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#  This program is free software; you can redistribute it and/or
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#  as published by the Free Software Foundation; either version 2
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

"""
Blender-CoD: Blender Add-On for Call of Duty modding
Version: alpha 3

Copyright (c) 2011 CoDEmanX, Flybynyt -- blender-cod@online.de

http://code.google.com/p/blender-cod/

NOTES
- Code is in early state of development and work in progress!
- Importing rigs from XMODEL_EXPORT v6 works, but the code is really messy.

TODO
- Implement full xmodel import

"""

import os
import bpy
from mathutils import *
import math
#from mathutils.geometry import tesselate_polygon
#from io_utils import load_image, unpack_list, unpack_face_list

def round_matrix_3x3(mat, precision=6):
    return Matrix(((round(mat[0][0],precision), round(mat[0][1],precision), round(mat[0][2],precision)),
                (round(mat[1][0],precision), round(mat[1][1],precision), round(mat[1][2],precision)),
                (round(mat[2][0],precision), round(mat[2][1],precision), round(mat[2][2],precision))))

def load(self, context, filepath=""):

    filepath = os.fsencode(filepath)

    test_0 = []
    test_1 = []
    test_2 = []
    test_3 = []

    state = 0

    # placeholders
    vec0 = Vector((0.0, 0.0, 0.0))
    mat0 = Matrix(((0.0, 0.0, 0.0),(0.0, 0.0, 0.0),(0.0, 0.0, 0.0)))

    numbones = 0
    numbones_i = 0
    bone_i = 0
    bone_table = []
    numverts = 0
    vert_i = 0
    vert_table = [] # allocate table? [0]*numverts
    face_i = 0
    face_tmp = []
    face_table = []
    bones_influencing_num = 0
    bones_influencing_i = 0
    numfaces = 0

    print("\nImporting %s" % filepath)

    try:
        file = open(filepath, "r")
    except IOError:
        return "Could not open file for reading:\n%s" % filepath

    for line in file:
        line = line.strip()
        line_split = line.split()

        # Skip empty and comment lines
        if not line or line[0] == "/":
            continue

        elif state == 0 and line_split[0] == "MODEL":
            state = 1

        elif state == 1 and line_split[0] == "VERSION":
            if line_split[1] != "6":
                error_string = "Unsupported version: %s" % line_split[1]
                print("\n%s" % error_string)
                return error_string
            state = 2

        elif state == 2 and line_split[0] == "NUMBONES":
            numbones = int(line_split[1])
            state = 3

        elif state == 3 and line_split[0] == "BONE":
            if numbones_i != int(line_split[1]):
                error_string = "Unexpected bone number: %s (expected %i)" % (line_split[1], numbones_i)
                print("\n%s" % error_string)
                return error_string
            bone_table.append((line_split[3][1:-1], int(line_split[2]), vec0, mat0))
            test_0.append(line_split[3][1:-1])
            test_1.append(int(line_split[2]))
            if numbones_i >= numbones-1:
                state = 4
            else:
                numbones_i += 1

        elif state == 4 and line_split[0] == "BONE":
            bone_num = int(line_split[1])
            if bone_i != bone_num:
                error_string = "Unexpected bone number: %s (expected %i)" % (line_split[1], bone_i)
                print("\n%s" % error_string)
                return error_string
            state = 5

        elif state == 5 and line_split[0] == "OFFSET":
            # remove commas - line_split[#][:-1] would also work, but isn't as save
            line_split = line.replace(",", "").split()

            # should we check for len(line_split) to ensure we got enough elements?
            # Note: we can't assign a new vector to tuple object, we need to change each value

            bone_table[bone_i][2].xyz = Vector((float(line_split[1]), float(line_split[2]), float(line_split[3])))
            #print("\nPROBLEMATIC: %s" % bone_table[bone_i][2])
            #NO ERROR HERE, but for some reason the whole table will contain the same vectors
            #bone_table[bone_i][2][0] = float(line_split[1])
            #bone_table[bone_i][2][1] = float(line_split[2])
            #bone_table[bone_i][2][2] = float(line_split[3])
            test_2.append(Vector((float(line_split[1]),float(line_split[2]),float(line_split[3]))))

            state = 6

        elif state == 6 and line_split[0] == "SCALE":
            # always 1.000000?! no processing so far...
            state = 7

        elif state == 7 and line_split[0] == "X":
            line_split = line.replace(",", "").split()
            bone_table[bone_i][3][0] = Vector((float(line_split[1]), float(line_split[2]), float(line_split[3])))

