use actix_web::{HttpResponse, Responder, Result, post, web};
use serde::Deserialize;
use utoipa::ToSchema;

use crate::{
    app::App,
    storage::sql::{
        barcode::Barcode,
        insert::Operations,
        product::{Product, ProductId, ProductIdStub},
        unit::Unit,
    },
};

#[derive(Deserialize, ToSchema)]
struct ProductStub {
    name: String,
    description: Option<String>,
    parent: Option<ProductId>,
}

/// Register a product
#[utoipa::path(
    responses(
        (
            status = 200,
            description = "Product successfully registered in database",
            body = ProductId,
        ),
        (
            status = INTERNAL_SERVER_ERROR,
            description = "Server encountered error",
            body = String,
        )
    ),
    request_body = ProductStub,
)]
#[post("/product/new")]
pub(crate) async fn register_product(
    app: web::Data<App>,
    product_stub: web::Json<ProductStub>,
) -> Result<impl Responder> {
    let mut ops = Operations::new("register product");

    let product = Product::register(
        product_stub.name.clone(),
        product_stub.description.clone(),
        product_stub.parent,
        &mut ops,
    );

    ops.apply(&app).await?;

    Ok(HttpResponse::Ok().json(product.id))
}

/// Associate a barcode with a product
#[utoipa::path(
    responses(
        (
            status = OK,
            description = "Barcode successfully associated with product",
        ),
        (
            status = NOT_FOUND,
            description = "Product id not found in database",
        ),
        (
            status = FORBIDDEN,
            description = "Unit used in request has not been registered yet",
            body = String,
        ),
        (
            status = INTERNAL_SERVER_ERROR,
            description = "Server encountered error",
            body = String,
        )
    ),
    params (
        ("id" = ProductId, description = "The id of the product to associated the barcode with"),
    ),
    request_body = Barcode,
)]
#[post("/product/{id}/associate")]
pub(crate) async fn associate_barcode(
    app: web::Data<App>,
    id: web::Path<ProductIdStub>,
    barcode: web::Json<Barcode>,
) -> Result<impl Responder> {
    let mut ops = Operations::new("associated barcode with product");

    {
        let units = Unit::get_all(&app).await?;
        if !units.into_iter().any(|unit| unit.id == barcode.amount.unit) {
            return Ok(HttpResponse::Forbidden()
                .body("The used unit has not been registered; it cannot be used.\n"));
        }
    }

    match Product::from_id(&app, id.into_inner().into()).await? {
        Some(product) => {
            product.associate_barcode(barcode.into_inner(), &mut ops);

            ops.apply(&app).await?;

            Ok(HttpResponse::Ok().finish())
        }
        None => Ok(HttpResponse::NotFound().finish()),
    }
}