texture']:
                texpat = param.text
                break

        if texpat == None:
            print(xmlin + ' skipped (no base textures)')
            return

        generate = [('ColorMetalTexture', 'cm'), ('NormalGlossTexture', 'ng'), ('AddMapsTexture', 'add')]
        pattern = [x[0] for x in generate]
        exists = filter(lambda x: x.attrib['Name'] in pattern , mat)
        exists = map(lambda x: x.attrib['Name'], exists)

        path, ext = os.path.splitext(texpat)
        texname = ('_'.join(path.split('_')[:-1]))

        last = None
        for name, suf in generate:
            if name not in exists:
                p = ET.SubElement(mat, 'Parameter')
                p.attrib['Name'] = name
                p.text = '%s_%s.dds' % (texname, suf)
                p.tail = '\n\t\t'
                last = p

        if last != None:
            last.tail = '\n\t'

            xmlf = xml.dom.minidom.parseString(ET.tostring(root))
            xmlf.writexml(open(xmlout,'w'))
            print('"%s" processed and saved as "%s"' % (xmlin, xmlout))

        print('"%s" skipped (textures already declared)' % xmlin)


for root, dirs, filenames in os.walk('.'):
    for f in filenames:

        x = os.path.join(root, f)
        xout = os.path.join(root, "out"+f)
        if os.path.splitext(f)[1] == '.xml' and not f.startswith("out"):
            update_xml(x, xout)