use crate::{
    components::{
        change_password::ChangePasswordForm,
        create_group::CreateGroupForm,
        create_user::CreateUserForm,
        group_details::GroupDetails,
        group_table::GroupTable,
        login::LoginForm,
        logout::LogoutButton,
        reset_password_step1::ResetPasswordStep1Form,
        reset_password_step2::ResetPasswordStep2Form,
        router::{AppRoute, Link, NavButton},
        user_details::UserDetails,
        user_table::UserTable,
    },
    infra::cookies::get_cookie,
};
use yew::prelude::*;
use yew::services::ConsoleService;
use yew_router::{
    agent::{RouteAgentDispatcher, RouteRequest},
    route::Route,
    router::Router,
    service::RouteService,
};

pub struct App {
    link: ComponentLink<Self>,
    user_info: Option<(String, bool)>,
    redirect_to: Option<AppRoute>,
    route_dispatcher: RouteAgentDispatcher,
}

pub enum Msg {
    Login((String, bool)),
    Logout,
}

impl Component for App {
    type Message = Msg;
    type Properties = ();

    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
        let mut app = Self {
            link,
            user_info: get_cookie("user_id")
                .unwrap_or_else(|e| {
                    ConsoleService::error(&e.to_string());
                    None
                })
                .and_then(|u| {
                    get_cookie("is_admin")
                        .map(|so| so.map(|s| (u, s == "true")))
                        .unwrap_or_else(|e| {
                            ConsoleService::error(&e.to_string());
                            None
                        })
                }),
            redirect_to: Self::get_redirect_route(),
            route_dispatcher: RouteAgentDispatcher::new(),
        };
        app.apply_initial_redirections();
        app
    }

    fn update(&mut self, msg: Self::Message) -> ShouldRender {
        match msg {
            Msg::Login((user_name, is_admin)) => {
                self.user_info = Some((user_name.clone(), is_admin));
                self.route_dispatcher
                    .send(RouteRequest::ChangeRoute(Route::from(
                        self.redirect_to.take().unwrap_or_else(|| {
                            if is_admin {
                                AppRoute::ListUsers
                            } else {
                                AppRoute::UserDetails(user_name.clone())
                            }
                        }),
                    )));
            }
            Msg::Logout => {
                self.user_info = None;
                self.redirect_to = None;
            }
        }
        if self.user_info.is_none() {
            self.route_dispatcher
                .send(RouteRequest::ReplaceRoute(Route::new_no_state("/login")));
        }
        true
    }

    fn change(&mut self, _: Self::Properties) -> ShouldRender {
        false
    }

    fn view(&self) -> Html {
        let link = self.link.clone();
        let is_admin = self.is_admin();
        html! {
            <div class="container shadow-sm py-3">
              {self.view_banner()}
              <div class="row justify-content-center">
                <div class="shadow-sm py-3" style="max-width: 1000px">
                  <Router<AppRoute>
                    render = Router::render(move |s| Self::dispatch_route(s, &link, is_admin))
                  />
                </div>
              </div>
            </div>
        }
    }
}

impl App {
    fn get_redirect_route() -> Option<AppRoute> {
        let route_service = RouteService::<()>::new();
        let current_route = route_service.get_path();
        if current_route.is_empty()
            || current_route == "/"
            || current_route.contains("login")
            || current_route.contains("reset-password")
        {
            None
        } else {
            use yew_router::Switch;
            AppRoute::from_route_part::<()>(current_route, None).0
        }
    }

    fn apply_initial_redirections(&mut self) {
        let route_service = RouteService::<()>::new();
        let current_route = route_service.get_path();
        if current_route.contains("reset-password") {
            return;
        }
        match &self.user_info {
            None => {
                self.route_dispatcher
                    .send(RouteRequest::ReplaceRoute(Route::new_no_state("/login")));
            }
            Some((user_name, is_admin)) => match &self.redirect_to {
                Some(url) => {
                    self.route_dispatcher
                        .send(RouteRequest::ReplaceRoute(Route::from(url.clone())));
                }
                None => {
                    if *is_admin {
                        self.route_dispatcher
                            .send(RouteRequest::ReplaceRoute(Route::new_no_state("/users")));
                    } else {
                        self.route_dispatcher
                            .send(RouteRequest::ReplaceRoute(Route::from(
                                AppRoute::UserDetails(user_name.clone()),
                            )));
                    }
                }
            },
        }
    }

