kitmd 0.2.1

A terminal-based markdown and mermaid renderer/viewer using the Kitty graphics protocol
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use std::collections::BTreeMap;

use crate::mermaid_engine::config::LayoutConfig;
use crate::mermaid_engine::ir::Graph;
use crate::mermaid_engine::theme::Theme;

use super::text::measure_label;
use super::{DiagramData, Layout, QuadrantLayout, QuadrantPointLayout, TextBlock};

fn quadrant_palette(_theme: &Theme) -> Vec<String> {
    vec![
        "#6366f1".to_string(), // indigo
        "#f59e0b".to_string(), // amber
        "#10b981".to_string(), // emerald
        "#ef4444".to_string(), // red
        "#8b5cf6".to_string(), // violet
        "#06b6d4".to_string(), // cyan
    ]
}

fn finite_unit_interval(value: f32) -> f32 {
    if value.is_finite() {
        value.clamp(0.0, 1.0)
    } else {
        0.0
    }
}

pub(super) fn compute_quadrant_layout(
    graph: &Graph,
    theme: &Theme,
    config: &LayoutConfig,
) -> Layout {
    let padding = theme.font_size * 1.6;
    let grid_size = 360.0;
    // Measure title
    let title = graph
        .quadrant
        .title
        .as_ref()
        .map(|t| measure_label(t, theme, config));
    let title_height = title.as_ref().map(|t| t.height + padding).unwrap_or(0.0);

    // Measure axis labels
    let x_left = graph
        .quadrant
        .x_axis_left
        .as_ref()
        .map(|t| measure_label(t, theme, config));
    let x_right = graph
        .quadrant
        .x_axis_right
        .as_ref()
        .map(|t| measure_label(t, theme, config));
    let y_bottom = graph
        .quadrant
        .y_axis_bottom
        .as_ref()
        .map(|t| measure_label(t, theme, config));
    let y_top = graph
        .quadrant
        .y_axis_top
        .as_ref()
        .map(|t| measure_label(t, theme, config));

    // Measure quadrant labels
    let q_labels: [Option<TextBlock>; 4] = [
        graph.quadrant.quadrant_labels[0]
            .as_ref()
            .map(|t| measure_label(t, theme, config)),
        graph.quadrant.quadrant_labels[1]
            .as_ref()
            .map(|t| measure_label(t, theme, config)),
        graph.quadrant.quadrant_labels[2]
            .as_ref()
            .map(|t| measure_label(t, theme, config)),
        graph.quadrant.quadrant_labels[3]
            .as_ref()
            .map(|t| measure_label(t, theme, config)),
    ];

    let y_axis_label_width = y_bottom
        .as_ref()
        .map(|t| t.width)
        .unwrap_or(0.0)
        .max(y_top.as_ref().map(|t| t.width).unwrap_or(0.0));
    let y_axis_width = if y_axis_label_width > 0.0 {
        y_axis_label_width + padding
    } else {
        padding
    };
    let x_axis_height = x_left
        .as_ref()
        .map(|t| t.height + padding)
        .unwrap_or(padding);

    let grid_x = y_axis_width + padding;
    let grid_y = title_height + padding;

    // Layout points
    let palette = quadrant_palette(theme);
    let points: Vec<QuadrantPointLayout> = graph
        .quadrant
        .points
        .iter()
        .enumerate()
        .map(|(i, p)| {
            let x = finite_unit_interval(p.x);
            let y = finite_unit_interval(p.y);
            let px = grid_x + x * grid_size;
            let py = grid_y + (1.0 - y) * grid_size; // Invert Y
            QuadrantPointLayout {
                label: measure_label(&p.label, theme, config),
                x: px,
                y: py,
                color: palette[i % palette.len()].clone(),
            }
        })
        .collect();

    let width = grid_x + grid_size + padding * 2.0;
    let height = grid_y + grid_size + x_axis_height + padding;

    Layout {
        kind: graph.kind,
        nodes: BTreeMap::new(),
        edges: Vec::new(),
        subgraphs: Vec::new(),
        width,
        height,
        diagram: DiagramData::Quadrant(QuadrantLayout {
            title,
            title_y: title_height / 2.0,
            x_axis_left: x_left,
            x_axis_right: x_right,
            y_axis_bottom: y_bottom,
            y_axis_top: y_top,
            quadrant_labels: q_labels,
            points,
            grid_x,
            grid_y,
            grid_width: grid_size,
            grid_height: grid_size,
        }),
    }
}