/*
 * "Software pw3270, desenvolvido com base nos códigos fontes do WC3270  e X3270
 * (Paul Mattes Paul.Mattes@usa.net), de emulação de terminal 3270 para acesso a
 * aplicativos mainframe. Registro no INPI sob o nome G3270. Registro no INPI sob o nome G3270.
 *
 * Copyright (C) <2008> <Banco do Brasil S.A.>
 *
 * Este programa é software livre. Você pode redistribuí-lo e/ou modificá-lo sob
 * os termos da GPL v.2 - Licença Pública Geral  GNU,  conforme  publicado  pela
 * Free Software Foundation.
 *
 * Este programa é distribuído na expectativa de  ser  útil,  mas  SEM  QUALQUER
 * GARANTIA; sem mesmo a garantia implícita de COMERCIALIZAÇÃO ou  de  ADEQUAÇÃO
 * A QUALQUER PROPÓSITO EM PARTICULAR. Consulte a Licença Pública Geral GNU para
 * obter mais detalhes.
 *
 * Você deve ter recebido uma cópia da Licença Pública Geral GNU junto com este
 * programa; se não, escreva para a Free Software Foundation, Inc., 51 Franklin
 * St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Este programa está nomeado como session.c e possui - linhas de código.
 *
 * Contatos:
 *
 * perry.werneck@gmail.com	(Alexandre Perry de Souza Werneck)
 * erico.mendonca@gmail.com	(Erico Mascarenhas Mendonça)
 * licinio@bb.com.br		(Licínio Luis Branco)
 * kraucer@bb.com.br		(Kraucer Fernandes Mazuco)
 *
 */

#ifndef ANDROID
	#include <stdlib.h>
#endif // !ANDROID

#include <lib3270-internals.h>
#include "kybdc.h"
#include "ansic.h"
#include "togglesc.h"
#include "screen.h"
#include "screenc.h"
#include "ctlrc.h"
#include "ftc.h"
#include "kybdc.h"
#include "3270ds.h"
#include "popupsc.h"
#include <lib3270/trace.h>
#include <lib3270/log.h>


/*---[ Globals ]--------------------------------------------------------------------------------------------------------------*/

 static H3270 *default_session = NULL;

/*---[ Statics ]--------------------------------------------------------------------------------------------------------------*/

/*---[ Implement ]------------------------------------------------------------------------------------------------------------*/

/**
 * @brief Closes a TN3270 session releasing resources.
 *
 * @param h handle of the session to close.
 *
 */
void lib3270_session_free(H3270 *h)
{
	size_t f;

	if(!h)
		return;

	// Terminate session
	if(lib3270_is_connected(h))
		lib3270_disconnect(h);

	shutdown_toggles(h);

#ifdef SSL_ENABLE_CRL_CHECK
	if(h->ssl.crl.url)
	{
		free(h->ssl.crl.url);
		h->ssl.crl.url = NULL;
	}

	if(h->ssl.crl.prefer)
	{
		free(h->ssl.crl.prefer);
		h->ssl.crl.prefer = NULL;
	}

	if(h->ssl.crl.cert)
	{
		X509_CRL_free(h->ssl.crl.cert);
		h->ssl.crl.cert = NULL;
	}
#endif // SSL_ENABLE_CRL_CHECK

	// Release state change callbacks
	for(f=0;f<LIB3270_STATE_USER;f++)
		lib3270_linked_list_free(&h->listeners.state[f]);


	// Release toggle change listeners.
	for(f=0;f<LIB3270_TOGGLE_COUNT;f++)
		lib3270_linked_list_free(&h->listeners.toggle[f]);

	// Release memory
	#define release_pointer(x) lib3270_free(x); x = NULL;

	// release_pointer(h->charset.display);
	release_pointer(h->paste_buffer);

	release_pointer(h->ibuf);
	h->ibuf_size = 0;

	for(f=0;f<(sizeof(h->buffer)/sizeof(h->buffer[0]));f++)
	{
		release_pointer(h->buffer[f]);
	}

	if(h == default_session)
		default_session = NULL;

	// Release hostname info
	release_pointer(h->host.current);
	release_pointer(h->host.full);
	release_pointer(h->host.srvc);
	release_pointer(h->host.qualified);

	release_pointer(h->charset.host);
	release_pointer(h->charset.display);

	release_pointer(h->text);
	release_pointer(h->zero_buf);

	release_pointer(h->output.base);

	release_pointer(h->sbbuf);
	release_pointer(h->tabs);

	// Release timeouts
	lib3270_linked_list_free(&h->timeouts);

