#![allow(dead_code)]

use std::time::Instant;

use ratatui::{
    Frame,
    layout::Rect,
    style::Style,
    text::{Line, Span},
    widgets::{Block, Borders, Clear, Paragraph},
};

use crate::application::notification_state::{
    MAX_VISIBLE, Notification, NotificationManager, format_elapsed,
};
use crate::theme;

impl NotificationManager {
    pub fn render(&self, frame: &mut Frame, area: Rect) {
        let visible: Vec<&Notification> = self
            .active()
            .iter()
            .rev()
            .take(MAX_VISIBLE)
            .collect::<Vec<_>>()
            .into_iter()
            .rev()
            .collect();

        if visible.is_empty() {
            return;
        }

        let notif_width = 50u16.min(area.width.saturating_sub(4));
        let notif_height = 3u16;
        let spacing = 1u16;
        let total_height = visible.len() as u16 * (notif_height + spacing);

        let start_y = area.y + area.height.saturating_sub(total_height + 1);
        let start_x = area.x + area.width.saturating_sub(notif_width + 2);

        for (i, notif) in visible.iter().enumerate() {
            let y = start_y + (i as u16) * (notif_height + spacing);
            let notif_area = Rect::new(start_x, y, notif_width, notif_height);

            frame.render_widget(Clear, notif_area);

            let border_color = notif.kind.color();
            let block = Block::default()
                .borders(Borders::LEFT)
                .border_style(Style::default().fg(border_color))
                .style(Style::default().bg(theme::BG1));

            let inner = block.inner(notif_area);
            frame.render_widget(block, notif_area);

            let elapsed = Instant::now().duration_since(notif.created_at).as_secs();
            let timestamp = if elapsed == 0 {
                "now".to_string()
            } else {
                format!("{}s", elapsed)
            };

            let mut lines = vec![Line::from(vec![
                Span::styled(&notif.icon, Style::default().fg(border_color)),
                Span::raw(" "),
                Span::styled(
                    &notif.title,
                    Style::default()
                        .fg(theme::FG1)
                        .add_modifier(ratatui::style::Modifier::BOLD),
                ),
                Span::raw(" "),
                Span::styled(timestamp, Style::default().fg(theme::GRAY)),
            ])];

            if let Some(detail) = &notif.detail {
                let max_len = inner.width.saturating_sub(2) as usize;
                let d = if detail.len() > max_len {
                    format!("{}…", &detail[..max_len.saturating_sub(1)])
                } else {
                    detail.clone()
                };
                lines.push(Line::from(Span::styled(
                    d,
                    Style::default().fg(theme::GRAY),
                )));
            }

            let para = Paragraph::new(lines);
            frame.render_widget(para, inner);
        }
    }
}

pub fn render_notification_item(frame: &mut Frame, area: Rect, notif: &Notification) {
    let border_color = notif.kind.color();
    let block = Block::default()
        .borders(Borders::LEFT)
        .border_style(Style::default().fg(border_color))
        .style(Style::default().bg(theme::BG1));

    let inner = block.inner(area);
    frame.render_widget(block, area);

    let elapsed = Instant::now().duration_since(notif.created_at).as_secs();
    let timestamp = format_elapsed(elapsed);

    let mut lines = vec![Line::from(vec![
        Span::styled(&notif.icon, Style::default().fg(border_color)),
        Span::raw(" "),
        Span::styled(
            notif.kind.label(),
            Style::default()
                .fg(theme::FG1)
                .add_modifier(ratatui::style::Modifier::BOLD),
        ),
        Span::raw(" "),
        Span::styled(timestamp, Style::default().fg(theme::GRAY)),
    ])];

    if let Some(detail) = &notif.detail {
        let max_len = inner.width.saturating_sub(2) as usize;
        let d = if detail.len() > max_len {
            format!("{}…", &detail[..max_len.saturating_sub(1)])
        } else {
            detail.clone()
        };
        lines.push(Line::from(Span::styled(
            d,
            Style::default().fg(theme::GRAY),
        )));
    } else {
        let max_len = inner.width.saturating_sub(2) as usize;
        let title = if notif.title.len() > max_len {
            format!("{}…", &notif.title[..max_len.saturating_sub(1)])
        } else {
            notif.title.clone()
        };
        lines.push(Line::from(Span::styled(
            title,
            Style::default().fg(theme::GRAY),
        )));
    }

    let para = Paragraph::new(lines);
    frame.render_widget(para, inner);
}