use crate::command_runner::CommandRunner;
use crate::symbols::Symbol;
use async_trait::async_trait;
use std::error::Error;

#[derive(Debug)]
pub struct User<'a, U, C> {
  user_name: U,
  command_runner: &'a C,
}

impl<'a, U: AsRef<str>, C: CommandRunner> User<'a, U, C> {
  pub fn new(user_name: U, command_runner: &'a C) -> Self {
    Self {
      user_name,
      command_runner,
    }
  }

  async fn run_sql(&self, sql: &str) -> Result<String, Box<dyn Error>> {
    let b = self
      .command_runner
      .get_output("mariadb", args!["--skip-column-names", "-B", "-e", sql])
      .await?;
    Ok(String::from_utf8(b)?)
  }
}

#[async_trait(?Send)]
impl<U: AsRef<str>, C: CommandRunner> Symbol for User<'_, U, C> {
  async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    Ok(
      self
        .run_sql(&format!(
          "SELECT User FROM mysql.user WHERE User = '{}' AND plugin = 'unix_socket'",
          self.user_name.as_ref()
        ))
        .await?
        .trim_end()
        == self.user_name.as_ref(),
    )
  }

  async fn execute(&self) -> Result<(), Box<dyn Error>> {
    self
      .run_sql(&format!(
        "GRANT ALL ON {0}.* TO {0} IDENTIFIED VIA unix_socket",
        self.user_name.as_ref()
      ))
      .await?;
    Ok(())
  }
}

#[cfg(test)]
mod test {}