            """ Use something like this:
            bone.align_roll(targetmatrix[2])
            roll = roll%360 #nicer to have it 0-359.99...
            """
            m_col = []
            m_col.append((float(line_split[1]), float(line_split[2]), float(line_split[3])))

            state = 8

        elif state == 8 and line_split[0] == "Y":
            line_split = line.replace(",", "").split()
            bone_table[bone_i][3][1] = Vector((float(line_split[1]), float(line_split[2]), float(line_split[3])))

            m_col.append((float(line_split[1]), float(line_split[2]), float(line_split[3])))

            state = 9

        elif state == 9 and line_split[0] == "Z":
            line_split = line.replace(",", "").split()
            vec_roll = Vector((float(line_split[1]), float(line_split[2]), float(line_split[3])))
            ##bone_table[bone_i][3][2] = vec_roll
            #print("bone_table: %s" % bone_table[bone_i][3][2])

            m_col.append((float(line_split[1]), float(line_split[2]), float(line_split[3])))

            #test_3.append(Vector(vec_roll))

            test_3.append(m_col)
            #print("test_3: %s\n\n" % test_3[:])

            if bone_i >= numbones-1:
                state = 10
            else:
                #print("\n---> Increasing bone: %3i" % bone_i)
                #print("\t" + str(bone_table[bone_i][3]))
                #print("\t" + str(bone_table[bone_i][0]))
                bone_i += 1
                state = 4

        elif state == 10 and line_split[0] == "NUMVERTS":
            numverts = int(line_split[1])
            state = 11

        elif state == 11 and line_split[0] == "VERT":
            vert_num = int(line_split[1])
            if vert_i != vert_num:
                error_string = "Unexpected vertex number: %s (expected %i)" % (line_split[1], vert_i)
                print("\n%s" % error_string)
                return error_string
            vert_i += 1
            state = 12

        elif state == 12 and line_split[0] == "OFFSET":
            line_split = line.replace(",", "").split()
            vert_table.append(Vector((float(line_split[1]), float(line_split[2]), float(line_split[3]))))
            state = 13

        elif state == 13 and line_split[0] == "BONES":
            # TODO: process
            bones_influencing_num = int(line_split[1])
            state= 14

        elif state == 14 and line_split[0] == "BONE":
            # TODO: add bones to vert_table
            if bones_influencing_i >= bones_influencing_num-1:
                if vert_i >= numverts:
                    state = 15
                else:
                    state = 11
            else:
                bones_influencing_i += 1
                #state = 14

        elif state == 15 and line_split[0] == "NUMFACES":
            numfaces = int(line_split[1])
            state = 16

        elif state == 16: #and line_split[0] == "TRI":
            #face_i += 1
            face_tmp = []
            state = 17

        elif (state == 17 or state == 21 or state == 25) and line_split[0] == "VERT":
            #print("face_tmp length: %i" % len(face_tmp))
            face_tmp.append(int(line_split[1]))
            state += 1

        elif (state == 18 or state == 22 or state == 26) and line_split[0] == "NORMAL":
            state += 1

        elif (state == 19 or state == 23 or state == 27) and line_split[0] == "COLOR":
            state += 1

        elif (state == 20 or state == 24 or state == 28) and line_split[0] == "UV":
            state += 1

        elif state == 29:

            #print("Adding face: %s\n%i faces so far (of %i)\n" % (str(face_tmp), face_i, numfaces))
            face_table.append(face_tmp)
            if (face_i >= numfaces - 1):
                state = 30
            else:
                face_i += 1
                face_tmp = []
                state = 17

        elif state > 15 and state < 30 and line_split[0] == "NUMOBJECTS":
            print("Bad numfaces, terminated loop\n")
            state = 30

        elif state == 30:
            print("Adding mesh!")
            me = bpy.data.meshes.new("pymesh")
            me.from_pydata(vert_table, [], face_table)
            me.update()
            ob = bpy.data.objects.new("Py-Mesh", me)
            bpy.context.collection.objects.link(ob)

            state = 31

        else: #elif state == 16:
            #UNDONE
            print("eh? state is %i line: %s" % (state, line))
            pass

