use crate::data::entity_manager::EntityManager;
use crate::data::service::ServiceID;
use crate::utils::err::Res;

pub type UserID = String;

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
pub struct User {
    pub uid: UserID,
    pub first_name: String,
    pub last_last: String,
    pub username: String,
    pub email: String,
    pub password: String,
    pub need_reset_password: bool,
    pub enabled: bool,
    pub admin: bool,

    /// None = all services
    /// Some([]) = no service
    pub authorized_services: Option<Vec<ServiceID>>,
}

impl PartialEq for User {
    fn eq(&self, other: &Self) -> bool {
        self.uid.eq(&other.uid)
    }
}

impl Eq for User {}

impl Default for User {
    fn default() -> Self {
        Self {
            uid: uuid::Uuid::new_v4().to_string(),
            first_name: "".to_string(),
            last_last: "".to_string(),
            username: "".to_string(),
            email: "".to_string(),
            password: "".to_string(),
            need_reset_password: false,
            enabled: true,
            admin: false,
            authorized_services: None,
        }
    }
}

pub fn hash_password<P: AsRef<[u8]>>(pwd: P) -> Res<String> {
    Ok(bcrypt::hash(pwd, bcrypt::DEFAULT_COST)?)
}

pub fn verify_password<P: AsRef<[u8]>>(pwd: P, hash: &str) -> bool {
    match bcrypt::verify(pwd, hash) {
        Ok(r) => r,
        Err(e) => {
            log::warn!("Failed to verify password! {:?}", e);
            false
        }
    }
}

impl EntityManager<User> {
    pub fn find_by_username_or_email(&self, u: &str) -> Option<User> {
        for entry in self.iter() {
            if entry.username.eq(u) || entry.email.eq(u) {
                return Some(entry.clone());
            }
        }
        None
    }

    pub fn find_by_user_id(&self, id: &UserID) -> Option<User> {
        for entry in self.iter() {
            if entry.uid.eq(id) {
                return Some(entry.clone());
            }
        }
        None
    }

    /// Update user information
    fn update_user<F>(&mut self, id: &UserID, update: F) -> bool where F: FnOnce(User) -> User {
        let user = match self.find_by_user_id(id) {
            None => return false,
            Some(user) => user
        };

        if let Err(e) = self.replace_entries(|u| u.uid.eq(id), &update(user)) {
            log::error!("Failed to update user information! {:?}", e);
            return false;
        }

        true
    }

    pub fn change_user_password(&mut self, id: &UserID, password: &str, temporary: bool) -> bool {
        let new_hash = match hash_password(password) {
            Ok(h) => { h }
            Err(e) => {
                log::error!("Failed to hash user password! {}", e);
                return false;
            }
        };

        self.update_user(id, |mut user| {
            user.password = new_hash;
            user.need_reset_password = temporary;
            user
        })
    }
}