use crate::errors::BumperError;
use log::{debug, info};
use std::path::{Path, PathBuf};
use std::process::Command;

pub struct Debian {
    dirname: PathBuf,
}

impl Debian {
    pub fn new(dirname: &Path) -> Result<Self, BumperError> {
        let changelog = dirname.join("debian/changelog");
        if changelog.exists() {
            info!("directory {} contains Debian packaging", dirname.display());
            return Ok(Self {
                dirname: dirname.to_path_buf(),
            });
        }
        debug!(
            "directory {} doesn't contains Debian packaging",
            dirname.display()
        );
        Err(BumperError::UnknownProjectKind(dirname.to_path_buf()))
    }

    pub fn set_version(&mut self, version: &str) -> Result<(), BumperError> {
        let version = format!("{}-1", version);
        self.dch(&["-v", &version, ""])?;
        self.dch(&["-r", ""])?;
        Ok(())
    }

    fn dch(&self, args: &[&str]) -> Result<(), BumperError> {
        let output = Command::new("dch")
            .args(args)
            .current_dir(&self.dirname)
            .output()
            .map_err(|err| BumperError::DchInvoke(self.dirname.to_path_buf(), err))?;
        if output.status.success() {
            Ok(())
        } else {
            let stderr = String::from_utf8_lossy(&output.stderr).into_owned();
            Err(BumperError::Dch(self.dirname.to_path_buf(), stderr))
        }
    }
}