use crate::i18n::t;
use crate::ui::dashboard::model::DashboardViewState;
use crate::ui::dashboard::{MonitorStatus, MonitorViewState};
use ratatui::{
    Frame,
    layout::{Constraint, Direction, Layout, Rect},
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, List, ListItem, ListState},
};

const STATUS_LINE_LENGTH: usize = 20;
const MAX_NAME_LENGTH: usize = 30;

pub fn render_monitor_list(
    frame: &mut Frame,
    area: Rect,
    state: &DashboardViewState,
    list_state: &mut ListState,
) {
    let block = Block::default()
        .title(t("monitors"))
        .borders(Borders::ALL)
        .style(Style::default().fg(Color::Blue));

    let items: Vec<ListItem> = state
        .monitors
        .iter()
        .map(|monitor| create_monitor_item(monitor))
        .collect();

    let list = List::new(items)
        .block(block)
        .highlight_style(Style::default().add_modifier(Modifier::REVERSED))
        .highlight_symbol(">> ");

    frame.render_stateful_widget(list, area, list_state);
}

fn create_status_line_spans(status_history: &[MonitorStatus]) -> Vec<Span<'static>> {
    let mut spans = Vec::new();
    let recent_status: Vec<_> = status_history
        .iter()
        .rev()
        .take(STATUS_LINE_LENGTH)
        .collect();

    for status in recent_status.iter().rev() {
        let c = get_status_char(status);
        let color = get_status_color(status);

        spans.push(Span::styled(c.to_string(), Style::default().fg(color)));
    }

    spans.push(Span::raw(" "));
    spans.push(Span::styled(
        t("now"),
        Style::default()
            .fg(Color::Gray)
            .add_modifier(Modifier::ITALIC),
    ));

    spans
}

pub fn get_status_char(status: &MonitorStatus) -> char {
    match status {
        MonitorStatus::Up => '█',
        MonitorStatus::Down => '█',
        MonitorStatus::Unknown => '░',
    }
}

pub fn get_status_color(status: &MonitorStatus) -> Color {
    match status {
        MonitorStatus::Up => Color::Green,
        MonitorStatus::Down => Color::Red,
        MonitorStatus::Unknown => Color::Yellow,
    }
}

pub fn get_status_emoji(status: &MonitorStatus) -> &str {
    match status {
        MonitorStatus::Up => "✅",
        MonitorStatus::Down => "❌",
        MonitorStatus::Unknown => "❓",
    }
}

fn create_monitor_item(monitor: &MonitorViewState) -> ListItem {
    let status_icon = get_status_emoji(&monitor.status);
    let status_color = get_status_color(&monitor.status);
    let status_line = create_status_line_spans(&monitor.status_history);

    let item_layout = Layout::default()
        .direction(Direction::Horizontal)
        .constraints([
            Constraint::Length(3),
            Constraint::Length(MAX_NAME_LENGTH as u16),
            Constraint::Length(10),
            Constraint::Length(10),
            Constraint::Length(STATUS_LINE_LENGTH as u16),
        ])
        .split(Rect {
            x: 0,
            y: 0,
            width: 1000,
            height: 1,
        });

    let status_span = Span::styled(
        format!("{} ", status_icon),
        Style::default()
            .fg(status_color)
            .add_modifier(Modifier::BOLD),
    );

    let mut name_text = monitor.name.clone();
    if name_text.len() > MAX_NAME_LENGTH {
        name_text = format!("{}...", &name_text[..MAX_NAME_LENGTH - 3]);
    }

    let name_span = Span::styled(
        name_text,
        Style::default()
            .fg(Color::White)
            .add_modifier(Modifier::BOLD),
    );

    let response_span = Span::styled(
        format!("{:>7}ms", monitor.response_time),
        Style::default().fg(Color::Cyan),
    );

    let uptime_span = Span::styled(
        format!("{:>7}%", monitor.uptime_24h),
        Style::default().fg(Color::Magenta),
    );

    let status_spans = create_status_line_spans(&monitor.status_history);
    let status_line_start_period = Span::styled(
        "(1h)",
        Style::default()
            .fg(Color::Gray)
            .add_modifier(Modifier::ITALIC),
    );
    let status_line_end_period = Span::styled(
        t("now"),
        Style::default()
            .fg(Color::Gray)
            .add_modifier(Modifier::ITALIC),
    );
    let mut lines = Vec::new();
    let main_line = Line::from(vec![
        status_span,
        name_span,
        Span::raw(" | "),
        response_span,
        Span::raw(" | "),
        uptime_span,
        Span::raw(" | "),
        status_line_start_period,
    ]);
    lines.push(main_line);

    let status_line = Line::from(status_spans);
    lines.push(status_line);
    ListItem::new(lines)
}