use bounce::helmet::Helmet;
use cynic::QueryBuilder;
use std::rc::Rc;
use web_sys::HtmlInputElement;
use yew::prelude::*;
use yew_router::prelude::*;
use yewdux::prelude::*;

use crate::{
    components,
    graphql::{self, ReqwestExt},
    routes, stores,
};

pub enum Msg {
    UpdateUser(Rc<stores::User>),
    UpdateNotifications(Rc<stores::Notifications>),
    Login,
    LoginDone {
        user_data: stores::UserData,
        result: graphql::GraphQLResult<graphql::queries::VerifyLogin>,
    },
}

pub struct Login {
    user: Rc<stores::User>,
    user_dispatch: Dispatch<stores::User>,
    notifications: Rc<stores::Notifications>,
    notifications_dispatch: Dispatch<stores::Notifications>,
    username: NodeRef,
    password: NodeRef,
    loading: bool,
    error: Option<&'static str>,
}

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

    fn create(ctx: &Context<Self>) -> Self {
        let user_dispatch = Dispatch::subscribe(ctx.link().callback(Msg::UpdateUser));
        let notifications_dispatch =
            Dispatch::subscribe(ctx.link().callback(Msg::UpdateNotifications));

        Self {
            user: user_dispatch.get(),
            user_dispatch,
            notifications: notifications_dispatch.get(),
            notifications_dispatch,
            username: NodeRef::default(),
            password: NodeRef::default(),
            loading: false,
            error: None,
        }
    }

    fn update(&mut self, ctx: &Context<Self>, msg: Self::Message) -> bool {
        match msg {
            Msg::UpdateUser(x) => {
                self.error = None;

                let prev = self.user.logged_in();
                self.user = x;

                prev != self.user.logged_in()
            }
            Msg::UpdateNotifications(x) => {
                self.notifications = x;

                false
            }
            Msg::Login => {
                self.error = None;

                let username = match self.username.cast::<HtmlInputElement>().map(|x| x.value()) {
                    Some(x) => {
                        if x.is_empty() {
                            return false;
                        } else {
                            x
                        }
                    }
                    None => {
                        return false;
                    }
                };
                let password = match self.password.cast::<HtmlInputElement>().map(|x| x.value()) {
                    Some(x) => {
                        if x.is_empty() {
                            return false;
                        } else {
                            x
                        }
                    }
                    None => {
                        return false;
                    }
                };

                self.loading = true;
                let operation =
                    graphql::queries::VerifyLogin::build(graphql::queries::VerifyLoginVariables {
                        username: username.to_owned(),
                        password: password.to_owned(),
                    });
                ctx.link().send_future(async move {
                    Msg::LoginDone {
                        user_data: stores::UserData { username, password },
                        result: graphql::client(None).run_graphql(operation).await,
                    }
                });

                true
            }
            Msg::LoginDone { user_data, result } => {
                self.loading = false;

                match result {
                    Ok(resp) => {
                        if let Some(errors) = resp.errors {
                            self.notifications_dispatch.reduce_mut(|notifs| {
                                for e in errors {
                                    notifs.push(stores::Notification::danger(Some(
                                        components::notification::NotificationMessage::GraphQLError(
                                            e,
                                        ),
                                    )));
                                }
                            });

                            true
                        } else if resp.data.unwrap().verify_login {
                            self.error = None;
                            self.user_dispatch.set(stores::User(Some(user_data)));

                            false
                        } else {
                            const MESSAGE: &str = "Username or password not correct";

                            self.error = Some(MESSAGE);
                            self.notifications_dispatch.reduce_mut(|notifs| {
                                notifs.push(stores::Notification {
                                    notification_type:
                                        components::notification::NotificationType::Danger,
                                    message: Some(
                                        components::notification::NotificationMessage::Text(vec![
                                            MESSAGE.to_string(),
                                        ]),
                                    ),
                                });
                            });

                            true
                        }
                    }
                    Err(e) => {
                        self.notifications_dispatch.reduce_mut(|notifs| {
                            notifs.push(stores::Notification {
                                notification_type:
                                    components::notification::NotificationType::Danger,
                                message: Some(components::notification::NotificationMessage::Text(
                                    vec![e.to_string()],
                                )),
                            });
                        });

                        false
                    }
                }
            }
        }
    }

    fn view(&self, ctx: &Context<Self>) -> Html {
        if self.user.logged_in() {
            ctx.link().navigator().unwrap().push(&routes::Route::Index);
        }

        html! {
            <>
                <Helmet>
                    <title>{ "Login" }</title>
                </Helmet>

                <div class={classes!("columns", "is-centered", "my-auto")}>
                    <div class={classes!("column", "is-half", "box")}>
                        <div class={classes!("p-4")}>
                            <form onsubmit={ctx.link().callback(|e: SubmitEvent| { e.prevent_default(); Msg::Login })}>
                                <div class={classes!("field")}>
                                    <p class={classes!("control", "has-icons-left")}>
                                        <input
                                            class={classes!("input")}
                                            type="text"
                                            placeholder="Username"
                                            ref={self.username.clone()}
                                        />
                                        <span class={classes!("icon", "is-small", "is-left")}>
                                            <i class={classes!("fa-solid", "fa-envelope")} />
                                        </span>
                                    </p>
                                </div>
                                <div class={classes!("field")}>
                                    <p class={classes!("control", "has-icons-left")}>
                                        <input
                                            class={classes!("input")}
                                            type="password"
                                            placeholder="Password"
                                            ref={self.password.clone()}
                                        />
                                        <span class={classes!("icon", "is-small", "is-left")}>
                                            <i class={classes!("fa-solid", "fa-lock")} />
                                        </span>
                                    </p>
                                </div>
                                <div class={classes!("field")}>
                                    <p class={classes!("control")}>
                                        <button
                                            type="submit"
                                            class={classes!("button", "is-success", "is-fullwidth", if self.loading { Some("is-loading") } else { None })}
                                        >
                                            { "Login" }
                                        </button>
                                    </p>
                                </div>
                                if let Some(message) = self.error {
                                    <p class={classes!("help", "is-danger")}>
                                        { message }
                                    </p>
                                }
                            </form>
                        </div>
                    </div>
                </div>
            </>
        }
    }
}