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

mod balance;
mod transfer;
mod address_book;
mod add_account;
mod rename_account;
mod event_logs;
mod accounts;
mod overview;
mod add_address_book_record;
mod rename_address_book_record;

use balance::Balance;
use tokio::sync::mpsc::UnboundedSender;
use transfer::Transfer;
use address_book::AddressBook;
use add_account::AddAccount;
use rename_account::RenameAccount;
use event_logs::EventLogs;
use accounts::Accounts;
use overview::Overview;
use add_address_book_record::AddAddressBookRecord;
use rename_address_book_record::RenameAddressBookRecord;

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

#[derive(Debug, Clone, PartialEq)]
pub enum CurrentTab {
    Nothing,
    Accounts,
    AddressBook,
    EventLogs,
    AddAccount,
    AddAddressBookRecord,
    RenameAccount,
    RenameAddressBookRecord,
}

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

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

impl Default for Wallet {
    fn default() -> Self {
        Self {
            is_active: false,
            current_tab: CurrentTab::Accounts,
            components: vec![
                Box::new(Overview::default()),
                Box::new(Accounts::default()),
                Box::new(Balance::default()),
                Box::new(AddressBook::default()),
                Box::new(EventLogs::default()),
                Box::new(Transfer::default()),
                Box::new(AddAccount::default()),
                Box::new(RenameAccount::default()),
                Box::new(AddAddressBookRecord::default()),
                Box::new(RenameAddressBookRecord::default()),
            ],
        }
    }
}

impl Wallet {
    fn move_left(&mut self) {
        match self.current_tab {
            CurrentTab::EventLogs => self.current_tab = CurrentTab::AddressBook,
            CurrentTab::AddressBook => self.current_tab = CurrentTab::Accounts,
            _ => {}
        }
    }

    fn move_right(&mut self) {
        match self.current_tab {
            CurrentTab::Nothing => self.current_tab = CurrentTab::Accounts,
            CurrentTab::Accounts => self.current_tab = CurrentTab::AddressBook,
            CurrentTab::AddressBook => self.current_tab = CurrentTab::EventLogs,
            _ => {}
        }
    }
}

impl Component for Wallet {
    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 {
            // block the default key handle for popups
            CurrentTab::AddAccount | 
                CurrentTab::RenameAccount | 
                CurrentTab::RenameAddressBookRecord | 
                CurrentTab::AddAddressBookRecord => match key.code {
                    KeyCode::Esc => {
                        self.current_tab = CurrentTab::Accounts;
                        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('W') => {
                    self.current_tab = CurrentTab::AddAccount;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                KeyCode::Char('A') => {
                    self.current_tab = CurrentTab::AddAddressBookRecord;
                    for component in self.components.iter_mut() {
                        component.set_active(self.current_tab.clone());
                    }
                },
                KeyCode::Enter | 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());
                    }
                },
                _ => {
                    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::Wallet) => self.is_active = true,
            Action::UpdateAccountName(_) | Action::NewAccount(_) => 
                self.current_tab = CurrentTab::Accounts,
            Action::UpdateAddressBookRecord(_) | Action::NewAddressBookRecord(_, _) => 
                self.current_tab = CurrentTab::AddressBook,
            Action::RenameAccount(_) => self.current_tab = CurrentTab::RenameAccount,
            Action::RenameAddressBookRecord(_) => 
                self.current_tab = CurrentTab::RenameAddressBookRecord,
            _ => {}
        }
        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 wallet_layout(area: Rect) -> [Rect; 2] {
    Layout::vertical([
        Constraint::Percentage(75),
        Constraint::Percentage(25),
    ]).areas(area)
}

pub fn bars_layout(area: Rect) -> [Rect; 2] {
    let [place, _] = wallet_layout(area);
    Layout::horizontal([
        Constraint::Percentage(50),
        Constraint::Percentage(50),
    ]).areas(place)
}

pub fn account_layout(area: Rect) -> [Rect; 3] {
    let [place, _] = bars_layout(area);
    Layout::vertical([
        Constraint::Max(4),
        Constraint::Min(0),
        Constraint::Max(6),
    ]).areas(place)
}