/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * Additional copyright for this file:
 * Copyright (C) 1999-2000 Revolution Software Ltd.
 * This code is based on source code created by Revolution Software,
 * used with permission.
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "engines/icb/p4.h" //for machine version
#include "engines/icb/common/px_common.h"
#include "engines/icb/common/px_linkeddatafile.h"
#include "engines/icb/mission.h"
#include "engines/icb/session.h"
#include "engines/icb/object_structs.h"
#include "engines/icb/debug.h"
#include "engines/icb/player.h"
#include "engines/icb/direct_input.h"
#include "engines/icb/barriers.h"
#include "engines/icb/common/px_route_barriers.h"
#include "engines/icb/global_objects.h"
#include "engines/icb/animation_mega_set.h"
#include "engines/icb/mission.h"
#include "engines/icb/common/px_scriptengine.h"
#include "engines/icb/common/ptr_util.h"

namespace ICB {

mcodeFunctionReturnCodes fn_mega_interacts(int32 &result, int32 *params) { return (MS->fn_mega_interacts(result, params)); }

mcodeFunctionReturnCodes fn_mega_generic_interact(int32 &result, int32 *params) { return (MS->fn_mega_generic_interact(result, params)); }

mcodeFunctionReturnCodes fn_interact_with_id(int32 &result, int32 *params) { return (MS->fn_interact_with_id(result, params)); }

mcodeFunctionReturnCodes _game_session::fn_interact_with_id(int32 &, int32 *params) {
	// mega character interacts with an object via its id

	// do check to see if script running

	// if not set it up on level 2 and change script level

	// params        0   id of target object
	//				1  name of script
	const char *script_name = (const char *)MemoryUtil::resolvePtr(params[1]);
	CGame *target_object;
	uint32 script_hash;

	Zdebug("fn_interact_with_id with object");
	Zdebug("fn_interact_with_id with object [%d], script [%s]", params[0], script_name);

	script_hash = HashString(script_name);

	// get target object
	target_object = (CGame *)LinkedDataObject::Fetch_item_by_number(MS->objects, params[0]);

	// set socket_id ready for any special socket functions
	M->target_id = params[0];

	// set this flag to avoid interact with id=0 based problems
	M->interacting = TRUE8;

	// now try and find a script with the passed extension i.e. ???::looping
	for (uint32 k = 0; k < CGameObject::GetNoScripts(target_object); k++) {
		if (script_hash == CGameObject::GetScriptNamePartHash(target_object, k)) {
			Zdebug("found target interact script", k);
			// script k is the one to run
			// get the address of the script we want to run

			char *ad = (char *)LinkedDataObject::Try_fetch_item_by_hash(scripts, CGameObject::GetScriptNameFullHash(target_object, k));

			// write actual offset
			L->logic[2] = ad;

			// write reference for change script checks later - i.e. FN_context_chosen_script
			L->logic_ref[2] = ad;

			L->logic_level = 2; // reset to level 2
			// action script will fall back to looping level 1

			// script interpreter shouldn't write a pc back
			return (IR_GOSUB);
		}
	}

	Fatal_error("fn_interact_with_id - target object [%d] has not got a [%s] script", params[0], CGameObject::GetName(object));

	return (IR_STOP);
}

mcodeFunctionReturnCodes _game_session::fn_mega_interacts(int32 &, int32 *params) {
	// mega character interacts with an object

	// do check to see if script running

	// if not set it up on level 2 and change script level

	// params        0   name of target object
	//				1  name of script

	CGame *target_object;
	uint32 script_hash;

	const char *object_name = (const char *)MemoryUtil::resolvePtr(params[0]);
	const char *script_name = (const char *)MemoryUtil::resolvePtr(params[1]);

	script_hash = HashString(script_name);

	Zdebug("fn_mega_interacts with object [%s], script [%s]", object_name, script_name);

	// get target object
	target_object = (CGame *)LinkedDataObject::Try_fetch_item_by_name(MS->objects, object_name);
	if (!target_object)
		Fatal_error("fn_mega_interacts - named object [%s] don't exist", object_name);

	// set socket_id ready for any special socket functions
	M->target_id = LinkedDataObject::Fetch_item_number_by_name(objects, object_name);

	// set this flag to avoid interact with id=0 based problems
	M->interacting = TRUE8;

