use crate::app::AppState;
use crate::data::repositories::Repository;
use crate::data_provider::settings::{delete_settings, set_setting};
use crate::data_provider::web_api::*;
use crate::jl_button;
use crate::navigation::Page::PreviousPage;
use crate::navigation::{NavigatedPage, Page, RootMessage};
use crate::notification::{NotificationData, NotificationRequest};
use crate::pages::sync::SyncMessage::*;
use crate::styling::*;
use crate::{push_error, push_error_task};
use iced::widget::button::danger;
use iced::widget::container::rounded_box;
use iced::widget::{button, column, container, progress_bar, row, space, text, toggler};
use iced::{Center, Element, Fill, Font, Length, Task};
use log::error;
use std::time::Duration;
use crate::notification::NotificationData::LocalVersionChanged;

#[derive(Clone)]
pub enum SyncMessage {
    Back,
    CopyKey,
    KeyCopied,
    IdReceived(String),
    InitSync,
    GetKey,
    Send,
    GetLast,
    NextAnimation,
    NetworkFinished,
    Disable,
    DisableSync,
    SwitchAutoSync,
    ResetRealLoad,
}
pub struct SyncState {
    state: AppState,
    auto_fetch: bool,
    frozen: bool,
    real_load: bool,
    progress: f32,
}

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

    fn navigated(&mut self) {}
    fn update(&mut self, message: SyncMessage) -> Task<RootMessage> {
        match message {
            Back => {}
            CopyKey => {
                let key = self.state.sync_data.read().key.clone().unwrap();
                return iced::clipboard::write(key)
                    .map(|_val: String| RootMessage::Sync(KeyCopied));
            }
            InitSync => {
                return Task::perform(first_sync(), |id| match id {
                    Ok(id) => RootMessage::Sync(IdReceived(id)),
                    Err(err) => push_error!(err),
                });
            }
            GetKey => {
                return iced::clipboard::read()
                    .map(|key| RootMessage::Sync(IdReceived(key.unwrap_or_else(String::new))));
            }
            KeyCopied => {}
            IdReceived(new_id) => {
                if !validate_id(&new_id) {
                    return Task::none();
                }
                let mut settings = self.state.sync_data.write();
                settings.key = Some(new_id.clone());
                if let Err(err) = set_setting(
                    "SYNC_KEY".to_string(),
                    new_id,
                    &self.state.connection.lock(),
                ) {
                    return push_error_task!(err);
                }
            }
            Send => {
                self.prepare_to_db_interaction();

                let id = self.state.sync_data.read().key.clone().unwrap();
                let tasks = Task::batch([
                    Task::perform(
                        async { tokio::time::sleep(Duration::from_millis(200)).await },
                        |_| RootMessage::Sync(NextAnimation),
                    ),
                    Task::perform(send_data(id), |_| RootMessage::Sync(NetworkFinished)),
                ]);

                return tasks;
            }
            GetLast => {
                if !self.real_load {
                    self.real_load = true;
                    return Task::batch([
                        Task::future(async {
                            tokio::time::sleep(Duration::from_millis(3000)).await;
                            RootMessage::Sync(ResetRealLoad)
                        }),
                        Task::done(RootMessage::PushNotification(NotificationRequest::Warning(LocalVersionChanged)))
                    ]);
                }

                self.real_load = false;
                let id = self.state.sync_data.read().key.clone().unwrap();
                self.state.connection.lock().finish();
                let tasks = Task::batch([
                    Task::perform(
                        async { tokio::time::sleep(Duration::from_millis(200)).await },
                        |_| RootMessage::Sync(NextAnimation),
                    ),
                    Task::perform(load_data(id, false), |load_result| match load_result {
                        Ok(_) => RootMessage::Sync(NetworkFinished),
                        Err(error) => push_error!(error)
                    }),
                ]);

                return tasks;
            }
            NextAnimation => {
                self.progress += 1.0;
                if self.progress > 5.0 {
                    self.progress = 0.0;
                }
                if self.frozen {
                    return Task::perform(
                        async { tokio::time::sleep(Duration::from_millis(200)).await },
                        |_| RootMessage::Sync(NextAnimation),
                    );
                }
            }
            NetworkFinished => {
                self.frozen = false;
                {
                    let mut connection = self.state.connection.lock();
                    connection.restart();
                }

                if let Err(err) = self.reload_data() {
                    return push_error_task!(err);
                }

