import bpy
from bpy.props import (FloatProperty,
                        BoolProperty,
                        EnumProperty,
                        StringProperty,
                        IntProperty)
from . import fn
import math
import re

class GPEXP_OT_layers_state(bpy.types.Operator):
    bl_idname = "gp.layers_state"
    bl_label = "Set Layers State"
    bl_description = "Display state of layer that migh need adjustement"
    bl_options = {"REGISTER"} # , "UNDO"

    # clear_unused_view_layers :BoolProperty(name="Clear unused view layers", 
    #     description="Delete view layer that aren't used in the nodetree anymore",
    #     default=True)

    # TODO : (optional) export layer opacity to json and/or text
    # (that way compo artists can re-affect opacity quickly or at least have a reminder)

    all_objects : BoolProperty(name='On All Object',
        default=True, description='On All object, else use selected objects') # , options={'SKIP_SAVE'}
    
    set_full_opacity : BoolProperty(name='Set Full Opacity',
        default=True, description='Check/Set full opacity') # , options={'SKIP_SAVE'}
    
    set_use_lights : BoolProperty(name='Disable Use Light',
        default=True, description='Check/Set use lights disabling') # , options={'SKIP_SAVE'}
    
    set_blend_mode : BoolProperty(name='Set Regular Blend Mode',
        default=True, description='Check/Set blend mode to regular') # , options={'SKIP_SAVE'}
    
    clear_frame_out_of_range : BoolProperty(name='Clear Frames Out Of Scene Range',
        default=False, description='Delete frames that before scene start and after scene end range\nWith a tolerance of one frame to avoid problem\nAffect all layers)') # , options={'SKIP_SAVE'}
    
    opacity_exclude_list : StringProperty(name='Skip',
        default='MA', description='Skip prefixes from this list when changing opacity\nSeparate multiple value with a comma (ex: MA,IN)') # , options={'SKIP_SAVE'}


    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GPENCIL'

    def invoke(self, context, event):
        # self.ctrl=event.ctrl
        # self.alt=event.alt
        if event.alt:
            self.all_objects=True
        # return self.execute(context)
        return context.window_manager.invoke_props_dialog(self)

    def draw(self, context):
        layout = self.layout
        layout.prop(self, 'all_objects')
        total = len([o for o in context.scene.objects if o.type == 'GPENCIL'])
        
        target_num = total if self.all_objects else len([o for o in context.selected_objects if o.type == 'GPENCIL'])
        layout.label(text=f'{target_num}/{total} targeted GP')

        layout.separator()
        layout.prop(self, 'clear_frame_out_of_range')
        layout.separator()
        layout.label(text='Set (or only perform a check):')
        row = layout.row()
        row.prop(self, 'set_full_opacity')
        if self.set_full_opacity:
            row.prop(self, 'opacity_exclude_list')
        layout.prop(self, 'set_use_lights')
        layout.prop(self, 'set_blend_mode')
        # layout.prop(self, 'clear_unused_view_layers')

    def execute(self, context): 
        if self.all_objects:
            pool = [o for o in context.scene.objects if o.type == 'GPENCIL']
        else:
            pool = [o for o in context.selected_objects if o.type == 'GPENCIL']
            # pool = [context.object]

        changes = []
        for ob in pool:
            changes.append(f'>> {ob.name}')
            layers = ob.data.layers
            
            if self.clear_frame_out_of_range:
                ct = fn.clear_frame_out_of_range(ob, verbose=False)
                if ct:
                    changes.append(f'{ct} out of range frame deleted')

            for l in layers:
                used = False
                
                ## mask check
                # if l.mask_layers:
                #     print(f'-> masks')
                #     state = '' if l.use_mask_layer else ' (disabled)' 
                #     print(f'{ob.name} > {l.info}{state}:')
                #     used = True
                #     for ml in l.mask_layers:
                #         mlstate = ' (disabled)' if ml.hide else ''
                #         mlinvert = ' <>' if ml.invert else ''
                #         print(f'{ml.info}{mlstate}{mlinvert}')

