use crate::message_navigation;
use crate::state_update;
use crate::view_navigation;
use std::sync::{Arc, Mutex};
use iced::{Element, Task};
use iced::keyboard::Event;
use crate::{fill_state, AppState };
use crate::data_provider::sqlite::create_db;
use crate::dictionary::{DictionaryMessage, DictionaryState};
use crate::dictionary_test::{DictionaryQuizMessage, DictionaryQuizState};
use crate::history::{HistoryMessage, HistoryState};
use crate::navigation::Page::*;
use crate::navigation::RootMessage::Keyboard;
use crate::quiz::{QuizMessage, QuizState};
use crate::randomizer::randomizer::{RandomizerMessage, RandomizerState};
use crate::repetition::{RepetitionMessage, RepetitionState};
use crate::repetitions::{RepetitionsMessage, RepetitionsState};
use crate::selector::{SelectorMessage, SelectorState};
use crate::sync::{SyncMessage, SyncState};
use crate::word::{WordMessage, WordState};
use crate::writing::{WritingMessage, WritingState};


impl Default for ScreenState {
    fn default() -> Self {
        let mut state = AppState::new();
        fill_state(&mut state);
        let state = Arc::new(Mutex::new(state));
        ScreenState {
            stack: vec![Page::Selector(SelectorState::new(state.clone()))],
        }
    }
}

#[derive(Clone)]
pub enum RootMessage {
    Selector(SelectorMessage),
    Quiz(QuizMessage),
    Writing(WritingMessage),
    Dictionary(DictionaryMessage),
    DictionaryQuiz(DictionaryQuizMessage),
    Randomizer(RandomizerMessage),
    Repetitions(RepetitionsMessage),
    Repetition(RepetitionMessage),
    Word(WordMessage),
    Sync(SyncMessage),
    History(HistoryMessage),
    Keyboard(Event),
}

pub enum Page {
    Selector(SelectorState),
    Quiz(QuizState),
    Writing(WritingState),
    Dictionary(DictionaryState),
    DictionaryQuiz(DictionaryQuizState),
    Randomizer(RandomizerState),
    Repetitions(RepetitionsState),
    Repetition(RepetitionState),
    Word(WordState),
    Sync(SyncState),
    History(HistoryState),
    PreviousPage,
}




pub struct ScreenState {
    stack: Vec<Page>,
}

impl ScreenState {
    pub fn boot() -> (ScreenState, Task<RootMessage>) {
        create_db();
        (ScreenState::default(), Task::none())
    }
    pub fn update(&mut self, message: RootMessage) -> Task<RootMessage> {
        if let Keyboard(e) = message {
            return self.handle_keyboard(e);
        }

        state_update!(
            message,
            self.stack,
            Selector,
            Quiz,
            Writing,
            Dictionary,
            DictionaryQuiz,
            Randomizer,
            Repetitions,
            Repetition,
            Word,
            Sync,
            History
        );
        Task::none()
    }
    pub fn view(&self) -> Element<'_, RootMessage> {
        view_navigation!(
            self.stack,
            Quiz,
            Selector,
            Writing,
            Dictionary,
            DictionaryQuiz,
            Randomizer,
            Repetitions,
            Repetition,
            Word,
            Sync,
            History
        )
    }

    fn handle_keyboard(&mut self, message: Event) -> Task<RootMessage> {
        let page = self.stack.last_mut().unwrap();
        match page {
            Page::Repetition(page) => page.press(&message),
            _ => Task::none(),
        }
    }
}

pub struct AppSettings {
    pub(crate) key: Option<String>,
}

#[macro_export]
macro_rules! view_navigation {
    ($stack:expr, $($e:ident), *) => {
        match &$stack.last().unwrap() {
            $(
            $e(s) => s.view().map(RootMessage::$e),
            )*
            _ => iced::widget::space().into(),
        }
    }
}

#[macro_export]
macro_rules! state_update {
    ($message:expr, $stack:expr, $($e:ident), *) => {
        match $message {
            $(
            RootMessage::$e(msg) => {
                if let $e(s) = $stack.last_mut().unwrap() {
                    message_navigation!(msg, $stack, s)
                }
            }
            )*
            _ => {}
        }
    }
}

#[macro_export]
macro_rules! message_navigation {
    ($msg:expr, $stack:expr, $state:expr) => {
        if let Some(new_page) = $state.navigate(&$msg) {
            if let Page::PreviousPage = new_page {
                $stack.pop();
                return Task::none();
            }
            $stack.push(new_page);
        } else {
            return $state.update($msg);
        }
    };
}

pub trait NavigatedPage<T> {
    fn navigate(&self, message: &T) -> Option<Page>;
}

pub trait KeyPressedPage {
    fn press(&mut self, message: &Event) -> Task<RootMessage>;
}