use graphql_client::reqwest::post_graphql;
use web_sys::HtmlInputElement;
use yew::prelude::*;
use yew_router::prelude::*;
use yew_side_effect::title::Title;

use crate::components;
use crate::cookie_names;
use crate::graphql;
use crate::routes;

pub enum Msg {
    Submit,
    Login(Option<Vec<String>>),
}

pub struct Login {
    username: NodeRef,
    password: NodeRef,
    errors: Option<Vec<String>>,
}

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

    fn create(_ctx: &Context<Self>) -> Self {
        Self {
            username: NodeRef::default(),
            password: NodeRef::default(),
            errors: None,
        }
    }

    fn update(&mut self, ctx: &Context<Self>, msg: Self::Message) -> bool {
        match msg {
            Msg::Submit => {
                if let (Some(username), Some(password)) = (
                    self.username.cast::<HtmlInputElement>().map(|x| x.value()),
                    self.password.cast::<HtmlInputElement>().map(|x| x.value()),
                ) {
                    if !username.is_empty() && !password.is_empty() {
                        ctx.link().send_future(async {
                            let response = post_graphql::<graphql::mutations::login::Login, _>(
                                &graphql::client(None).unwrap(),
                                graphql::URL.as_str(),
                                graphql::mutations::login::login::Variables { username, password },
                            )
                            .await
                            .unwrap();

                            if response.errors.is_some() {
                                wasm_cookies::delete(cookie_names::TOKEN);
                            } else {
                                wasm_cookies::set(
                                    cookie_names::TOKEN,
                                    &response.data.unwrap().login.unwrap().token,
                                    &wasm_cookies::CookieOptions::default(),
                                )
                            }

                            Msg::Login(components::graphql_errors::convert(response.errors))
                        });
                    }
                }

                false
            }
            Msg::Login(errors) => {
                self.errors = errors;
                if self.errors.is_none() {
                    ctx.link().history().unwrap().push(routes::Route::Home);
                    false
                } else {
                    true
                }
            }
        }
    }

    fn view(&self, ctx: &Context<Self>) -> Html {
        let onsubmit = ctx.link().callback(|e: FocusEvent| {
            e.prevent_default();

            Msg::Submit
        });

        html! {
            <>
                <Title value="Login" />
                <form {onsubmit}>
                    <label for="username">
                        { "Benutzername:" }
                        <br />
                        <input ref={self.username.clone()} type="text" id="username" name="username" />
                    </label>

                    <br />

                    <label for="password">
                        { "Kennwort:" }
                        <br />
                        <input ref={self.password.clone()} type="password" id="password" name="password" />
                    </label>

                    <br /><br />

                    <button type="submit">{ "Login" }</button>

                    <components::graphql_errors::GraphQLErrors errors={self.errors.clone()} />
                </form>
            </>

        }
    }
}