use crate::AppState;
use crate::data_provider::card_sets::{delete_set, update_deck};
use crate::lang::DeckSettings;
use crate::navigation::Page::PreviousPage;
use crate::navigation::{NavigatedPage, Page, RootMessage};
use crate::repetition_settings::RepetitionSettingsMessage::*;
use crate::styling::*;
use iced::widget::button::danger;
use iced::widget::{button, column, row, scrollable, space, text, text_input};
use iced::{Element, Task};
use iced_core::Length::Fill;
use iced_core::Padding;
use std::sync::{Arc, Mutex};
use std::time::Duration;

pub struct RepetitionSettingsState {
    set: DeckSettings,
    index: usize,
    state: Arc<Mutex<AppState>>,
    real_delete: bool,
}

impl RepetitionSettingsState {
    pub(crate) fn new(index: usize, p1: Arc<Mutex<AppState>>) -> RepetitionSettingsState {
        let set;
        {
            let local_state = p1.lock().unwrap();
            set = local_state.decks[index].clone();
        }
        RepetitionSettingsState {
            index,
            set,
            state: p1,
            real_delete: false,
        }
    }
}

impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
    fn navigate(&mut self, message: &RepetitionSettingsMessage) -> Option<Page> {
        if let Back = message {
            Some(PreviousPage)
        } else {
            None
        }
    }

    fn navigated(&mut self) {}
    fn update(&mut self, message: RepetitionSettingsMessage) -> Task<RootMessage> {
        match message {
            Back => {}
            Save => {
                let mut state = self.state.lock().unwrap();
                update_deck(&mut self.set, &state.connection);
                state.decks[self.index] = self.set.clone();
            }
            SetName(new) => {
                self.set.name = new;
            }
            SetForward(new) => {
                self.set.forward = new;
            }
            SetBackward(backward) => {
                self.set.backward = backward;
            }
            SetFilter(new) => {
                self.set.filter = new;
            }
            TryFilter => {
                let state = self.state.lock().unwrap();
                let count = self.set.get_word_list(&state).len();
                self.set.count = Some(count);
            }
            DeleteSet => {
                if !self.real_delete {
                    self.real_delete = true;
                    return Task::future(async {
                        tokio::time::sleep(Duration::from_millis(3000)).await;
                        RootMessage::RepetitionSettings(RevertDeleteSet)
                    });
                }
                let mut state = self.state.lock().unwrap();
                delete_set(&self.set, &state.connection);
                state.decks.remove(self.index);
                return Task::done(RootMessage::RepetitionSettings(Back));
            }
            RevertDeleteSet => self.real_delete = false,
        }
        Task::none()
    }

    fn view(&self) -> Element<'_, RepetitionSettingsMessage> {
        back_overlay(
            iced::widget::column![
                scrollable(
                    column![
                        column![
                            text!("Название набора"),
                            text_input("", &self.set.name).on_input(SetName),
                        ]
                        .spacing(QUARTER_SPACING),
                        column![
                            text!("Передняя сторона"),
                            text_input("", &self.set.forward).on_input(SetForward),
                        ]
                        .spacing(QUARTER_SPACING),
                        column![
                            text!("Задняя сторона"),
                            text_input("", &self.set.backward).on_input(SetBackward),
                        ]
                        .spacing(QUARTER_SPACING),
                        column![
                            text!("Фильтр"),
                            text_input("", &self.set.filter).on_input(SetFilter),
                            button("Проверить фильтр")
                                .style(jl_button)
                                .on_press(TryFilter),
                            self.count_view(&self.set),
                        ]
                        .spacing(QUARTER_SPACING),
                    ]
                    .spacing(DEFAULT_SPACING)
                    .padding(Padding {
                        top: 0.0,
                        right: DEFAULT_SPACING,
                        bottom: 0.0,
                        left: 0.0,
                    })
                )
                .height(Fill),
                row![
                    button("Сохранить").style(jl_button).on_press(Save),
                    button(if self.real_delete {
                        "Вы уверены?"
                    } else {
                        "Удалить"
                    })
                    .style(danger)
                    .on_press(DeleteSet),
                    space().width(Fill),
                ]
                .spacing(DEFAULT_SPACING),
            ]
            .spacing(DEFAULT_SPACING)
            .into(),
            Back,
        )
    }
}

impl RepetitionSettingsState {
    fn count_view(&self, set: &DeckSettings) -> Element<'_, RepetitionSettingsMessage> {
        if let Some(count) = set.count {
            return text!("Количество слов: {}", count).into();
        }
        space().into()
    }
}

#[derive(Clone)]
pub enum RepetitionSettingsMessage {
    Back,
    Save,
    SetName(String),
    SetForward(String),
    SetBackward(String),
    SetFilter(String),
    TryFilter,
    DeleteSet,
    RevertDeleteSet,
}