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#
#  This program 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 2
#  of the License, or (at your option) any later version.
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#  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.
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#  along with this program; if not, write to the Free Software Foundation,
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'''Based on viewport_timeline_scrub standalone addon - Samuel Bernou'''

from .prefs import get_addon_prefs

import numpy as np
from time import time
import bpy
import gpu
import bgl
import blf
from gpu_extras.batch import batch_for_shader

from bpy.props import (BoolProperty,
                       StringProperty,
                       IntProperty,
                       FloatVectorProperty,
                       IntProperty,
                       PointerProperty,
                       EnumProperty)


def nearest(array, value):
    '''
    Get a numpy array and a target value
    Return closest val found in array to passed value
    '''
    idx = (np.abs(array - value)).argmin()
    return array[idx]


def draw_callback_px(self, context):
    '''Draw callback use by modal to draw in viewport'''
    if context.area != self.current_area:
        return

    # text
    font_id = 0

    shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')  # initiate shader
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glLineWidth(1)

    # Draw HUD
    if self.use_hud_time_line:
        shader.bind()
        shader.uniform_float("color", self.color_timeline)
        self.batch_timeline.draw(shader)

    # Display keyframes
    if self.use_hud_keyframes:
        if self.keyframe_aspect == 'LINE':
            bgl.glLineWidth(3)
            shader.bind()
            shader.uniform_float("color", self.color_timeline)
            self.batch_keyframes.draw(shader)
        else:
            bgl.glLineWidth(1)
            shader.bind()
            shader.uniform_float("color", self.color_timeline)
            self.batch_keyframes.draw(shader)

    # Show current frame line
    bgl.glLineWidth(1)
    if self.use_hud_playhead:
        playhead = [(self.cursor_x, self.my + self.playhead_size/2),
                    (self.cursor_x, self.my - self.playhead_size/2)]
        batch = batch_for_shader(shader, 'LINES', {"pos": playhead})
        shader.bind()
        shader.uniform_float("color", self.color_playhead)
        batch.draw(shader)

    # restore opengl defaults
    bgl.glDisable(bgl.GL_BLEND)

    # Display current frame text
    blf.color(font_id, *self.color_text)
    if self.use_hud_frame_current:
        blf.position(font_id, self.mouse[0]+10, self.mouse[1]+10, 0)
        blf.size(font_id, 30, self.dpi)
        blf.draw(font_id, f'{self.new_frame:.0f}')

    # Display frame offset text
    if self.use_hud_frame_offset:
        blf.position(font_id, self.mouse[0]+10,
                     self.mouse[1]+(40*self.ui_scale), 0)
        blf.size(font_id, 16, self.dpi)
        sign = '+' if self.offset > 0 else ''
        blf.draw(font_id, f'{sign}{self.offset:.0f}')


class GPTS_OT_time_scrub(bpy.types.Operator):
    bl_idname = "animation.time_scrub"
    bl_label = "Time scrub"
    bl_description = "Quick time scrubbing with a shortcut"
    bl_options = {"REGISTER", "INTERNAL", "UNDO"}

    @classmethod
    def poll(cls, context):
        return context.space_data.type in ('VIEW_3D', 'SEQUENCE_EDITOR', 'CLIP_EDITOR')

    def invoke(self, context, event):
        prefs = get_addon_prefs().ts

        self.current_area = context.area
        self.key = prefs.keycode
        self.evaluate_gp_obj_key = prefs.evaluate_gp_obj_key
        self.always_snap = prefs.always_snap
        self.rolling_mode = prefs.rolling_mode

        self.dpi = context.preferences.system.dpi
        self.ui_scale = context.preferences.system.ui_scale
        # hud prefs
        self.color_timeline = prefs.color_timeline
        self.color_playhead = prefs.color_playhead
        self.color_text = prefs.color_playhead
        self.use_hud_time_line = prefs.use_hud_time_line
        self.use_hud_keyframes = prefs.use_hud_keyframes
        self.keyframe_aspect = prefs.keyframe_aspect
        self.use_hud_playhead = prefs.use_hud_playhead
        self.use_hud_frame_current = prefs.use_hud_frame_current
        self.use_hud_frame_offset = prefs.use_hud_frame_offset

        self.playhead_size = prefs.playhead_size
        self.lines_size = prefs.lines_size

        self.px_step = prefs.pixel_step
        self.snap_on = False
        self.mouse = (event.mouse_region_x, event.mouse_region_y)
        self.init_mouse_x = self.cursor_x = event.mouse_region_x

