textadv/src/game.c

/* Copyright © 2020 tyrolyean
 *
 * 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 "game.h"
#include "structures.h"
#include "16550.h"

#include <string.h>
#include <stdio.h>
#include <ctype.h>

char command_buffer[100];
uint8_t command_buffer_pointer = 0x00;

uint8_t current_room = ROOM_LONELYROAD;

uint8_t computer_state = 0;
bool bear_shot = false;

void routine_game(){
	
	if(command_buffer_pointer >= sizeof(command_buffer)){
		
		command_buffer_pointer = 0x00;
		memset(command_buffer, 0, sizeof(command_buffer));
		
		println("\nToo much input!");
		return;
	}

	if(command_buffer[command_buffer_pointer-1] == '\n' || 
			command_buffer[command_buffer_pointer-1] == '\r'){
		/* A command from the user has been received, we are ready to 
		 * do something!*/

		int8_t action_id = -1;
		for(size_t i = 0; i < sizeof(action_table)/sizeof(const char*);
			i++){
			if(strncasecmp(action_table[i], command_buffer, 
				strlen(action_table[i])) == 0){
				action_id = i;
				break;
			}
			
		}
		if(action_id < 0){
			println(info_table[1]);
		}else{
			perform_action(action_id);
			
		}
		
		command_buffer_pointer = 0x00;
		memset(command_buffer, 0, sizeof(command_buffer));
	}

	return;
}

void ingest_user_char(char in){
	if(in == 0x7F /* DELETE CHAR */){
		command_buffer[command_buffer_pointer--] = 0x00;
		
	}else{
		command_buffer[command_buffer_pointer++] = in;
	}
	return;
}

void perform_action(uint8_t action_id){
	putchar_16550('\n', NULL);
	switch(action_id){
		default:
		case ACTION_HELP:
			println("You can:");
			for(size_t i = 0; i < NUM_ACTIONS; i++){
				println("    %s",action_table[i]);
			}
			break;
		
		case ACTION_DESCRIBE:
			describe_room(current_room, false);
			break;

		case ACTION_NORTH:
		case ACTION_SOUTH:
		case ACTION_WEST:
		case ACTION_EAST:
			move_direction(action_id -1);
			break;
		case ACTION_INVENTORY:
			print_inventory();
			break;
		case ACTION_SEARCH:
			print_room_item();
			break;
		case ACTION_TAKE:
			consume_room_item(command_buffer+
				strlen(action_table[ACTION_TAKE])+1);
			break;
		case ACTION_USE:
			use_item(command_buffer+
				strlen(action_table[ACTION_USE])+1);
			break;
		
	};
	println(info_table[3]);

	return;
}

void move_direction(uint8_t direction){
	if(!room_map_table[current_room][direction]){
		println(info_table[4]);
		return;
	}
	println("Moving towards %s",action_table[direction+1]);
	current_room = room_map_table[current_room][direction];
	describe_room(current_room,true);
	current_track = room_track_map[current_room];
	return;
}

void describe_room(uint8_t room, bool auto_desc){
	
	println(room_table[room]);
	if(room_visited_table[room] && auto_desc){
		room_visited_table[room] = true;
		return;
	}
	room_visited_table[room] = true;
	putchar_16550('\n', NULL);
	println(room_description_table[room]);
	
	return;
}

void print_inventory(){
	bool found_item = false;
	for(size_t i = 0; i < NUM_ITEMS; i++){
		if(inventory[i]){
			found_item = true;
			break;
		}
	}
	if(found_item){
		println("You have:");
		for(size_t i = 0; i < NUM_ITEMS; i++){
			if(inventory[i]){
				println("    %s",item_table[i]);
			}
		}

	}else{
		println("Your inventory is empty");
	}
	
	return;
}

void print_room_item(){
	if(item_room_map[current_room] < 0){
		println(info_table[6]);
	}else{
		println("You found a %s", 
			item_table[item_room_map[current_room]]);
	}
	return;
}

void consume_room_item(const char* item_name){
	if(item_room_map[current_room] < 0){
		println(info_table[6]);
	}else{
		for(int8_t i = 0; i < NUM_ITEMS; i++){
			if(strncasecmp(item_table[i], item_name, 
				strlen(item_table[i])) == 0){
				
				if(item_room_map[current_room] != i){
					break;
				}
				
				println("You took the %s", 
					item_table[item_room_map[
					current_room]]);
				
				inventory[item_room_map[current_room]] = true;
				item_room_map[current_room] = -1;
				return;
			}
		
		}
		println("That's not here...");
		
	}
	return;
}
void use_item(const char* item_name){
		
	for(size_t i = 0; i < NUM_ITEMS; i++){
		if(strncasecmp(item_table[i], item_name, 
			strlen(item_table[i])) == 0){
			use_item_id(i);
			return;
		}
		
	}
	println(info_table[2]);
	return;
	