    fn dispatch_route(switch: AppRoute, link: &ComponentLink<Self>, is_admin: bool) -> Html {
        match switch {
            AppRoute::Login => html! {
                <LoginForm on_logged_in=link.callback(Msg::Login)/>
            },
            AppRoute::CreateUser => html! {
                <CreateUserForm/>
            },
            AppRoute::Index | AppRoute::ListUsers => html! {
                <div>
                  <UserTable />
                  <NavButton classes="btn btn-primary" route=AppRoute::CreateUser>{"Create a user"}</NavButton>
                </div>
            },
            AppRoute::CreateGroup => html! {
                <CreateGroupForm/>
            },
            AppRoute::ListGroups => html! {
                <div>
                  <GroupTable />
                  <NavButton classes="btn btn-primary" route=AppRoute::CreateGroup>{"Create a group"}</NavButton>
                </div>
            },
            AppRoute::GroupDetails(group_id) => html! {
                <GroupDetails group_id=group_id />
            },
            AppRoute::UserDetails(username) => html! {
                <UserDetails username=username is_admin=is_admin />
            },
            AppRoute::ChangePassword(username) => html! {
                <ChangePasswordForm username=username is_admin=is_admin />
            },
            AppRoute::StartResetPassword => html! {
                <ResetPasswordStep1Form />
            },
            AppRoute::FinishResetPassword(token) => html! {
                <ResetPasswordStep2Form token=token />
            },
        }
    }

    fn view_banner(&self) -> Html {
        html! {
          <header class="p-3 mb-4 border-bottom shadow-sm">
            <div class="container">
              <div class="d-flex flex-wrap align-items-center justify-content-center justify-content-lg-start">
                <a href="/" class="d-flex align-items-center mb-2 mb-lg-0 me-md-5 text-dark text-decoration-none">
                  <h1>{"LLDAP"}</h1>
                </a>

                <ul class="nav col-12 col-lg-auto me-lg-auto mb-2 justify-content-center mb-md-0">
                  {if self.is_admin() { html! {
                    <>
                      <li>
                        <Link
                          classes="nav-link px-2 link-dark h4"
                          route=AppRoute::ListUsers>
                          {"Users"}
                        </Link>
                      </li>
                      <li>
                        <Link
                          classes="nav-link px-2 link-dark h4"
                          route=AppRoute::ListGroups>
                          {"Groups"}
                        </Link>
                      </li>
                    </>
                  } } else { html!{} } }
                </ul>

                <div class="dropdown text-end">
                  <a href="#"
                    class="d-block link-dark text-decoration-none dropdown-toggle"
                    id="dropdownUser"
                    data-bs-toggle="dropdown"
                    aria-expanded="false">
                    <svg xmlns="http://www.w3.org/2000/svg"
                      width="32"
                      height="32"
                      fill="currentColor"
                      class="bi bi-person-circle"
                      viewBox="0 0 16 16">
                      <path d="M11 6a3 3 0 1 1-6 0 3 3 0 0 1 6 0z"/>
                      <path fill-rule="evenodd" d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8zm8-7a7 7 0 0 0-5.468 11.37C3.242 11.226 4.805 10 8 10s4.757 1.225 5.468 2.37A7 7 0 0 0 8 1z"/>
                    </svg>
                  </a>
                  {if let Some((user_id, _)) = &self.user_info { html! {
                    <ul
                      class="dropdown-menu text-small dropdown-menu-lg-end"
                      aria-labelledby="dropdownUser1"
                      style="">
                      <li>
                        <Link
                          classes="dropdown-item"
                          route=AppRoute::UserDetails(user_id.clone())>
                          {"Profile"}
                        </Link>
                      </li>
                      <li><hr class="dropdown-divider" /></li>
                      <li>
                        <LogoutButton on_logged_out=self.link.callback(|_| Msg::Logout) />
                      </li>
                    </ul>
                  } } else { html!{} } }
                </div>
              </div>
            </div>
          </header>
        }
    }

    fn is_admin(&self) -> bool {
        match &self.user_info {
            None => false,
            Some((_, is_admin)) => *is_admin,
        }
    }
}