use regex::Regex;
use std::path::PathBuf;
use std::{env, fs};

fn main() {
    glib_build_tools::compile_resources(
        &["resources"],
        "resources/resources.gresource.xml",
        "templates.gresource",
    );

    let colors_path = "style/_colors.scss";

    println!("cargo:rerun-if-changed={colors_path}");

    let scss = fs::read_to_string(colors_path).expect("Failed to read SCSS colors");

    let regex =
        Regex::new(r"(?m)^\s*\$([a-zA-Z_][a-zA-Z0-9_-]*)\s*:\s*(#[0-9a-fA-F]{3,8})\s*;").unwrap();

    let mut generated = String::from("// Generated by build.rs. Do not edit\n\n");

    for captures in regex.captures_iter(&scss) {
        let name = captures.get(1).unwrap().as_str();
        let value = captures.get(2).unwrap().as_str();

        let constant_name = name.replace('-', "_").to_uppercase();

        generated.push_str(&format!("pub const {constant_name}: &str = \"{value}\";\n"));
    }

    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());

    fs::write(out_dir.join("theme.rs"), generated).expect("Failed to generate theme.rs");
}