	// now try and find a script with the passed extension i.e. ???::looping
	for (uint32 k = 0; k < CGameObject::GetNoScripts(target_object); k++) {
		if (script_hash == CGameObject::GetScriptNamePartHash(target_object, k)) {
			Zdebug("found target interact script", k);
			// script k is the one to run
			// get the address of the script we want to run
			char *ad = (char *)LinkedDataObject::Try_fetch_item_by_hash(scripts, CGameObject::GetScriptNameFullHash(target_object, k));

			// write actual offset
			L->logic[2] = ad;

			// write reference for change script checks later - i.e. FN_context_chosen_script
			L->logic_ref[2] = ad;

			L->logic_level = 2; // reset to level 2
			// action script will fall back to looping level 1

			// script interpreter shouldn't write a pc back
			return (IR_GOSUB);
		}
	}

	Fatal_error("fn_mega_interacts - target object [%s] has not got a [%s] script", object_name, CGameObject::GetName(object));

	return (IR_STOP);
}

mcodeFunctionReturnCodes _game_session::fn_mega_generic_interact(int32 &, int32 *params) {
	// mega character interacts with an object using the INTERACT script that the player also uses

	// params    0   ascii name of object

	CGame *target_object;
	uint32 script_hash;
	const char *object_name = (const char *)MemoryUtil::resolvePtr(params[0]);

	script_hash = HashString("interact");

	Zdebug("fn_mega_generic_interact with [%s]", object_name);

	// get target object
	target_object = (CGame *)LinkedDataObject::Try_fetch_item_by_name(MS->objects, object_name);
	if (!target_object)
		Fatal_error("fn_mega_generic_interact - named object [%s] don't exist", object_name);

	// set socket_id ready for any special socket functions
	M->target_id = LinkedDataObject::Fetch_item_number_by_name(objects, object_name);

	// set this flag to avoid interact with id=0 based problems
	M->interacting = TRUE8;

	// now try and find a script with the 'interact' extension i.e. ???::interact
	for (uint32 k = 0; k < CGameObject::GetNoScripts(target_object); k++) {
		if (script_hash == CGameObject::GetScriptNamePartHash(target_object, k)) {
			Zdebug("found target interact script", k);
			// script k is the one to run
			// get the address of the script we want to run

			char *ad = (char *)LinkedDataObject::Try_fetch_item_by_hash(scripts, CGameObject::GetScriptNameFullHash(target_object, k));

			// write actual offset
			L->logic[2] = ad;

			// write reference for change script checks later - i.e. FN_context_chosen_script
			L->logic_ref[2] = ad;

			L->logic_level = 2; // reset to level 2
			// action script will fall back to looping level 1

			// script interpreter shouldn't write a pc back
			return (IR_GOSUB);
		}
	}

	Fatal_error("fn_mega_generic_interact - [%s] finds target object [%s] has not got an 'interact' script", CGameObject::GetName(object), object_name);

	return (IR_STOP);
}

bool8 _game_session::chi_interacts(int32 id, const char *script_name) {
	// chi interacts with a follow object

	// set it up on level 2 and change script level

	CGame *target_object;
	uint32 script_hash;

	script_hash = HashString(script_name);

	// get target object
	target_object = (CGame *)LinkedDataObject::Fetch_item_by_number(MS->objects, id);
	if (!target_object)
		Fatal_error("chi_interacts - object [%d] don't exist", id);

	// set socket_id ready for any special socket functions
	M->target_id = id;

	// set this flag to avoid interact with id=0 based problems
	M->interacting = TRUE8;

	// now try and find a script with the passed extension i.e. ???::looping
	for (uint32 k = 0; k < CGameObject::GetNoScripts(target_object); k++) {
		if (script_hash == CGameObject::GetScriptNamePartHash(target_object, k)) {
			// script k is the one to run
			// get the address of the script we want to run
			char *ad = (char *)LinkedDataObject::Try_fetch_item_by_hash(scripts, CGameObject::GetScriptNameFullHash(target_object, k));

			// write actual offset
			L->logic[2] = ad;

			// write reference for change script checks later - i.e. FN_context_chosen_script
			L->logic_ref[2] = ad;

			L->logic_level = 2; // reset to level 2
			// action script will fall back to looping level 1

			// script interpreter shouldn't write a pc back
			return TRUE8;
		}
	}

	// couldnt find chi script

	return FALSE8;
}

} // End of namespace ICB