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use core::file;
use futures::prelude::*;
use http::response::Parts;
use hyper::{
	self,
	header::{HeaderMap, HeaderValue, CONTENT_LENGTH, CONTENT_TYPE, LOCATION},
	Body,
	StatusCode,
	Version,
};
use mime_guess::guess_mime_type;
use std::{fmt::Debug, path::Path};
use tokio::{fs::File, io::ErrorKind};

#[derive(Debug)]
pub struct Response {
	pub(crate) parts: Parts,
	pub(crate) body: Body,
}

impl Response {
	pub fn new() -> Self {
		Response::default()
	}

	/// Get the HTTP version of this response.
	#[inline]
	pub fn version(&self) -> Version {
		self.parts.version
	}

	/// Get the headers from the response.
	#[inline]
	pub fn headers(&self) -> &HeaderMap<HeaderValue> {
		&self.parts.headers
	}

	/// Get a mutable reference to the headers.
	#[inline]
	pub fn headers_mut(&mut self) -> &mut HeaderMap<HeaderValue> {
		&mut self.parts.headers
	}

	/// Get the status from the server.
	#[inline]
	pub fn status(&self) -> StatusCode {
		self.parts.status
	}

	pub fn status_mut(&mut self) -> &mut StatusCode {
		&mut self.parts.status
	}

	/// Set the `StatusCode` for this response.
	///
	/// # Example
	///
	/// ```rust, ignore
	/// pub fn get_profile(req: Request, res: Response) {
	/// 	// performed task on request
	///
	/// 	// return an 401 response
	/// 	res.set_status(401);
	/// }
	/// ```
	///
	#[inline]
	pub fn set_status(&mut self, status: u16) {
		self.parts.status = StatusCode::from_u16(status).unwrap();
	}

	/// Set the status and move the Response.
	///
	/// Useful for the "builder-style" pattern.
	#[inline]
	pub fn with_status(mut self, status: u16) -> Self {
		self.parts.status = StatusCode::from_u16(status).unwrap();
		self
	}

	/// Set a text/plain response.
	#[inline]
	pub fn text<T: Into<String>>(&mut self, body: T) {
		let body = body.into();
		self.headers_mut().insert(
			CONTENT_LENGTH,
			HeaderValue::from_str(&body.len().to_string()).unwrap(),
		);
		self.body = Body::from(body);
	}

	/// set a text/plain response
	/// moves the response
	///
	/// useful for builder-style
	#[inline]
	pub fn with_text<T: Into<String>>(mut self, body: T) -> Self {
		self.text(body);

		self
	}

	/// get a reference to a type previously set on the response
	pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T> {
		self.parts.extensions.get::<T>()
	}

	/// Set a type on the response.
	pub fn set<T: Send + Sync + 'static>(&mut self, value: T) -> Option<T> {
		self.parts.extensions.insert::<T>(value)
	}

	/// Removes the type previously set on the response.
	pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T> {
		self.parts.extensions.remove::<T>()
	}

	/// Respond with a file.
	/// this method will set the appropriate Content-type and Content-Length
	/// headers unfortunately, this doesn't support byte ranges, yet.
	/// The file is streamed asynchronously from the filesystem to the client
	/// with the Content-Encoding: chunked.
	pub fn with_file<P>(mut self, pathbuf: P) -> impl Future<Item = Response, Error = Response>
	where
		P: AsRef<Path> + Send + Clone + Debug + 'static,
	{
		let path_clone = pathbuf.clone();

		File::open(pathbuf)
			.and_then(file::metadata)
			.then(move |result| {
				match result {
					Ok((file, meta)) => {
						let mime_type = guess_mime_type(path_clone.clone());
						self.headers_mut().insert(
							CONTENT_LENGTH,
							HeaderValue::from_str(&meta.len().to_string()).unwrap(),
						);
						self.headers_mut().insert(
							CONTENT_TYPE,
							HeaderValue::from_str(mime_type.as_ref()).unwrap(),
						);

						self.body = Body::wrap_stream(file::stream(file));

						Ok(self)
					}
					Err(err) => {
						error!("Error responding with a file: {}", err);
						match err.kind() {
							ErrorKind::NotFound => self.set_status(404),
							_ => self.set_status(500),
						};
						Err(self)
					}
				}
			})
	}

	/// Set the body and move the Response.
	///
	/// Useful for the "builder-style" pattern.
	#[inline]
	pub fn with_body<T: Into<Body>>(mut self, body: T) -> Self {
		self.body = body.into();
		self
	}

	#[inline]
	pub fn set_body<T: Into<Body>>(&mut self, body: T) {
		self.body = body.into();
	}

	/// Read the body.
	#[inline]
	pub fn body_ref(&self) -> &Body {
		&self.body
	}

	/// Take the `Body` of this response.
	#[inline]
	pub fn body(self) -> Body {
		self.body
	}

	/// Set a HTTP redirect on the response header
	pub fn redirect(mut self, url: &'static str) -> Response {
		self.set_status(301);
		self.headers_mut()
			.insert(LOCATION, HeaderValue::from_static(url));

		self
	}

	/// Set the status code 401 on the response
	pub fn unauthorized(self) -> Self {
		self.with_status(401)
	}

	/// Set the status code 400 on the response
	pub fn badRequest(self) -> Self {
		self.with_status(400)
	}

	/// Set the status code 403 on the response
	pub fn forbidden(self) -> Self {
		self.with_status(403)
	}

	/// Set the status code 405 on the response
	pub fn methodNotAllowed(self) -> Self {
		self.with_status(405)
	}

	/// Set the status code 406 on the response
	pub fn notAcceptable(self) -> Self {
		self.with_status(406)
	}

	/// Set the status code 408 on the response
	pub fn requestTimeout(self) -> Self {
		self.with_status(408)
	}

	/// Set the status code 500 on the response
	pub fn internalServerError(self) -> Self {
		self.with_status(500)
	}

	/// Set the status code 502 on the response
	pub fn badGateway(self) -> Self {
		self.with_status(502)
	}

	/// Set the status code 503 on the response
	pub fn serviceUnavailable(self) -> Self {
		self.with_status(503)
	}
}

impl Default for Response {
	fn default() -> Response {
		let (parts, body) = hyper::Response::new(Body::empty()).into_parts();
		Response { parts, body }
	}
}

pub fn res() -> Response {
	Response::default()
}