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#
#  This program 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 2
#  of the License, or (at your option) any later version.
#
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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>

"""User interface imports and preferences for the addon."""

# import addon_utils
# from time import sleep
import bpy
import os

from bpy.app.handlers import persistent
from pathlib import Path

# from bpy.utils import register_class, unregister_class
# from bpy.types import (
# Operator,
# Menu,
# UIList,
# Panel,
# Brush,
# Material,
# Light,
# World,
# ParticleSettings,
# FreestyleLineStyle,
# )

# from bl_operators.presets import AddPresetBase

from . import (
    render_gui,
    scenography_gui,
    object_gui,
    shading_gui,
    texturing_gui,
    shading_nodes,  # for POV specific nodes
    scripting_gui,
    update_files,
)


# ------------ POV-Centric WORKSPACE ------------ #
@persistent
def pov_centric_moray_like_workspace(dummy):
    """Set up a POV centric Workspace if addon was activated and saved as default renderer.

    This would bring a ’_RestrictData’ error because UI needs to be fully loaded before
    workspace changes so registering this function in bpy.app.handlers is needed.
    By default handlers are freed when loading new files, but here we want the handler
    to stay running across multiple files as part of this add-on. That is why the
    bpy.app.handlers.persistent decorator is used (@persistent) above.
    """
    # Scripting workspace may have been altered from factory though, so should
    # we put all within a Try... Except AttributeErrors ? Any better solution ?
    # Should it simply not run when opening existing file? be a preferences operator to create
    # Moray like workspace
    
    available_workspaces = bpy.data.workspaces
    
    if all(tabs in available_workspaces for tabs in ['POV-Mo', 'POV-Ed']):
        print("\nPOV-Mo and POV-Ed tabs respectively provide GUI and TEXT\n"
              "oriented POV workspaces akin to Moray and POVWIN")
    else:
        if 'POV-Ed'not in available_workspaces:
            print(
                "\nTo use POV centric workspaces you can set POV render option\n"
                "and save it with File > Defaults > Save Startup File menu"
            )
            try:
                if all(othertabs not in available_workspaces for othertabs in ['Geometry Nodes', 'POV-Ed']):
                    bpy.ops.workspace.append_activate(
                        idname='Geometry Nodes',
                        filepath=os.path.join(bpy.utils.user_resource('CONFIG'), 'startup.blend')
                    )
            except BaseException as e:
                print(e.__doc__)
                print('An exception occurred: {}'.format(e))
                try:
                    # Last resort: try to import from the blender templates
                    for p in Path(next(bpy.utils.app_template_paths())).rglob("startup.blend"):
                        bpy.ops.workspace.append_activate(
                            idname=self.targetWorkspace,
                            filepath=str(p))
                except BaseException as e:
                    print(e.__doc__)
                    print('An exception occurred: {}'.format(e))
                    # Giving up as prerequisites can't be found
                    print(
                        "\nFactory Geometry Nodes workspace needed for POV text centric"
                        "\nworkspace to activate when POV is set as default renderer"
                    )
            finally:
                # Create POVWIN like editor (text oriented editing)
                if 'POV-Ed' not in available_workspaces and 'Geometry Nodes' in available_workspaces:
                    wsp = available_workspaces.get('Geometry Nodes')
                    context = bpy.context
                    if context.scene.render.engine == 'POVRAY_RENDER' and wsp is not None:
                        bpy.ops.workspace.duplicate({'workspace': wsp})
                        available_workspaces['Geometry Nodes.001'].name = 'POV-Ed'
                        # May be already done, but explicitly make this workspace the active one
                        context.window.workspace = available_workspaces['POV-Ed']
                        pov_screen = available_workspaces['POV-Ed'].screens[0]
                        pov_workspace = pov_screen.areas
                        pov_window = context.window
                        # override = bpy.context.copy()  # crashes
                        override = {}
                        properties_area = pov_workspace[0]
                        nodes_to_3dview_area = pov_workspace[1]
                        view3d_to_text_area = pov_workspace[2]
                        spreadsheet_to_console_area = pov_workspace[3]

