#![cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
use models::{NewUser, User};
use rocket::{
    request::{FlashMessage, Form},
    response::{Flash, Redirect},
    Route,
};
use utils::{DbConn, Page};

#[derive(BartDisplay)]
#[template = "templates/users.html"]
pub struct UsersTemplate {
    users: Vec<User>,
}

implement_responder_for!(UsersTemplate);

#[get("/", format = "text/html")]
fn index(flash: Option<FlashMessage>, conn: DbConn) -> Page<UsersTemplate> {
    Page {
        title: String::from("Users"),
        flash,
        content: UsersTemplate {
            users: User::all(&conn).unwrap(),
        },
    }
}

#[derive(BartDisplay)]
#[template = "templates/edit_user.html"]
pub struct EditUserTemplate {
    user: User,
}

implement_responder_for!(EditUserTemplate);

#[get("/<id>/edit")]
fn edit(id: i32, conn: DbConn) -> Page<EditUserTemplate> {
    Page {
        title: String::from("Edit users"),
        flash: None,
        content: EditUserTemplate {
            user: User::by_id(id, &conn).unwrap(),
        },
    }
}

#[get("/<id>/delete")]
fn delete(id: i32, route: &Route, conn: DbConn) -> Flash<Redirect> {
    match User::delete(id, &conn) {
        Ok(user) => Flash::success(
            Redirect::to(route.base.path()),
            format!("User {} was successfully deleted.", user.username),
        ),
        Err(msg) => Flash::error(
            Redirect::to(route.base.path()),
            format!("Error deleting user: {}", msg),
        ),
    }
}

#[derive(BartDisplay)]
#[template = "templates/new_user.html"]
pub struct NewUserTemplate {
    user: NewUser,
}

implement_responder_for!(NewUserTemplate);

#[get("/new", format = "text/html")]
fn new(flash: Option<FlashMessage>) -> Page<NewUserTemplate> {
    Page {
        title: String::from("New user"),
        flash,
        content: NewUserTemplate {
            user: Default::default(),
        },
    }
}

#[derive(FromForm)]
struct RegisterUserForm {
    username: String,
    realname: Option<String>,
    email: Option<String>,
    password: String,
    password_confirm: String,
}

impl RegisterUserForm {
    fn new_user(&self) -> Result<NewUser, &'static str> {
        if self.password != self.password_confirm {
            Err("Passwords don't match")
        }
        else {
            Ok(NewUser {
                username: self.username.clone(),
                realname: self.realname.clone(),
                email: self.email.clone(),
                password: self.password.clone(),
            })
        }
    }

    fn attrs(&self) -> Result<User, &'static str> {
        if self.password != self.password_confirm {
            Err("Passwords don't match")
        }
        else {
            Ok(User {
                id: Default::default(),
                username: self.username.clone(),
                realname: self.realname.clone(),
                email: self.email.clone(),
                password: self.password.clone(),
            })
        }
    }
}

#[post("/create", data = "<user>")]
fn create(user: Form<RegisterUserForm>, route: &Route, conn: DbConn) -> Flash<Redirect> {
    match user.get().new_user() {
        Ok(new_user) => match User::create(&new_user, &conn) {
            Ok(_) => Flash::success(
                Redirect::to(route.base.path()),
                "User successfully created!",
            ),
            Err(_) => Flash::error(Redirect::to("/"), "Could not create user!"),
        },
        Err(msg) => Flash::error(Redirect::to(&format!("{}/new", route.base.path())), &msg),
    }
}

#[post("/<id>/update", data = "<user_form>")]
fn update(
    id: i32,
    user_form: Form<RegisterUserForm>,
    route: &Route,
    conn: DbConn,
) -> Flash<Redirect> {
    match user_form.get().attrs() {
        Ok(attrs) => {
            if let Ok(mut user) = User::by_id(id, &conn) {
                if user.username != attrs.username {
                    user.username = attrs.username.clone();
                }
                if user.realname != attrs.realname {
                    user.realname = attrs.realname.clone();
                }
                if user.email != attrs.email {
                    user.email = attrs.email.clone();
                }
                if !attrs.password.is_empty() && user.password != attrs.password {
                    user.password = attrs.password.clone();
                }
                match User::update(&user, &conn) {
                    Ok(user) => Flash::success(
                        Redirect::to(route.base.path()),
                        format!("User {} updated successfully", user.username),
                    ),
                    Err(msg) => Flash::error(
                        Redirect::to(route.base.path()),
                        format!("User {} was not updated! {}", user.username, msg),
                    ),
                }
            }
            else {
                Flash::error(
                    Redirect::to(route.base.path()),
                    "Can't delete users which does not exist",
                )
            }
        }
        Err(msg) => Flash::error(
            Redirect::to(route.base.path()),
            format!("Invalid form data: {}", msg),
        ),
    }
}

pub fn routes() -> Vec<Route> {
    routes![index, new, create, edit, update, delete]
}