        # self.init_mouse_y = event.mouse_region_y # only to display init frame text
        self.cancel_frame = self.init_frame = self.new_frame = context.scene.frame_current
        self.lock_range = context.scene.lock_frame_selection_to_range
        if context.scene.use_preview_range:
            self.f_start = context.scene.frame_preview_start
            self.f_end = context.scene.frame_preview_end
        else:
            self.f_start = context.scene.frame_start
            self.f_end = context.scene.frame_end

        self.offset = 0
        self.pos = []

        # Snap control
        self.snap_ctrl = not prefs.use_ctrl
        self.snap_shift = not prefs.use_shift
        self.snap_alt = not prefs.use_alt
        self.snap_mouse_key = 'LEFTMOUSE' if self.key == 'RIGHTMOUSE' else 'RIGHTMOUSE'

        ob = context.object

        if context.space_data.type != 'VIEW_3D':
            ob = None  # do not consider any key

        if ob:  # condition to allow empty scrubing
            if ob.type != 'GPENCIL' or self.evaluate_gp_obj_key:
                # Get objet keyframe position
                anim_data = ob.animation_data
                action = None

                if anim_data:
                    action = anim_data.action
                if action:
                    for fcu in action.fcurves:
                        for kf in fcu.keyframe_points:
                            if kf.co.x not in self.pos:
                                self.pos.append(kf.co.x)

            if ob.type == 'GPENCIL':
                # Get GP frame position
                gpl = ob.data.layers
                layer = gpl.active
                if layer:
                    for frame in layer.frames:
                        if frame.frame_number not in self.pos:
                            self.pos.append(frame.frame_number)

        if not ob or not self.pos:
            # Disable inverted behavior if no frame to snap
            self.always_snap = False
            if self.rolling_mode:
                self.report({'WARNING'}, 'No Keys to flip on')
                return {'CANCELLED'}

        if self.rolling_mode:
            # sorted and casted to int list since it's going to work with indexes
            self.pos = sorted([int(f) for f in self.pos])
            # find and make current frame the "starting" frame (force snap)
            active_pos = [i for i, num in enumerate(self.pos) if num <= self.init_frame]
            if active_pos:
                self.init_index = active_pos[-1]
                self.init_frame = self.new_frame = self.pos[self.init_index]
            else:
                self.init_index = 0
                self.init_frame = self.new_frame = self.pos[0]
                
            # del active_pos
            self.index_limit = len(self.pos) - 1

        # Also snap on play bounds (sliced off for keyframe display)
        self.pos += [self.f_start, self.f_end]

        # Disable Onion skin
        self.active_space_data = context.space_data
        self.onion_skin = None
        self.multi_frame = None
        if context.space_data.type == 'VIEW_3D':  # and 'GPENCIL' in context.mode
            self.onion_skin = self.active_space_data.overlay.use_gpencil_onion_skin
            self.active_space_data.overlay.use_gpencil_onion_skin = False

        if ob and ob.type == 'GPENCIL':
            if ob.data.use_multiedit:
                self.multi_frame = ob.data.use_multiedit
                ob.data.use_multiedit = False

        self.hud = prefs.use_hud
        if not self.hud:
            ## Same as end settings when HUD is On
            if self.lock_range:
                self.pos = [i for i in self.pos if self.f_start <= i <= self.f_end]
            self.pos = np.asarray(self.pos)
            if self.rolling_mode:
                context.scene.frame_current = self.new_frame
            context.window_manager.modal_handler_add(self)
            return {'RUNNING_MODAL'}

