use leptos::{either::Either, prelude::*};
use serde::{Deserialize, Serialize};
#[cfg(feature = "ssr")]
use {crate::db::user, leptos::server_fn::error::NoCustomError, sqlx::SqlitePool};

use super::BeaconResources;

#[derive(Clone, Serialize, Deserialize)]
pub struct Category {
    pub category_id: i64,
    pub category_name: String,
}

#[server(prefix = "/api/categories", endpoint = "get")]
pub async fn get_categories() -> Result<Vec<Category>, ServerFnError> {
    let user = user::get_auth_session().await?;

    if user.is_none() {
        return Err(ServerFnError::<NoCustomError>::ServerError(
            "You are not signed in!".to_owned(),
        ));
    }

    let db = crate::db::get_db()?;

    Ok(sqlx::query_as!(Category, "SELECT * FROM beacon_category")
        .fetch_all(&db)
        .await?)
}

#[server(prefix = "/api/categories", endpoint = "add")]
pub async fn add_category(name: String) -> Result<(), ServerFnError> {
    let user = user::get_auth_session().await?;

    if user.is_none() {
        return Err(ServerFnError::<NoCustomError>::ServerError(
            "You are not signed in!".to_owned(),
        ));
    }

    let db = crate::db::get_db()?;

    sqlx::query!(
        "INSERT INTO beacon_category (category_name) VALUES (?)",
        name
    )
    .execute(&db)
    .await?;

    Ok(())
}

#[server(prefix = "/api/categories", endpoint = "remove")]
pub async fn remove_category(id: i64) -> Result<(), ServerFnError> {
    let user = user::get_auth_session().await?;

    if user.is_none() {
        return Err(ServerFnError::<NoCustomError>::ServerError(
            "You are not signed in!".to_owned(),
        ));
    }

    let db = crate::db::get_db()?;

    sqlx::query!("DELETE FROM beacon_category WHERE category_id = ?", id)
        .execute(&db)
        .await?;

    Ok(())
}

#[server(prefix = "/api/categories", endpoint = "rename")]
pub async fn rename_category(id: i64, name: String) -> Result<(), ServerFnError> {
    let user = user::get_auth_session().await?;

    if user.is_none() {
        return Err(ServerFnError::<NoCustomError>::ServerError(
            "You are not signed in!".to_owned(),
        ));
    }

    let db = crate::db::get_db()?;

    sqlx::query!(
        "UPDATE beacon_category SET category_name = ? WHERE category_id = ?",
        name,
        id
    )
    .execute(&db)
    .await?;

    Ok(())
}

#[component]
pub fn CategoriesView() -> impl IntoView {
    let BeaconResources {
        add_category,
        categories,
        ..
    } = expect_context();

    view! {
        <div class="categories">
            <h2>"Categories"</h2>
            <p>
                "Categories are an optional organization method that can be used to group beacons. Beacons can be assigned to multiple categories"
            </p>

            <ActionForm action=add_category>
                <fieldset>
                    {move || match add_category.value().get() {
                        Some(Ok(_)) => Either::Right(()),
                        None => Either::Right(()),
                        Some(Err(e)) => Either::Left(view! {
                            <p>"Error creating category:"</p>
                            <p>{format!("{e:?}")}</p>
                        })
                    }}
                    <legend>"Add a new beacon category"</legend>
                    <label>"Category name"</label>
                    <input name="name"/>
                    <div></div>
                    <input type="submit" value="Submit" disabled=move||add_category.pending() />
                </fieldset>
            </ActionForm>

            <Suspense fallback=|| view! { <p>"Loading..."</p> }>
                { move || match categories.get() {
                    Some(inner) => Either::Right(match inner {
                        Err(e) => Either::Left(view! {
                            <p>"There was an error loading categories:"</p>
                            <p>{format!("error: {e:?}")}</p>
                        }),
                        Ok(cs) => Either::Right(view! {
                            <DisplayCategories categories=cs/>
                        })
                    }),
                    None => Either::Left(view! {
                        <p>"Loading..."</p>
                    })
                }}
            </Suspense>
        </div>
    }
}

#[component]
fn DisplayCategories(categories: Vec<Category>) -> impl IntoView {
    let BeaconResources {
        remove_category,
        rename_category,
        ..
    } = expect_context();

    let (target_rename_id, set_target_rename_id) = signal(0);
    let target_rename_name = RwSignal::new("".to_owned());

    let dialog_ref = NodeRef::<leptos::html::Dialog>::new();

    let categories_view = categories
        .iter()
        .map(|category| {
            view! {
                <li>
                    {category.category_id}
                    ": "
                    {category.category_name.clone()}
                    <button
                        on:click={
                            let id = category.category_id;
                            let name = category.category_name.clone();
                            let set_target_rename_id = set_target_rename_id.clone();
                            let target_rename_name = target_rename_name.clone();
                            move |_| {
                                set_target_rename_id(id);
                                target_rename_name.set(name.clone());

                                if let Some(dialog) = dialog_ref.get() {
                                    let _ = dialog.show_modal();
                                }
                            }
                        }
                    >
                        "rename"
                    </button>
                    <button
                        on:click={
                            let id = category.category_id;
                            move |_| {
                                remove_category.dispatch(RemoveCategory { id });
                            }
                        }
                    >
                        "delete"
                    </button>
                </li>
            }
        })
        .collect_view();

    Effect::watch(
        move || {
            (
                rename_category.version().get(),
                rename_category.value().get(),
                dialog_ref.get(),
            )
        },
        move |(_, res, dialog_ref), _, _| {
            if let (Some(Ok(())), Some(dialog)) = (res, dialog_ref) {
                let _ = dialog.close();
            }
        },
        false,
    );

    view! {
        <dialog node_ref=dialog_ref>
            <ActionForm action=rename_category>
                {move || match rename_category.value().get() {
                    Some(Ok(_)) => Either::Right(()),
                    None => Either::Right(()),
                    Some(Err(e)) => Either::Left(view! {
                        <p>"Failed to rename category:"</p>
                        <p>{format!("{e:?}")}</p>
                    })
                }}
                <fieldset>
                    <legend>"Rename category"</legend>
                    <label>"Name"</label>
                    <input name="name" bind:value=target_rename_name />
                    <input type="hidden" name="id" value=move||target_rename_id.get() />
                    <div></div>
                    <input type="submit" value="Submit" disabled=move||rename_category.pending()/>
                </fieldset>
            </ActionForm>
        </dialog>
        {move || match remove_category.value().get() {
            Some(Ok(_)) => Either::Right(()),
            None => Either::Right(()),
            Some(Err(e)) => Either::Left(view! {
                <p>"Failed to remove category:"</p>
                <p>{format!("{e:?}")}</p>
            })
        }}
        <ul>
            {categories_view}
        </ul>
    }
}