#include <stdio.h>
#include <termios.h>
#include <time.h>
#include <sys/time.h>

#include "util.h"

static struct termios initial_setting, new_setting;
static int peek_character = -1;

void keyboard_initialize( void )
{
    tcgetattr( 0, &initial_setting );
    new_setting = initial_setting;
    new_setting.c_lflag &= ~ICANON;
    new_setting.c_lflag &= ~ECHO;
    new_setting.c_lflag &= ~ISIG;
    new_setting.c_cc[VMIN] = 0;
    new_setting.c_cc[VTIME] = 0;
    tcsetattr( 0, TCSANOW, &initial_setting );
}

void keyboard_finalize( void )
{
    tcsetattr( 0, TCSANOW, &initial_setting );
}

int keyboard_is_hit( void )
{
    char ch;
    int nread;
	
	if ( peek_character != -1 )
    {
        return 1;
    }
    new_setting.c_cc[VMIN] = 0;
    tcsetattr( 0, TCSANOW, &new_setting );
    nread = read( 0, &ch, 1 );
    new_setting.c_cc[VMIN] = 1;
    tcsetattr( 0, TCSANOW, &new_setting );
	
    if ( nread == 1 )
    {
        peek_character = ch;
        return 1;
    }

    return 0;
}

char keyboard_get_char( void )
{
    char ch;

    if ( peek_character != -1 )
    {
        ch = peek_character;
        peek_character = -1;
        return ch;
    }
    read( 0, &ch, 1 );
    return ch;
}

void debug_print_array( const char *label, const unsigned char *data, int length )
{
    int i;
    printf( "%s", label );
    for( i = 0 ; i < length; i++ )
    {
        if( (i % 16) == 0 )
        {
            printf("\n ");
        }
        printf("%02X ", data[ i ] );
    }
    printf("\n");
}

void debug_file_output( unsigned int id, char *suffix, const unsigned char *data, int length )
{
    FILE *fp;
    char file_name[256];

    sprintf( file_name, "./0x%08x.%s", id, suffix );
    fp = fopen( file_name, "wb" );
    fwrite( data, length, 1, fp );
    fclose( fp );
}

double gettimeofday_sec(void)
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return tv.tv_sec + (double)tv.tv_usec*1e-6;
}