use color_eyre::Result;
use ratatui::{
    text::Text,
    layout::{Alignment, Constraint, Rect}, 
    widgets::{Block, Cell, Row, Table}, 
    Frame
};

use super::{Component, PartialComponent, CurrentTab};
use crate::{
    widgets::DotSpinner,
    action::Action, 
    config::Config, 
    palette::StylePalette, 
};

#[derive(Debug)]
pub struct Balance {
    is_active: bool,
    total_balance: Option<u128>,
    transferable_balance: Option<u128>,
    locked_balance: Option<u128>,
    reserved_balance: Option<u128>,
    nonce: Option<u32>,
    palette: StylePalette
}

impl Default for Balance {
    fn default() -> Self {
        Self::new()
    }
}

impl Balance {
    const TICKER: &str = " CSPR";
    const DECIMALS: usize = 6;

    pub fn new() -> Self {
        Self {
            is_active: false,
            total_balance: None,
            transferable_balance: None,
            locked_balance: None,
            reserved_balance: None,
            nonce: None,
            palette: StylePalette::default(),
        }
    }

    fn prepare_u128(&self, maybe_value: Option<u128>) -> String {
        match maybe_value {
            Some(value) => {
                let value = value as f64 / 10f64.powi(18);
                let after = Self::DECIMALS;
                format!("{:.after$}{}", value, Self::TICKER)
            },
            None => format!("{}{}", DotSpinner::default().to_string(), Self::TICKER)
        }
    }
}

impl PartialComponent for Balance {
    fn set_active(&mut self, current_tab: CurrentTab) {
        match current_tab {
            CurrentTab::Accounts => self.is_active = true,
            _ => self.is_active = false,
        }
    }
}

impl Component for Balance {
    fn register_config_handler(&mut self, config: Config) -> Result<()> {
        if let Some(style) = config.styles.get(&crate::app::Mode::Wallet) {
            self.palette.with_normal_style(style.get("normal_style").copied());
            self.palette.with_hover_style(style.get("hover_style").copied());
            self.palette.with_normal_border_style(style.get("normal_border_style").copied());
            self.palette.with_hover_border_style(style.get("hover_border_style").copied());
            self.palette.with_normal_title_style(style.get("normal_title_style").copied());
            self.palette.with_hover_title_style(style.get("hover_title_style").copied());
        }
        Ok(())
    }

    fn update(&mut self, action: Action) -> Result<Option<Action>> {
        match action {
            Action::BalanceSetActive(maybe_balance) => {
                match maybe_balance {
                    Some(balance) => {
                        self.total_balance = Some(balance.free);
                        self.locked_balance = Some(balance.frozen);
                        self.reserved_balance = Some(balance.reserved);
                        self.nonce = Some(balance.nonce);

                        let transferable = balance.free
                            .saturating_sub(balance.reserved)
                            .saturating_sub(balance.frozen);
                        self.transferable_balance = Some(transferable);
                    },
                    None => {
                        self.transferable_balance = None;
                        self.locked_balance = None;
                        self.reserved_balance = None;
                        self.total_balance = None;
                        self.nonce = None;
                    }
                }
            },
            _ => {}
        };
        Ok(None)
    }

    fn draw(&mut self, frame: &mut Frame, area: Rect) -> Result<()> {
        let [_, _, place, _] = super::account_layout(area);
        let (border_style, border_type) = self.palette
            .create_border_style(self.is_active);

        let table = Table::new(
            [
                Row::new(vec![
                    Cell::from(Text::from("nonce: ".to_string()).alignment(Alignment::Left)),
                    Cell::from(Text::from(self.nonce
                            .map(|n| n.to_string())
                            .unwrap_or(DotSpinner::default().to_string())
                    ).alignment(Alignment::Right)),
                ]),
                Row::new(vec![
                    Cell::from(Text::from("account: ".to_string()).alignment(Alignment::Left)),
                    Cell::from(Text::from(self.prepare_u128(self.total_balance)).alignment(Alignment::Right)),
                ]),
                Row::new(vec![
                    Cell::from(Text::from("free: ".to_string()).alignment(Alignment::Left)),
                    Cell::from(Text::from(self.prepare_u128(self.transferable_balance)).alignment(Alignment::Right))
                ]),
                Row::new(vec![
                    Cell::from(Text::from("locked: ".to_string()).alignment(Alignment::Left)),
                    Cell::from(Text::from(self.prepare_u128(self.locked_balance)).alignment(Alignment::Right)),
                ]),
                Row::new(vec![
                    Cell::from(Text::from("reserved: ".to_string()).alignment(Alignment::Left)),
                    Cell::from(Text::from(self.prepare_u128(self.reserved_balance)).alignment(Alignment::Right)),
                ]),
            ],
            [
                Constraint::Max(10),
                Constraint::Min(14),
            ]
        )
        .block(Block::bordered()
            .border_style(border_style)
            .border_type(border_type)
            .title_alignment(Alignment::Right)
            .title_style(self.palette.create_title_style(false))
            .title("Balance"));

        frame.render_widget(table, place);
        Ok(())
    }
}