#![allow(non_snake_case)]
use std::rc::Rc;

use api::{
    AddToHouseholdRequest, CreateHouseholdRequest, CreateHouseholdResponse, LoginRequest,
    LoginResponse, UserInfo,
};
use dioxus::prelude::*;
use dioxus_router::prelude::*;
use gloo_storage::{errors::StorageError, LocalStorage, Storage};
use itertools::Itertools;
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::bootstrap::{bs, FormModal, ModalToggleButton, Spinner};

mod bootstrap;
mod ingredients;
mod sidebar;

mod recipe;

mod full_context;

pub use full_context::{use_full_context, use_trimmed_context};
use sidebar::RegaladeSidebar;

const API_ROUTE: &str = match option_env!("REGALADE_API_SERVER_BASE") {
    None => "http://localhost:8085",
    Some(v) => v,
};

const FRONTEND_ROOT: &str = match option_env!("REGALADE_FRONTEND_DOMAIN") {
    None => "http://localhost:8080",
    Some(v) => v,
};

#[macro_export]
macro_rules! api {
    ($($arg:tt)*) => {{
        use $crate::API_ROUTE;
        &format!("{API_ROUTE}/api/{}", format_args!($($arg)*))
    }};
}

#[derive(Props)]
pub struct ErrorProps<'a> {
    error: &'a Option<String>,
}

pub fn ErrorView<'a>(cx: Scope<'a, ErrorProps<'a>>) -> Element {
    cx.props
        .error
        .as_ref()
        .and_then(|err| cx.render(rsx! { ErrorAlert { error: "{err}" } }))
}

#[inline_props]
pub fn ErrorAlert<'a>(cx: Scope<'a>, error: &'a str) -> Element<'a> {
    cx.render(rsx! {
        div { class: "alert alert-danger", *error }
    })
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct LoginInfo {
    token: String,
    name: String,
}

pub fn use_login(cx: &ScopeState) -> UseSharedState<LoginInfo> {
    use_shared_state::<LoginInfo>(cx)
        .expect("no login info in scope")
        .clone()
}

pub fn use_error(cx: &ScopeState) -> &UseState<Option<String>> {
    use_state(cx, || None)
}

#[derive(Clone)]
pub struct Callback {
    pub cb: Rc<dyn Fn()>,
}

impl Callback {
    pub fn call(&self) {
        (self.cb)()
    }
}

#[allow(clippy::vtable_address_comparisons)]
impl PartialEq for Callback {
    fn eq(&self, other: &Self) -> bool {
        Rc::ptr_eq(&self.cb, &other.cb)
    }
}

impl From<Rc<dyn Fn()>> for Callback {
    fn from(cb: Rc<dyn Fn()>) -> Self {
        Self { cb }
    }
}

impl<F> From<F> for Callback
where
    F: Fn() + 'static,
{
    fn from(cb: F) -> Self {
        Self { cb: Rc::new(cb) }
    }
}

pub fn use_refresh(cx: &ScopeState) -> (u64, Callback) {
    let refresh = use_state(cx, || 0u64);

    let callback = {
        to_owned![refresh];
        Callback::from(move || refresh.set(refresh.wrapping_add(1)))
    };

    (**refresh, callback)
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct HouseholdInfo {
    id: Uuid,
    name: String,
}

pub fn LoginRedirect(cx: Scope) -> Element {
    let navigator = use_navigator(cx);

    let token = match LocalStorage::get::<LoginInfo>("token") {
        Ok(v) => Some(v),
        Err(StorageError::KeyNotFound(_)) => {
            return None;
        }
        Err(e) => unreachable!("Could not get token: {e:?}"),
    };

    use_shared_state_provider(cx, || token.clone());

    cx.render(match token {
        Some(_) => rsx! {
            Outlet::<Route> {}
        },
        None => {
            navigator.push(Route::Login);
            rsx! {{}}
        }
    })
}

async fn do_login(username: String, password: String) -> anyhow::Result<()> {
    let rsp = gloo_net::http::Request::post(api!("login"))
        .json(&LoginRequest {
            username: username.clone(),
            password,
        })?
        .send()
        .await?;

    if rsp.status() == 404 {
        anyhow::bail!("Account not foud")
    } else if !rsp.ok() {
        let body = rsp.text().await?;
        anyhow::bail!("Request failed: {body:?}")
    }

    let rsp: LoginResponse = rsp.json().await?;

