# BlenderBIM Add-on - OpenBIM Blender Add-on
# Copyright (C) 2020, 2021 Dion Moult <dion@thinkmoult.com>
#
# This file is part of BlenderBIM Add-on.
#
# BlenderBIM Add-on 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 3 of the License, or
# (at your option) any later version.
#
# BlenderBIM Add-on 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 BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.

import os
import bpy
import json
import addon_utils
import ifcopenshell.api.owner.settings
import blenderbim.bim
import blenderbim.tool as tool
import blenderbim.core.owner as core_owner
from bpy.app.handlers import persistent
from blenderbim.bim.ifc import IfcStore
from blenderbim.bim.module.owner.prop import get_user_person, get_user_organisation
from blenderbim.bim.module.model.data import AuthoringData
from blenderbim.bim.module.model.workspace import LIST_OF_TOOLS, TOOLS_TO_CLASSES_MAP
from mathutils import Vector
from math import cos, degrees
from typing import Union


cwd = os.path.dirname(os.path.realpath(__file__))
global_subscription_owner = object()


def name_callback(obj, data):
    try:
        obj.name
    except:
        # The object is invalid but somehow still has a callback. Clear all
        # msgbus subscriptions to prevent useless further triggers.
        bpy.msgbus.clear_by_owner(obj)
        return  # In case the object RNA is gone during an undo / redo operation
    # Blender names are up to 63 UTF-8 bytes
    if len(bytes(obj.name, "utf-8")) >= 63:
        return

    if isinstance(obj, bpy.types.Material):
        if obj.BIMObjectProperties.ifc_definition_id:
            IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id).Name = obj.name
        if obj.BIMMaterialProperties.ifc_style_id:
            IfcStore.get_file().by_id(obj.BIMMaterialProperties.ifc_style_id).Name = obj.name
        refresh_ui_data()
        return

    if not obj.BIMObjectProperties.ifc_definition_id:
        return

    if obj.BIMObjectProperties.is_renaming:
        obj.BIMObjectProperties.is_renaming = False
        return

    element = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
    if "/" in obj.name:
        object_name = obj.name
        element_name = obj.name.split("/", 1)[1]
    else:
        element_name = obj.name
        object_name = element.is_a() + f"/{element_name}"
        obj.name = object_name  # NOTE: doesn't trigger infinite recursion

    if element.is_a("IfcGridAxis"):
        element.AxisTag = object_name.split("/")[1]
        refresh_ui_data()

    if not element.is_a("IfcRoot"):
        return
    element.Name = element_name
    if obj.BIMObjectProperties.collection:
        obj.BIMObjectProperties.collection.name = object_name
    refresh_ui_data()


def color_callback(obj, data):
    if obj.BIMMaterialProperties.ifc_style_id:
        tool.Ifc.edit(obj)


def active_object_callback():
    refresh_ui_data()
    update_bim_tool_props()


def update_bim_tool_props():
    """update BIM Tools props (such as extrusion_depth, length and x_angle) when active object changes"""
    obj = bpy.context.active_object

    # bunch of checks to see if we're in a valid state
    if not obj:
        return
    mode = bpy.context.mode
    current_tool = bpy.context.workspace.tools.from_space_view3d_mode(mode)
    if not current_tool or current_tool.idname not in LIST_OF_TOOLS:
        return
    element = tool.Ifc.get_entity(obj)
    if not element:
        return
    representation = ifcopenshell.util.representation.get_representation(element, "Model", "Body", "MODEL_VIEW")
    if not representation:
        return

    props = bpy.context.scene.BIMModelProperties
    if element.is_a("IfcElementType") or element.is_a("IfcElement"):
        element_type = ifcopenshell.util.element.get_type(element)
        if element_type:
            is_bim_tool = current_tool.idname == "bim.bim_tool"
            if is_bim_tool:
                props.ifc_class = element_type.is_a()
            if is_bim_tool or TOOLS_TO_CLASSES_MAP.get(current_tool.idname) == element_type.is_a():
                props.relating_type_id = str(element_type.id())
    extrusion = tool.Model.get_extrusion(representation)
    if not extrusion:
        return

    def get_x_angle(extrusion):
        x, y, z = extrusion.ExtrudedDirection.DirectionRatios
        x_angle = Vector((0, 1)).angle_signed(Vector((y, z)))
        return x_angle

    si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
    if not AuthoringData.is_loaded:
        AuthoringData.load()

    if AuthoringData.data["active_material_usage"] == "LAYER2":
        x_angle = get_x_angle(extrusion)
        axis = tool.Model.get_wall_axis(obj)["reference"]
        props.extrusion_depth = extrusion.Depth * si_conversion * cos(x_angle)
        props.length = (axis[1] - axis[0]).length
        props.x_angle = x_angle

    elif AuthoringData.data["active_material_usage"] == "LAYER3":
        x_angle = get_x_angle(extrusion)
        props.x_angle = x_angle

