use super::*;
use crate::schema::user_;
use crate::schema::user_::dsl::*;
use crate::{is_email_regex, Settings};
use bcrypt::{hash, DEFAULT_COST};
use jsonwebtoken::{decode, encode, Header, TokenData, Validation};

#[derive(Queryable, Identifiable, PartialEq, Debug)]
#[table_name = "user_"]
pub struct User_ {
  pub id: i32,
  pub name: String,
  pub fedi_name: String,
  pub preferred_username: Option<String>,
  pub password_encrypted: String,
  pub email: Option<String>,
  pub icon: Option<Vec<u8>>,
  pub admin: bool,
  pub banned: bool,
  pub published: chrono::NaiveDateTime,
  pub updated: Option<chrono::NaiveDateTime>,
  pub show_nsfw: bool,
  pub theme: String,
  pub default_sort_type: i16,
  pub default_listing_type: i16,
}

#[derive(Insertable, AsChangeset, Clone)]
#[table_name = "user_"]
pub struct UserForm {
  pub name: String,
  pub fedi_name: String,
  pub preferred_username: Option<String>,
  pub password_encrypted: String,
  pub admin: bool,
  pub banned: bool,
  pub email: Option<String>,
  pub updated: Option<chrono::NaiveDateTime>,
  pub show_nsfw: bool,
  pub theme: String,
  pub default_sort_type: i16,
  pub default_listing_type: i16,
}

impl Crud<UserForm> for User_ {
  fn read(conn: &PgConnection, user_id: i32) -> Result<Self, Error> {
    user_.find(user_id).first::<Self>(conn)
  }
  fn delete(conn: &PgConnection, user_id: i32) -> Result<usize, Error> {
    diesel::delete(user_.find(user_id)).execute(conn)
  }
  fn create(conn: &PgConnection, form: &UserForm) -> Result<Self, Error> {
    insert_into(user_).values(form).get_result::<Self>(conn)
  }
  fn update(conn: &PgConnection, user_id: i32, form: &UserForm) -> Result<Self, Error> {
    diesel::update(user_.find(user_id))
      .set(form)
      .get_result::<Self>(conn)
  }
}

impl User_ {
  pub fn register(conn: &PgConnection, form: &UserForm) -> Result<Self, Error> {
    let mut edited_user = form.clone();
    let password_hash =
      hash(&form.password_encrypted, DEFAULT_COST).expect("Couldn't hash password");
    edited_user.password_encrypted = password_hash;

    Self::create(&conn, &edited_user)
  }

  pub fn update_password(conn: &PgConnection, user_id: i32, form: &UserForm) -> Result<Self, Error> {
    let mut edited_user = form.clone();
    let password_hash =
      hash(&form.password_encrypted, DEFAULT_COST).expect("Couldn't hash password");
    edited_user.password_encrypted = password_hash;

    Self::update(&conn, user_id, &edited_user)
  }

  pub fn read_from_name(conn: &PgConnection, from_user_name: String) -> Result<Self, Error> {
    user_.filter(name.eq(from_user_name)).first::<Self>(conn)
  }
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Claims {
  pub id: i32,
  pub username: String,
  pub iss: String,
  pub show_nsfw: bool,
  pub theme: String,
  pub default_sort_type: i16,
  pub default_listing_type: i16,
}

impl Claims {
  pub fn decode(jwt: &str) -> Result<TokenData<Claims>, jsonwebtoken::errors::Error> {
    let v = Validation {
      validate_exp: false,
      ..Validation::default()
    };
    decode::<Claims>(&jwt, Settings::get().jwt_secret.as_ref(), &v)
  }
}

type Jwt = String;
impl User_ {
  pub fn jwt(&self) -> Jwt {
    let my_claims = Claims {
      id: self.id,
      username: self.name.to_owned(),
      iss: self.fedi_name.to_owned(),
      show_nsfw: self.show_nsfw,
      theme: self.theme.to_owned(),
      default_sort_type: self.default_sort_type,
      default_listing_type: self.default_listing_type,
    };
    encode(
      &Header::default(),
      &my_claims,
      Settings::get().jwt_secret.as_ref(),
    )
    .unwrap()
  }

  pub fn find_by_email_or_username(
    conn: &PgConnection,
    username_or_email: &str,
  ) -> Result<Self, Error> {
    if is_email_regex(username_or_email) {
      user_
        .filter(email.eq(username_or_email))
        .first::<User_>(conn)
    } else {
      user_
        .filter(name.eq(username_or_email))
        .first::<User_>(conn)
    }
  }
  
  pub fn find_by_email(
    conn: &PgConnection,
    from_email: &str,
  ) -> Result<Self, Error> {
    user_
      .filter(email.eq(from_email))
      .first::<User_>(conn)
  }


  pub fn find_by_jwt(conn: &PgConnection, jwt: &str) -> Result<Self, Error> {
    let claims: Claims = Claims::decode(&jwt).expect("Invalid token").claims;
    Self::read(&conn, claims.id)
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  use super::User_;

  #[test]
  fn test_crud() {
    let conn = establish_connection();

    let new_user = UserForm {
      name: "thommy".into(),
      fedi_name: "rrf".into(),
      preferred_username: None,
      password_encrypted: "nope".into(),
      email: None,
      admin: false,
      banned: false,
      updated: None,
      show_nsfw: false,
      theme: "darkly".into(),
      default_sort_type: SortType::Hot as i16,
      default_listing_type: ListingType::Subscribed as i16,
    };

    let inserted_user = User_::create(&conn, &new_user).unwrap();

    let expected_user = User_ {
      id: inserted_user.id,
      name: "thommy".into(),
      fedi_name: "rrf".into(),
      preferred_username: None,
      password_encrypted: "nope".into(),
      email: None,
      icon: None,
      admin: false,
      banned: false,
      published: inserted_user.published,
      updated: None,
      show_nsfw: false,
      theme: "darkly".into(),
      default_sort_type: SortType::Hot as i16,
      default_listing_type: ListingType::Subscribed as i16,
    };

    let read_user = User_::read(&conn, inserted_user.id).unwrap();
    let updated_user = User_::update(&conn, inserted_user.id, &new_user).unwrap();
    let num_deleted = User_::delete(&conn, inserted_user.id).unwrap();

    assert_eq!(expected_user, read_user);
    assert_eq!(expected_user, inserted_user);
    assert_eq!(expected_user, updated_user);
    assert_eq!(1, num_deleted);
  }
}