use color_eyre::Result;
use crossterm::event::{KeyCode, KeyEvent};
use ratatui::{layout::Rect, Frame};
use tokio::sync::mpsc::UnboundedSender;

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

pub mod layouts;
mod latest_block;
mod finalized_block;
mod block_ticker;
mod current_era;
mod current_epoch;
mod extrinsics_chart;
mod block_explorer;
mod extrinsic_explorer;
mod log_explorer;

use latest_block::LatestBlock;
use finalized_block::FinalizedBlock;
use block_ticker::BlockTicker;
use current_era::CurrentEra;
use current_epoch::CurrentEpoch;
use extrinsics_chart::ExtrinsicsChart;
use block_explorer::BlockExplorer;
use extrinsic_explorer::ExtrinsicExplorer;
use log_explorer::LogExplorer;

#[derive(Debug, Clone, Copy, PartialEq)]
pub enum CurrentTab {
    Nothing,
    Blocks,
    Extrinsics,
}

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

impl Default for Explorer {
    fn default() -> Self {
        Self {
            is_active: false,
            current_tab: CurrentTab::Nothing,
            components: vec![
                Box::new(BlockTicker::default()),
                Box::new(LatestBlock::default()),
                Box::new(FinalizedBlock::default()),
                Box::new(CurrentEra::default()),
                Box::new(CurrentEpoch::default()),
                Box::new(ExtrinsicsChart::default()),
                Box::new(BlockExplorer::default()),
                Box::new(ExtrinsicExplorer::default()),
                Box::new(LogExplorer::default()),
            ]
        }
    }
}

impl Explorer {
    fn move_left(&mut self) {
        if let CurrentTab::Extrinsics = self.current_tab {
            self.current_tab = CurrentTab::Blocks;
        }
    }

    fn move_right(&mut self) {
        match self.current_tab {
            CurrentTab::Nothing => self.current_tab = CurrentTab::Blocks,
            CurrentTab::Blocks => self.current_tab = CurrentTab::Extrinsics,
            _ => {}
        }
    }
}

impl Activatable for Explorer {
    fn is_active(&self) -> bool { self.is_active }
    fn is_inactive(&self) -> bool { !self.is_active }
    fn set_inactive(&mut self) { self.is_active = false; }
    fn set_active(&mut self) { self.is_active = true; }
}

impl PartialComponent<CurrentTab> for Explorer {}

impl Component for Explorer {
    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<()> {
        if let Some(_) = config.styles.get(&crate::app::Mode::Explorer) {
            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_inactive() { return Ok(None); }

        match key.code {
            KeyCode::Esc => {
                self.set_inactive();
                self.current_tab = CurrentTab::Nothing;
                for component in self.components.iter_mut() {
                    component.set_active_tab(self.current_tab);
                }
                return Ok(Some(Action::SetActiveScreen(Mode::Menu)));
            },
            KeyCode::Enter | KeyCode::Char('l') | KeyCode::Right => {
                self.move_right();
                for component in self.components.iter_mut() {
                    component.set_active_tab(self.current_tab);
                }
            },
            KeyCode::Char('h') | KeyCode::Left => {
                self.move_left();
                for component in self.components.iter_mut() {
                    component.set_active_tab(self.current_tab);
                }
            },
            _ => {
                for component in self.components.iter_mut() {
                    let maybe_action = component.handle_key_event(key);
                    if let Ok(Some(_)) = maybe_action {
                        return maybe_action;
                    }
                }
            },
        }
        Ok(None)
    }

    fn update(&mut self, action: Action) -> Result<Option<Action>> {
        if let Action::SetActiveScreen(Mode::Explorer) = action {
            self.set_active();
            self.current_tab = CurrentTab::Blocks;
            for component in self.components.iter_mut() {
                component.set_active_tab(self.current_tab);
            }
        }
        for component in self.components.iter_mut() {
            component.update(action.clone())?;
        }
        Ok(None)
    }

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