                return Task::done(RootMessage::PushNotification(NotificationRequest::Info(
                    NotificationData::DataSynced,
                )));
            }
            Disable => {}
            DisableSync => {
                let mut sync_data = self.state.sync_data.write();
                let connection = self.state.connection.lock();
                sync_data.key = None;
                let save_result = || {
                    delete_settings("SYNC_KEY".to_string(), &connection)?;
                    delete_settings("AUTO_WEB_FETCH".to_string(), &connection)?;
                    Ok::<(), NotificationData>(())
                };

                if let Err(error) = save_result() {
                    return push_error_task!(error);
                }
            }
            SwitchAutoSync => {
                self.auto_fetch = !self.auto_fetch;
                let mut sync_data = self.state.sync_data.write();
                let connection = self.state.connection.lock();

                sync_data.auto_web_fetch = self.auto_fetch;
                if let Err(err) = set_setting(
                    "AUTO_WEB_FETCH".to_string(),
                    self.auto_fetch.to_string(),
                    &connection,
                ) {
                    return push_error_task!(err);
                }
            }
            ResetRealLoad => {
                self.real_load = false;
            }
        }
        Task::none()
    }

    fn view(&self) -> Element<'_, SyncMessage> {
        back_overlay(
            row![space().width(Fill), self.sync_column(), space().width(Fill)]
                .spacing(DEFAULT_SPACING)
                .width(Fill)
                .into(),
            Back,
        )
    }
}

impl SyncState {
    pub fn new(state: AppState) -> SyncState {
        let auto_fetch = state.sync_data.read().auto_web_fetch;

        Self {
            auto_fetch,
            state,
            frozen: false,
            real_load: false,
            progress: 0.0,
        }
    }

    fn reload_data(&mut self) -> Result<(), NotificationData> {
        self.state.card_states.write().reload()?;
        self.state.word_groups.write().reload()?;
        self.state.decks.write().reload()?;
        self.state.dictionary.write().reload()?;
        self.state.history.write().reload()?;
        self.state.exam.write().reload()?;
        self.state.exam_entries.write().reload()?;
        Ok(())
    }

    fn sync_column(&self) -> Element<'_, SyncMessage> {
        let network_view: Element<'_, SyncMessage> = if self.frozen {
            progress_bar(0.0..=5.0, self.progress).into()
        } else {
            space().into()
        };
        {
            if let Some(key) = self.state.sync_data.read().key.as_ref() {
                column![
                    text!("Ваш ключ синхронизации"),
                    container(
                        container(
                            text!("{}", key)
                                .size(ACCENT_FONT_SIZE)
                                .font(Font::MONOSPACE)
                        )
                        .padding(3)
                    )
                    .style(rounded_box),
                    jl_button!("Скопировать в буфер обмена")
                        .on_press(CopyKey)
                        .width(Fill),
                    row![
                        jl_button!("↑ Отправить").on_press(Send),
                        space().width(Fill),
                        jl_button!("↓ Скачать").on_press(GetLast)
                    ]
                    .spacing(DEFAULT_SPACING),
                    toggler(self.auto_fetch)
                        .label("Автоматическая синхронизация")
                        .on_toggle(|_| SwitchAutoSync),
                    container(network_view).width(Fill),
                    button("Отключить синхронизацию")
                        .style(danger)
                        .on_press(DisableSync),
                ]
            } else {
                column![
                    jl_button!("Создать сохранение").on_press(InitSync),
                    jl_button!("Вставить ключ из буфера").on_press(GetKey),
                ]
            }
        }
        .spacing(DEFAULT_SPACING)
        .align_x(Center)
        .width(Length::Shrink)
        .into()
    }

    /*    fn app_updater(&self) -> Element<'_, SyncMessage> {
        column![].width(Fill).into()
    }*/

    fn prepare_to_db_interaction(&mut self) {
        if self.frozen {
            return;
        }
        self.frozen = true;
        self.progress = 0.0;
        let mut connection = self.state.connection.lock();

        connection
            .query_row("PRAGMA wal_checkpoint(TRUNCATE)", [], |_| Ok(()))
            .unwrap_or_else(|e| {
                error!("Ошибка при checkpoint WAL: {e}");
            });
        connection.execute("VACUUM;", []).unwrap_or_else(|e| {
            error!("Ошибка при checkpoint WAL: {e}");
            0
        });
        connection
            .execute("PRAGMA optimize;", [])
            .unwrap_or_else(|e| {
                error!("Ошибка при checkpoint WAL: {e}");
                0
            });
        connection.finish();
    }
}

#[inline]
fn validate_id(id: &str) -> bool {
    id.len() == 24 && id.chars().all(|c| c.is_ascii_alphanumeric())
}