use std::net::SocketAddr;
use std::sync::Arc;
use rpc_apis::{self, ApiSet};
use ethcore_rpc::{Server, start_http, MetaIoHandler, Compatibility, Remote};
use network::Network;
use std::io;
use sync;
use storage;
use p2p;

pub struct Dependencies {
	pub network: Network,
	pub local_sync_node: sync::LocalNodeRef,
	pub storage: storage::SharedStore,
	pub p2p_context: Arc<p2p::Context>,
	pub remote: Remote,
}

#[derive(Debug, PartialEq)]
pub struct HttpConfiguration {
	pub enabled: bool,
	pub interface: String,
	pub port: u16,
	pub apis: ApiSet,
	pub cors: Option<Vec<String>>,
	pub hosts: Option<Vec<String>>,
}

impl HttpConfiguration {
	pub fn with_port(port: u16) -> Self {
		HttpConfiguration {
			enabled: true,
			interface: "127.0.0.1".into(),
			port: port,
			apis: ApiSet::default(),
			cors: None,
			hosts: Some(Vec::new()),
		}
	}
}

pub fn new_http(conf: HttpConfiguration, deps: Dependencies) -> Result<Option<Server>, String> {
	if !conf.enabled {
		return Ok(None);
	}

	let url = format!("{}:{}", conf.interface, conf.port);
	let addr = try!(url.parse().map_err(|_| format!("Invalid JSONRPC listen host/port given: {}", url)));
	Ok(Some(try!(setup_http_rpc_server(&addr, conf.cors, conf.hosts, conf.apis, deps))))
}

pub fn setup_http_rpc_server(
	url: &SocketAddr,
	cors_domains: Option<Vec<String>>,
	allowed_hosts: Option<Vec<String>>,
	apis: ApiSet,
	deps: Dependencies,
) -> Result<Server, String> {
	let server = setup_rpc_server(apis, deps);
	let start_result = start_http(url, cors_domains, allowed_hosts, server);
	match start_result {
		Err(ref err) if err.kind() == io::ErrorKind::AddrInUse => {
			Err(format!("RPC address {} is already in use, make sure that another instance of a Bitcoin node is not running or change the address using the --jsonrpc-port and --jsonrpc-interface options.", url))
		},
		Err(e) => Err(format!("RPC error: {:?}", e)),
		Ok(server) => Ok(server),
	}
}

fn setup_rpc_server(apis: ApiSet, deps: Dependencies) -> MetaIoHandler<()> {
	rpc_apis::setup_rpc(MetaIoHandler::with_compatibility(Compatibility::Both), apis, deps)
}