#define lineBegin "LF OS #>"
#include <stdio.h>
#include <ctype.h>
#include <main.h>
char *commands[1024];
char *descriptions[1024];
void *callbacks[1024];
int lastCommandID = -1;
#include "commands.c"

int printf_res;

int strcmp(const char*a,const char*b)
{while(*a==*b&&*a)a++,++b;return*(const unsigned char*)a-*(const unsigned char*)b;}

char *strcpy(char *target, const char *source)
{char *orig_target = target;while(*source)*target++ = *source++;*target = '\0';	return orig_target;}

char *strtolower(char *s)
{
	int i = 0;
	while(s[i])
	{
		s[i] = tolower(s[i]);
		i++;
	}
	return s;
}

int register_command(char *command, char *description, void * callback)
{
	lastCommandID++;
	
	int i;
	for(i = 0; i < lastCommandID; i++)
	{
		if(strcmp(commands[i], command) == 0)
		{
			/* this command is already registered! */
			return 1;
		}
	}
	commands[lastCommandID] = command;
	descriptions[lastCommandID] = description;
	callbacks[lastCommandID] = callback;
	return 0;
}

void init_shell()
{
	clear_screen();
	register_command("help", "      prints this help on the screen", help);
	register_command("about", "     gives you some informations about this version of LF OS", about);
	register_command("halt", "      shuts down the computer.", poweroff);
	register_command("poweroff", "  shuts down the computer.", poweroff);
	register_command("reboot", "    restarts the computer.", reboot);
	register_command("cls", "       empties the content of the shell", cls);
	register_command("time", "      prints the current system time.", time);
	register_command("paging", "", pagingtest);
}

void parse_command(char *cmdline)
{
	printf("\n");
	int i;
	int cmdFound = 0;
	for(i = 0; i <= lastCommandID; i++)
	{
		if(strcmp(commands[i], cmdline) == 0)
		{
			if(callbacks[i] != NULL)
			{
				void (*callback)();
				callback = callbacks[i];
				callback();
			}
			cmdFound = 1;
			break;
		}
	}
	if(!cmdFound)
		printf("Command or File not found: '%s'!", cmdline);
	set_color(0x0E);
	printf("\n%s ", lineBegin, "/" /* current folder */);
	set_color(0x07);
}

int _start(void)
{	
	init_shell();
	set_color(0x0E);
	printf("Welcome to the LittleFox' Operating System 1.0 Alpha 5!\n\n%s ", lineBegin, "/" /* current folder */);
	set_color(0x07);
	char *command;
	while(1)
	{	
		command = strtolower(getline());
		parse_command(command);
		command = "";
	}
	return 0;
}