    elif AuthoringData.data["active_material_usage"] == "PROFILE":
        props.extrusion_depth = extrusion.Depth * si_conversion


def active_material_index_callback(obj, data):
    refresh_ui_data()


def subscribe_to(obj, data_path, callback):
    try:
        subscribe_to = obj.path_resolve(data_path, False)
    except:
        return
    bpy.msgbus.subscribe_rna(
        key=subscribe_to,
        owner=obj,
        args=(
            obj,
            data_path,
        ),
        notify=callback,
        options={
            "PERSISTENT",
        },
    )


def refresh_ui_data():
    from blenderbim.bim import modules

    for name, value in modules.items():
        try:
            getattr(value, "data").refresh()
        except AttributeError:
            pass

        # TODO: deprecate prop purge functions and refactor into data classes.
        try:
            getattr(value, "prop").purge()
        except AttributeError:
            pass

    if isinstance(tool.Ifc.get(), ifcopenshell.sqlite):
        tool.Ifc.get().clear_cache()


@persistent
def loadIfcStore(scene):
    IfcStore.purge()
    refresh_ui_data()
    if not IfcStore.get_file():
        return
    IfcStore.get_schema()
    IfcStore.relink_all_objects()


@persistent
def undo_post(scene):
    if IfcStore.last_transaction != bpy.context.scene.BIMProperties.last_transaction:
        IfcStore.last_transaction = bpy.context.scene.BIMProperties.last_transaction
        IfcStore.undo(until_key=bpy.context.scene.BIMProperties.last_transaction)
        refresh_ui_data()
    tool.Ifc.rebuild_element_maps()


@persistent
def redo_post(scene):
    if IfcStore.last_transaction != bpy.context.scene.BIMProperties.last_transaction:
        IfcStore.last_transaction = bpy.context.scene.BIMProperties.last_transaction
        IfcStore.redo(until_key=bpy.context.scene.BIMProperties.last_transaction)
        refresh_ui_data()
    tool.Ifc.rebuild_element_maps()


def get_application(ifc):
    # TODO: cache this for even faster application retrieval. It honestly makes a difference on long scripts.
    version = get_application_version()
    for element in ifc.by_type("IfcApplication"):
        if element.ApplicationIdentifier == "BlenderBIM" and element.Version == version:
            return element
    return ifcopenshell.api.run(
        "owner.add_application",
        ifc,
        version=version,
        application_full_name="BlenderBIM Add-on",
        application_identifier="BlenderBIM",
    )


def get_application_version():
    return ".".join(
        [
            str(x)
            for x in [
                addon.bl_info.get("version", (-1, -1, -1))
                for addon in addon_utils.modules()
                if addon.bl_info["name"] == "BlenderBIM"
            ][0]
        ]
    )


def viewport_shading_changed_callback(area):
    shading = area.spaces.active.shading.type
    if shading == "RENDERED":
        bpy.context.scene.BIMStylesProperties.active_style_type = "External"


@persistent
def load_post(scene):
    global global_subscription_owner
    active_object_key = bpy.types.LayerObjects, "active"
    bpy.msgbus.subscribe_rna(
        key=active_object_key, owner=global_subscription_owner, args=(), notify=active_object_callback
    )

    # subscribe to changes in viewport shading mode
    # NOTE: couldn't find a way to make it work for new areas too
    # it starts working for them after blender restart though
    for screen in bpy.data.screens:
        for area in screen.areas:
            if area.type != "VIEW_3D":
                continue
            shading = area.spaces.active.shading
            key = shading.path_resolve("type", False)

            bpy.msgbus.subscribe_rna(
                key=key, owner=global_subscription_owner, args=(area,), notify=viewport_shading_changed_callback
            )

    ifcopenshell.api.owner.settings.get_user = lambda ifc: core_owner.get_user(tool.Owner)
    ifcopenshell.api.owner.settings.get_application = get_application
    AuthoringData.type_thumbnails = {}

    if not bpy.context.preferences.addons["blenderbim"].preferences.should_setup_toolbar:
        tool.Blender.unregister_toolbar()

    if bpy.context.preferences.addons["blenderbim"].preferences.should_setup_workspace:
        if "BIM" in bpy.data.workspaces:
            bpy.context.window.workspace = bpy.data.workspaces["BIM"]
        else:
            bpy.ops.workspace.append_activate(idname="BIM", filepath=os.path.join(cwd, "data", "workspace.blend"))

    # To improve usability for new users, we hijack the scene properties
    # tab. We override default scene properties panels with our own poll
    # to hide them unless the user has chosen to view Blender properties.
    for panel in tool.Blender.get_scene_panels_list():
        if panel in blenderbim.bim.original_scene_panels_polls:
            continue
        tool.Blender.override_scene_panel(panel)
    tool.Blender.setup_tabs()