    LocalStorage::set(
        "token",
        LoginInfo {
            token: rsp.token,
            name: username,
        },
    )?;

    Ok(())
}

async fn check_oidc() -> anyhow::Result<bool> {
    let rsp = gloo_net::http::Request::get(api!("login/has_oidc"))
        .send()
        .await?;

    Ok(rsp.status() == 200)
}

fn Openid(cx: Scope) -> Element {
    let has = use_future(cx, (), |()| check_oidc());

    cx.render(match has.value().unwrap_or(&Ok(false)) {
        Ok(true) => {
            let route = api!("login/oidc").to_owned();
            let ret = urlencoding::encode(&format!("{FRONTEND_ROOT}/login/oidc")).to_string();
            rsx! {
                a {
                    href: "{route}?return={ret}",
                    class: "mt-1 w-100 btn btn-lg btn-primary",
                    "Login with OpenID"
                }
            }
        }
        Ok(false) => rsx! {{}},
        Err(e) => {
            log::error!("Could not check oidc status: {e:?}");
            rsx! {{}}
        }
    })
}

fn Login(cx: Scope) -> Element {
    let error = use_state(cx, || None::<String>);
    let navigator = use_navigator(cx);

    let on_submit = move |e: Event<FormData>| {
        to_owned![error, navigator];
        cx.spawn(async move {
            match do_login(
                e.values["username"][0].to_string(),
                e.values["password"][0].to_string(),
            )
            .await
            {
                Ok(_) => {
                    error.set(None);
                    navigator.push(Route::Index);
                }
                Err(e) => {
                    error.set(Some(format!("Could not log in: {e}")));
                }
            }
        })
    };

    cx.render(rsx! {
        link { href: "/login.css", rel: "stylesheet" }
        form {
            onsubmit: on_submit,
            prevent_default: "onsubmit",
            class: "form-signin w-100 m-auto text-center",
            h1 { class: "h3 mb-3", "Please log in" }
            ErrorView { error: error }
            div { class: "form-floating",
                input {
                    name: "username",
                    id: "floatingUser",
                    class: "form-control",
                    placeholder: "Username"
                }
                label { "for": "floatingUser", "Username" }
            }
            div { class: "form-floating",
                input {
                    name: "password",
                    id: "floatingPass",
                    class: "form-control",
                    placeholder: "Password",
                    "type": "password"
                }
                label { "for": "floatingPass", "Password" }
            }
            button { class: "w-100 btn btn-lg btn-primary", "type": "submit", "Login" }
            Openid {}
        }
    })
}

async fn do_new_household(token: String, name: String) -> anyhow::Result<Uuid> {
    let rsp = gloo_net::http::Request::post(api!("household"))
        .header("Authorization", &format!("Bearer {token}"))
        .json(&CreateHouseholdRequest { name })?
        .send()
        .await?;

    if !rsp.ok() {
        anyhow::bail!("Request failed: {rsp:?}")
    }

    let rsp: CreateHouseholdResponse = rsp.json().await?;

    Ok(rsp.id)
}

async fn do_resolve_user(token: String, username: String) -> anyhow::Result<Option<Uuid>> {
    let rsp = gloo_net::http::Request::get(api!("search/user/{username}"))
        .header("Authorization", &format!("Bearer {token}"))
        .send()
        .await?;

    if rsp.status() == 404 {
        return Ok(None);
    }

    if !rsp.ok() {
        anyhow::bail!("Request failed: {rsp:?}")
    }

    let rsp: UserInfo = rsp.json().await?;

