/*
 * Copyright (C) Volition, Inc. 1999.  All rights reserved.
 *
 * All source code herein is the property of Volition, Inc. You may not sell 
 * or otherwise commercially exploit the source or things you created based on the 
 * source.
 *
*/

/**
 * @file 
 * The code in here is just for bookeeping, allocating AI slots and linking them to ships.
 * See AiCode.cpp for the actual AI code.
 */

#include "ai/ai.h"
#include "object/object.h"
#include "ship/ship.h"
#include "utils/string_utils.h"


// heap-allocated rather than SCP_string, so that the pointers held by ai goals stay valid when the vector grows
SCP_vector<SCP_vm_unique_ptr<char>> Goal_target_names;
ai_info Ai_info[MAX_AI_INFO];
ai_info *Player_ai;

/**
 * @brief Returns index of free AI slot.
 * @return Return -1 if no free slot.
 */
int ai_get_slot(int shipnum)
{
	int	i;

	for (i=0; i<MAX_AI_INFO ; i++)
		if (Ai_info[i].shipnum == -1)	{
			Ai_info[i].shipnum = shipnum;
			return i;
		}

	Error( LOCATION, "Couldn't get AI slot, please tell a coder!");

	return -1;
}

/**
 * @brief Frees a currently used AI slot.
 * @details Only modifies in ::Ai_info struct. Does not modify hook in ship.
 */
void ai_free_slot(int ai_index)
{
	Assert( (ai_index >= 0) && (ai_index < MAX_AI_INFO) );

	Ai_info[ai_index].shipnum = -1;
}

const char *ai_get_goal_target_name(const char *name, int *index)
{
	Assertion(name != nullptr && index != nullptr, "Arguments cannot be null!");

	for (int i = 0; i < static_cast<int>(Goal_target_names.size()); ++i) {
		if (!stricmp(name, Goal_target_names[i].get())) {
			*index = i;
			return Goal_target_names[i].get();
		}
	}

	*index = static_cast<int>(Goal_target_names.size());
	Goal_target_names.push_back(util::vm_unique_copy(name, false));
	return Goal_target_names.back().get();
}