# SPDX-License-Identifier: GPL-3.0-or-later

import bpy
import re
# import bpy_extras
# from bpy_extras.io_utils import ImportHelper
from pathlib import Path
from bpy.types import Operator
from .. import core
from .. constants import BGCOL, MODULE_DIR

## Plane conversion between multiple types: GP plane / image plane / empty references

def convert_background_image(ob, target = 'GPENCIL'):
    '''Target in ['GPENCIL', 'EMPTY', 'MESH']'''

    if target == ob.type:
        print('WARNING', f'{ob.name} Already of type {target}')
        return

    scn = bpy.context.scene
    cam = scn.objects.get('bg_cam')
    if not cam:
        cam = ob.parent
    if not cam: 
        cam = scn.camera
    if not cam:
        print('No "bg_cam", no parent, source object is not parented !')
        return

    # Get info from Source
    img_infos = core.get_image_infos_from_object(ob)
    if not img_infos:
        print(f'No could not retrieve image source from {ob}')
        return

    image_data, opacity = img_infos


    ### Create new plane type

    ## RENAME to avoid conflict (always keep same name for list scan ?)
    ## rename source temporarily
    ## write type in name ?
    ## name only holder (if there is a holder)

    ob.name = f'{ob.name}_temp'
    
    ## TODO: ensure image filepath is ok ?
    
    suffix = ''
    if target == 'GPENCIL':
        ## Create GP plane from Texture source
        new = core.import_image_as_gp_reference(
        image_data,
        pack_image=False,
        )
        suffix = '_texgp'

    if target == 'MESH':
        ## HARDCODED text blend path:
        # blend = '/s/blender/blender-2.9_scripts/addons/bg_plane_manager/texture_plane.blend'
        blend = str(MODULE_DIR / 'texture_plane.blend')
        node_group = core.link_nodegroup(blend, 'texture_plane', link=False)
        new = core.create_image_plane(image_data, node_group)
        suffix = '_texplane'
    
    if target == 'EMPTY':
        new = core.create_empty_image(image_data)
        suffix = '_texempty'


    # Strip after '.' or get original name ?
    print('source name: ', new.name)
    new.name = core.clean_image_name(image_data.name) + suffix
    print('final name:', new.name)
    new['is_background'] = True

    ## Without holder
    ## Transfer attributes
    # core.create_plane_driver(new, cam)
    # new.parent = cam

    # new['distance'] = ob['distance']
    # new['scale'] = ob['scale']


    # new.lock_location = ob.lock_location # lock only X,Y ?
    # new.hide_select = ob.hide_select
    
    # new.rotation_euler = ob.rotation_euler

    ## With holder
    new.parent = ob.parent


    ## Loc/scale overrided by driver
    # new.location = ob.location
    # new.scale = ob.scale

    ## Transfer current transparency

    # Destination
    core.set_opacity(new, opacity)

    ## Set in collection 
    if not len(ob.users_collection):
        core.set_collection(new, BGCOL)
    else:
        core.set_collection(new, ob.users_collection[0].name)

    ## Remove old object
    bpy.data.objects.remove(ob)

    return new


class BPM_OT_convert_planes(Operator):
    bl_idname = "bpm.convert_planes"
    bl_label = "Convert Planes"
    bl_description = "Convert as plane all images inside a folder"
    bl_options = {"REGISTER"} # , "UNDO"

    target_type : bpy.props.EnumProperty(
        name="Convert To", description="", default='GPENCIL', options={'ANIMATABLE'},
        items=(
            ('GPENCIL', 'Gpencil Object', 'Convert bg planes to gpencil objects', 0),
            ('EMPTY', 'Empty Reference', 'Convert bg planes to empty objects', 1),   
            ('MESH', 'Texture Plane', 'Convert bg planes to mesh objects', 2),   
            ))

    def invoke(self, context, event):
        return context.window_manager.invoke_props_dialog(self, width=250)
        # return self.execute(context)

    def execute(self, context):
        print('BPM_OT_convert_planes')
        holder_list = core.scan_backgrounds(all_bg=True)
        if not holder_list:
            self.report({'ERROR'}, 'No Background found to convert, Structure must have a parent holder')
            return {'CANCELLED'}
        for holder in holder_list:
            if not holder.children:
                print(f'{holder.name} has not child')
                continue
            ob = holder.children[0] # take first child FIXME: what if multiple childrens ?
            new_bg = convert_background_image(ob, target=self.target_type)


        # if isinstance(new_bg, str):
        #     self.report({'ERROR'}, new_bg)
        return {"FINISHED"}

classes=(
BPM_OT_convert_planes,
)

def register():
    for cls in classes:
        bpy.utils.register_class(cls)

def unregister():
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)