        # - HUD params
        width = context.area.width
        right = int((width - self.init_mouse_x) / self.px_step)
        left = int(self.init_mouse_x / self.px_step)

        hud_pos_x = []
        for i in range(1, left):
            hud_pos_x.append(self.init_mouse_x - i*self.px_step)
        for i in range(1, right):
            hud_pos_x.append(self.init_mouse_x + i*self.px_step)

        # - list of double coords

        init_height = 60
        frame_height = self.lines_size
        key_height = 14
        bound_h = key_height + 19
        bound_bracket_l = self.px_step/2

        self.my = my = event.mouse_region_y

        self.hud_lines = []

        if not self.rolling_mode:
            # frame marks
            for x in hud_pos_x:
                self.hud_lines.append((x, my - (frame_height/2)))
                self.hud_lines.append((x, my + (frame_height/2)))

        # init frame mark
        self.hud_lines += [(self.init_mouse_x, my - (init_height/2)),
                           (self.init_mouse_x, my + (init_height/2))]

        if not self.rolling_mode:
            # Add start/end boundary bracket to HUD
            start_x = self.init_mouse_x + \
                (self.f_start - self.init_frame) * self.px_step
            end_x = self.init_mouse_x + \
                (self.f_end - self.init_frame) * self.px_step

            # start
            up = (start_x, my - (bound_h/2))
            dn = (start_x, my + (bound_h/2))
            self.hud_lines.append(up)
            self.hud_lines.append(dn)

            self.hud_lines.append(up)
            self.hud_lines.append((up[0] + bound_bracket_l, up[1]))
            self.hud_lines.append(dn)
            self.hud_lines.append((dn[0] + bound_bracket_l, dn[1]))

            # end
            up = (end_x, my - (bound_h/2))
            dn = (end_x, my + (bound_h/2))
            self.hud_lines.append(up)
            self.hud_lines.append(dn)

            self.hud_lines.append(up)
            self.hud_lines.append((up[0] - bound_bracket_l, up[1]))
            self.hud_lines.append(dn)
            self.hud_lines.append((dn[0] - bound_bracket_l, dn[1]))

        # Horizontal line
        self.hud_lines += [(0, my), (width, my)]

        # Prepare batchs to draw static parts
        shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')  # initiate shader
        self.batch_timeline = batch_for_shader(
            shader, 'LINES', {"pos": self.hud_lines})
        
        if self.rolling_mode:
            current_id = self.pos.index(self.new_frame)
            # Add init_frame to "cancel" it in later UI code
            ui_key_pos = [i - current_id + self.init_frame for i, _f in enumerate(self.pos[:-2])]
        else:
            ui_key_pos = self.pos[:-2]
        

        # keyframe display
        if self.keyframe_aspect == 'LINE':
            key_lines = []
            # Slice off position of start/end frame added last (in list for snapping)
            for i in ui_key_pos:
                key_lines.append(
                    (self.init_mouse_x + ((i-self.init_frame) * self.px_step), my - (key_height/2)))
                key_lines.append(
                    (self.init_mouse_x + ((i-self.init_frame) * self.px_step), my + (key_height/2)))

            self.batch_keyframes = batch_for_shader(
                shader, 'LINES', {"pos": key_lines})

        else:
            # diamond and square
            # keysize5 for square, 4 or 6 for diamond
            keysize = 6 if self.keyframe_aspect == 'DIAMOND' else 5
            upper = 0

            shaped_key = []
            indices = []
            idx_offset = 0
            for i in ui_key_pos:
                center = self.init_mouse_x + ((i-self.init_frame)*self.px_step)
                if self.keyframe_aspect == 'DIAMOND':
                    # +1 on x is to correct pixel alignement
                    shaped_key += [(center-keysize, my+upper),
                                   (center+1, my+keysize+upper),
                                   (center+keysize, my+upper),
                                   (center+1, my-keysize+upper)]

                elif self.keyframe_aspect == 'SQUARE':
                    shaped_key += [(center-keysize+1, my-keysize+upper),
                                   (center-keysize+1, my+keysize+upper),
                                   (center+keysize, my+keysize+upper),
                                   (center+keysize, my-keysize+upper)]

                indices += [(0+idx_offset, 1+idx_offset, 2+idx_offset),
                            (0+idx_offset, 2+idx_offset, 3+idx_offset)]
                idx_offset += 4

            self.batch_keyframes = batch_for_shader(
                shader, 'TRIS', {"pos": shaped_key}, indices=indices)

