use crate::{
	links::{next_name, next_url, previous_name, previous_url},
	responders::CorsResponse,
	sites::get_global_names,
};
use meowy_assets::{
	files::{get_file_wrapper, File},
	templates::{BaseTemplate, ErrorTemplate, IndexTemplate},
};
use rocket::{
	http::Status,
	response::Redirect,
	serde::{json::Json, Serialize},
};

fn get_file(filename: &str) -> Result<&File, Status> {
	let files = get_file_wrapper()?;

	match files.filename_get(filename) {
		Some(file) => Ok(file),
		None => Err(Status::NotFound),
	}
}

fn get_base_template() -> Result<BaseTemplate, Status> {
	let hyperlegible_filename = get_file("hyperlegible")?.metadata.get_hash_filename();
	let style_filename = get_file("style")?.metadata.get_hash_filename();

	let template = BaseTemplate {
		hyperlegible_filename,
		style_filename,
	};

	Ok(template)
}

fn not_found_error() -> Result<ErrorTemplate<'static>, Status> {
	let base_template = get_base_template()?;
	let template = ErrorTemplate {
		error: "Not Found",
		error_description: "this URL could not be found on the webring.",
		base_template,
	};
	Ok(template)
}

#[derive(Serialize)]
#[serde(crate = "rocket::serde")]
pub struct JsonResponse {
	previous_site_name: Option<String>,
	next_site_name: Option<String>,
}

#[get("/")]
pub async fn index() -> Result<IndexTemplate, Status> {
	let base_template = get_base_template()?;
	let template = IndexTemplate {
		sites: get_global_names().await,
		base_template,
	};
	Ok(template)
}

#[get("/previous?<source_url>")]
pub async fn previous(source_url: String) -> Result<Redirect, Status> {
	match previous_url(&source_url, &get_global_names().await) {
		Some(url) => Ok(Redirect::to(format!("https://{}", url))),
		None => Err(Status::NotFound),
	}
}

#[get("/next?<source_url>")]
pub async fn next(source_url: String) -> Result<Redirect, Status> {
	match next_url(&source_url, &get_global_names().await) {
		Some(url) => Ok(Redirect::to(format!("https://{}", url))),
		None => Err(Status::NotFound),
	}
}

#[get("/name?<source_url>")]
pub async fn name(source_url: String) -> Result<CorsResponse<Json<JsonResponse>>, Status> {
	let previous_site_name = previous_name(&source_url, &get_global_names().await);
	let next_site_name = next_name(&source_url, &get_global_names().await);

	if previous_site_name.is_none() && next_site_name.is_none() {
		return Err(Status::NotFound);
	}

	Ok(Json(JsonResponse {
		previous_site_name,
		next_site_name,
	})
	.into())
}

#[catch(404)]
pub fn not_found() -> Result<ErrorTemplate<'static>, Status> {
	not_found_error()
}