use actix_web::{HttpRequest, HttpResponse, Responder, Result, get, web};
use log::info;
use percent_encoding::percent_decode_str;

use crate::{
    app::App,
    storage::sql::{
        product::{Product, ProductId, ProductIdStub},
        product_amount::ProductAmount,
        product_parent::{ProductParent, ProductParentId, ProductParentIdStub},
    },
};

/// A String, that is not url-decoded on parse.
struct UrlEncodedString(String);

impl UrlEncodedString {
    /// Percent de-encode a given string
    fn percent_decode(&self) -> Result<String, std::str::Utf8Error> {
        percent_decode_str(self.0.replace('+', "%20").as_str())
            .decode_utf8()
            .map(|s| s.to_string())
            .inspect(|s| info!("Decoded `{}` as `{s}`", self.0))
    }

    fn from_str(inner: &str) -> Self {
        Self(inner.to_owned())
    }
}

/// Get Product by id
#[utoipa::path(
    responses(
        (status = OK, description = "Product found from database", body = Product),
        (status = NOT_FOUND, description = "Product not found in database"),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
    params(
        ("id" = ProductId, description = "Product id" ),
    )
)]
#[get("/product/by-id/{id}")]
pub(crate) async fn product_by_id(
    app: web::Data<App>,
    id: web::Path<ProductIdStub>,
) -> Result<impl Responder> {
    let id = id.into_inner();

    match Product::from_id(&app, id.into()).await? {
        Some(product) => Ok(HttpResponse::Ok().json(product)),
        None => Ok(HttpResponse::NotFound().finish()),
    }
}

/// Get Product by name
#[utoipa::path(
    responses(
        (status = OK, description = "Product found from database", body = Product),
        (status = NOT_FOUND, description = "Product not found in database"),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
    params(
        ("name" = String, description = "Name of the product" ),
    )
)]
#[get("/product/by-name/{name}")]
pub(crate) async fn product_by_name(
    app: web::Data<App>,
    req: HttpRequest,
    name: web::Path<String>,
) -> Result<impl Responder> {
    drop(name);

    let name = UrlEncodedString::from_str(
        req.path()
            .strip_prefix("/product/by-name/")
            .expect("Will always exists"),
    );
    let name = name.percent_decode()?;

    match Product::from_name(&app, name).await? {
        Some(product) => Ok(HttpResponse::Ok().json(product)),
        None => Ok(HttpResponse::NotFound().finish()),
    }
}

/// Get Product suggestion by name
#[utoipa::path(
    responses(
        (status = OK, description = "Product suggestions found from database", body = Vec<Product>),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
    params(
        ("name" = String, description = "Partial name of a product" ),
    )
)]
#[get("/product/by-part-name/{name}")]
pub(crate) async fn product_suggestion_by_name(
    app: web::Data<App>,
    req: HttpRequest,
    name: web::Path<String>,
) -> Result<impl Responder> {
    drop(name);

    let name = UrlEncodedString::from_str(
        req.path()
            .strip_prefix("/product/by-part-name/")
            .expect("Will always exists"),
    );
    let name = &name.percent_decode()?;

    let all = Product::get_all(&app).await?;

    let matching = all
        .into_iter()
        .filter(|product| product.name.starts_with(name.as_str()))
        .collect::<Vec<_>>();

    Ok(HttpResponse::Ok().json(matching))
}

/// Return all registered products
#[utoipa::path(
    responses(
        (status = OK, description = "All products found", body = Vec<Product>),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
)]
#[get("/products_registered/")]
pub(crate) async fn products_registered(app: web::Data<App>) -> Result<impl Responder> {
    let all = Product::get_all(&app).await?;

    Ok(HttpResponse::Ok().json(all))
}

/// Return all products, which non-null amount in storage
#[utoipa::path(
    responses(
        (status = OK, description = "All products found", body = Vec<Product>),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
)]
#[get("/products_in_storage/")]
pub(crate) async fn products_in_storage(app: web::Data<App>) -> Result<impl Responder> {
    let all = Product::get_all(&app).await?;

    let mut output_products = Vec::with_capacity(all.len());
    for product in all {
        let amount = ProductAmount::from_id(&app, product.id).await?;

        if amount.is_some_and(|amount| amount.amount.value > 0) {
            output_products.push(product);
        }
    }

    Ok(HttpResponse::Ok().json(output_products))
}

/// Get Products by it's product parent id
///
/// This will also return all products below this product parent id
#[utoipa::path(
    responses(
        (status = OK, description = "Products found from database", body = Vec<Product>),
        (status = NOT_FOUND, description = "Product parent id not found in database"),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
    params(
        ("id" = ProductParentId, description = "Product parent id" ),
    )
)]
#[get("/product/by-product-parent-id-indirect/{id}")]
pub(crate) async fn products_by_product_parent_id_indirect(
    app: web::Data<App>,
    id: web::Path<ProductParentIdStub>,
) -> Result<impl Responder> {
    let id = id.into_inner();

    if let Some(parent) = ProductParent::from_id(&app, id.into()).await? {
        async fn collect_products(app: &App, parent: ProductParent) -> Result<Vec<Product>> {
            let mut all = Product::get_all(app)
                .await?
                .into_iter()
                .filter(|prod| prod.parent.is_some_and(|val| val == parent.id))
                .collect::<Vec<_>>();

            if let Some(child) = ProductParent::get_all(app)
                .await?
                .into_iter()
                .find(|pp| pp.parent.is_some_and(|id| id == parent.id))
            {
                all.extend(Box::pin(collect_products(app, child)).await?);
            }

            Ok(all)
        }

        let all = collect_products(&app, parent).await?;

        Ok(HttpResponse::Ok().json(all))
    } else {
        Ok(HttpResponse::NotFound().finish())
    }
}

/// Get Products by it's product parent id
///
/// This will only return products directly associated with this product parent id
#[utoipa::path(
    responses(
        (status = OK, description = "Products found from database", body = Vec<Product>),
        (status = NOT_FOUND, description = "Product parent id not found in database"),
        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
    ),
    params(
        ("id" = ProductParentId, description = "Product parent id" ),
    )
)]
#[get("/product/by-product-parent-id-direct/{id}")]
pub(crate) async fn products_by_product_parent_id_direct(
    app: web::Data<App>,
    id: web::Path<ProductParentIdStub>,
) -> Result<impl Responder> {
    let id = id.into_inner();

    if let Some(parent) = ProductParent::from_id(&app, id.into()).await? {
        let all = Product::get_all(&app)
            .await?
            .into_iter()
            .filter(|prod| prod.parent.is_some_and(|val| val == parent.id))
            .collect::<Vec<_>>();

        Ok(HttpResponse::Ok().json(all))
    } else {
        Ok(HttpResponse::NotFound().finish())
    }
}