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

pub struct PostgreSQLDatabase<'a, N: AsRef<str>, S: AsRef<str>, C: CommandRunner> {
  name: N,
  seed_file: S,
  command_runner: &'a C,
}

impl<'a, N: AsRef<str>, S: AsRef<str>, C: CommandRunner> PostgreSQLDatabase<'a, N, S, C> {
  pub fn new(name: N, seed_file: S, command_runner: &'a C) -> Self {
    PostgreSQLDatabase {
      name,
      seed_file,
      command_runner,
    }
  }

  fn run_sql(&self, sql: &str) -> Result<String, Box<dyn Error>> {
    let b = self.command_runner.get_output(
      "su",
      args!["-", "postgres", "-c", format!("psql -t -c \"{}\"", sql)],
    )?;
    Ok(String::from_utf8(b)?)
  }
}

impl<N: AsRef<str>, S: AsRef<str>, C: CommandRunner> fmt::Display
  for PostgreSQLDatabase<'_, N, S, C>
{
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "PostgreSQL Database {}", self.name.as_ref())
  }
}

impl<N: AsRef<str>, S: AsRef<str>, C: CommandRunner> Symbol for PostgreSQLDatabase<'_, N, S, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    Ok(
      self
        .run_sql(&format!(
          "SELECT datname FROM pg_database WHERE datname LIKE '{}'",
          self.name.as_ref()
        ))?
        .trim()
        == self.name.as_ref(),
    )
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.command_runner.run_successfully(
      "su",
      args![
        "-",
        "postgres",
        "-c",
        format!("createuser {}", self.name.as_ref())
      ],
    )?;
    self.command_runner.run_successfully(
      "su",
      args![
        "-",
        "postgres",
        "-c",
        format!(
          "createdb -E UTF8 -T template0 -O {} {0}",
          self.name.as_ref()
        ),
      ],
    )?;
    self.command_runner.run_successfully(
      "su",
      args![
        "-",
        "postgres",
        "-c",
        format!(
          "psql '{}' < {}",
          self.name.as_ref(),
          self.seed_file.as_ref()
        ),
      ],
    )
  }
}

#[cfg(test)]
mod test {}