//! Render `branding/agent-configs.svg` → `$OUT_DIR/agent-configs.png`
//! at compile time so the daemon can `include_bytes!` the PNG without
//! checking the raster into git (#424 mara: "generate png on the fly
//! or in build"). The SVG is the source of truth; the PNG is a build
//! artifact.
//!
//! Uses `rsvg-convert` from PATH (librsvg, already available in
//! nixpkgs and added to the naersk derivation's `nativeBuildInputs`
//! in `flake.nix`). For dev builds outside Nix, install librsvg via
//! your system package manager (Debian/Ubuntu: `librsvg2-bin`,
//! macOS: `brew install librsvg`).

use std::env;
use std::path::PathBuf;
use std::process::Command;

const SVG_PATH: &str = "../branding/agent-configs.svg";
const PNG_NAME: &str = "agent-configs.png";
// 300×300 to match the existing branding/hyperhive.png, which the
// Forgejo avatar endpoint accepts without resizing on upload.
const PX: &str = "300";

fn main() {
    // Re-run the build script when either the SVG itself or this
    // script change. We deliberately don't watch every file in
    // `branding/` — only the one PNG we generate.
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed={SVG_PATH}");

    let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR set by cargo"));
    let png_path = out_dir.join(PNG_NAME);

    let status = Command::new("rsvg-convert")
        .args(["--width", PX, "--height", PX, "-o"])
        .arg(&png_path)
        .arg(SVG_PATH)
        .status();

    match status {
        Ok(s) if s.success() => {}
        Ok(s) => panic!("rsvg-convert exited with {s} rendering {SVG_PATH}"),
        Err(e) => panic!(
            "failed to invoke rsvg-convert: {e}\n\
             install librsvg (Debian/Ubuntu: librsvg2-bin, macOS: brew install librsvg, \
             NixOS: pkgs.librsvg). The Nix derivation already pulls it in via \
             flake.nix → naersk-lib.buildPackage.nativeBuildInputs.",
        ),
    }
}