                        try:
                            nodes_to_3dview_area.ui_type = 'VIEW_3D'
                            override['window'] = pov_window
                            override['screen'] = bpy.context.screen
                            override['area'] = nodes_to_3dview_area
                            override['region'] = nodes_to_3dview_area.regions[-1]
                            bpy.ops.screen.space_type_set_or_cycle(
                                override, 'INVOKE_DEFAULT', space_type='VIEW_3D'
                            )
                            space = nodes_to_3dview_area.spaces.active
                            space.region_3d.view_perspective = 'CAMERA'

                            override['window'] = pov_window
                            override['screen'] = bpy.context.screen
                            override['area'] = view3d_to_text_area
                            override['region'] = view3d_to_text_area .regions[-1]
                            override['scene'] = bpy.context.scene
                            override['space_data'] = view3d_to_text_area .spaces.active
                            bpy.ops.screen.space_type_set_or_cycle(
                                override, 'INVOKE_DEFAULT', space_type='TEXT_EDITOR'
                            )
                            view3d_to_text_area.spaces.active.show_region_ui = True

                            spreadsheet_to_console_area.ui_type = 'CONSOLE'
                            override['window'] = pov_window
                            override['screen'] = bpy.context.screen
                            override['area'] = spreadsheet_to_console_area
                            override['region'] = spreadsheet_to_console_area.regions[-1]
                            bpy.ops.screen.space_type_set_or_cycle(
                                override, 'INVOKE_DEFAULT', space_type='CONSOLE'
                            )
                            space = properties_area.spaces.active
                            space.context = 'RENDER'
                            bpy.ops.workspace.reorder_to_front({'workspace': available_workspaces['POV-Ed']})
                        except AttributeError:
                            # In case necessary area types lack in existing blend files
                            pass

        if 'POV-Mo'not in available_workspaces:
            try:
                if all(tab not in available_workspaces for tab in ['Rendering', 'POV-Mo']):
                    bpy.ops.workspace.append_activate(
                        idname='Rendering',
                        filepath=os.path.join(bpy.utils.user_resource('CONFIG'), 'startup.blend')
                    )
            except BaseException as e:
                print(e.__doc__)
                print('An exception occurred: {}'.format(e))
                try:
                    # Last resort: try to import from the blender templates
                    for p in Path(next(bpy.utils.app_template_paths())).rglob("startup.blend"):
                        bpy.ops.workspace.append_activate(
                            idname=self.targetWorkspace,
                            filepath=str(p))
                except BaseException as e:
                    print(e.__doc__)
                    print('An exception occurred: {}'.format(e))
                    # Giving up
                    print(
                        "\nFactory 'Rendering' workspace needed for POV GUI centric"
                        "\nworkspace to activate when POV is set as default renderer"
                    )
            finally:
                # Create Moray like workspace (GUI oriented editing)
                if 'POV-Mo' not in available_workspaces and 'Rendering' in available_workspaces:
                    wsp1 = available_workspaces.get('Rendering')
                    context = bpy.context
                    if context.scene.render.engine == 'POVRAY_RENDER' and wsp1 is not None:
                        bpy.ops.workspace.duplicate({'workspace': wsp1})
                        available_workspaces['Rendering.001'].name = 'POV-Mo'
                        # Already done it would seem, but explicitly make this workspace the active one
                        context.window.workspace = available_workspaces['POV-Mo']
                        pov_screen = available_workspaces['POV-Mo'].screens[0]
                        pov_workspace = pov_screen.areas
                        pov_window = context.window
                        # override = bpy.context.copy()  # crashes
                        override = {}
                        properties_area = pov_workspace[0]
                        image_editor_to_view3d_area = pov_workspace[2]