        # Trim snapping list of frame outside of frame range if range lock activated
        # (after drawing batch so those are still showed)
        if self.lock_range:
            self.pos = [i for i in self.pos if self.f_start <= i <= self.f_end]

        # convert frame list to array for numpy snap utility
        self.pos = np.asarray(self.pos)

        if self.rolling_mode:
            context.scene.frame_current = self.new_frame

        args = (self, context)
        self.viewtype = None
        self.spacetype = 'WINDOW'  # is PREVIEW for VSE, needed for handler remove

        if context.space_data.type == 'VIEW_3D':
            self.viewtype = bpy.types.SpaceView3D
            self._handle = bpy.types.SpaceView3D.draw_handler_add(
                draw_callback_px, args, 'WINDOW', 'POST_PIXEL')

        elif context.space_data.type == 'SEQUENCE_EDITOR':
            self.viewtype = bpy.types.SpaceSequenceEditor
            self.spacetype = 'PREVIEW'
            self._handle = bpy.types.SpaceSequenceEditor.draw_handler_add(
                draw_callback_px, args, 'PREVIEW', 'POST_PIXEL')

        elif context.space_data.type == 'CLIP_EDITOR':
            self.viewtype = bpy.types.SpaceClipEditor
            self._handle = bpy.types.SpaceClipEditor.draw_handler_add(
                draw_callback_px, args, 'WINDOW', 'POST_PIXEL')

        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}

    def _exit_modal(self, context):
        if self.onion_skin is not None:
            self.active_space_data.overlay.use_gpencil_onion_skin = self.onion_skin
        if self.multi_frame:
            context.object.data.use_multiedit = self.multi_frame
        if self.hud and self.viewtype:
            self.viewtype.draw_handler_remove(self._handle, self.spacetype)
            context.area.tag_redraw()

    def modal(self, context, event):

        if event.type == 'MOUSEMOVE':
            # - calculate frame offset from pixel offset
            # - get mouse.x and add it to initial frame num
            self.mouse = (event.mouse_region_x, event.mouse_region_y)

            px_offset = (event.mouse_region_x - self.init_mouse_x)
            self.offset = int(px_offset / self.px_step)
            self.new_frame = self.init_frame + self.offset

            if self.rolling_mode:
                # Frame Flipping mode (equidistant scrub snap)
                self.index = self.init_index + self.offset
                # clamp to possible index range
                self.index = min(max(self.index, 0), self.index_limit)
                self.new_frame = self.pos[self.index]
                context.scene.frame_current = self.new_frame
                self.cursor_x = self.init_mouse_x + (self.offset * self.px_step)

            else:
                mod_snap = False
                if self.snap_ctrl and event.ctrl:
                    mod_snap = True
                if self.snap_shift and event.shift:
                    mod_snap = True
                if self.snap_alt and event.alt:
                    mod_snap = True

                ## Snapping
                if self.always_snap:
                    # inverted snapping behavior
                    if not self.snap_on and not mod_snap:
                        self.new_frame = nearest(self.pos, self.new_frame)
                else:
                    if self.snap_on or mod_snap:
                        self.new_frame = nearest(self.pos, self.new_frame)

                # frame range restriction
                if self.lock_range:
                    if self.new_frame < self.f_start:
                        self.new_frame = self.f_start
                    elif self.new_frame > self.f_end:
                        self.new_frame = self.f_end

                # context.scene.frame_set(self.new_frame)
                context.scene.frame_current = self.new_frame

                # - recalculate offset to snap cursor to frame
                self.offset = self.new_frame - self.init_frame

                # - calculate cursor pixel position from frame offset
                self.cursor_x = self.init_mouse_x + (self.offset * self.px_step)

        if event.type == 'ESC':
            # frame_set(self.init_frame) ?
            context.scene.frame_current = self.cancel_frame
            self._exit_modal(context)
            return {'CANCELLED'}