    Ok(Some(rsp.id))
}

pub async fn do_add_user_to_household(
    token: String,
    household: Uuid,
    user: Uuid,
) -> anyhow::Result<()> {
    let rsp = gloo_net::http::Request::put(api!("household/{household}"))
        .header("Authorization", &format!("Bearer {token}"))
        .json(&AddToHouseholdRequest { user })?
        .send()
        .await?;

    if !rsp.ok() {
        anyhow::bail!("Request failed: {rsp:?}")
    }

    Ok(())
}

fn CreateHousehold(cx: Scope) -> Element {
    let login = use_login(cx);
    let error = use_state(cx, || None::<String>);
    let name = use_state(cx, String::new);

    let members = use_ref(cx, Vec::<(Uuid, String)>::new);

    let navigator = use_navigator(cx);

    let token = login.read().token.clone();
    let on_submit = move |_| {
        to_owned![members, name, error, token, navigator];

        cx.spawn(async move {
            match do_new_household(token.clone(), name.to_string()).await {
                Ok(id) => {
                    let info = HouseholdInfo {
                        id,
                        name: name.to_string(),
                    };

                    for (uid, user) in members.read().iter() {
                        if let Err(e) = do_add_user_to_household(token.clone(), id, *uid).await {
                            error.set(Some(format!(
                                "Could not add user {user} (but household was created): {e:?}"
                            )));
                            return;
                        }
                    }

                    if let Err(e) = LocalStorage::set("household", info) {
                        log::error!("Could not switch to new household: {e:?}");
                    };

                    let modal = bs::Modal::get_instance("#newHsModal");
                    modal.hide();

                    navigator.push(Route::Index);
                    error.set(None);
                }
                Err(e) => {
                    error.set(Some(format!("Could not create household: {e:?}")));
                }
            }
        })
    };

    let new_member = use_state(cx, String::new);
    let token = login.read().token.clone();
    let on_add_member = move |_| {
        to_owned![new_member, members, error, token];

        cx.spawn(async move {
            match do_resolve_user(token, new_member.to_string()).await {
                Err(e) => {
                    error.set(Some(format!("Could not add member: {e:?}")));
                }
                Ok(None) => {
                    error.set(Some(format!("User {new_member} does not exist")));
                }
                Ok(Some(id)) => {
                    members.with_mut(|m| {
                        if !m.iter().any(|&(i, _)| i == id) {
                            m.push((id, new_member.to_string()))
                        }
                    });
                    error.set(None);
                }
            }
        });
    };

    cx.render(rsx! {
        FormModal {
            id: "newHsModal",
            fade: true,
            centered: true,
            submit_label: "Create",
            title: "Create a Household",
            on_submit: on_submit,
            ErrorView { error: error }
            div { class: "form-floating",
                input {
                    id: "newHsName",
                    class: "form-control",
                    placeholder: "Household name",
                    oninput: move |ev| name.set(ev.value.clone())
                }
                label { "for": "newHsName", "Household name" }
            }
            h2 { class: "fs-5 m-2", "Additional Members" }
            ul { class: "list-group list-group-flush",
                for (idx , (id , name)) in members.read().iter().enumerate() {
                    li { key: "{id}", class: "list-group-item",
                        "{name}"
                        button {
                            "type": "button",
                            class: "btn btn-danger ms-2",
                            onclick: move |_| {
                                members
                                    .with_mut(|m| {
                                        m.remove(idx);
                                    })
                            },
                            "Remove"
                        }
                    }
                }
            }
            div { class: "d-flex flex-row",
                input {
                    id: "newHsAddMember",
                    class: "form-control me-2",
                    oninput: move |ev| new_member.set(ev.value.clone()),
                    placeholder: "Additional member"
                }
                button { "type": "button", class: "btn btn-primary", onclick: on_add_member, "Add" }
            }
        }
    })
}

async fn fetch_households(token: String) -> anyhow::Result<api::Households> {
    let rsp = gloo_net::http::Request::get(api!("household"))
        .header("Authorization", &format!("Bearer {token}"))
        .send()
        .await?;

    if !rsp.ok() {
        anyhow::bail!("Request failed: {rsp:?}")
    }

    let rsp: api::Households = rsp.json().await?;

