# vim:ts=4:et
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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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#  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.
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#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

import bpy
from bpy_extras.object_utils import object_data_add
from mathutils import Vector,Matrix

from .quakepal import palette
from .mdl import MDL

def make_verts(mdl, framenum, subframenum=0):
    frame = mdl.frames[framenum]
    if frame.type:
        frame = frame.frames[subframenum]
    verts = []
    s = Vector(mdl.scale)
    o = Vector(mdl.scale_origin)
    m = Matrix(((s.x,  0,  0,  0),
                (  0,s.y,  0,  0),
                (  0,  0,s.z,  0),
                (o.x,o.y,o.z,  1)))
    for v in frame.verts:
        try:    #FIXME
            verts.append(Vector(v.r) * m)
        except ValueError:
            verts.append(m * Vector(v.r))
    return verts

def make_faces(mdl):
    faces = []
    uvs = []
    for tri in mdl.tris:
        tv = list(tri.verts)
        sts = []
        for v in tri.verts:
            stv = mdl.stverts[v]
            s = stv.s
            t = stv.t
            if stv.onseam and not tri.facesfront:
                s += mdl.skinwidth / 2
            # quake textures are top to bottom, but blender images
            # are bottom to top
            sts.append((s * 1.0 / mdl.skinwidth, 1 - t * 1.0 / mdl.skinheight))
        # blender's and quake's vertex order seem to be opposed
        tv.reverse()
        sts.reverse()
        # annoyingly, blender can't have 0 in the final vertex, so rotate the
        # face vertices and uvs
        if not tv[2]:
            tv = [tv[2]] + tv[:2]
            sts = [sts[2]] + sts[:2]
        faces.append (tv)
        uvs.append(sts)
    return faces, uvs

def load_skins(mdl):
    def load_skin(skin, name):
        img = bpy.data.images.new(name, mdl.skinwidth, mdl.skinheight)
        mdl.images.append(img)
        p = [0.0] * mdl.skinwidth * mdl.skinheight * 4
        d = skin.pixels
        for j in range(mdl.skinheight):
            for k in range(mdl.skinwidth):
                c = palette[d[j * mdl.skinwidth + k]]
                # quake textures are top to bottom, but blender images
                # are bottom to top
                l = ((mdl.skinheight - 1 - j) * mdl.skinwidth + k) * 4
                p[l + 0] = c[0] / 255.0
                p[l + 1] = c[1] / 255.0
                p[l + 2] = c[2] / 255.0
                p[l + 3] = 1.0
        img.pixels[:] = p[:]
        if hasattr(img, "pack"):
            img.pack(True)

    mdl.images=[]
    for i, skin in enumerate(mdl.skins):
        if skin.type:
            for j, subskin in enumerate(skin.skins):
                load_skin (subskin, "%s_%d_%d" % (mdl.name, i, j))
        else:
            load_skin (skin, "%s_%d" % (mdl.name, i))

def setup_skins (mdl, uvs):
    load_skins (mdl)
    img = mdl.images[0]   # use the first skin for now
    uvlay = mdl.mesh.uv_textures.new(mdl.name)
    for i, f in enumerate(uvlay.data):
        mdl_uv = uvs[i]
        for j, uv in enumerate(f.uv):
            uv[0], uv[1] = mdl_uv[j]
        f.image = img
        f.use_image = True
    mat = bpy.data.materials.new(mdl.name)
    mat.diffuse_color = (1,1,1)
    mat.use_raytrace = False
    tex = bpy.data.textures.new(mdl.name, 'IMAGE')
    tex.extension = 'CLIP'
    tex.use_preview_alpha = True
    tex.image = img
    mat.texture_slots.add()
    ts = mat.texture_slots[0]
    ts.texture = tex
    ts.use_map_alpha = True
    ts.texture_coords = 'UV'
    mdl.mesh.materials.append(mat)

def make_shape_key(mdl, framenum, subframenum=0):
    frame = mdl.frames[framenum]
    name = "%s_%d" % (mdl.name, framenum)
    if frame.type:
        frame = frame.frames[subframenum]
        name = "%s_%d_%d" % (mdl.name, framenum, subframenum)
    if frame.name:
        name = frame.name
    else:
        frame.name = name
    frame.key = mdl.obj.shape_key_add(name)
    frame.key.value = 0.0
    mdl.keys.append (frame.key)
    s = Vector(mdl.scale)
    o = Vector(mdl.scale_origin)
    m = Matrix(((s.x,  0,  0,  0),
                (  0,s.y,  0,  0),
                (  0,  0,s.z,  0),
                (o.x,o.y,o.z,  1)))
    for i, v in enumerate(frame.verts):
        try:    #FIXME
            frame.key.data[i].co = Vector(v.r) * m
        except ValueError:
            frame.key.data[i].co = m * Vector(v.r)

