# SPDX-License-Identifier: GPL-2.0-or-later

import bpy, mathutils
from . import util

bl_info = {
    'name': 'Curve Remove Doubles',
    'author': 'Michael Soluyanov',
    'version': (1, 1),
    'blender': (2, 80, 0),
    'location': 'View3D > Context menu (W/RMB) > Remove Doubles',
    'description': 'Adds command "Remove Doubles" for curves',
    'category': 'Add Curve'
}

def main(context, distance = 0.01):

    selected_Curves = util.GetSelectedCurves()
    if bpy.ops.object.mode_set.poll():
        bpy.ops.object.mode_set(mode='EDIT')

    for curve in selected_Curves:
        bezier_dellist = []
        dellist = []

        for spline in curve.data.splines:
            if spline.type == 'BEZIER':
                if len(spline.bezier_points) > 1:
                    for i in range(0, len(spline.bezier_points)):

                        if i == 0:
                            ii = len(spline.bezier_points) - 1
                        else:
                            ii = i - 1

                        dot = spline.bezier_points[i];
                        dot1 = spline.bezier_points[ii];

                        while dot1 in bezier_dellist and i != ii:
                            ii -= 1
                            if ii < 0:
                                ii = len(spline.bezier_points)-1
                            dot1 = spline.bezier_points[ii]

                        if dot.select_control_point and dot1.select_control_point and (i!=0 or spline.use_cyclic_u):

                            if (dot.co-dot1.co).length < distance:
                                # remove points and recreate hangles
                                dot1.handle_right_type = "FREE"
                                dot1.handle_right = dot.handle_right
                                dot1.co = (dot.co + dot1.co) / 2
                                bezier_dellist.append(dot)

                            else:
                                # Handles that are on main point position converts to vector,
                                # if next handle are also vector
                                if dot.handle_left_type == 'VECTOR' and (dot1.handle_right - dot1.co).length < distance:
                                    dot1.handle_right_type = "VECTOR"
                                if dot1.handle_right_type == 'VECTOR' and (dot.handle_left - dot.co).length < distance:
                                    dot.handle_left_type = "VECTOR"
            else:
                if len(spline.points) > 1:
                    for i in range(0, len(spline.points)):

                        if i == 0:
                            ii = len(spline.points) - 1
                        else:
                            ii = i - 1

                        dot = spline.points[i];
                        dot1 = spline.points[ii];

                        while dot1 in dellist and i != ii:
                            ii -= 1
                            if ii < 0:
                                ii = len(spline.points)-1
                            dot1 = spline.points[ii]

                        if dot.select and dot1.select and (i!=0 or spline.use_cyclic_u):

                            if (dot.co-dot1.co).length < distance:
                                dot1.co = (dot.co + dot1.co) / 2
                                dellist.append(dot)

    bpy.ops.curve.select_all(action = 'DESELECT')

    for dot in bezier_dellist:
        dot.select_control_point = True

    for dot in dellist:
        dot.select = True

    bezier_count = len(bezier_dellist)
    count = len(dellist)

    bpy.ops.curve.delete(type = 'VERT')

    bpy.ops.curve.select_all(action = 'DESELECT')

    return bezier_count + count



class CurveRemvDbs(bpy.types.Operator):
    """Merge consecutive points that are near to each other"""
    bl_idname = 'curvetools.remove_doubles'
    bl_label = 'Remove Doubles'
    bl_options = {'REGISTER', 'UNDO'}

    distance: bpy.props.FloatProperty(name = 'Distance', default = 0.01)

    @classmethod
    def poll(cls, context):
        return util.Selected1OrMoreCurves()

    def execute(self, context):
        removed=main(context, self.distance)
        self.report({'INFO'}, "Removed %d bezier points" % removed)
        return {'FINISHED'}



def menu_func(self, context):
    self.layout.operator(CurveRemvDbs.bl_idname, text='Remove Doubles')

def register():
    bpy.utils.register_class(CurveRemvDbs)
    bpy.types.VIEW3D_MT_edit_curve_context_menu.append(menu_func)

def unregister():
    bpy.utils.unregister_class(CurveRemvDbs)
    bpy.types.VIEW3D_MT_edit_curve_context_menu.remove(menu_func)

if __name__ == "__main__":
    register()

operators = [CurveRemvDbs]