use perseus::prelude::*;
use serde::Deserialize;
use sycamore::prelude::*;

use crate::{
    api::types::paginated_response::{IntoTableData, PaginatedResponse},
    components::{
        base_table::{BaseTable, TableContentRx},
        loading::Loading,
    },
};

#[derive(Prop)]
pub struct PaginatedTableStateRx<'a, M, F, C>
where
    M: 'a,
    C: Fn(Option<String>, i64, i64) -> F,
    F: std::future::Future<Output = Result<PaginatedResponse<M>, ()>> + 'a,
{
    pub record_label: String,
    pub route: &'a C,
    pub filter: Option<String>,
    pub table_class: &'a String,
    pub refresh: &'a Signal<bool>,
}

impl<'a, M, F, C> PaginatedTableStateRx<'a, M, F, C>
where
    M: 'a,
    C: Fn(Option<String>, i64, i64) -> F,
    F: std::future::Future<Output = Result<PaginatedResponse<M>, ()>> + 'a,
{
    async fn get_data(&self, page: i64, size: i64) -> Result<PaginatedResponse<M>, ()> {
        (self.route)(self.filter.clone(), page, size).await
    }
}

/// This is a generic component that will display a paginated table given a
/// function of the generic signature C and a filter represented by an Option<String>
#[component]
pub fn PaginatedTable<'a, G, M, F, C>(
    cx: Scope<'a>,
    props: PaginatedTableStateRx<'a, M, F, C>,
) -> View<G>
where
    G: Html,
    M: 'a + Clone,
    PaginatedResponse<M>: IntoTableData<G>,
    for<'de> M: Deserialize<'de>,
    C: Fn(Option<String>, i64, i64) -> F,
    F: std::future::Future<Output = Result<PaginatedResponse<M>, ()>> + 'a,
{
    let paginated_data = create_signal(cx, None);
    let table_prop: TableContentRx<G> = TableContentRx {
        headers_view: create_signal(cx, vec![]),
        data_view: create_signal(cx, vec![vec![]]),
        table_class: props.table_class,
    };
    let page = create_signal(cx, 0);
    let n_page = create_signal(cx, 1);
    let n_rows = create_signal(cx, 0);

    let page_up = move |_| {
        n_page.set(
            (*paginated_data.get())
                .clone()
                .map_or(0, |t: PaginatedResponse<M>| t.num_pages),
        );
        if *page.get() + 1 < *n_page.get() {
            page.set((*page.get()).min(*n_page.get() - 1) + 1)
        }
    };
    let page_down = |_| {
        if *page.get() > 0 {
            page.set((*page.get() - 1).max(0));
        }
    };

    let page_size_string = create_signal(cx, "20".to_string());

    create_effect(cx, move || {
        page_size_string.track();
        page.set(0);
    });

    let props_sig = create_signal(cx, props);

    #[cfg(client)]
    let data_fetch = move || {
        spawn_local_scoped(cx, async move {
            let res = props_sig
                .get()
                .get_data(*page.get(), page_size_string.get().parse().unwrap_or(20))
                .await
                .unwrap();
            paginated_data.set(Some(res.clone()));
            n_rows.set(res.count);
            let table_content = res.into_table_data(cx);
            table_prop.data_view.set(table_content.data_view);
            table_prop.headers_view.set(table_content.headers_view);
            n_page.set((*paginated_data.get()).as_ref().map_or(0, |t| t.num_pages));
        })
    };

    #[cfg(client)]
    create_effect(cx, move || {
        if *props_sig.get().refresh.get() {
            props_sig.get().refresh.set(false);
            data_fetch()
        }
    });

    #[cfg(client)]
    create_effect(cx, move || {
        page.track();
        page_size_string.track();
        data_fetch();
    });

    view! { cx,
    (if paginated_data.get().is_some() {
        if *n_rows.get() == 0 {
            view!{cx,
                div (class="text-center rounded-md bg-slate-200 dark:bg-slate-800") {
                    (format!("No {}", props_sig.get().record_label))
                }
            }
        }
        else {
            view! {cx,
            p (class="text-right") { (format!("{} {}", n_rows.get(), props_sig.get().record_label)) }
            div (class="flex flex-row justify-between") {
                select (bind:value=page_size_string,
                        class="justify-end p-2 rounded-md text-slate-700 bg-slate-200 dark:text-slate-100 dark:bg-slate-800",
                        id="size-select",
                        ) {
                    option (value="10", selected=(*page_size_string.get()).eq("10")) { "10" }
                    option (value="20", selected=(*page_size_string.get()).eq("20")) { "20" }
                    option (value="30", selected=(*page_size_string.get()).eq("30")) { "30" }
                    option (value="40", selected=(*page_size_string.get()).eq("40")) { "40" }
                    option (value="50", selected=(*page_size_string.get()).eq("50")) { "50" }
                }
                div (id="page_buttons", class="flex flex-row p-2 rounded-md bg-slate-200 dark:bg-slate-800") {
                    button (on:click=page_down,class="m-1 hover:font-bold") {
                        "<<"
                    }
                    div (class="m-1 text-center align-middle") {
                        (format!("{}/{}",*page.get() + 1, *n_page.get()) )
                    }
                    button (on:click=page_up, class="m-1 hover:font-bold") {
                        ">>"
                    }
                }
            }
            BaseTable(headers_view=table_prop.headers_view, data_view=table_prop.data_view, table_class=table_prop.table_class)
            }
        }
    } else {
        view! {cx,
            div (class="flex flex-row justify-center") {
                Loading()
            }
        }
    })
    }
}