use std::net::IpAddr;

use crate::actors::users_actor::UsersSyncBackend;
use crate::data::entity_manager::EntityManager;
use crate::data::user::{FactorID, GeneralSettings, GrantedClients, TwoFactor, User, UserID};
use crate::utils::err::{new_error, Res};
use crate::utils::time::time;

impl EntityManager<User> {
    /// Update user information
    fn update_user<F>(&mut self, id: &UserID, update: F) -> Res
    where
        F: FnOnce(User) -> User,
    {
        let user = match self.find_by_user_id(id)? {
            None => return new_error(format!("Failed to find user {id:?}")),
            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 Err(e);
        }

        Ok(())
    }
}

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

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

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

    fn get_entire_users_list(&self) -> Res<Vec<User>> {
        Ok(self.cloned())
    }

    fn create_user_account(&mut self, settings: GeneralSettings) -> Res<UserID> {
        let mut user = User {
            uid: UserID(uuid::Uuid::new_v4().to_string()),
            ..Default::default()
        };
        user.update_general_settings(settings);
        self.insert(user.clone())?;
        Ok(user.uid)
    }

    fn set_general_user_settings(&mut self, settings: GeneralSettings) -> Res {
        self.update_user(&settings.uid.clone(), |mut user| {
            user.update_general_settings(settings);
            user
        })
    }

    fn change_user_password(&mut self, id: &UserID, password: &str, temporary: bool) -> Res {
        let new_hash = hash_password(password)?;

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

    fn verify_user_password(&self, user: &UserID, password: &str) -> Res<bool> {
        Ok(self
            .find_by_user_id(user)?
            .map(|u| verify_password(password, &u.password))
            .unwrap_or(false))
    }

    fn add_2fa_factor(&mut self, id: &UserID, factor: TwoFactor) -> Res {
        self.update_user(id, |mut user| {
            user.two_factor.push(factor);
            user
        })
    }

    fn remove_2fa_factor(&mut self, id: &UserID, factor_id: FactorID) -> Res {
        self.update_user(id, |mut user| {
            user.two_factor.retain(|f| f.id != factor_id);
            user
        })
    }

    fn save_new_successful_2fa_authentication(&mut self, id: &UserID, ip: IpAddr) -> Res {
        self.update_user(id, |mut user| {
            user.last_successful_2fa.insert(ip, time());

            // Remove outdated successful attempts
            user.remove_outdated_successful_2fa_attempts();

            user
        })
    }

    fn clear_2fa_login_history(&mut self, id: &UserID) -> Res {
        self.update_user(id, |mut user| {
            user.last_successful_2fa = Default::default();
            user
        })
    }

    fn delete_account(&mut self, id: &UserID) -> Res {
        let user = match self.find_by_user_id(id)? {
            None => {
                return new_error(format!(
                    "Could not delete account {id:?} because it was not found!"
                ));
            }
            Some(s) => s,
        };

        self.remove(&user)
    }

    fn set_granted_2fa_clients(&mut self, id: &UserID, clients: GrantedClients) -> Res {
        self.update_user(id, |mut user| {
            user.authorized_clients = clients.to_user();
            user
        })
    }
}