use sqlx::{
  query,
  Database,
  Pool,
  Postgres,
  pool::PoolOptions,
  postgres::{
    PgConnectOptions,
    PgSslMode,
  },
  Result,
};
use std::string::ToString;

pub struct Db<Dbimp: Database> {
  pool: Pool<Dbimp>
}

#[non_exhaustive]
enum Role {
  Owner,
  Participant
}

impl ToString for Role {
  fn to_string(&self) -> String {
    match *self {
      Role::Owner => "owner".to_string(),
      Role::Participant => "participant".to_string(),
    }
  }
}

pub struct Session {
  sessionuri: Uri,
  label: Option<String>,
  participants: Vec<Participant>,
}

impl Db<Postgres> {
  async fn connect() -> Result<Self> {
    let conn = PgConnectOptions::new()
      .host("localhost")
      .port(5432)
      .username("postgres")
      .password("062217")
      .database("anisky")
      .ssl_mode(PgSslMode::Disable);

    let pool = match PoolOptions::new().connect_with(conn).await {
      Ok(p) => p,
      Err(e) => return Err(e),
    };

    Ok(Db { pool })
  }
  //
  // pub async fn add_user(&self, user: &User) -> Result<()> {
  //   query!(r#"
  //       INSERT INTO users(userdid, handle) VALUES ($1, $2)
  //     "#,
  //     user.userdid, user.handle
  //   ).execute(self.pool).await?;
  //   Ok(())
  // }
  //
  // pub async fn add_session(&self, session: &Session) -> Result<()> {
  //   let mut transaction = self.pool.begin().await?;
  //
  //   query!(r#"
  //       INSERT INTO sessions(sessionuri, label) VALUES ($1, $2)
  //     "#,
  //     session.sessionuri, session.label
  //   ).execute(&mut *transaction).await?;
  //   
  //   for participant in session.participants {
  //     query!(r#"
  //         INSERT INTO participants(sessionuri, userdid, role) VALUES ($1, $2, $3)
  //       "#,
  //       session.sessionuri, participant.userdid, participant.role.to_string()
  //     ).execute(&mut *transaction).await?;
  //   }
  //
  //   transaction.commit().await
  // }
  //
  // pub async fn add_participant(&self, session: Session, 
  //   participant: Participant) -> Result<Session> {
  //   query!(r#"
  //       INSERT INTO participants(sessionuri, userdid, role) VALUES ($1, $2, $3)
  //     "#,
  //     session.sessionuri, participant.userdid, participant.role.to_string()
  //   ).execute(self.pool).await?;
  //   
  //   session.participants.push(participant);
  //
  //   Ok(session)
  // }
}