use crate::data::client::ClientID;
use crate::data::entity_manager::EntityManager;
use crate::data::login_redirect::LoginRedirect;
use crate::data::totp_key::TotpKey;
use crate::utils::err::Res;

pub type UserID = String;

#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
pub struct FactorID(pub String);

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
pub enum TwoFactorType {
    TOTP(TotpKey)
}

#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
pub struct TwoFactor {
    pub id: FactorID,
    pub name: String,
    pub kind: TwoFactorType,
}

impl TwoFactor {
    pub fn type_str(&self) -> &'static str {
        match self.kind {
            TwoFactorType::TOTP(_) => "Authenticator app"
        }
    }

    pub fn login_url(&self, redirect_uri: &LoginRedirect) -> String {
        match self.kind {
            TwoFactorType::TOTP(_) => format!("/2fa_otp?id={}&redirect_uri={}",
                                              self.id.0, redirect_uri.get_encoded())
        }
    }
}

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

    /// 2FA
    #[serde(default)]
    pub two_factor: Vec<TwoFactor>,

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

impl User {
    pub fn full_name(&self) -> String {
        format!("{} {}", self.first_name, self.last_name)
    }

    pub fn can_access_app(&self, id: &ClientID) -> bool {
        match &self.authorized_clients {
            None => true,
            Some(c) => c.contains(id)
        }
    }

    pub fn verify_password<P: AsRef<[u8]>>(&self, pass: P) -> bool {
        verify_password(pass, &self.password)
    }

    pub fn has_two_factor(&self) -> bool {
        !self.two_factor.is_empty()
    }

    pub fn add_factor(&mut self, factor: TwoFactor) {
        self.two_factor.push(factor);
    }

    pub fn remove_factor(&mut self, factor_id: FactorID) {
        self.two_factor.retain(|f| f.id != factor_id);
    }

    pub fn find_factor(&self, factor_id: &FactorID) -> Option<&TwoFactor> {
        self.two_factor.iter().find(|f| f.id.eq(&factor_id))
    }
}

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_name: "".to_string(),
            username: "".to_string(),
            email: "".to_string(),
            password: "".to_string(),
            need_reset_password: false,
            enabled: true,
            admin: false,
            two_factor: vec![],
            authorized_clients: Some(Vec::new()),
        }
    }
}

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
        })
    }
}