	// Release inputs;
	lib3270_linked_list_free(&h->input.list);

	trace("Releasing session %p",h);
	lib3270_free(h);

}

static void update_char(H3270 GNUC_UNUSED(*session), int GNUC_UNUSED(addr), unsigned char GNUC_UNUSED(chr), unsigned short GNUC_UNUSED(attr), unsigned char GNUC_UNUSED(cursor))
{
}

static void nop_char(H3270 GNUC_UNUSED(*session), unsigned char GNUC_UNUSED(chr))
{
}

static void nop(H3270 GNUC_UNUSED(*session))
{
}

static void update_model(H3270 GNUC_UNUSED(*session), const char GNUC_UNUSED(*name), int GNUC_UNUSED(model), int GNUC_UNUSED(rows), int GNUC_UNUSED(cols))
{
}

static void changed(H3270 GNUC_UNUSED(*session), int GNUC_UNUSED(bstart), int GNUC_UNUSED(bend))
{
}

static void update_cursor(H3270 GNUC_UNUSED(*session), unsigned short GNUC_UNUSED(row), unsigned short GNUC_UNUSED(col), unsigned char GNUC_UNUSED(c), unsigned short GNUC_UNUSED(attr))
{
}

static void update_oia(H3270 GNUC_UNUSED(*session), LIB3270_FLAG GNUC_UNUSED(id), unsigned char GNUC_UNUSED(on))
{
}

static void update_selection(H3270 GNUC_UNUSED(*session), int GNUC_UNUSED(start), int GNUC_UNUSED(end))
{
}

static void set_cursor(H3270 GNUC_UNUSED(*session), LIB3270_POINTER GNUC_UNUSED(id))
{
}

static int print(H3270 *session, LIB3270_CONTENT_OPTION GNUC_UNUSED(mode))
{
	lib3270_write_log(session, "print", "%s", "Printing is unavailable");
	lib3270_popup_dialog(session, LIB3270_NOTIFY_WARNING, _( "Can't print" ), _( "Unable to print" ), "%s", strerror(ENOTSUP));
	return errno = ENOTSUP;
}

static int save(H3270 *session, LIB3270_CONTENT_OPTION GNUC_UNUSED(mode), const char GNUC_UNUSED(*filename))
{
	lib3270_write_log(session, "save", "%s", "Saving is unavailable");
	lib3270_popup_dialog(session, LIB3270_NOTIFY_WARNING, _( "Can't save" ), _( "Unable to save" ), "%s", strerror(ENOTSUP));
	return errno = ENOTSUP;
}

static int load(H3270 *session, const char GNUC_UNUSED(*filename))
{
	lib3270_write_log(session, "load", "%s", "Loading from file is unavailable");
	lib3270_popup_dialog(session, LIB3270_NOTIFY_WARNING, _( "Can't load" ), _( "Unable to load from file" ), "%s", strerror(ENOTSUP));
	return errno = ENOTSUP;
}

static void message(H3270 *session, LIB3270_NOTIFY GNUC_UNUSED(id), const char *title, const char *msg, const char *text)
{
#ifdef ANDROID
	__android_log_print(ANDROID_LOG_VERBOSE, PACKAGE_NAME, "%s\n",title);
	__android_log_print(ANDROID_LOG_VERBOSE, PACKAGE_NAME, "%s\n",msg);
	__android_log_print(ANDROID_LOG_VERBOSE, PACKAGE_NAME, "%s\n",text);
#else
	lib3270_write_log(session,"lib3270","%s",title);
	lib3270_write_log(session,"lib3270","%s",msg);
	lib3270_write_log(session,"lib3270","%s",text);
#endif // ANDROID
}

static void def_popup(H3270 *session, LIB3270_NOTIFY GNUC_UNUSED(type), const char *title, const char *msg, const char *fmt, va_list arg)
{
#ifdef ANDROID
	char *mask = xs_buffer("%s\n",fmt);
	__android_log_vprint(ANDROID_LOG_VERBOSE, PACKAGE_NAME, mask, arg);
	lib3270_free(mask);
#else
	lib3270_write_log(session,"popup","%s",title);
	lib3270_write_log(session,"popup","%s",msg);
	lib3270_write_va_log(session,"popup",fmt,arg);
#endif // ANDROID
}

static int def_popup_ssl_error(H3270 *session, int GNUC_UNUSED(rc), const char *title, const char *summary, const char *body)
{
	lib3270_popup_dialog(session, LIB3270_NOTIFY_ERROR, title, summary, "%s", body);
    return -1;
}

static void def_trace(H3270 GNUC_UNUSED(*session), void GNUC_UNUSED(*userdata), const char *fmt, va_list args)
{
	vfprintf(stdout,fmt,args);
	fflush(stdout);
}

static void update_ssl(H3270 GNUC_UNUSED(*session), LIB3270_SSL_STATE GNUC_UNUSED(state))
{
}

static void set_timer(H3270 GNUC_UNUSED(*session), unsigned char GNUC_UNUSED(on))
{
}

static void screen_disp(H3270 *session)
{
	CHECK_SESSION_HANDLE(session);
	screen_update(session,0,session->view.rows*session->view.cols);
}

static void nop_int(H3270 GNUC_UNUSED(*session), int GNUC_UNUSED(width))
{
	return;
}

