// Copyright 2019-2020 Parity Technologies (UK) Ltd.
// This file is part of Substrate.

// Substrate 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, either version 3 of the License, or
// (at your option) any later version.

// Substrate 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.

use platforms::*;
use std::{borrow::Cow, process::Command};

/// Generate the `cargo:` key output
pub fn generate_cargo_keys() {
	let output = Command::new("git")
		.args(&["rev-parse", "--short", "HEAD"])
		.output();

	let commit = match output {
		Ok(o) if o.status.success() => {
			let sha = String::from_utf8_lossy(&o.stdout).trim().to_owned();
			Cow::from(sha)
		}
		Ok(o) => {
			println!("cargo:warning=Git command failed with status: {}", o.status);
			Cow::from("unknown-commit")
		},
		Err(err) => {
			println!("cargo:warning=Failed to execute git command: {}", err);
			Cow::from("unknown-commit")
		},
	};

	println!("cargo:rustc-env=SUBSTRATE_CLI_IMPL_VERSION={}", get_version(&commit))
}

fn get_platform() -> String {
	let env_dash = if TARGET_ENV.is_some() { "-" } else { "" };

	format!(
		"{}-{}{}{}",
		TARGET_ARCH.as_str(),
		TARGET_OS.as_str(),
		env_dash,
		TARGET_ENV.map(|x| x.as_str()).unwrap_or(""),
	)
}

fn get_version(impl_commit: &str) -> String {
	let commit_dash = if impl_commit.is_empty() { "" } else { "-" };

	format!(
		"{}{}{}-{}",
		std::env::var("CARGO_PKG_VERSION").unwrap_or_default(),
		commit_dash,
		impl_commit,
		get_platform(),
	)
}