#![forbid(unsafe_code)]
#![warn(clippy::todo)]

/// Database abstraction layer for Kittybox, allowing the CMS to work with any kind of database.
pub mod database;
pub mod frontend;
pub mod media;
pub mod micropub;
pub mod indieauth;

pub mod companion {
    use std::{collections::HashMap, sync::Arc};
    use axum::{
        extract::{Extension, Path},
        response::{IntoResponse, Response}
    };

    #[derive(Debug, Clone, Copy)]
    struct Resource {
        data: &'static [u8],
        mime: &'static str
    }

    impl IntoResponse for &Resource {
        fn into_response(self) -> Response {
            (axum::http::StatusCode::OK,
             [("Content-Type", self.mime)],
             self.data).into_response()
        }
    }

    // TODO replace with the "phf" crate someday
    type ResourceTable = Arc<HashMap<&'static str, Resource>>;

    #[tracing::instrument]
    async fn map_to_static(
        Path(name): Path<String>,
        Extension(resources): Extension<ResourceTable>
    ) -> Response {
        tracing::debug!("Searching for {} in the resource table...", name);
        match resources.get(name.as_str()) {
            Some(res) => res.into_response(),
            None => {
                #[cfg(debug_assertions)] tracing::error!("Not found");

                (axum::http::StatusCode::NOT_FOUND,
                 [("Content-Type", "text/plain")],
                 "Not found. Sorry.".as_bytes()).into_response()
            }
        }
    }

    pub fn router() -> axum::Router {
        let resources: ResourceTable = {
            let mut map = HashMap::new();

            macro_rules! register_resource {
                ($map:ident, $prefix:expr, ($filename:literal, $mime:literal)) => {{
                    $map.insert($filename, Resource {
                        data: include_bytes!(concat!($prefix, $filename)),
                        mime: $mime
                    })
                }};
                ($map:ident, $prefix:expr, ($filename:literal, $mime:literal), $( ($f:literal, $m:literal) ),+) => {{
                    register_resource!($map, $prefix, ($filename, $mime));
                    register_resource!($map, $prefix, $(($f, $m)),+);
                }};
            }

            register_resource! {
                map,
                concat!(env!("OUT_DIR"), "/", "companion", "/"),
                ("index.html", "text/html; charset=\"utf-8\""),
                ("main.js", "text/javascript"),
                ("micropub_api.js", "text/javascript"),
                ("style.css", "text/css")
            };

            Arc::new(map)
        };

        axum::Router::new()
            .route(
                "/:filename",
                axum::routing::get(map_to_static)
                    .layer(Extension(resources))
            )
    }
}