        # Snap if pressing NOT used mouse key (right or mid)
        if event.type == self.snap_mouse_key:
            if event.value == "PRESS":
                self.snap_on = True
            else:
                self.snap_on = False

        if event.type == self.key and event.value == 'RELEASE':
            self._exit_modal(context)
            return {'FINISHED'}

        return {"RUNNING_MODAL"}


# --- addon prefs

def auto_rebind(self, context):
    unregister_keymaps()
    register_keymaps()


class GPTS_OT_set_scrub_keymap(bpy.types.Operator):
    bl_idname = "animation.ts_set_keymap"
    bl_label = "Change keymap"
    bl_description = "Quick time scrubbing with a shortcut"
    bl_options = {"REGISTER", "INTERNAL"}

    def invoke(self, context, event):
        self.prefs = get_addon_prefs().ts
        self.ctrl = False
        self.shift = False
        self.alt = False

        self.init_value = self.prefs.keycode
        self.prefs.keycode = ''
        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}

    def modal(self, context, event):
        exclude_keys = {'MOUSEMOVE', 'INBETWEEN_MOUSEMOVE',
                        'TIMER_REPORT', 'ESC', 'WHEELUPMOUSE', 'WHEELDOWNMOUSE'}
        exclude_in = ('SHIFT', 'CTRL', 'ALT')
        if event.type == 'ESC':
            self.prefs.keycode = self.init_value
            return {'CANCELLED'}

        self.ctrl = event.ctrl
        self.shift = event.shift
        self.alt = event.alt

        if event.type not in exclude_keys and not any(x in event.type for x in exclude_in):
            print('key:', event.type, 'value:', event.value)
            if event.value == 'PRESS':
                self.report({'INFO'}, event.type)
                # set the chosen key
                self.prefs.keycode = event.type
                # Following condition to avoid unnecessary rebind update
                if self.prefs.use_shift != event.shift:
                    self.prefs.use_shift = event.shift

                if self.prefs.use_alt != event.alt:
                    self.prefs.use_alt = event.alt

                # -# Trigger rebind update with last
                self.prefs.use_ctrl = event.ctrl

                return {'FINISHED'}

        return {"RUNNING_MODAL"}


class GPTS_timeline_settings(bpy.types.PropertyGroup):

    keycode: StringProperty(
        name="Shortcut",
        description="Shortcut to trigger the scrub in viewport during press",
        default="MIDDLEMOUSE")

    always_snap: BoolProperty(
        name="Always Snap",
        description="Always snap to keys if any, modifier is used deactivate the snapping\nDisabled if no keyframe found",
        default=False)

    rolling_mode: BoolProperty(
        name="Rolling Mode",
        description="Alternative Gap-less timeline. No time informations to quickly roll/flip over keys\nOverride normal and 'always snap' mode",
        default=False)

    use: BoolProperty(
        name="Enable",
        description="Enable/Disable timeline scrub",
        default=True,
        update=auto_rebind)

    use_in_timeline_editor: BoolProperty(
        name="Shortcut in timeline editors",
        description="Add the same shortcut to scrub in timeline editor windows",
        default=True,
        update=auto_rebind)

    use_shift: BoolProperty(
        name="Combine With Shift",
        description="Add shift",
        default=False,
        update=auto_rebind)

    use_alt: BoolProperty(
        name="Combine With Alt",
        description="Add alt",
        default=True,
        update=auto_rebind)

    use_ctrl: BoolProperty(
        name="Combine With Ctrl",
        description="Add ctrl",
        default=False,
        update=auto_rebind)

    evaluate_gp_obj_key: BoolProperty(
        name='Use Gpencil Object Keyframes',
        description="Also snap on greasepencil object keyframe (else only active layer frames)",
        default=True)

