import json

import bpy
from bpy.types import PropertyGroup, Operator
from bpy.props import (CollectionProperty, EnumProperty, StringProperty)

from vse_toolbox.constants import CASTING_BUFFER
from vse_toolbox.sequencer_utils import get_strips
from vse_toolbox.bl_utils import (get_addon_prefs, get_scene_settings, get_strip_settings)


class VSETB_OT_casting_replace(Operator):
    bl_idname = "vse_toolbox.casting_replace"
    bl_label = "Replace Asset"
    bl_description = "Replace Asset of selected strips"

    old_asset : StringProperty()
    new_asset : StringProperty()

    assets : CollectionProperty(type=PropertyGroup)

    def execute(self, context):
        prefs = get_addon_prefs()
        settings = get_scene_settings()

        new_asset = next(a for a in settings.active_project.assets if a.tracker_name == self.new_asset)

        for strip in get_strips('Shots', selected_only=True):
            strip_settings = strip.vsetb_strip_settings
            for asset_casting in strip_settings.casting:
                if asset_casting.asset.tracker_name == self.old_asset:
                    
                    print(f'Replace casting on {strip.name}')

                    asset_casting.name = new_asset.name 
                    asset_casting.id = new_asset.id
                    asset_casting['_name'] = new_asset.label

                    strip_settings.casting.update()

        self.assets.clear()

        return {'FINISHED'}

    def invoke(self, context, event):
        settings = get_scene_settings()
        project = settings.active_project

        self.assets.clear()
        for asset in project.assets:
            item = self.assets.add()
            item.name = asset.tracker_name

        strip = context.active_sequence_strip
        asset_casting_index = strip.vsetb_strip_settings.casting_index
        active_asset = strip.vsetb_strip_settings.casting[asset_casting_index].asset

        self.old_asset = active_asset.tracker_name
        self.new_asset = ''
        
        return context.window_manager.invoke_props_dialog(self)
        #

    def draw(self, context):
        scn = context.scene
        settings = get_scene_settings()

        project = settings.active_project

        layout = self.layout
        col = layout.column()
        col.use_property_split = True 
        col.prop_search(self, 'old_asset', self, 'assets', text='Old Asset', icon='ASSET_MANAGER')
        col.prop_search(self, 'new_asset', self, 'assets', text='New Asset', icon='ASSET_MANAGER')


def get_asset_items(self, context):
    settings = get_scene_settings()
    project = settings.active_project

    return [(a.id, a.label, '', i) for i, a in enumerate(project.assets)]

class VSETB_OT_casting_add(Operator):
    bl_idname = "vse_toolbox.casting_add"
    bl_label = "Casting Add"
    bl_description = "Add Asset to Castin"
    bl_options = {"REGISTER", "UNDO"}
    bl_property = "asset_name"

    asset_name : EnumProperty(name='', items=get_asset_items)
    @classmethod
    def poll(cls, context):
        active_strip = context.scene.sequence_editor.active_strip
        if active_strip:
            return True

    def invoke(self, context, event):
        context.window_manager.invoke_search_popup(self)
        return {'FINISHED'}

    def execute(self, context):
        scn = context.scene
        active_strip = scn.sequence_editor.active_strip

        settings = get_scene_settings()
        strip_settings = get_strip_settings()

        project = settings.active_project

        if strip_settings.casting.get(self.asset_name):
            asset = project.assets[self.asset_name]
            self.report({'WARNING'}, f"Asset {asset.label} already casted.") 
            return {"CANCELLED"}

        item = strip_settings.casting.add()
        asset = project.assets[self.asset_name]

        item.name = asset.name 
        item.id = project.assets[self.asset_name].id
        item['_name'] = asset.label

        strip_settings.casting.update()
        
        return {"FINISHED"}


class VSETB_OT_casting_remove(Operator):
    bl_idname = "vse_toolbox.casting_remove"
    bl_label = "Remove Item from Casting"
    bl_description = "Remove Item from Casting"
    bl_options = {"REGISTER", "UNDO"}

    @classmethod
    def poll(cls, context):
        active_strip = context.scene.sequence_editor.active_strip
        if active_strip:
            return True

    def invoke(self, context, event):
        scn = context.scene
        
        strip_settings = get_strip_settings()
        idx = strip_settings.casting_index

        try:
            item = strip_settings.casting[idx]
        except IndexError:
            pass
        else:
            item = strip_settings.casting[strip_settings.casting_index]
            label = item.asset.label if item.asset.label else 'Empty'
            info = f"Item {label} removed from casting"
            strip_settings.casting.remove(idx)

            if strip_settings.casting_index == 0:
                strip_settings.casting_index = 0
            else:
                strip_settings.casting_index -= 1
                
            self.report({'INFO'}, info)

        return {"FINISHED"}


class VSETB_OT_casting_move(Operator):
    bl_idname = "vse_toolbox.casting_move"
    bl_label = "Move Casting items"
    bl_description = "Move Casting items"
    bl_options = {"REGISTER", "UNDO"}

    direction: EnumProperty(
        items=(
            ('UP', "Up", ""),
            ('DOWN', "Down", ""),
        )
    )

    asset_name : StringProperty()

