#
# Copyright (C) 2016-2020 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/>.
#
"""
Find the two closest cuts, trims and deletes all strips above in the range but leaves some
margin. Removes the newly formed gap.
"""
import bpy

from .utils.functions import convert_duration_to_frames, trim_strips
from .utils.doc import doc_name, doc_idname, doc_brief, doc_description
from .utils.functions import find_closest_surrounding_cuts_frames, find_strips_in_range


class POWER_SEQUENCER_OT_trim_to_surrounding_cuts(bpy.types.Operator):
    """*Brief* Automatically trim to surrounding cuts with some time offset

    Finds the two cuts closest to the mouse cursor and trims the footage in between, leaving a
    little time offset. It's useful after you removed some bad audio but you need to keep some
    video around for a transition.

    By default, the tool leaves a 0.2 seconds margin on either side of the trim.
    """

    doc = {
        "name": doc_name(__qualname__),
        "demo": "",
        "description": doc_description(__doc__),
        "shortcuts": [
            (
                {"type": "LEFTMOUSE", "value": "PRESS", "shift": True, "alt": True},
                {},
                "Trim to Surrounding Cuts",
            )
        ],
        "keymap": "Sequencer",
    }
    bl_idname = doc_idname(__qualname__)
    bl_label = doc["name"]
    bl_description = doc_brief(doc["description"])
    bl_options = {"REGISTER", "UNDO"}

    margin: bpy.props.FloatProperty(
        name="Trim margin",
        description="Margin to leave on either sides of the trim in seconds",
        default=0.2,
        min=0,
    )
    gap_remove: bpy.props.BoolProperty(
        name="Remove gaps",
        description="When trimming the sequences, remove gaps automatically",
        default=True,
    )

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

    def invoke(self, context, event):
        if not context.sequences:
            return {"CANCELLED"}

        frame = context.region.view2d.region_to_view(
            x=event.mouse_region_x, y=event.mouse_region_y
        )[0]
        frame = round(frame)

        margin_frame = convert_duration_to_frames(context, self.margin)
        left_cut_frame, right_cut_frame = find_closest_surrounding_cuts_frames(context, frame)
        if abs(left_cut_frame - right_cut_frame) <= margin_frame * 2:
            self.report(
                {"WARNING"},
                ("The trim margin is larger than the gap\n" "Use snap trim or reduce the margin"),
            )
            return {"CANCELLED"}

        to_delete, to_trim = find_strips_in_range(
            left_cut_frame, right_cut_frame, context.sequences
        )
        trim_start, trim_end = (left_cut_frame + margin_frame, right_cut_frame - margin_frame)

        trim_strips(context, trim_start, trim_end, to_trim, to_delete)

        if self.gap_remove:
            frame_to_remove_gap = right_cut_frame - 1 if frame == right_cut_frame else frame
            # bpy.ops.anim.change_frame(frame_to_remove_gap)
            context.scene.frame_current = frame_to_remove_gap
            bpy.ops.power_sequencer.gap_remove()
            context.scene.frame_current = trim_start

        return {"FINISHED"}