    pixel_step: IntProperty(
        name="Frame Interval On Screen",
        description="Pixel steps on screen that represent a frame intervals",
        default=10,
        min=1,
        max=500,
        soft_min=2,
        soft_max=100,
        step=1,
        subtype='PIXEL')

    use_hud: BoolProperty(
        name='Display Timeline Overlay',
        description="Display overlays with timeline information when scrubbing time in viewport",
        default=True)

    use_hud_time_line: BoolProperty(
        name='Timeline',
        description="Display a static marks overlay to represent timeline when scrubbing",
        default=True)

    use_hud_keyframes: BoolProperty(
        name='Keyframes',
        description="Display shapes overlay to show keyframe position when scrubbing",
        default=True)

    use_hud_playhead: BoolProperty(
        name='Playhead',
        description="Display the playhead as a vertical line to show position in time",
        default=True)

    use_hud_frame_current: BoolProperty(
        name='Text Frame Current',
        description="Display the current frame as text above mouse cursor",
        default=True)

    use_hud_frame_offset: BoolProperty(
        name='Text Frame Offset',
        description="Display frame offset from initial position as text above mouse cursor",
        default=True)

    color_timeline: FloatVectorProperty(
        name="Timeline Color",
        subtype='COLOR_GAMMA',
        size=4,
        default=(0.5, 0.5, 0.5, 0.6),
        min=0.0, max=1.0,
        description="Color of the temporary timeline")

    color_playhead: FloatVectorProperty(
        name="Cusor Color",
        subtype='COLOR_GAMMA',
        size=4,
        default=(0.01, 0.64, 1.0, 0.8),
        min=0.0, max=1.0,
        description="Color of the temporary line cursor and text")

    # sizes
    playhead_size: IntProperty(
        name="Playhead Size",
        description="Playhead height in pixels",
        default=100,
        min=2,
        max=10000,
        soft_min=10,
        soft_max=5000,
        step=1,
        subtype='PIXEL')

    lines_size: IntProperty(
        name="Frame Lines Size",
        description="Frame lines height in pixels",
        default=10,
        min=1,
        max=10000,
        soft_min=5,
        soft_max=40,
        step=1,
        subtype='PIXEL')

    keyframe_aspect: EnumProperty(
        name="Keyframe Display",
        description="Customize aspect of the keyframes",
        default='LINE',
        items=(
            ('LINE', 'Line',
             'Keyframe displayed as thick lines', 'SNAP_INCREMENT', 0),
            ('SQUARE', 'Square',
             'Keyframe displayed as squares', 'HANDLETYPE_VECTOR_VEC', 1),
            ('DIAMOND', 'Diamond',
             'Keyframe displayed as diamonds', 'HANDLETYPE_FREE_VEC', 2),
        ))


def draw_ts_pref(prefs, layout):
    # - General settings
    layout.label(text='Timeline Scrub:')
    layout.prop(prefs, 'use')
    if not prefs.use:
        return
    layout.prop(prefs, 'evaluate_gp_obj_key')
    layout.prop(prefs, 'pixel_step')

    # -/ Keymap -
    box = layout.box()
    box.label(text='Keymap:')
    box.operator('animation.ts_set_keymap',
                 text='Click here to change shortcut')

    if prefs.keycode:
        row = box.row(align=True)
        row.prop(prefs, 'use_ctrl', text='Ctrl')
        row.prop(prefs, 'use_alt', text='Alt')
        row.prop(prefs, 'use_shift', text='Shift')
        # -/Cosmetic-
        icon = None
        if prefs.keycode == 'LEFTMOUSE':
            icon = 'MOUSE_LMB'
        elif prefs.keycode == 'MIDDLEMOUSE':
            icon = 'MOUSE_MMB'
        elif prefs.keycode == 'RIGHTMOUSE':
            icon = 'MOUSE_RMB'
        if icon:
            row.label(text=f'{prefs.keycode}', icon=icon)
        # -Cosmetic-/
        else:
            row.label(text=f'Key: {prefs.keycode}')

    else:
        box.label(text='[ NOW TYPE KEY OR CLICK TO USE, WITH MODIFIER ]')

