//! Font registration for the plotters backends.

//!

//! The charts are drawn by binaries that ship as *static musl* executables in a

//! `FROM scratch` image, where fontconfig cannot be reached at all: a static

//! binary has no dynamic loader, so plotters' `ttf` backend panicked inside

//! `yeslogic-fontconfig-sys` ("Dynamic loading not supported") before it could

//! even look for a face. That panic escaped [`crate::svg::render_svg`]'s

//! fallback, which only catches `Err`.

//!

//! So the face is compiled in and registered with plotters' pure-Rust

//! `ab_glyph` backend instead. No host fonts, no fontconfig, no `dlopen`.

use std::sync::OnceLock;

use plotters::style::{FontStyle, register_font};

/// The family name every chart asks for (see `draw.rs`).

const FAMILY: &str = "sans-serif";

/// DejaVu Sans covers Latin, Greek, Cyrillic and common symbols — not CJK. Chart

/// labels are user text (account, category and tag names), so a label outside

/// that coverage rasterises as missing-glyph boxes in the native PNG/kitty

/// output. The browser still falls back for SVG, since it shapes the `<text>`

/// nodes itself. Vendoring a CJK face would add tens of megabytes to every

/// binary; revisit if such labels are actually in use.

static DEJAVU_SANS: &[u8] = include_bytes!("../fonts/DejaVuSans.ttf");

static REGISTERED: OnceLock<bool> = OnceLock::new();

/// Register the embedded face, once per process. Returns whether every style

/// was accepted; a `false` here means text drawing will fail and callers fall

/// back to their degraded rendering.

///

/// Every style maps to the same regular face: only the regular one is vendored,

/// and a missing style is a drawing error rather than a heavier stroke, so bold

/// text renders as regular by design.

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

            "embedded font rejected by plotters — charts would degrade to title-only"

        );

    #[test]

}