                        try:
                            image_editor_to_view3d_area.ui_type = 'VIEW_3D'
                            override['window'] = pov_window
                            override['screen'] = bpy.context.screen
                            override['area'] = image_editor_to_view3d_area
                            override['region'] = image_editor_to_view3d_area.regions[-1]
                            bpy.ops.screen.space_type_set_or_cycle(
                                override, 'INVOKE_DEFAULT', space_type='VIEW_3D'
                            )
                            space = image_editor_to_view3d_area.spaces.active  # Uncomment For non quad view
                            space.region_3d.view_perspective = 'CAMERA'  # Uncomment For non quad view
                            space.show_region_toolbar = True
                            # bpy.ops.view3d.camera_to_view(override)  # Uncomment For non quad view ?
                            for num, reg in enumerate(image_editor_to_view3d_area.regions):
                                if reg.type != 'view3d':
                                    override['region'] = image_editor_to_view3d_area.regions[num]
                            bpy.ops.screen.region_quadview(override)  # Comment out for non quad
                            propspace = properties_area.spaces.active
                            propspace.context = 'MATERIAL'
                            bpy.ops.workspace.reorder_to_front({'workspace': available_workspaces['POV-Mo']})
                        except (AttributeError, TypeError):
                            # In case necessary types lack in existing blend files
                            pass
                        # available_workspaces.update()

    # -----------------------------------UTF-8---------------------------------- #
    # Check and fix all strings in current .blend file to be valid UTF-8 Unicode
    # sometimes needed for old, 2.4x / 2.6x area files
    try:
        bpy.ops.wm.blend_strings_utf8_validate()
    except BaseException as e:
        print(e.__doc__)
        print('An exception occurred: {}'.format(e))
        pass


def check_material(mat):
    """Allow use of material properties buttons rather than nodes."""
    if mat is not None:
        if mat.use_nodes:
            return not mat.node_tree
        return True
    return False


def simple_material(mat):
    """Test if a material is nodeless."""
    return (mat is not None) and (not mat.use_nodes)


def pov_context_texblock(context):
    """Recreate texture context type as deprecated in blender 2.8."""
    idblock = context.brush
    if idblock and context.scene.texture_context == 'OTHER':
        return idblock

    # idblock = bpy.context.active_object.active_material
    idblock = context.view_layer.objects.active.active_material
    if idblock and context.scene.texture_context == 'MATERIAL':
        return idblock

    idblock = context.scene.world
    if idblock and context.scene.texture_context == 'WORLD':
        return idblock

    idblock = context.light
    if idblock and context.scene.texture_context == 'LIGHT':
        return idblock

    if context.particle_system and context.scene.texture_context == 'PARTICLES':
        idblock = context.particle_system.settings
        return idblock

    idblock = context.line_style
    if idblock and context.scene.texture_context == 'LINESTYLE':
        return idblock


# class TextureTypePanel(TextureButtonsPanel):

# @classmethod
# def poll(cls, context):
# tex = context.texture
# engine = context.scene.render.engine
# return tex and ((tex.type == cls.tex_type and not tex.use_nodes) and (engine in cls.COMPAT_ENGINES))


def register():
    update_files.register()
    render_gui.register()
    scenography_gui.register()
    object_gui.register()
    shading_gui.register()
    texturing_gui.register()
    shading_nodes.register()
    scripting_gui.register()

    if pov_centric_moray_like_workspace not in bpy.app.handlers.load_post:
        bpy.app.handlers.load_post.append(pov_centric_moray_like_workspace)


def unregister():
    if pov_centric_moray_like_workspace in bpy.app.handlers.load_post:
        bpy.app.handlers.load_post.remove(pov_centric_moray_like_workspace)

    scripting_gui.unregister()
    shading_nodes.unregister()
    texturing_gui.unregister()
    shading_gui.unregister()
    object_gui.unregister()
    scenography_gui.unregister()
    render_gui.unregister()
    update_files.unregister()