}

void use_item_id(uint8_t item_id){
	if(!inventory[item_id]){
		println(info_table[2]);
		return;
	}
	
	
	switch(item_id){
		case ITEM_SAUSAGE:
			if(current_room == ROOM_SNDIRTROAD){
				inventory[ITEM_SAUSAGE] = false;
				room_map_table[current_room][DIRECTION_NORTH] =
					ROOM_FIREPLACE;
				println(info_table[10]);
				return;
			}
			break;
		case ITEM_PISTOL:
			if(current_room == ROOM_SNDIRTROAD){
				room_map_table[current_room][DIRECTION_NORTH] =
					ROOM_FIREPLACE;
				println(info_table[7]);
				bear_shot = true;
				return;
			} else if(current_room == ROOM_NOTHING){
				/* The real end i guess. I won't put this in the
				 * info table as it *SHOULD* only be displayed
				 * once.
				*/
				println("You cry for help. It's no use. You "
					"attempt to shoot yourself. It's no "
					"use... You run out of bullets");
				inventory[ITEM_PISTOL] = false;
				return;
			}
			break;
		case ITEM_KEY:
			if(current_room == ROOM_EWSTREET){
				inventory[ITEM_KEY] = false;
				room_map_table[current_room][DIRECTION_NORTH] =
					ROOM_OLDHOUSE;
			println(info_table[13]);
				return;
			}
			break;
		case ITEM_FLOPPY:
		case ITEM_FLESH:
		case ITEM_SCREWDRIVER:
		case ITEM_KEYBOARD:
			if(current_room == ROOM_COMPUTER){
				if(perform_computer_action(item_id)){
					return;
				}
				
			}
			break;
	};
	println(info_table[2]);

	return;
}

bool perform_computer_action(uint8_t item_id){
	
	static bool fleshed = false;
	if(item_id == ITEM_KEYBOARD && 
		computer_state == COMPUTER_STATE_NOTHING){
		computer_state = COMPUTER_STATE_KEYBOARD;
		inventory[item_id] = false;
		println("You connected the keyboard");
		return true;
	}
	
	if(item_id == ITEM_FLOPPY && 
		computer_state == COMPUTER_STATE_KEYBOARD){
		computer_state = COMPUTER_STATE_FLOPPY;
		inventory[item_id] = false;
		println("You inseted the floppy disk");
		return true;
	}
	if(item_id == ITEM_FLESH && 
		computer_state == COMPUTER_STATE_KEYBOARD){
		computer_state = COMPUTER_STATE_FLOPPY;
		inventory[item_id] = false;
		println("You inserted the flesh into the floppy drive");
		fleshed = true;
		return true;
	}
	if(item_id == ITEM_SCREWDRIVER && 
		computer_state == COMPUTER_STATE_FLOPPY){
		computer_state = COMPUTER_STATE_FLOPPY;
		inventory[item_id] = false;
		/* Perform a reset of the game */
		println("You start the computer with the screwdriver, sit down"
			" and watch it boot into a textadventure:");
		
		reset_game(fleshed);
		return true;
	}

	return false;
}
/* Resets the game into "original" state or the bear dead state or the FLESH
 * game state. FLESH is basically the end. You need to reset your computer 
 * afterwards.
 */
void reset_game(bool fleshed){
	
	/* clear inventory */
	memset(inventory, 0, sizeof(inventory));
	/* Reset rooms visited */
	memset(room_visited_table, 0, sizeof(inventory));
	/* Reset items in rooms */
	for(size_t i = 0; i < NUM_ROOMS; i++){
		item_room_map[i] = -1;
	}
	
	if(fleshed){
		current_room = ROOM_NOTHING;
		inventory[ITEM_PISTOL] = true;
	}else if(bear_shot){
		current_room = ROOM_LONELYROAD;
		room_description_table[ROOM_SNDIRTROAD] = sndirtroad_msg[1];
		item_room_map[ROOM_SNDIRTROAD] = ITEM_FLESH;
		
	}else{
		current_room = ROOM_LONELYROAD;
		room_map_table[ROOM_SNDIRTROAD][DIRECTION_NORTH] = 0x00;
		item_room_map[ROOM_SNDIRTROAD] = ITEM_SAUSAGE;
		item_room_map[ROOM_LONELYROAD] = ITEM_PISTOL;
		item_room_map[ROOM_BASEMENT] = ITEM_FLOPPY;
	}
	
	item_room_map[ROOM_EWSTREET] = ITEM_KEY;
	item_room_map[ROOM_OLDHOUSE] = ITEM_SCREWDRIVER;
	item_room_map[ROOM_ATTIC] = ITEM_KEYBOARD;
	
	computer_state = COMPUTER_STATE_NOTHING;

	room_map_table[ROOM_EWSTREET][DIRECTION_NORTH] = 0x00;
	current_track = room_track_map[current_room];
	describe_room(current_room, false);
		

	return;
}

void init_game(){
	
	room_description_table[ROOM_SNDIRTROAD] = sndirtroad_msg[0];
	info_table[3] = user_action_req_msgs[0];
	return;	
}