    if prefs.always_snap:
        snap_text = 'Disable keyframes snap: '
    else:
        snap_text = 'Keyframes snap: '
    
    snap_text += 'Left Mouse' if prefs.keycode == 'RIGHTMOUSE' else 'Right Mouse'
    if not prefs.use_ctrl:
        snap_text += ' or Ctrl'
    if not prefs.use_shift:
        snap_text += ' or Shift'
    if not prefs.use_alt:
        snap_text += ' or Alt'
    
    if prefs.rolling_mode:
        snap_text = 'Gap-less mode (always snap)'

    box.label(text=snap_text, icon='SNAP_ON')
    if prefs.keycode in ('LEFTMOUSE', 'RIGHTMOUSE', 'MIDDLEMOUSE') and not prefs.use_ctrl and not prefs.use_alt and not prefs.use_shift:
        box.label(
            text="Recommended to choose at least one modifier to combine with clicks (default: Ctrl+Alt)", icon="ERROR")

    row = box.row()
    row.prop(prefs, 'always_snap')
    row.prop(prefs, 'rolling_mode')
    box.prop(prefs, 'use_in_timeline_editor',
             text='Add same shortcut to scrub within timeline editors')

    # - HUD/OSD
    box = layout.box()
    box.prop(prefs, 'use_hud')

    col = box.column()
    row = col.row()
    row.prop(prefs, 'color_timeline')
    row.prop(prefs, 'color_playhead', text='Cursor And Text Color')
    col.label(text='Show:')
    row = col.row()
    row.prop(prefs, 'use_hud_time_line')
    row.prop(prefs, 'lines_size')
    row = col.row()
    row.prop(prefs, 'use_hud_playhead')
    row.prop(prefs, 'playhead_size')
    row = col.row()
    row.prop(prefs, 'use_hud_keyframes')
    row.prop(prefs, 'keyframe_aspect', text='')
    row = col.row()
    row.prop(prefs, 'use_hud_frame_current')
    row.prop(prefs, 'use_hud_frame_offset')
    col.enabled = prefs.use_hud


# --- Keymap

addon_keymaps = []

def register_keymaps():
    prefs = get_addon_prefs().ts
    if not prefs.use:
        return

    addon = bpy.context.window_manager.keyconfigs.addon
    km = addon.keymaps.new(name="Grease Pencil",
                           space_type="EMPTY", region_type='WINDOW')

    if not prefs.keycode:
        print(r'/!\ Timeline scrub: no keycode entered for keymap')
        return
    kmi = km.keymap_items.new(
        'animation.time_scrub',
        type=prefs.keycode, value='PRESS',
        alt=prefs.use_alt, ctrl=prefs.use_ctrl, shift=prefs.use_shift, any=False)
    kmi.repeat = False
    addon_keymaps.append((km, kmi))

    # - Add keymap in timeline editors
    if prefs.use_in_timeline_editor:

        editor_l = [
            ('Dopesheet', 'DOPESHEET_EDITOR', 'anim.change_frame'),
            ('Graph Editor', 'GRAPH_EDITOR', 'graph.cursor_set'),
            ("NLA Editor", "NLA_EDITOR", 'anim.change_frame'),
            ("Sequencer", "SEQUENCE_EDITOR", 'anim.change_frame')
            # ("Clip Graph Editor", "CLIP_EDITOR", 'clip.change_frame'),
        ]

        for editor, space, operator in editor_l:
            km = addon.keymaps.new(name=editor, space_type=space)
            kmi = km.keymap_items.new(
                operator, type=prefs.keycode, value='PRESS',
                alt=prefs.use_alt, ctrl=prefs.use_ctrl, shift=prefs.use_shift)
            addon_keymaps.append((km, kmi))


def unregister_keymaps():
    for km, kmi in addon_keymaps:
        km.keymap_items.remove(kmi)
    addon_keymaps.clear()

# --- REGISTER ---

classes = (
    GPTS_OT_time_scrub,
    GPTS_OT_set_scrub_keymap,
)

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

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