tabiew 0.13.1

A lightweight TUI application to view and query tabular data files, such as CSV, TSV, and parquet.
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use anyhow::anyhow;
use crossterm::event::{KeyCode, KeyModifiers};
use itertools::Itertools;
use ratatui::{
    layout::{Alignment, Constraint, Margin},
    symbols::Marker,
    text::Span,
    widgets::{Axis, Chart, Clear, Dataset, GraphType, LegendPosition, Padding, Widget},
};

use crate::{
    AppResult,
    handler::message::Message,
    misc::{config::theme, ragged_vec::RaggedVec},
    tui::{component::Component, widgets::block::Block},
};

#[derive(Debug)]
pub struct ScatterPlot {
    data: RaggedVec<(f64, f64)>,
    x_bounds: [f64; 2],
    y_bounds: [f64; 2],
    x_label: String,
    y_label: String,
    groups: Option<Vec<String>>,
}

impl ScatterPlot {
    pub fn new(x_label: String, y_label: String, data: RaggedVec<(f64, f64)>) -> AppResult<Self> {
        let [x_bounds, y_bounds] = data
            .iter()
            .flat_map(|v| v.iter())
            .fold(None, |bounds, p| {
                let bounds = bounds.unwrap_or([[p.0, p.0], [p.1, p.1]]);
                Some([
                    [bounds[0][0].min(p.0), bounds[0][1].max(p.0)],
                    [bounds[1][0].min(p.1), bounds[1][1].max(p.1)],
                ])
            })
            .ok_or(anyhow!("Empty dimension"))?;
        Ok(Self {
            data,
            x_bounds,
            y_bounds,
            x_label,
            y_label,
            groups: None,
        })
    }

    pub fn with_groups(self, groups: impl Into<Option<Vec<String>>>) -> Self {
        Self {
            groups: groups.into(),
            ..self
        }
    }
}

impl Component for ScatterPlot {
    fn render(
        &mut self,
        _area: ratatui::prelude::Rect,
        buf: &mut ratatui::prelude::Buffer,
        _focus_state: crate::tui::component::FocusState,
    ) {
        let area = buf.area.inner(Margin::new(7, 3));
        Widget::render(Clear, area, buf);
        let ds = self
            .data
            .iter()
            .enumerate()
            .map(|(i, v)| {
                let ds = Dataset::default()
                    .marker(Marker::Dot)
                    .graph_type(GraphType::Scatter)
                    .style(theme().graph(i))
                    .data(v);
                if let Some(g) = &self.groups {
                    ds.name(g[i].as_str())
                } else {
                    ds
                }
            })
            .collect_vec();

        let chart = Chart::new(ds)
            .x_axis(
                Axis::default()
                    .title(Span::styled(&self.x_label, theme().text()))
                    .bounds(self.x_bounds)
                    .style(theme().text())
                    .labels(
                        self.x_bounds
                            .map(|f| Span::styled(format!("{f:.2}"), theme().text())),
                    ),
            )
            .y_axis(
                Axis::default()
                    .title(Span::styled(&self.y_label, theme().text()))
                    .bounds(self.y_bounds)
                    .style(theme().text())
                    .labels(
                        self.y_bounds
                            .map(|f| Span::styled(format!("{f:.2}"), theme().text())),
                    ),
            )
            .style(theme().text())
            .block(
                Block::default()
                    .title("Scatter Plot")
                    .title_alignment(Alignment::Center)
                    .padding(Padding::new(1, 2, 0, 0))
                    .into_widget(),
            )
            .legend_position(Some(LegendPosition::TopRight))
            .hidden_legend_constraints((Constraint::Min(0), Constraint::Min(0)));

        chart.render(area, buf);
    }

    fn handle(&mut self, event: crossterm::event::KeyEvent) -> bool {
        match (event.code, event.modifiers) {
            (KeyCode::Char('q'), KeyModifiers::NONE) => {
                Message::PaneDismissModal.enqueue();
                true
            }
            (KeyCode::Enter, KeyModifiers::NONE) => true,
            _ => false,
        }
    }
}