from .geo import Geo
from .geomesh import *
from .bones import *
import bpy.path
import bpy
import mathutils

def import_scale_coord(v, scale):
    return (v[0] * scale, v[1] * scale, v[2] * scale)
if 0:
    def import_fix_coord(v):
        return (v[0], v[2], -v[1])
    def import_fix_normal(v):
        return (-v[0], -v[2], v[1])
    def import_fix_winding(l):
        l = list(l)
        l.reverse()
        return l
else:
    def import_fix_coord(v):
        return (-v[0],  v[2], -v[1])
    def import_fix_normal(v):
        return ( v[0], -v[2],  v[1])
    def import_fix_winding(l):
        return l

def convert_model(geo_model, mesh_data, obj, scale):
    #Convert the geo_model into a GeoMesh.
    geomesh = geo_model.saveToGeoMesh()

    indices = [i for face in geomesh.face for i in import_fix_winding(face.vert_indexes)]
    texture_indices = [face.texture_index for face in geomesh.face]

    mesh_data.vertices.add(len(geomesh.geovertex))
    mesh_data.loops.add(len(indices))
    mesh_data.polygons.add(len(geomesh.face))

    coords = [c for v in geomesh.geovertex for c in import_scale_coord(import_fix_coord(v.coord), scale)]
    normals = [n for v in geomesh.geovertex for n in import_fix_normal(v.normal)]
    loop_totals = []
    loop_starts = []
    i = 0
    for f in geomesh.face:
        loop_totals.append(len(f.vert_indexes))
        loop_starts.append(i)
        i += loop_totals[-1]


    mesh_data.vertices.foreach_set("co", coords)
    mesh_data.vertices.foreach_set("normal", normals)
    mesh_data.loops.foreach_set("vertex_index", indices)
    mesh_data.polygons.foreach_set("loop_start", loop_starts)
    mesh_data.polygons.foreach_set("loop_total", loop_totals)
    mesh_data.polygons.foreach_set("material_index", texture_indices)
    #mesh_data.update()

    vgroup = {}
    for w_name in geomesh.weights:
        vgroup[w_name] = obj.vertex_groups.new(name=w_name)
    for i, v in enumerate(geomesh.geovertex):
        for w in v.weights:
            #print("vertex idx: %s  group: %s  weight: %s" % (i, w[0], w[1]))
            vgroup[w[0]].add([i], w[1], 'REPLACE')
    #for v in ob.vertices:
    #    weight_values.append( v.groups[o.vertex_groups[vg_name].index].weight )
    #???mesh_data.validate(False)

    d = mesh_data.uv_layers.new().data
    uvs = [c for f in geomesh.face for i in f.vert_indexes for c in geomesh.geovertex[i].uv]
    d.foreach_set('uv', uvs)



    mesh_data.validate()
    mesh_data.update()
    mesh_data.vertices.foreach_set("normal", normals)
    mesh_data.update()

    #todo: attempt to load textures/images


def load(operator, context, scale = 1.0, filepath = "", global_matrix = None, use_mesh_modifiers = True):
    #load .geo
    fh_in = open(filepath, "rb")
    geo = Geo()
    geo.loadFromFile(fh_in)
    fh_in.close()
    for geo_model in geo.models:
        #create object matching model's name (or next equivilant)
        mesh = bpy.data.meshes.new(name = geo_model.name.decode("utf-8"))
        obj = bpy.data.objects.new(geo_model.name.decode("utf-8"), mesh)
        #convert model to mesh
        convert_model(geo_model, mesh, obj, scale)
        #Create object for this mesh
        scn = bpy.context.scene

        bpy.context.collection.objects.link(obj)
        bpy.context.view_layer.objects.active = obj
        obj.select_set(True)
        pass
    pass
    return {'FINISHED'}