def build_shape_keys(mdl):
    mdl.keys = []
    mdl.obj.shape_key_add("Basis")
    for i, frame in enumerate(mdl.frames):
        frame = mdl.frames[i]
        if frame.type:
            for j in range(len(frame.frames)):
                make_shape_key(mdl, i, j)
        else:
            make_shape_key(mdl, i)

def set_keys(act, data):
    for d in data:
        key, co = d
        dp = """key_blocks["%s"].value""" % key.name
        fc = act.fcurves.new(data_path = dp)
        fc.keyframe_points.add(len(co))
        for i in range(len(co)):
            fc.keyframe_points[i].co = co[i]

def build_actions(mdl):
    sk = mdl.mesh.shape_keys
    for frame in mdl.frames:
        sk.animation_data_create()
        sk.animation_data.action = bpy.data.actions.new(frame.name)
        act=sk.animation_data.action
        data = []
        other_keys = mdl.keys[:]
        if frame.type:
            for j, subframe in enumerate(frame.frames):
                co = []
                if j > 1:
                    co.append ((1.0, 0.0))
                if j > 0:
                    co.append ((j * 1.0, 0.0))
                co.append (((j + 1) * 1.0, 1.0))
                if j < len(frame.frames) - 2:
                    co.append (((j + 2) * 1.0, 0.0))
                if j < len(frame.frames) - 1:
                    co.append ((len(frame.frames) * 1.0, 0.0))
                data.append((subframe.key, co))
                if subframe.key in other_keys:
                    del(other_keys[other_keys.index(subframe.key)])
            co = [(1.0, 0.0), (len(frame.frames) * 1.0, 0.0)]
            for k in other_keys:
                data.append((k, co))
        else:
            data.append((frame.key, [(1.0, 1.0)]))
            if frame.key in other_keys:
                del(other_keys[other_keys.index(frame.key)])
            co = [(1.0, 0.0)]
            for k in other_keys:
                data.append((k, co))
        set_keys (act, data)

def merge_frames(mdl):
    def get_base(name):
        i = 0
        while i < len(name) and name[i] not in "0123456789":
            i += 1
        return name[:i]

    i = 0
    while i < len(mdl.frames):
        if mdl.frames[i].type:
            i += 1
            continue
        base = get_base(mdl.frames[i].name)
        j = i + 1
        while j < len(mdl.frames):
            if mdl.frames[j].type:
                break
            if get_base(mdl.frames[j].name) != base:
                break
            j += 1
        f = MDL.Frame()
        f.name = base
        f.type = 1
        f.frames = mdl.frames[i:j]
        mdl.frames[i:j] = [f]
        i += 1

def import_mdl(operator, context, filepath):
    bpy.context.user_preferences.edit.use_global_undo = False

    for obj in bpy.context.scene.objects:
        obj.select = False

    mdl = MDL()
    if not mdl.read(filepath):
        operator.report({'ERROR'},
            "Unrecognized format: %s %d" % (mdl.ident, mdl.version))
        return {'CANCELLED'}
    faces, uvs = make_faces (mdl)
    verts = make_verts (mdl, 0)
    mdl.mesh = bpy.data.meshes.new(mdl.name)
    mdl.mesh.from_pydata(verts, [], faces)
    mdl.obj = bpy.data.objects.new(mdl.name, mdl.mesh)
    bpy.context.scene.objects.link(mdl.obj)
    bpy.context.scene.objects.active = mdl.obj
    mdl.obj.select = True
    setup_skins (mdl, uvs)
    if mdl.images and not hasattr(mdl.images[0], "pack"):
        operator.report({'WARNING'},
            "Unable to pack skins. They must be packed by hand."
            +" Some may have been lost")
    if len(mdl.frames) > 1 or mdl.frames[0].type:
        build_shape_keys(mdl)
        merge_frames(mdl)
        build_actions(mdl)

    mdl.mesh.update()

    bpy.context.user_preferences.edit.use_global_undo = True
    return {'FINISHED'}