#include <engine/e_client_interface.h>
#include <string.h> // strlen
#include "lineinput.hpp"

LINEINPUT::LINEINPUT()
{
	clear();
}

void LINEINPUT::clear()
{
	mem_zero(str, sizeof(str));
	len = 0;
	cursor_pos = 0;
}

void LINEINPUT::set(const char *string)
{
	str_copy(str, string, sizeof(str));
	len = strlen(str);
	cursor_pos = len;
}

void LINEINPUT::process_input(INPUT_EVENT e)
{
	if(cursor_pos > len)
		cursor_pos = len;
	
	char c = e.ch;
	int k = e.key;
	
	// 127 is produced on Mac OS X and corresponds to the delete key
	if (!(c >= 0 && c < 32) && c != 127)
	{
		if (len < sizeof(str) - 1 && cursor_pos < sizeof(str) - 1)
		{
			memmove(str + cursor_pos + 1, str + cursor_pos, len - cursor_pos + 1);
			str[cursor_pos] = c;
			cursor_pos++;
			len++;
		}
	}
	
	if(e.flags&INPFLAG_PRESS)
	{
		if (k == KEY_BACKSPACE && cursor_pos > 0)
		{
			memmove(str + cursor_pos - 1, str + cursor_pos, len - cursor_pos + 1);
			cursor_pos--;
			len--;
		}
		else if (k == KEY_DELETE && cursor_pos < len)
		{
			memmove(str + cursor_pos, str + cursor_pos + 1, len - cursor_pos);
			len--;
		}
		else if (k == KEY_LEFT && cursor_pos > 0)
			cursor_pos--;
		else if (k == KEY_RIGHT && cursor_pos < len)
			cursor_pos++;
		else if (k == KEY_HOME)
			cursor_pos = 0;
		else if (k == KEY_END)
			cursor_pos = len;
	}
}