/*! Users are entities that interact with the system.
 *
* They are notably separate from any API tokens.
*/

use std::fmt::{Debug, Display};

use argon2::{password_hash::{rand_core::OsRng, SaltString}, Argon2};
use chrono::{DateTime, Utc};

use crate::errors::{EmptyResult, Result};

/** A single User with access to the system
 *
 * The specific User object contains profile and biographic data that's either useful to ACM or
 * required by external partners (see: MLH).
 */
#[derive(Clone)]
struct User {
    /// Unique user identifier, a V4 UUID
    id: uuid::Uuid,
    /// The user's name. Not guaranteed to be anything in particular, should be
    /// treated as a standard UTF8 string
    name: String,
    /// User's (hashed) password
    password_hash: String,
    /// User's email. This must be validated for correct format!
    email: String,
    /// Whether the user is allowed to log in.
    is_active: bool,
    /// UTC date/time of creation
    created: chrono::DateTime<Utc>,
    /// UTC date/time of last login
    last_login: Option<DateTime<Utc>>,
}

impl Display for User {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{} ({})", self.email, self.id)
    }
}

impl Debug for User {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{} ({})", self.email, self.id)
    }
}

impl User {
    pub fn new_user() -> Self {
        Self { id: uuid::Uuid::new_v4(), name: String::new(), password_hash: String::new(), email: String::new(), is_active: true, created: Utc::now(), last_login: None }  
    }
    pub fn set_password(new_pw: String) -> EmptyResult {

        let argon = Argon2::default();
        let salt = SaltString::generate(&mut OsRng);

        let mut out: Vec<u8> = Vec::new();
        
        Ok(())
    }
}