use crate::{cfg::TciConfig, error::{TciErr, TciResult}, git::TciRepo};

pub struct Tci {
	cfg: TciConfig,
	repo: TciRepo,
}

impl Tci {
	pub fn new() -> TciResult<Self> {
		let cfg = TciConfig::load()
			.unwrap_or_else(|e| {
				eprintln!("[!] invalid config: {e}");
				TciConfig::default()
			});

		let repo = TciRepo::new()?;

		Ok(Tci{cfg, repo})
	}

	/// check if tci is allowed to run for this repository
	pub fn allowed(&self) -> bool {
		if !self.cfg.allow_all && !self.repo.cfg.get_bool("tci.allow").unwrap_or(false) {
			return false; // we are in whitelist mode and this repo is not whitelisted
		}

		match self.cfg.branch.as_deref() {
			None => self.repo.updated("tci"),
			Some("") => true,
			Some(b) => self.repo.updated(b),
		}
	}

	pub fn run(&self) -> TciResult<()> {
		// run hooks
		for hook in &self.cfg.hooks {
			println!("[-] running hook ({hook})");
			Tci::exec(&self.repo.path, hook)?;
		}

		if !self.allowed() { return Ok(()) }

		let env = self.prepare_env()?;

		let tci_script = self.repo.cfg.get_string("tci.script")
			.unwrap_or_else(|_| ".tci".into());
		let tci_path = env.path().join(tci_script);

		if !tci_path.is_file() {
			return Err(TciErr::Missing);
		}

		println!("[+] running tci script for {}", self.repo.name);
		Tci::exec(env.path(), tci_path)?;
		println!("[o] tci complete");
	
		Ok(())
	}

	fn prepare_env(&self) -> TciResult<tempdir::TempDir> {
		let tmp = tempdir::TempDir::new(
			&format!("tci-{}", self.repo.name.replace('/', "_"))
		)?;
	
		// TODO recursive clone? automatically clone all submodules after?
		git2::build::RepoBuilder::new()
			.bare(false)
			.branch("tci")
			.clone(
				self.repo.path.to_str()
					.ok_or(TciErr::FsError("repo path is not a valid string"))?,
				tmp.path(),
			)?;

		Ok(tmp)
	}

	fn exec<S : AsRef<std::ffi::OsStr>>(cwd: &std::path::Path, s: S) -> TciResult<()> {
		match std::process::Command::new(s)
			.current_dir(cwd)
			// .stdin(self.stdin.clone()) // TODO not this easy
			.status()?
			.code()
		{
			Some(0) => Ok(()),
			Some(x) => Err(crate::error::TciErr::SubprocessError(x)),
			None => Err(crate::error::TciErr::SubprocessTerminated),
		}
	}

	#[allow(unused)]
	fn spawn<S : AsRef<std::ffi::OsStr>>(cwd: &std::path::Path, s: S) -> TciResult<std::process::Child> {
		Ok(
			std::process::Command::new(s)
				.current_dir(cwd)
				.spawn()?
		)
	}
}