use rocket;
use rocket::request::Form;
use rocket::response::{Flash, Redirect};
use utils;

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

implement_responder_for!(UsersTemplate);

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

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

implement_responder_for!(EditUserTemplate);

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

#[get("/<id>/delete")]
fn delete(id: i32, route: &rocket::Route, conn: utils::DbConn) -> Flash<Redirect> {
    match ::models::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: ::models::NewUser
}

implement_responder_for!(NewUserTemplate);

#[get("/new", format = "text/html")]
fn new(flash: Option<rocket::request::FlashMessage>) -> utils::Page<NewUserTemplate> {
    utils::Page {
        title: String::from("New user"),
        flash: 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<::models::NewUser, &'static str> {
        if self.password != self.password_confirm {
            Err("Passwords don't match")
        }
        else {
            Ok(::models::NewUser {
                username: self.username.clone(),
                realname: self.realname.clone(),
                email: self.email.clone(),
                password: self.password.clone()
            })
        }
    }

    fn attrs(&self) -> Result<::models::User, &'static str> {
        if self.password != self.password_confirm {
            Err("Passwords don't match")
        }
        else {
            Ok(::models::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: &rocket::Route, conn: utils::DbConn) -> Flash<Redirect> {
    match user.get().new_user() {
        Ok(new_user) => {
            match ::models::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: &rocket::Route, conn: utils::DbConn) -> Flash<Redirect> {
    match user_form.get().attrs() {
        Ok(attrs) => {
            if let Ok(mut user) = ::models::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 ::models::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<rocket::Route> {
    routes![index, new, create, edit, update, delete]
}