//! Colours and widget style. A light theme in the spirit of desktop CAD tools; every colour
//! the UI uses comes from [`Tokens`].

use egui::{Color32, Stroke};

#[derive(Clone, Copy, Debug)]
pub struct Tokens {
    pub app_bar: Color32,
    pub toolbar: Color32,
    pub tab_active: Color32,
    pub panel: Color32,
    pub panel_header: Color32,
    pub border: Color32,
    pub text: Color32,
    pub text_dim: Color32,
    pub accent: Color32,
    pub accent_soft: Color32,
    pub sketch_accent: Color32,
    pub error: Color32,
    pub warning: Color32,
    pub icon: Color32,
    pub icon_fill: Color32,
    pub timeline: Color32,
    pub hover: Color32,
}

impl Tokens {
    pub const fn get() -> Tokens {
        Tokens {
            app_bar: Color32::from_rgb(52, 56, 64),
            toolbar: Color32::from_rgb(246, 247, 249),
            tab_active: Color32::from_rgb(255, 255, 255),
            panel: Color32::from_rgb(250, 251, 252),
            panel_header: Color32::from_rgb(236, 238, 242),
            border: Color32::from_rgb(208, 212, 220),
            text: Color32::from_rgb(38, 42, 50),
            text_dim: Color32::from_rgb(110, 116, 128),
            accent: Color32::from_rgb(38, 120, 218),
            accent_soft: Color32::from_rgb(214, 230, 250),
            sketch_accent: Color32::from_rgb(46, 150, 90),
            error: Color32::from_rgb(214, 54, 54),
            warning: Color32::from_rgb(222, 150, 30),
            icon: Color32::from_rgb(70, 78, 92),
            icon_fill: Color32::from_rgb(178, 196, 222),
            timeline: Color32::from_rgb(232, 235, 240),
            hover: Color32::from_rgb(226, 234, 246),
        }
    }
}

pub fn apply(ctx: &egui::Context) {
    let t = Tokens::get();
    let mut v = egui::Visuals::light();
    v.panel_fill = t.panel;
    v.window_fill = t.panel;
    v.extreme_bg_color = Color32::WHITE;
    v.selection.bg_fill = t.accent_soft;
    v.selection.stroke = Stroke::new(1.0, t.accent);
    v.widgets.noninteractive.bg_stroke = Stroke::new(1.0, t.border);
    v.widgets.noninteractive.fg_stroke = Stroke::new(1.0, t.text);
    v.widgets.inactive.fg_stroke = Stroke::new(1.0, t.text);
    v.widgets.hovered.weak_bg_fill = t.hover;
    v.widgets.hovered.bg_fill = t.hover;
    v.window_corner_radius = egui::CornerRadius::same(6);
    ctx.set_visuals(v);
    ctx.global_style_mut(|s| {
        s.spacing.item_spacing = egui::vec2(6.0, 4.0);
        s.spacing.button_padding = egui::vec2(6.0, 3.0);
    });
}