/*
 * Copyright (C) 2011-2014 Andreas Steffen
 * HSR Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include "imc_test_state.h"

#include <tncif_names.h>

#include <utils/debug.h>
#include <collections/linked_list.h>

typedef struct private_imc_test_state_t private_imc_test_state_t;
typedef struct entry_t entry_t;

/**
 * Private data of an imc_test_state_t object.
 */
struct private_imc_test_state_t {

	/**
	 * Public members of imc_test_state_t
	 */
	imc_test_state_t public;

	/**
	 * TNCCS connection ID
	 */
	TNC_ConnectionID connection_id;

	/**
	 * TNCCS connection state
	 */
	TNC_ConnectionState state;

	/**
	 * Assessment/Evaluation Results for all IMC IDs
	 */
	linked_list_t *results;

	/**
	 * Does the TNCCS connection support long message types?
	 */
	bool has_long;

	/**
	 * Does the TNCCS connection support exclusive delivery?
	 */
	bool has_excl;

	/**
	 * Maximum PA-TNC message size for this TNCCS connection
	 */
	uint32_t max_msg_len;

	/**
	 * PA-TNC attribute segmentation contracts associated with TNCCS connection
	 */
	seg_contract_manager_t *contracts;

	/**
	 * Command to transmit to IMV
	 */
	char *command;

	/**
	 * Size of the dummy attribute value to transmit to IMV
	 */
	int dummy_size;

	/**
	 * Is it the first handshake?
	 */
	bool first_handshake;

	/**
	 * Do a handshake retry
	 */
	bool handshake_retry;

};

/**
 * Stores the Assessment/Evaluation Result for a given IMC ID
 */
struct entry_t {
	TNC_IMCID id;
	TNC_IMV_Evaluation_Result result;
};

METHOD(imc_state_t, get_connection_id, TNC_ConnectionID,
	private_imc_test_state_t *this)
{
	return this->connection_id;
}

METHOD(imc_state_t, has_long, bool,
	private_imc_test_state_t *this)
{
	return this->has_long;
}

METHOD(imc_state_t, has_excl, bool,
	private_imc_test_state_t *this)
{
	return this->has_excl;
}

METHOD(imc_state_t, set_flags, void,
	private_imc_test_state_t *this, bool has_long, bool has_excl)
{
	this->has_long = has_long;
	this->has_excl = has_excl;
}

METHOD(imc_state_t, set_max_msg_len, void,
	private_imc_test_state_t *this, uint32_t max_msg_len)
{
	this->max_msg_len = max_msg_len;
}

METHOD(imc_state_t, get_max_msg_len, uint32_t,
	private_imc_test_state_t *this)
{
	return this->max_msg_len;
}

METHOD(imc_state_t, get_contracts, seg_contract_manager_t*,
	private_imc_test_state_t *this)
{
	return this->contracts;
}

METHOD(imc_state_t, change_state, TNC_ConnectionState,
	private_imc_test_state_t *this, TNC_ConnectionState new_state)
{
	TNC_ConnectionState old_state;

	old_state = this->state;
	this->state = new_state;
	return old_state;
}

METHOD(imc_state_t, set_result, void,
	private_imc_test_state_t *this, TNC_IMCID id,
	TNC_IMV_Evaluation_Result result)
{
	enumerator_t *enumerator;
	entry_t *entry;
	bool found = FALSE;

	enumerator = this->results->create_enumerator(this->results);
	while (enumerator->enumerate(enumerator, &entry))
	{
		if (entry->id == id)
		{
			entry->result = result;
			found = TRUE;
			break;
		}
	}
	enumerator->destroy(enumerator);

	if (!found)
	{
		entry = malloc_thing(entry_t);
		entry->id = id;
		entry->result = result;
		this->results->insert_last(this->results, entry);
	}
}

METHOD(imc_state_t, get_result, bool,
	private_imc_test_state_t *this, TNC_IMCID id,
	TNC_IMV_Evaluation_Result *result)
{
	enumerator_t *enumerator;
	entry_t *entry;
	TNC_IMV_Evaluation_Result eval = TNC_IMV_EVALUATION_RESULT_DONT_KNOW;

	enumerator = this->results->create_enumerator(this->results);
	while (enumerator->enumerate(enumerator, &entry))
	{
		if (entry->id == id)
		{
			eval = entry->result;
			break;
		}
	}
	enumerator->destroy(enumerator);

	if (result)
	{
		*result = eval;
	}
	return eval != TNC_IMV_EVALUATION_RESULT_DONT_KNOW;
}

METHOD(imc_state_t, reset, void,
	private_imc_test_state_t *this)
{
	/* nothing to reset */
}

METHOD(imc_state_t, destroy, void,
	private_imc_test_state_t *this)
{
	this->results->destroy_function(this->results, free);
	this->contracts->destroy(this->contracts);
	free(this->command);
	free(this);
}

METHOD(imc_test_state_t, get_command, char*,
	private_imc_test_state_t *this)
{
	return this->command;
}

METHOD(imc_test_state_t, set_command, void,
	private_imc_test_state_t *this, char* command)
{
	char *old_command;

	old_command = this->command;
	this->command = strdup(command);
	free(old_command);
}

METHOD(imc_test_state_t, get_dummy_size, int,
	private_imc_test_state_t *this)
{
	return this->dummy_size;
}


METHOD(imc_test_state_t, is_first_handshake, bool,
	private_imc_test_state_t *this)
{
	bool first;

	/* test and reset first_handshake flag */
	first= this->first_handshake;
	this->first_handshake = FALSE;
	return first;
}

METHOD(imc_test_state_t, do_handshake_retry, bool,
	private_imc_test_state_t *this)
{
	bool retry;

	/* test and reset handshake_retry flag */
	retry = this->handshake_retry;
	this->handshake_retry = FALSE;
	return retry;
}

/**
 * Described in header.
 */
imc_state_t *imc_test_state_create(TNC_ConnectionID connection_id,
								   char *command, int dummy_size, bool retry)
{
	private_imc_test_state_t *this;

	INIT(this,
		.public = {
			.interface = {
				.get_connection_id = _get_connection_id,
				.has_long = _has_long,
				.has_excl = _has_excl,
				.set_flags = _set_flags,
				.set_max_msg_len = _set_max_msg_len,
				.get_max_msg_len = _get_max_msg_len,
				.get_contracts = _get_contracts,
				.change_state = _change_state,
				.set_result = _set_result,
				.get_result = _get_result,
				.reset = _reset,
				.destroy = _destroy,
			},
			.get_command = _get_command,
			.set_command = _set_command,
			.get_dummy_size = _get_dummy_size,
			.is_first_handshake = _is_first_handshake,
			.do_handshake_retry = _do_handshake_retry,
		},
		.state = TNC_CONNECTION_STATE_CREATE,
		.results = linked_list_create(),
		.connection_id = connection_id,
		.contracts = seg_contract_manager_create(),
		.command = strdup(command),
		.dummy_size = dummy_size,
		.first_handshake = TRUE,
		.handshake_retry = retry,
	);

	return &this->public.interface;
}