                if l.opacity != 1:
                    # TODO Skip zeroed opacity ?
                    # check if there is an exclusion word
                    if any(x.strip() + '_' in l.info for x in self.opacity_exclude_list.strip(',').split(',') if x):
                        print(f'Skipped layer : {l.info}')
                    else:
                        full_opacity_state = '' if self.set_full_opacity else ' (check only)'
                        mess = f'{l.info} : opacity {l.opacity:.2f} >> 1.0{full_opacity_state}' 
                        print(mess)
                        changes.append(mess)
                        if self.set_full_opacity:
                            l.opacity = 1.0
                        used = True

                if l.use_lights:

                    use_lights_state = '' if self.set_use_lights else ' (check only)'
                    mess = f'{l.info} : disable use lights{use_lights_state}'
                    print(mess)
                    changes.append(mess)
                    if self.set_use_lights:
                        l.use_lights = False
                    used = True

                if l.blend_mode != 'REGULAR':
                    blend_mode_state = '' if self.set_blend_mode else ' (check only)'
                    mess = f'{l.info} : blend mode "{l.blend_mode}" >> regular{blend_mode_state}'
                    print(mess)
                    changes.append(mess)
                    if self.set_blend_mode:
                        l.blend_mode = 'REGULAR'
                    used = True


                if used:
                    print()
            if changes:
                changes.append('')

        fn.show_message_box(_message=changes, _title="Layers Check Report", _icon='INFO')

        # render = bpy.data.scenes.get('Render')
        # if not render:
        #     print('SKIP, no Render scene')
        #     return {"CANCELLED"}
        
        return {"FINISHED"}

class GPEXP_OT_lower_layers_name(bpy.types.Operator):
    bl_idname = "gp.lower_layers_name"
    bl_label = "Normalize Layers Name"
    bl_description = "Make the object and layers name lowercase with dashed converted to underscore (without touching layer prefix and suffix)"
    bl_options = {"REGISTER", "UNDO"}

    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GPENCIL'

    all_objects : BoolProperty(name='On All Object',
        default=False, description='On All object, else use selected objects') # , options={'SKIP_SAVE'}
    
    object_name : BoolProperty(name='Normalize Object Name',
        default=True, description='Make the object name lowercase') # , options={'SKIP_SAVE'}
    
    layer_name : BoolProperty(name='Normalize Layers Names',
        default=True, description='Make the layers name lowercase') # , options={'SKIP_SAVE'}
    
    # dash_to_undescore : BoolProperty(name='Dash To Underscore',
    #     default=True, description='Make the layers name lowercase') # , options={'SKIP_SAVE'}

    def invoke(self, context, event):
        # self.ctrl=event.ctrl
        # self.alt=event.alt
        if event.alt:
            self.all_objects=True
        # return self.execute(context)
        return context.window_manager.invoke_props_dialog(self)

    def draw(self, context):
        layout = self.layout
        layout.prop(self, 'all_objects')
        if self.all_objects:
            gp_ct = len([o for o in context.scene.objects if o.type == 'GPENCIL'])
        else:
            gp_ct = len([o for o in context.selected_objects if o.type == 'GPENCIL'])
        
        layout.label(text=f'{gp_ct} to lower-case')
        layout.separator()
        layout.label(text=f'Choose what to rename:')
        layout.prop(self, 'object_name')
        layout.prop(self, 'layer_name')
        # if self.layer_name:
        #     box = layout.box()
        #     box.prop(self, 'dash_to_undescore')

        if not self.object_name and not self.layer_name:
            layout.label(text=f'At least one choice!', icon='ERROR')

    def execute(self, context):
        if self.all_objects:
            pool = [o for o in context.scene.objects if o.type == 'GPENCIL']
        else:
            pool = [o for o in context.selected_objects if o.type == 'GPENCIL']