        #print("\nCurrent state=" + str(state) + "\nLine:" + line)

    #print("\n" + str(list(bone_table)) + "\n\n" + str(list(vert_table)))

    #createRig(context, "Armature", Vector((0,0,0)), bone_table)

    name = "Armature"
    origin = Vector((0,0,0))
    boneTable = bone_table

    # If no context object, an object was deleted and mode is 'OBJECT' for sure
    if context.object: #and context.mode is not 'OBJECT':

        # Change mode, 'cause modes like POSE will lead to incorrect context poll
        bpy.ops.object.mode_set(mode='OBJECT')

    # Create armature and object
    bpy.ops.object.add(
        type='ARMATURE',
        enter_editmode=True,
        location=origin)
    ob = bpy.context.object
    ob.show_in_front = True
    ob.name = name
    amt = ob.data
    amt.name = name + "Amt"
    #amt.show_axes = True

    # Create bones
    bpy.ops.object.mode_set(mode='EDIT')
    #for (bname, pname, vector, matrix) in boneTable:
    #i = 0
    for (t0, t1, t2, t3) in zip(test_0, test_1, test_2, test_3):

        t3 = Matrix(t3)

        bone = amt.edit_bones.new(t0)
        if t1 != -1:
            parent = amt.edit_bones[t1]
            bone.parent = parent
            bone.head = parent.tail

            bone.align_roll((parent.matrix.to_3x3()*t3)[2])
            #local_mat = parent.matrix.to_3x3() * t3()
            #bone.align_roll(local_mat[2])
            from math import degrees
            print("t3[2]: %s\nroll: %f\n---------" % (t3.col[2], degrees(bone.roll)))
            #bone.roll = math.radians(180 - math.degrees(bone.roll))
            #print("###\nalign_roll: %s\nroll: %.2f\ntest_3:%s" % (t3, math.degrees(bone.roll), list(test_3)))
            bone.use_connect = True
        else:
            bone.head = (0,0,0)
            rot = Matrix.Translation((0,0,0))	# identity matrix
            bone.align_roll(t3[2])
            bone.use_connect = False
        bone.tail = t2

    file.close()

"""
def createRig(context, name, origin, boneTable):

    # If no context object, an object was deleted and mode is 'OBJECT' for sure
    if context.object: #and context.mode is not 'OBJECT':

        # Change mode, 'cause modes like POSE will lead to incorrect context poll
        bpy.ops.object.mode_set(mode='OBJECT')

    # Create armature and object
    bpy.ops.object.add(
        type='ARMATURE',
        enter_editmode=True,
        location=origin)
    ob = bpy.context.object
    ob.show_in_front = True
    ob.name = name
    amt = ob.data
    amt.name = name + "Amt"
    #amt.show_axes = True

    # Create bones
    bpy.ops.object.mode_set(mode='EDIT')
    #for (bname, pname, vector, matrix) in boneTable:
    #i = 0
    for i in range(len(test_0)):
        t0 = test_0[i]
        t1 = test_1[i]
        t2 = test_2[i]
        t3 = test_3[i]

        bone = amt.edit_bones.new(t0)
        if t1 != -1:
            parent = amt.edit_bones[t1]
            bone.parent = parent
            bone.head = parent.tail
            bone.use_connect = True
            bone.align_roll(t3)
            #print("align_roll: %s\nroll: %.2f" % (t3, math.degrees(bone.roll)))
            #(trans, rot, scale) = parent.matrix.decompose()
        else:
            bone.head = (0,0,0)
            rot = Matrix.Translation((0,0,0))	# identity matrix
            bone.use_connect = False
        #bone.tail = Vector(vector) * rot + bone.head
        bone.tail = t2
        #bone.tail = boneTable[i][2] #passing boneTable as parameter seems to break it :(
        #i += 1

    #outfile.write("\n%s" % str(boneTable))

    bpy.ops.object.mode_set(mode='OBJECT')
    return ob
"""