#ifdef HAVE_LIBSSL
static void set_peer_certificate(const X509 GNUC_UNUSED(*cert))
{

}
#else
static void set_peer_certificate(const void GNUC_UNUSED(*cert))
{

}
#endif // HAVE_LIBSSL

static void default_update_luname(H3270 GNUC_UNUSED(*session), const char GNUC_UNUSED(*name))
{
}

void lib3270_reset_callbacks(H3270 *hSession)
{
	// Default calls
	memset(&hSession->cbk,0,sizeof(hSession->cbk));

	hSession->cbk.write					= lib3270_sock_send;
	hSession->cbk.disconnect			= lib3270_sock_disconnect;
	hSession->cbk.update 				= update_char;
	hSession->cbk.update_model			= update_model;
	hSession->cbk.update_cursor			= update_cursor;
	hSession->cbk.set_selection 		= nop_char;
	hSession->cbk.ctlr_done				= nop;
	hSession->cbk.changed				= changed;
	hSession->cbk.erase					= screen_disp;
	hSession->cbk.suspend				= nop;
	hSession->cbk.resume				= screen_disp;
	hSession->cbk.update_oia			= update_oia;
	hSession->cbk.update_selection		= update_selection;
	hSession->cbk.cursor 				= set_cursor;
	hSession->cbk.message				= message;
	hSession->cbk.popup					= def_popup;
	hSession->cbk.popup_ssl_error		= def_popup_ssl_error;
	hSession->cbk.update_ssl			= update_ssl;
	hSession->cbk.display				= screen_disp;
	hSession->cbk.set_width				= nop_int;
	hSession->cbk.update_status			= (void (*)(H3270 *, LIB3270_MESSAGE)) nop_int;
	hSession->cbk.autostart				= nop;
	hSession->cbk.set_timer				= set_timer;
	hSession->cbk.print					= print;
	hSession->cbk.save					= save;
	hSession->cbk.load					= load;
	hSession->cbk.set_peer_certificate	= set_peer_certificate;
	hSession->cbk.update_luname			= default_update_luname;
}

static void lib3270_session_init(H3270 *hSession, const char *model, const char *charset)
{
	int		f;

	memset(hSession,0,sizeof(H3270));
//	hSession->sz = sizeof(H3270);

	lib3270_set_host_charset(hSession,charset);
	lib3270_reset_callbacks(hSession);

	// Trace management.
	hSession->trace.handler			= def_trace;

	// Set the defaults.
	hSession->extended  			=  1;
	hSession->typeahead				=  1;
	hSession->oerr_lock 			=  1;
	hSession->unlock_delay			=  1;
	hSession->icrnl 				=  1;
	hSession->onlcr					=  1;
	hSession->sock					= -1;
	hSession->model_num				= -1;
	hSession->cstate				= LIB3270_NOT_CONNECTED;
	hSession->oia.status			= -1;
	hSession->kybdlock 				= KL_NOT_CONNECTED;
	hSession->aid 					= AID_NO;
	hSession->reply_mode 			= SF_SRM_FIELD;
	hSession->linemode				= 1;
	hSession->tn3270e_submode		= E_NONE;
	hSession->scroll_top 			= -1;
	hSession->scroll_bottom			= -1;
	hSession->wraparound_mode 		= 1;
	hSession->saved_wraparound_mode	= 1;
	hSession->once_cset 			= -1;
	hSession->state					= LIB3270_ANSI_STATE_DATA;
	hSession->host_type				= LIB3270_HOSTTYPE_DEFAULT;
	hSession->colors				= 16;
	hSession->m3279					= 1;
	hSession->pointer				= (unsigned short) LIB3270_POINTER_LOCKED;

#ifdef UNLOCK_MS
	hSession->unlock_delay_ms		= UNLOCK_MS;
#else
	hSession->unlock_delay_ms		= 350;
#endif // UNLOCK_MS

	// CSD
	for(f=0;f<4;f++)
		hSession->csd[f] = hSession->saved_csd[f] = LIB3270_ANSI_CSD_US;