        for ob in pool:

            if self.object_name:
                rename_data = ob.name == ob.data.name
                ob.name = ob.name.lower().replace('-', '_')
                if rename_data:
                    ob.data.name = ob.name

            if self.layer_name:
                for l in ob.data.layers:
                    # if self.dash_to_undescore:
                    l.info = l.info.replace('-', '_')
                    fn.normalize_layer_name(l) # default : lower=True, dash_to_underscore=self.dash_to_undescore

        return {"FINISHED"}

class GPEXP_OT_auto_number_object(bpy.types.Operator):
    bl_idname = "gp.auto_number_object"
    bl_label = "Auto Number Object"
    bl_description = "Automatic prefix number based on origin distance to camera and in_front values\nCtrl + Clic to delete name to delete numbering"
    bl_options = {"REGISTER", "UNDO"}

    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GPENCIL'

    all_objects : BoolProperty(name='On All GP Object',
        default=False, description='On All object, else use selected Grease Pencil objects') # , options={'SKIP_SAVE'}
    
    rename_data : BoolProperty(name='Rename Gpencil Data',
        default=True, description='Rename Also the Grease Pencil data using same name as object') # , options={'SKIP_SAVE'}
    
    delete : BoolProperty(default=False, options={'SKIP_SAVE'})

    def invoke(self, context, event):
        # if event.alt:
        #     self.all_objects=True
        if event.ctrl or self.delete:
            regex_num = re.compile(r'^(\d{3})_')
            ct = 0
            gps = [o for o in context.selected_objects if o.type == 'GPENCIL']
            for o in gps:
                if regex_num.match(o.name):
                    o.name = o.name[4:]
                    ct += 1
                self.report({'INFO'}, f'{ct}/{len(gps)} number prefix removed from object names')
                
            return {"FINISHED"}

        return context.window_manager.invoke_props_dialog(self)

    def draw(self, context):
        layout = self.layout
        layout.prop(self, 'all_objects')
        if self.all_objects:
            gp_ct = len([o for o in context.scene.objects if o.type == 'GPENCIL'])
        else:
            gp_ct = len([o for o in context.selected_objects if o.type == 'GPENCIL'])
        
        layout.prop(self, 'rename_data')
        layout.label(text=f'{gp_ct} objects to renumber')
        if not gp_ct:
            layout.label(text='No Gpencil object to renumber', icon = 'ERROR')

    def execute(self, context):
        if self.all_objects:
            pool = [o for o in context.scene.objects if o.type == 'GPENCIL']
        else:
            pool = [o for o in context.selected_objects if o.type == 'GPENCIL']

        def reversed_enumerate(collection: list):
            for i in range(len(collection)-1, -1, -1):
                yield i, collection[i]

        fronts = []

        ## separate In Front objects:

        for i, o in reversed_enumerate(pool):
            if o.show_in_front:
                fronts.append(pool.pop(i))        
                
        cam_loc = context.scene.camera.matrix_world.to_translation()

        # filter by distance to camera object (considering origins)
        pool.sort(key=lambda x: math.dist(x.matrix_world.to_translation(), cam_loc))
        fronts.sort(key=lambda x: math.dist(x.matrix_world.to_translation(), cam_loc))
        # re-insert fitlered infront object before others
        pool = fronts + pool

        ct = 10
        regex_num = re.compile(r'^(\d{3})_')
        for o in pool:
            renum = regex_num.search(o.name)
            
            if not renum:
                o.name = f'{str(ct).zfill(3)}_{o.name}'
            
            else:
                ## either replace or leave untouched
                # continue
                o.name =  f'{str(ct).zfill(3)}_{o.name[4:]}'
            
            ct += 10
            if self.rename_data and o.name != o.data.name:
                o.data.name = o.name

        return {"FINISHED"}

classes=(
GPEXP_OT_layers_state,
GPEXP_OT_lower_layers_name,
GPEXP_OT_auto_number_object
)

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

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