/*********************************************************/
/*  ptycon: a pty-console bridge                         */
/*  Copyright (C) 2016--2017  Z. Gilboa                  */
/*  Released under GPLv2 and GPLv3; see COPYING.PTYCON.  */
/*********************************************************/

#include <psxtypes/psxtypes.h>
#include <ntapi/ntapi.h>
#include <ntapi/nt_atomic.h>

#include <ptycon/ptycon.h>
#include "ptycon_daemon_impl.h"
#include "ptycon_driver_impl.h"

static const nt_guid ptyc_daemon_guid = PTYC_PORT_GUID_DAEMON;

static int32_t ptyc_daemon_init_impl(struct ptyc_daemon_ctx * dctx, void * htty)
{
	int32_t				status;
	nt_daemon_params		dparams;
	wchar16_t *			port_name;
	nt_port_name_keys *		port_name_keys;

	/* daemon attributes */
	dctx->daemon_attr.type    = NT_PORT_TYPE_DAEMON;
	dctx->daemon_attr.subtype = NT_PORT_SUBTYPE_DEFAULT;

	/* port guid */
	ntapi->tt_guid_copy(
		&dctx->daemon_attr.guid,
		&ptyc_daemon_guid);

	/* port keys */
	if ((status = ntapi->tt_port_generate_keys(&dctx->daemon_attr.keys)))
		return status;

	/* port name */
	ntapi->tt_port_name_from_attributes(
		&dctx->daemon_name,
		&dctx->daemon_attr);

	/* dparams */
	ntapi->tt_aligned_block_memset(
		&dparams,0,sizeof(dparams));

	port_name      = (wchar16_t *)&dctx->daemon_name;
	port_name_keys = (nt_port_name_keys *)&dctx->daemon_name.port_name_keys;

	dparams.port_keys	= &dctx->daemon_keys;
	dparams.port_name	= port_name;
	dparams.port_name_keys	= port_name_keys;

	dparams.port_msg_size	= sizeof(nt_tty_port_msg);
	dparams.flags		= NT_DSR_INIT_DEFAULT;

	dparams.daemon_once_routine	= 0;
	dparams.daemon_loop_routine	= ptyc_daemon_loop;
	dparams.daemon_loop_context	= dctx;

	dparams.pport_daemon		= &dctx->hport_daemon;
	dparams.pport_internal_client	= &dctx->hport_internal_client;

	dparams.pevent_daemon_ready		= &dctx->hevent_daemon_ready;
	dparams.pevent_internal_client_ready	= &dctx->hevent_internal_client_ready;

	dparams.stack_size_commit		= 8192;
	dparams.stack_size_reserve		= 8192;

	if ((status = ntapi->dsr_init(&dparams)))
		return status;

	return ntapi->tty_request_peer(
                htty,
		PTYC_DAEMON_TTYSIGNAL,
		0,&(nt_guid)TTY_PTS_GUID,
		&dctx->daemon_attr);
}

static int32_t ptyc_daemon_once = 0;

int32_t __stdcall ptyc_daemon_init(struct ptyc_daemon_ctx * dctx, uint64_t drvflags)
{
	int32_t			status;
	nt_timeout		timeout;
	nt_runtime_data *	rtdata;

	/* rtdata */
	if ((status = ntapi->tt_get_runtime_data(&rtdata,0)))
		return status;

	/* needed? */
	if (drvflags & PTYC_DRIVER_DAEMON_NEVER)
		return 0;

	if (!(drvflags & PTYC_DRIVER_DAEMON_ALWAYS))
		if (ntapi->tt_guid_compare(&rtdata->srv_guid,&ptyc_daemon_guid))
			return 0;

	/* once */
	switch (at_locked_cas_32(&ptyc_daemon_once,0,1)) {
		case 0:
			if ((status = ptyc_daemon_init_impl(dctx,rtdata->hsession))) {
				at_locked_add_32(&ptyc_daemon_once,2);
				return status;
			}

			at_locked_inc_32(&ptyc_daemon_once);
			return 0;

		case 1:
			timeout.quad = -10;

			for (; (at_locked_cas_32(&ptyc_daemon_once,0,1) == 1); )
				ntapi->zw_delay_execution(
					NT_SYNC_ALERTABLE,
					&timeout);

			return (ptyc_daemon_once == 2)
				? 0 : -1;

		case 2:
			return 0;

		case 3:
		default:
			return -1;
	}
}