	// Initialize toggles
	initialize_toggles(hSession);

	lib3270_set_model(hSession,model);

}

LIB3270_EXPORT void lib3270_set_trace_handler(H3270 *hSession, LIB3270_TRACE_HANDLER handler, void *userdata)
{
	CHECK_SESSION_HANDLE(hSession);

	hSession->trace.handler		= handler ? handler : def_trace;
	hSession->trace.userdata	= userdata;
}

LIB3270_EXPORT void lib3270_get_trace_handler(H3270 *hSession, LIB3270_TRACE_HANDLER *handler, void **userdata)
{
	CHECK_SESSION_HANDLE(hSession);

	*handler	= hSession->trace.handler;
	*userdata	= hSession->trace.userdata;

}

LIB3270_EXPORT void lib3270_set_popup_handler(H3270 *session, void (*handler)(H3270 *, LIB3270_NOTIFY, const char *, const char *, const char *, va_list)) {
	session->cbk.popup = handler ? handler : def_popup;
}

H3270 * lib3270_session_new(const char *model)
{
	H3270 * hSession;

	trace("%s - configured=%s",__FUNCTION__,default_session ? "Yes" : "No");

	hSession = lib3270_malloc(sizeof(H3270));
	hSession->id = 0;

	if(!default_session)
		default_session = hSession;

	lib3270_session_init(hSession, model, _( "bracket" ) );

	if(screen_init(hSession))
		return NULL;

	trace("%s: Initializing KYBD",__FUNCTION__);
	lib3270_register_schange(hSession,LIB3270_STATE_CONNECT,kybd_connect,NULL);
	lib3270_register_schange(hSession,LIB3270_STATE_3270_MODE,kybd_in3270,NULL);

#if defined(X3270_ANSI)
	trace("%s: Initializing ANSI",__FUNCTION__);
	lib3270_register_schange(hSession,LIB3270_STATE_3270_MODE,ansi_in3270,NULL);
#endif // X3270_ANSI


#if defined(X3270_FT)
	ft_init(hSession);
#endif

	trace("%s finished",__FUNCTION__);

	errno = 0;
	return hSession;
}

#if defined(DEBUG)
void check_session_handle(H3270 **hSession, const char *fname)
#else
void check_session_handle(H3270 **hSession)
#endif // DEBUG
{
	if(*hSession)
		return;

	*hSession = lib3270_get_default_session_handle();

#if defined(ANDROID)
	__android_log_print(ANDROID_LOG_VERBOSE, PACKAGE_NAME, "%s called with empty session\n", __FUNCTION__);
#elif defined(DEBUG)
	lib3270_write_log(*hSession, "lib3270", "%s called with empty session from %s",__FUNCTION__,fname);
#else
	lib3270_write_log(*hSession, "lib3270", "%s called with empty session",__FUNCTION__);
#endif // ANDROID
}

LIB3270_INTERNAL int check_online_session(const H3270 *hSession) {

	// Is the session valid?
	if(!hSession)
		return errno = EINVAL;

	// Is it connected?
	if((int) hSession->cstate < (int)LIB3270_CONNECTED_INITIAL)
		return errno = ENOTCONN;

	return 0;
}

LIB3270_INTERNAL int check_offline_session(const H3270 *hSession) {

	// Is the session valid?
	if(!hSession)
		return errno = EINVAL;

	// Is it connected?
	if((int) hSession->cstate >= (int)LIB3270_CONNECTED_INITIAL)
		return errno = EISCONN;

	return 0;
}

LIB3270_EXPORT H3270 * lib3270_get_default_session_handle(void)
{
	if(default_session)
		return default_session;

	return lib3270_session_new("");
}

LIB3270_EXPORT void lib3270_set_user_data(H3270 *h, void *ptr)
{
	CHECK_SESSION_HANDLE(h);
	h->user_data = ptr;
}

LIB3270_EXPORT void * lib3270_get_user_data(H3270 *h)
{
	CHECK_SESSION_HANDLE(h);
	return h->user_data;
}

LIB3270_EXPORT void lib3270_set_session_id(H3270 *hSession, char id)
{
	CHECK_SESSION_HANDLE(hSession);
	hSession->id = id;
}

LIB3270_EXPORT char lib3270_get_session_id(H3270 *hSession)
{
	CHECK_SESSION_HANDLE(hSession);
	return hSession->id;
}

struct lib3270_session_callbacks * lib3270_get_session_callbacks(H3270 *session, unsigned short sz)
{
	CHECK_SESSION_HANDLE(session);

	if(sz != sizeof(struct lib3270_session_callbacks))
		return NULL;

	return &session->cbk;
}