use std::borrow::Cow;
use std::error::Error;
use std::fmt;

use command_runner::CommandRunner;
use symbols::Symbol;

pub struct MariaDBDatabase<'a> {
  db_name: Cow<'a, str>,
  seed_file: &'a str,
  command_runner: &'a CommandRunner
}

impl<'a> MariaDBDatabase<'a> {
  pub fn new(db_name: Cow<'a, str>, command_runner: &'a CommandRunner) -> MariaDBDatabase<'a> {
    MariaDBDatabase {
      db_name: db_name,
      seed_file: "/root/seedfile.sql",
      command_runner: command_runner
    }
  }

  fn run_sql(&self, sql: &str) -> Result<String, Box<Error>> {
    let output = try!(self.command_runner.run_with_args("mariadb", &["--skip-column-names", "-B", "-e", sql]));
    if output.status.code() != Some(0) {
      return Err(try!(String::from_utf8(output.stderr)).into());
    }
    Ok(try!(String::from_utf8(output.stdout)))
  }
}

impl<'a> fmt::Display for MariaDBDatabase<'a> {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    write!(f, "MariaDB Database {}", self.db_name)
  }
}

impl<'a> Symbol for MariaDBDatabase<'a> {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    Ok(try!(self.run_sql(&format!("SHOW DATABASES LIKE '{}'", self.db_name))).trim_right() == self.db_name)
  }

  fn execute(&self) -> Result<(), Box<Error>> {
    try!(self.run_sql(&format!("CREATE DATABASE {}", self.db_name)));
    try!(self.command_runner.run_with_args("sh", &["-c", &format!("mariadb '{}' < {}", self.db_name, self.seed_file)]));
    Ok(())
  }
}

#[cfg(test)]
mod test {
}