# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (C) 2016-2020 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors
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"}