// rocie - An enterprise grocery management system - Web app
//
// Copyright (C) 2026 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Rocie.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

use std::{convert::Infallible, iter, str::FromStr};

use leptos::{
    IntoView, component,
    prelude::{Get, Show, signal},
    task::spawn_local,
    view,
};
use leptos_router::{NavigateOptions, hooks::use_navigate};
use rocie_client::models::{ProductParentId, ProductParentStub};
use rocie_macros::Form;

use crate::{
    api::{get_config, product_parents_wrapped, register_product_parent_external_wrapped},
    components::{
        async_fetch::AsyncResource, banner::Banner, catch_errors::CatchErrors,
        login_wall::LoginWall, site_header::SiteHeader,
    },
};

struct OptionalString(Option<String>);

impl FromStr for OptionalString {
    type Err = Infallible;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if s.is_empty() {
            Ok(Self(None))
        } else {
            Ok(Self(Some(s.to_owned())))
        }
    }
}

struct OptionalParentId(Option<ProductParentId>);

impl FromStr for OptionalParentId {
    type Err = uuid::Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if s.is_empty() {
            Ok(Self(None))
        } else {
            Ok(Self(Some(ProductParentId { value: s.parse()? })))
        }
    }
}

#[component]
pub fn CreateProductParent() -> impl IntoView {
    let (error_message, error_message_set) = signal(None);

    view! {
        <CatchErrors>
            <LoginWall back=move || "/create-product-parent".to_owned()>
                <SiteHeader
                    logo=icondata_io::IoArrowBack
                    back_location="/"
                    name="Create Product Parent"
                />

                <Show when=move || error_message.get().is_some()>
                    <Banner text=move || error_message.get().expect("Is some") />
                </Show>

                {
                    Form! {
                        on_submit = |name, description, parent| {
                    let config = get_config!();
                    let navigate = use_navigate();

                    spawn_local(async move {
                        match register_product_parent_external_wrapped(&config, ProductParentStub {
                                description: description.0.map(|d| d.trim().to_owned()),
                                name: name.trim().to_owned(),
                                parent: parent.0,
                            }
                        ).await {
                            Ok(_id) => {
                                navigate("/create-product-parent", NavigateOptions::default());
                            }
                            Err(err) => error_message_set.set(Some(format!("Failed to create product: {err}"))),
                        }
                    });
                };

                <Input
                    name=name,
                    rust_type=String,
                    html_type="text",
                    label="Product Name",
                />

                <Input
                    name=description,
                    rust_type=OptionalString,
                    html_type="text",
                    label="Product Description"
                />

                <Select
                    name=parent,
                    rust_type=OptionalParentId,
                    label="Parent",
                    options=AsyncResource! {
                        () -> Result<Vec<(String, String)>, leptos::error::Error> {
                            let parents = product_parents_wrapped().await?;

                            Ok(
                                iter::once(("No parent".to_owned(), String::new()))
                                    .chain(
                                        parents
                                            .into_iter()
                                            .map(|prop| (prop.name, prop.id.to_string()))
                                    )
                                    .collect()
                            )
                        }
                    },
                />
                    }
                }
            </LoginWall>
        </CatchErrors>
    }
}