// Copyright (C) 2026 Elias Wendland <eliaswendland@pm.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3 exclusively.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::{path::Path, process::Command};

fn latest_engine_version(workspace: &Path) -> String {
    if let Ok(version) = std::env::var("CONVERTIS_ENGINE_VERSION") {
        return version;
    }
    Command::new("git")
        .args(["describe", "--tags", "--abbrev=0", "--match", "v[0-9]*"])
        .current_dir(workspace)
        .output()
        .ok()
        .filter(|output| output.status.success())
        .map(|output| String::from_utf8_lossy(&output.stdout).trim().to_owned())
        .filter(|version| !version.is_empty())
        .map(|version| version.strip_prefix('v').unwrap_or(&version).to_owned())
        .unwrap_or_else(|| "unknown".to_owned())
}

fn main() {
    let manifest = std::env::var_os("CARGO_MANIFEST_DIR").expect("Cargo provides manifest dir");
    let workspace = Path::new(&manifest).join("../..");
    let target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_owned());
    let engine_version = latest_engine_version(&workspace);
    println!("cargo:rerun-if-env-changed=CONVERTIS_ENGINE_VERSION");
    println!(
        "cargo:rerun-if-changed={}",
        workspace.join(".git/HEAD").display()
    );
    println!("cargo:rustc-env=CONVERTIS_ENGINE_VERSION={engine_version}");
    println!("cargo:rustc-env=CONVERTIS_TARGET={target}");
}