#
# 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/>.
#
from operator import attrgetter

import bpy

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


class POWER_SEQUENCER_OT_trim_left_or_right_handles(bpy.types.Operator):
    """
    Trims or extends the handle closest to the time cursor for all selected strips.

    If you keep the Shift key down, the edit will ripple through the timeline.
    Auto selects sequences under the time cursor when you don't have a selection
    """

    doc = {
        "name": doc_name(__qualname__),
        "demo": "",
        "description": doc_description(__doc__),
        "shortcuts": [
            (
                {"type": "K", "value": "PRESS", "alt": True},
                {"side": "RIGHT", "ripple": False},
                "Smart Snap Right",
            ),
            (
                {"type": "K", "value": "PRESS", "alt": True, "shift": True},
                {"side": "RIGHT", "ripple": True},
                "Smart Snap Right With Ripple",
            ),
            (
                {"type": "K", "value": "PRESS", "ctrl": True},
                {"side": "LEFT", "ripple": False},
                "Smart Snap Left",
            ),
            (
                {"type": "K", "value": "PRESS", "ctrl": True, "shift": True},
                {"side": "LEFT", "ripple": True},
                "Smart Snap Left With Ripple",
            ),
        ],
        "keymap": "Sequencer",
    }
    bl_idname = doc_idname(__qualname__)
    bl_label = doc["name"]
    bl_description = doc_brief(doc["description"])
    bl_options = {"REGISTER", "UNDO"}

    side: bpy.props.EnumProperty(
        items=[("LEFT", "Left", "Left side"), ("RIGHT", "Right", "Right side")],
        name="Snap side",
        description="Handle side to use for the snap",
        default="LEFT",
    )
    ripple: bpy.props.BoolProperty(name="Ripple", default=False)

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

    def execute(self, context):
        frame_current = context.scene.frame_current

        # Only select sequences under the time cursor
        sequences = (
            context.selected_sequences
            if context.selected_sequences
            else context.sequences
        )
        for s in sequences:
            s.select = (
                s.frame_final_start <= frame_current
                and s.frame_final_end >= frame_current
            )
        sequences = [s for s in sequences if s.select]
        if not sequences:
            return {"FINISHED"}

        for s in sequences:
            if self.side == "LEFT":
                s.select_left_handle = True
            if self.side == "RIGHT":
                s.select_right_handle = True

        # If trimming from the left, we need to save the start frame before trimming
        ripple_start_frame = 0
        if self.ripple and self.side == "LEFT":
            ripple_start_frame = min(
                sequences, key=attrgetter("frame_final_start")
            ).frame_final_start

        bpy.ops.sequencer.snap(frame=frame_current)
        for s in sequences:
            s.select_right_handle = False
            s.select_left_handle = False

        if self.ripple and sequences:
            if self.side == "RIGHT":
                ripple_start_frame = max(
                    sequences, key=attrgetter("frame_final_end")
                ).frame_final_end
                bpy.ops.power_sequencer.gap_remove(frame=ripple_start_frame)
            else:
                bpy.ops.power_sequencer.gap_remove(frame=ripple_start_frame)

        return {"FINISHED"}
