#
# Copyright (C) 2016-2019 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors
#
# This file is part of Power Sequencer.
#
# Power Sequencer 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.
#
# Power Sequencer 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 Power Sequencer. If
# not, see <https://www.gnu.org/licenses/>.
#
import bpy
from operator import attrgetter

from .utils.doc import doc_name, doc_idname, doc_brief, doc_description


class POWER_SEQUENCER_OT_scene_create_from_selection(bpy.types.Operator):
    """
    *brief* Convert selected strips into a scene strip


    Create a scene from the selected sequences, copying the current scene's settings, and
    replace the selection with the newly created scene as a strip
    """

    doc = {
        "name": doc_name(__qualname__),
        "demo": "",
        "description": doc_description(__doc__),
        "shortcuts": [],
        "keymap": "Sequencer",
    }
    bl_idname = doc_idname(__qualname__)
    bl_label = doc["name"]
    bl_description = doc_brief(doc["description"])
    bl_options = {"REGISTER", "UNDO"}

    move_to_first_frame: bpy.props.BoolProperty(
        name="Move to First Frame",
        description="The strips will start at frame 1 on the new scene",
        default=True,
    )

    @classmethod
    def poll(cls, context):
        return context.selected_sequences

    def execute(self, context):
        start_scene_name = context.scene.name

        selection = context.selected_sequences
        selection_start_frame = min(
            selection, key=attrgetter("frame_final_start")
        ).frame_final_start
        selection_start_channel = min(selection, key=attrgetter("channel")).channel

        # Create new scene for the scene strip
        bpy.ops.scene.new(type="FULL_COPY")
        new_scene_name = context.scene.name

        bpy.ops.sequencer.select_all(action="INVERT")
        bpy.ops.power_sequencer.delete_direct()
        frame_offset = selection_start_frame - 1
        for s in context.sequences:
            try:
                s.frame_start -= frame_offset
            except Exception:
                continue
        bpy.ops.sequencer.select_all()
        bpy.ops.power_sequencer.preview_to_selection()

        # Back to start scene
        context.screen.scene = bpy.data.scenes[start_scene_name]

        bpy.ops.power_sequencer.delete_direct()
        bpy.ops.sequencer.scene_strip_add(
            frame_start=selection_start_frame, channel=selection_start_channel, scene=new_scene_name
        )
        scene_strip = context.selected_sequences[0]
        scene_strip.use_sequence = True
        return {"FINISHED"}
