from aiogram.fsm.context import FSMContext
from aiogram.types import Message, CallbackQuery

from .context import ContextData, CallbackCommand


async def save_navigation_context(callback_data: ContextData, state: FSMContext) -> list[ContextData]:
    data = await state.get_data()
    stack = [ContextData.unpack(item) for item in data.get("navigation_stack", [])]
    data_nc = data.get("navigation_context")
    navigation_context = ContextData.unpack(data_nc) if data_nc else None
    if callback_data.back:
        callback_data.back = False 
        if stack:
            stack.pop()
    else:
        if stack and navigation_context and navigation_context.command == callback_data.command:
            navigation_context = callback_data
        elif navigation_context:
            stack.append(navigation_context)

    await state.update_data({"navigation_stack": [item.pack() for item in stack],
                             "navigation_context": callback_data.pack()})
    return stack


def pop_navigation_context(stack: list[ContextData]) -> ContextData | None:
    if stack:
        data = stack[-1]
        data.back = True
        return data
    

async def get_navigation_context(state: FSMContext) -> tuple[list[ContextData], ContextData | None]:
    data = await state.get_data()
    data_nc = data.get("navigation_context")
    context = ContextData.unpack(data_nc) if data_nc else None
    return ([ContextData.unpack(item) for item in data.get("navigation_stack", [])],
            context)


async def clear_state(state: FSMContext, clear_nav: bool = False):
    if clear_nav:
        await state.clear()
    else:
        state_data = await state.get_data()
        stack = state_data.get("navigation_stack")
        context = state_data.get("navigation_context")
        update_data = {}
        if stack:
            update_data["navigation_stack"] = stack
        if context:
            update_data["navigation_context"] = context
        await state.clear()
        await state.update_data(update_data)


async def route_callback(message: Message | CallbackQuery, back: bool = True, **kwargs):

    stack, context = await get_navigation_context(kwargs["state"])
    if back:
        context = pop_navigation_context(stack)
        stack = await save_navigation_context(callback_data = context, state = kwargs["state"])
    kwargs.update({"callback_data": context, "navigation_stack": stack})
    if context:
        if context.command == CallbackCommand.MENU_ENTRY_MAIN:
            await main_menu(message, **kwargs)
        elif context.command == CallbackCommand.MENU_ENTRY_SETTINGS:
            await settings_menu(message, **kwargs)
        elif context.command == CallbackCommand.MENU_ENTRY_PARAMETERS:
            await parameters_menu(message, **kwargs)
        elif context.command == CallbackCommand.MENU_ENTRY_LANGUAGE:
            await language_menu(message, **kwargs)
        elif context.command == CallbackCommand.MENU_ENTRY_ENTITIES:
            await entities_menu(message, **kwargs)
        elif context.command == CallbackCommand.ENTITY_LIST:
            await entity_list(message, **kwargs)
        elif context.command == CallbackCommand.ENTITY_ITEM:
            await entity_item(message, **kwargs)

        else:
            raise ValueError(f"Unknown command {context.command}")
    else:
        raise ValueError("No navigation context")


from .menu.main import main_menu
from .menu.settings import settings_menu
from .menu.parameters import parameters_menu
from .menu.language import language_menu
from .menu.entities import entities_menu
from .forms.entity_list import entity_list
from .forms.entity_form import entity_item