use std::error::Error;
use std::fmt;
use std::path::Path;

use crate::command_runner::CommandRunner;
use crate::symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction, SymbolRunner};

pub struct MariaDBDatabase<'a, D: AsRef<str>, S: AsRef<Path>, C: CommandRunner> {
  db_name: D,
  seed_file: S,
  command_runner: &'a C,
}

impl<'a, D: AsRef<str>, S: AsRef<Path>, C: CommandRunner> MariaDBDatabase<'a, D, S, C> {
  pub fn new(db_name: D, seed_file: S, command_runner: &'a C) -> Self {
    MariaDBDatabase {
      db_name,
      seed_file,
      command_runner,
    }
  }

  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])?;
    Ok(String::from_utf8(b)?)
  }
}

impl<'a, D: AsRef<str>, S: AsRef<Path>, C: CommandRunner> fmt::Display
  for MariaDBDatabase<'a, D, S, C>
{
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "MariaDB Database {}", self.db_name.as_ref())
  }
}

impl<'a, D: AsRef<str>, S: AsRef<Path>, C: CommandRunner> Symbol for MariaDBDatabase<'a, D, S, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    Ok(
      self
        .run_sql(&format!("SHOW DATABASES LIKE '{}'", self.db_name.as_ref()))?
        .trim_end()
        == self.db_name.as_ref(),
    )
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.run_sql(&format!("CREATE DATABASE {}", self.db_name.as_ref()))?;
    self.command_runner.run_successfully(
      "sh",
      args![
        "-c",
        format!(
          "mariadb '{}' < {}",
          self.db_name.as_ref(),
          self.seed_file.as_ref().to_str().unwrap()
        ),
      ],
    )
  }

  fn as_action<'b>(&'b self, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b> {
    Box::new(SymbolAction::new(runner, self))
  }

  fn into_action<'b>(self: Box<Self>, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b>
  where
    Self: 'b,
  {
    Box::new(OwnedSymbolAction::new(runner, *self))
  }
}

#[cfg(test)]
mod test {}