    @classmethod
    def poll(cls, context):
        active_strip = context.scene.sequence_editor.active_strip
        if active_strip:
            return True

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

        strip_settings = get_strip_settings()
        idx = strip_settings.casting_index

        try:
            item = strip_settings.casting[idx]
        except IndexError:
            pass
        else:
            if self.direction == 'DOWN' and idx < len(strip_settings.casting) - 1:
                item_next = strip_settings.casting[idx+1].name
                strip_settings.casting.move(idx, idx+1)
                strip_settings.casting_index += 1

            elif self.direction == 'UP' and idx >= 1:
                item_prev = strip_settings.casting[idx-1].name
                strip_settings.casting.move(idx, idx-1)
                strip_settings.casting_index -= 1

            info = f"Item {item.asset.label} moved to position {(item.asset.label, strip_settings.casting_index + 1)}"
            self.report({'INFO'}, info)

        return {"FINISHED"}

class VSETB_OT_copy_casting(Operator):
    bl_idname = "vse_toolbox.copy_casting"
    bl_label = "Copy Casting"
    bl_description = "Copy Casting from active strip"
    bl_options = {"REGISTER", "UNDO"}

    @classmethod
    def poll(cls, context):
        active_strip = context.scene.sequence_editor.active_strip
        strip_settings = get_strip_settings()
        
        if active_strip and strip_settings.casting:
            return True

    def execute(self, context):
        scn = context.scene
        
        active_strip = scn.sequence_editor.active_strip
        strip_settings = get_strip_settings()
        
        datas = [c.to_dict() for c in strip_settings.casting]
        CASTING_BUFFER.write_text(json.dumps(datas), encoding='utf-8')
        
        return {"FINISHED"}


class VSETB_OT_paste_casting(Operator):
    bl_idname = "vse_toolbox.paste_casting"
    bl_label = "Paste Casting"
    bl_description = "Paste Casting to active strip"
    bl_options = {"REGISTER", "UNDO"}

    @classmethod
    def poll(cls, context):
        active_strip = context.scene.sequence_editor.active_strip
        if active_strip:
            return True

    def execute(self, context):
        scn = context.scene
        strip_settings = get_strip_settings()

        if not CASTING_BUFFER.exists():
            self.report({'ERROR'}, f'No Casting to copy.')
            return {"CANCELLED"}

        casting_datas = json.loads(CASTING_BUFFER.read_text())



        for strip in context.selected_sequences:
            strip_settings = strip.vsetb_strip_settings
            for casting_data in casting_datas:
    
                item = strip.vsetb_strip_settings.casting.add()

                item.name = casting_data['name'] 
                item.id = casting_data['id'] 
                item['_name'] = casting_data['_name'] 

                strip_settings.casting.update()

        return {"FINISHED"}


class VSETB_OT_copy_metadata(Operator):
    bl_idname = "vse_toolbox.copy_metadata"
    bl_label = "Copy metadata to selected"
    bl_description = "Copy Metadata to selected strips"

    metadata : StringProperty()

    @classmethod
    def poll(cls, context):
        return context.selected_sequences and context.active_sequence_strip

    def execute(self, context):
        prefs = get_addon_prefs()
        settings = get_scene_settings()
        project = settings.active_project

        metadata = next((m.field_name for m in project.metadata_types if m.name == self.metadata), None)

        if not metadata:
            self.report({'ERROR'}, f'No Metadata named {self.metadata}')

        active_strip = context.active_sequence_strip
        metadata_value = getattr(active_strip.vsetb_strip_settings.metadata, metadata)
        
        for strip in context.selected_sequences:
            if strip == context.active_sequence_strip:
                continue

            setattr(strip.vsetb_strip_settings.metadata, metadata, metadata_value)

        return {"FINISHED"}


classes = (
    VSETB_OT_casting_add,
    VSETB_OT_casting_remove,
    VSETB_OT_casting_move,
    VSETB_OT_copy_casting,
    VSETB_OT_paste_casting,
    VSETB_OT_casting_replace,
    VSETB_OT_copy_metadata
)

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

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