//! TUI state

use ratatui::crossterm::event::KeyEvent;
use ratatui::widgets::TableState;

use crate::places::db_repository::DbPlacesRepository;
use crate::places::models::Place;
use crate::places::repository::PlacesRepository;

use super::ui::Message;

pub struct State {
    pub height: u16,
    pub page: u32,
    pub mode: Mode,
    places_repository: DbPlacesRepository,
    pub places: Vec<Place>,
    places_status: DataStatus,
    pub confirmation: Option<ConfirmationStatus>,
    pub selected_place: TableState,
    pub ui_messages: Vec<Message>,
    pub quit: bool,
}

#[derive(Copy, Clone)]
pub enum Mode {
    List,
    Edit,
}

enum DataStatus {
    Fresh,
    Old,
}

pub enum ConfirmationStatus {
    Deletion(i64),
    Save(Place),
}

impl State {
    pub fn new(places_repository: DbPlacesRepository, height: u16) -> Self {
        Self {
            height,
            page: 0,
            mode: Mode::List,
            places_repository,
            places_status: DataStatus::Old,
            places: vec![],
            selected_place: TableState::default(),
            confirmation: None,
            ui_messages: Vec::new(),
            quit: false,
        }
    }

    pub fn set_list_mode(&mut self) {
        self.mode = Mode::List;
        self.push_mode_change();
    }

    pub fn set_edit_mode(&mut self) {
        self.mode = Mode::Edit;
        self.push_mode_change();

        let Some(selection) = self.selected_place.selected() else {
            return;
        };
        let Some(place) = self.places.get(selection) else {
            return;
        };
        self.ui_messages.push(Message::EditPlace(place.clone()))
    }

    fn push_mode_change(&mut self) {
        self.ui_messages.push(Message::UpdateAppMode(self.mode));
    }

    pub fn next_page(&mut self) {
        self.page += 1;
        self.places_status = DataStatus::Old;
        self.push_page_change();
    }

    pub fn prev_page(&mut self) {
        self.page = self.page.saturating_sub(1);
        self.places_status = DataStatus::Old;
        self.push_page_change();
    }

    fn push_page_change(&mut self) {
        self.ui_messages.push(Message::UpdatePage(self.page));
    }

    pub fn edit_next(&mut self) {
        self.ui_messages.push(Message::EditNext);
    }

    pub fn edit_prev(&mut self) {
        self.ui_messages.push(Message::EditPrev);
    }

    pub fn edit_input(&mut self, key_event: KeyEvent) {
        self.ui_messages.push(Message::Input(key_event));
    }

    pub async fn fetch_places(&mut self) {
        if let DataStatus::Fresh = self.places_status {
            return;
        }
        let limit = (self.height as u8).saturating_sub(3);
        let offset = (limit as u32) * self.page;
        match self
            .places_repository
            .get_places_paginated(offset, limit)
            .await
        {
            Ok(places) => {
                self.places = places;
                if !self.places.is_empty() {
                    self.selected_place.select(Some(0));
                }
            }
            Err(err) => {
                tracing::error!("{err}");
            }
        }
        self.places_status = DataStatus::Fresh;
        self.ui_messages
            .push(Message::UpdatePlaces(self.places.clone()))
    }

    pub fn confirm_deletion(&mut self) {
        if let Some(Some(id)) = self
            .selected_place
            .selected()
            .map(|index| self.places.get(index).map(|p| p.id))
        {
            self.confirmation = Some(ConfirmationStatus::Deletion(id))
        }
    }

    pub fn start_save(&mut self) {
        if let Some(Some(id)) = self
            .selected_place
            .selected()
            .map(|index| self.places.get(index).map(|p| p.id))
        {
            self.ui_messages.push(Message::SavePlace(id));
        }
    }

    pub fn confirm_save(&mut self, place: Place) {
        self.confirmation = Some(ConfirmationStatus::Save(place));
    }

    pub fn cancel_confirmation(&mut self) {
        self.confirmation = None;
    }

    pub async fn proceed_confirmation(&mut self) {
        let Some(confirmation) = &self.confirmation else {
            return;
        };

        match confirmation {
            ConfirmationStatus::Deletion(id) => {
                if let Err(err) = self.places_repository.delete_place(*id).await {
                    tracing::error!("{err}");
                }
            }
            ConfirmationStatus::Save(place) => {
                if let Err(err) = self.places_repository.update_place(place.clone()).await {
                    tracing::error!("{err}");
                }
                self.mode = Mode::List;
                self.push_mode_change();
            }
        }

        self.confirmation = None;
        self.places_status = DataStatus::Old;
    }
}