    Ok(rsp)
}

fn HouseholdListSelect(cx: Scope) -> Element {
    let login = use_login(cx);
    let households = use_future(cx, (), |_| fetch_households(login.read().token.clone()));
    let navigator = use_navigator(cx);

    cx.render(match households.value() {
        Some(Ok(response)) => {
            let households = response
                .households
                .iter()
                .sorted_by_key(|(_, i)| i.name.clone())
                .map(|(id, info)| {
                    let onclick = move |_| {
                        if let Err(e) = LocalStorage::set(
                            "household",
                            HouseholdInfo {
                                id: *id,
                                name: info.name.clone(),
                            },
                        ) {
                            log::error!("Could not select household: {e:?}");
                            return;
                        }

                        navigator.push(Route::Index);
                    };
                    rsx! {button { key: "{id}", class: "btn btn-secondary m-1", onclick: onclick, "{info.name}" }}
                });
            rsx! {households}
        }
        Some(Err(e)) => {
            rsx! { div { class: "alert alert-danger", "Could not fetch households: {e:?}" } }
        }
        None => rsx! { Spinner {} },
    })
}

fn HouseholdSelection(cx: Scope) -> Element {
    cx.render(rsx! {
        link { href: "/household_selection.css", rel: "stylesheet" }
        div { class: "col-sm-3 m-auto p-2 text-center border rounded",
            h1 { class: "h3", "Available" }
            hr {}
            HouseholdListSelect {}
            hr {}
            ModalToggleButton { class: "btn btn-lg btn-primary", modal_id: "newHsModal", "New household" }
            CreateHousehold {}
        }
    })
}

fn Index(cx: Scope) -> Element {
    cx.render(rsx! {"INDEX"})
}

#[derive(Deserialize, PartialEq, Clone)]
struct OidcQuery {
    token: String,
    username: String,
}

#[derive(PartialEq, Props)]
struct OidcProps {
    token: String,
    username: String,
}

fn OidcRedirect(cx: Scope<OidcProps>) -> Element {
    cx.render({
        match LocalStorage::set(
            "token",
            LoginInfo {
                token: cx.props.token.clone(),
                name: cx.props.username.clone(),
            },
        ) {
            Ok(_) => {
                gloo_utils::window().location().replace("/").unwrap();
                rsx! {{}}
            }
            Err(_) => rsx! {"Could not store authentication, try again."},
        }
    })
}

use ingredients::Ingredients;
use recipe::{RecipeCreator, RecipeList, RecipeView};

#[rustfmt::skip]
#[derive(Clone, Routable)]
enum Route {
    #[route("/login")]
    Login,
    #[route("/login/oidc?:token?:username")]
    OidcRedirect { token: String, username: String },

    #[layout(LoginRedirect)]
        #[route("/household_selection")]
        HouseholdSelection,
    #[end_layout]

    #[layout(RegaladeSidebar)]
        #[route("/")]
        Index,
        #[route("/ingredients")]
        Ingredients,
        #[route("/recipe_creator")]
        RecipeCreator,
        #[nest("/recipe")]
            #[route("/")]
            RecipeList,
            #[route("/:id")]
            RecipeView {id: i64}
}

fn App(cx: Scope) -> Element {
    cx.render(rsx! {
        Router::<Route> {}
    })
}

fn main() {
    console_log::init_with_level(log::Level::Info).unwrap();

    let html = gloo_utils::document_element();
    html.set_attribute("data-bs-theme", "dark")
        .expect("could not set dark theme");

    dioxus_web::launch(App)
}