use color_eyre::Result;
use crossterm::event::{KeyCode, KeyEvent};
use ratatui::{
    layout::{Constraint, Layout, Rect},
    Frame,
};

use std::sync::mpsc::Sender;
use tokio::sync::mpsc::UnboundedSender;

use super::Component;
use crate::{action::Action, app::Mode, config::Config};

mod event_log;
mod peers;
mod stash_info;
mod nominators;
mod listen_addresses;
mod history;
mod withdrawals;
mod stash_details;
mod staking_details;
mod reward_details;
mod bond_popup;
mod payout_popup;
mod rotate_popup;

use stash_details::StashDetails;
use staking_details::StakingDetails;
use reward_details::RewardDetails;
use event_log::EventLogs;
use peers::Peers;
use stash_info::StashInfo;
use listen_addresses::ListenAddresses;
use nominators::NominatorsByValidator;
use history::History;
use withdrawals::Withdrawals;
use bond_popup::BondPopup;
use payout_popup::PayoutPopup;
use rotate_popup::RotatePopup;

#[derive(Debug, Copy, Clone, PartialEq)]
pub enum CurrentTab {
    Nothing,
    StashInfo,
    ListenAddresses,
    NominatorsByValidator,
    History,
    Withdrawals,
    Peers,
    EventLogs,
    BondPopup,
    PayoutPopup,
    RotatePopup,
}

pub trait PartialComponent: Component {
    fn set_active(&mut self, current_tab: CurrentTab);
}

pub struct Validator {
    is_active: bool,
    current_tab: CurrentTab,
    previous_tab: CurrentTab,
    components: Vec<Box<dyn PartialComponent>>,
}

impl Default for Validator {
    fn default() -> Self {
        Self {
            is_active: false,
            current_tab: CurrentTab::Nothing,
            previous_tab: CurrentTab::Nothing,
            components: vec![
                Box::new(StashInfo::default()),
                Box::new(NominatorsByValidator::default()),
                Box::new(StashDetails::default()),
                Box::new(StakingDetails::default()),
                Box::new(RewardDetails::default()),
                Box::new(History::default()),
                Box::new(Withdrawals::default()),
                Box::new(Peers::default()),
                Box::new(ListenAddresses::default()),
                Box::new(EventLogs::default()),
                Box::new(BondPopup::default()),
                Box::new(PayoutPopup::default()),
                Box::new(RotatePopup::default()),
            ],
        }
    }
}

impl Validator {
    fn move_left(&mut self) {
        match self.current_tab {
            CurrentTab::EventLogs => self.current_tab = CurrentTab::Peers,
            CurrentTab::Peers => self.current_tab = CurrentTab::Withdrawals,
            CurrentTab::Withdrawals => self.current_tab = CurrentTab::History,
            CurrentTab::History => self.current_tab = CurrentTab::NominatorsByValidator,
            CurrentTab::NominatorsByValidator => self.current_tab = CurrentTab::ListenAddresses,
            CurrentTab::ListenAddresses => self.current_tab = CurrentTab::StashInfo,
            _ => {}
        }
    }

    fn move_right(&mut self) {
        match self.current_tab {
            CurrentTab::Nothing => self.current_tab = CurrentTab::StashInfo,
            CurrentTab::StashInfo => self.current_tab = CurrentTab::ListenAddresses,
            CurrentTab::ListenAddresses => self.current_tab = CurrentTab::NominatorsByValidator,
            CurrentTab::NominatorsByValidator => self.current_tab = CurrentTab::History,
            CurrentTab::History => self.current_tab = CurrentTab::Withdrawals,
            CurrentTab::Withdrawals => self.current_tab = CurrentTab::Peers,
            CurrentTab::Peers => self.current_tab = CurrentTab::EventLogs,
            _ => {}
        }
    }
}

impl Component for Validator {
    fn register_network_handler(&mut self, tx: Sender<Action>) -> Result<()> {
        for component in self.components.iter_mut() {
            component.register_network_handler(tx.clone())?;
        }
        Ok(())
    }

