extern crate bcrypt;

use bcrypt::{hash, DEFAULT_COST};
use diesel::Insertable;
use uuid::Uuid;

use crate::schema::users;

pub const MIN_PASSWORD_LENGTH: usize = 6;

/// Rejects empty/trivial passwords. Kept as a standalone function so callers
/// (e.g. the user-creation handler) can return a `400` for this case
/// specifically, rather than the `500` that `NewUser::new`'s `anyhow::Result`
/// would otherwise map to.
pub fn validate_password(password: &str) -> Result<(), &'static str> {
    if password.trim().len() < MIN_PASSWORD_LENGTH {
        return Err("password must be at least 6 characters long");
    }
    Ok(())
}

#[derive(Insertable, Clone)]
#[diesel(table_name=users)]
pub struct NewUser {
    pub username: String,
    pub email: String,
    pub password: String,
    pub unique_id: String,
}

impl NewUser {
    pub fn new(username: String, email: String, password: String) -> anyhow::Result<NewUser> {
        validate_password(&password).map_err(anyhow::Error::msg)?;
        let hashed_password: String = hash(password.as_str(), DEFAULT_COST)?;
        let uuid = Uuid::new_v4();
        Ok(NewUser {
            username,
            email,
            password: hashed_password,
            unique_id: uuid.to_string(),
        })
    }
}