    fn register_action_handler(&mut self, tx: UnboundedSender<Action>) -> Result<()> {
        for component in self.components.iter_mut() {
            component.register_action_handler(tx.clone())?;
        }
        Ok(())
    }

    fn register_config_handler(&mut self, config: Config) -> Result<()> {
        for component in self.components.iter_mut() {
            component.register_config_handler(config.clone())?;
        }
        Ok(())
    }

    fn handle_key_event(&mut self, key: KeyEvent) -> Result<Option<Action>> {
        if !self.is_active { return Ok(None) }

        match self.current_tab {
            CurrentTab::BondPopup | 
                CurrentTab::RotatePopup |
                CurrentTab::PayoutPopup => match key.code {
                KeyCode::Esc => {
                    self.current_tab = self.previous_tab;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                _ => {
                    for component in self.components.iter_mut() {
                        component.handle_key_event(key)?;
                    }
                }
            },
            _ => match key.code {
                KeyCode::Esc => {
                    self.is_active = false;
                    self.current_tab = CurrentTab::Nothing;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                    return Ok(Some(Action::SetActiveScreen(Mode::Menu)));
                },
                KeyCode::Char('l') | KeyCode::Right => {
                    self.move_right();
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                KeyCode::Char('h') | KeyCode::Left => {
                    self.move_left();
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                KeyCode::Char('R') => {
                    self.previous_tab = self.current_tab;
                    self.current_tab = CurrentTab::RotatePopup;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                KeyCode::Char('B') => {
                    self.previous_tab = self.current_tab;
                    self.current_tab = CurrentTab::BondPopup;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                _ => {
                    for component in self.components.iter_mut() {
                        component.handle_key_event(key)?;
                    }
                }
            }
        }
        Ok(None)
    }

    fn update(&mut self, action: Action) -> Result<Option<Action>> {
        match action {
            Action::SetActiveScreen(Mode::Validator) => {
                self.is_active = true;
                self.current_tab = CurrentTab::StashInfo;
            }
            Action::PayoutValidatorPopup(_, _) => {
                self.previous_tab = self.current_tab;
                self.current_tab = CurrentTab::PayoutPopup;
            }
            Action::ClosePopup => {
                self.current_tab = self.previous_tab;
            },
            _ => {},
        }
        for component in self.components.iter_mut() {
            component.set_active(self.current_tab.clone());
            component.update(action.clone())?;
        }
        Ok(None)
    }

    fn draw(&mut self, frame: &mut Frame, area: Rect) -> Result<()> {
        let screen = super::screen_layout(area);
        for component in self.components.iter_mut() {
            component.draw(frame, screen)?;
        }
        Ok(())
    }
}

pub fn validator_layout(area: Rect) -> [Rect; 4] {
    Layout::vertical([
        Constraint::Length(16),
        Constraint::Fill(1),
        Constraint::Fill(1),
        Constraint::Percentage(25),
    ]).areas(area)
}

pub fn validator_details_layout(area: Rect) -> [Rect; 2] {
    let [place, _, _, _] = validator_layout(area);
    Layout::horizontal([
        Constraint::Length(31),
        Constraint::Fill(1),
    ]).areas(place)
}

pub fn validator_session_and_listen_layout(area: Rect) -> [Rect; 2] {
    let [_, place] = validator_details_layout(area);
    Layout::vertical([
        Constraint::Length(6),
        Constraint::Fill(1),
    ]).areas(place)
}

pub fn validator_statistics_layout(area: Rect) -> [Rect; 3] {
    let [_, place, _, _] = validator_layout(area);
    Layout::horizontal([
        Constraint::Percentage(30),
        Constraint::Percentage(40),
        Constraint::Percentage(30),
    ]).areas(place)
}

pub fn validator_balance_layout(area: Rect) -> [Rect; 3] {
    let [place, _] = validator_details_layout(area);
    Layout::vertical([
        Constraint::Length(6),
        Constraint::Length(5),
        Constraint::Length(5),
    ]).areas(place)
}