/*
 * aclock - ascii clock for Windows Console
 *
 * Copyright (c) 1994-2010 by Antoni Sawicki <tenox@tenox.tc>
 * Version 2.1 (win32); Mountain View, November 2010
 *
 * Compile (LCC) : lc -O aclock-win32.c -o aclock.exe -s
 * Compile (MSVC): cl aclock-win32.c
 *
 */

#include <windows.h>
#include <stdio.h>
#include <math.h>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif


HANDLE hConsole;
CONSOLE_SCREEN_BUFFER_INFO console_info;

void cls(void){
	COORD home = {0,0};
	DWORD size;
	int wchars;

	size = console_info.dwSize.X * console_info.dwSize.Y;
	FillConsoleOutputCharacter(hConsole, ' ', size, home, &wchars);
}

void draw_point(int x, int y, char p){
	COORD cursor_position;
	int wchars;
	cursor_position.X = x;
	cursor_position.Y = y;

	SetConsoleCursorPosition(hConsole, cursor_position);
	WriteConsole(hConsole, &p, 1, &wchars, NULL);
}

void draw_circle(int hand_max, int sYcen, int sXcen, int FontHW, int hour){
	int x,y,r;
	char c;

	for(r=0;r<60;r++){
		x=cos(r*M_PI/180*6)*hand_max*FontHW+sXcen;
		y=sin(r*M_PI/180*6)*hand_max+sYcen;
		switch (r) {
			case 0:
			case 5:
			case 10:
			case 15:
			case 20:
			case 25:
			case 30:
			case 35:
			case 40:
			case 45:
			case 50:
			case 55:
				c='o';
				break;
			default:
				c='.';
				break;
		}
		draw_point(x,y,c);
	}
}

void draw_hand(int minute, int hlenght, char c, int sXcen, int sYcen, int FontHW){
	int x,y,n;
	float r=(minute-15)*(M_PI/180)*6;

	for(n=1; n<hlenght; n++){
		x=cos(r)*n*FontHW+sXcen;
		y=sin(r)*n+sYcen;
		draw_point(x,y,c);
	}
}


void draw_text(char p[], int x, int y){
	COORD cursor_position;
	int wchars;

	cursor_position.X = x;
	cursor_position.Y = y;

	SetConsoleCursorPosition(hConsole, cursor_position);
	WriteConsole(hConsole, p, strlen(p), &wchars, NULL);
}



int main(void){
	char INFO[]="Written by Antoni Sawicki <tenox@tenox.tc>"
		    "Version 2.0; Dublin, Apr 2010\n";
	char digital_time[15];
	int FontHW = 2;
	int sXmax, sYmax, sXmaxo, sYmaxo, smax, hand_max, sXcen, sYcen, wchars;
	CONSOLE_CURSOR_INFO cursor_info;
	SYSTEMTIME local_time;

	hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
	SetConsoleTitle("aclock 2.0 (Win32)");
	cursor_info.bVisible = FALSE;
	cursor_info.dwSize = 1;
	SetConsoleCursorInfo(hConsole, &cursor_info);
	sXmaxo=sYmaxo=sXmax=sYmax=hand_max=sXcen=sYcen=0;

	while(1){
		sXmaxo=sXmax;
		sYmaxo=sYmax;

		GetConsoleScreenBufferInfo(hConsole, &console_info);

		sXmax = console_info.srWindow.Right+1;
		sYmax = console_info.srWindow.Bottom+1;

		if((sXmax!= sXmaxo) || (sYmax != sYmaxo)) {
			if(sXmax/2<=sYmax)
				smax=sXmax/2;
			else
				smax=sYmax;

			hand_max = (smax/2)-1;

			sXcen = sXmax/2;
			sYcen = sYmax/2;

			cls();

			draw_circle(hand_max, sYcen, sXcen, FontHW, local_time.wHour);
		}

		GetSystemTime(&local_time);

		draw_hand(local_time.wHour*5+local_time.wMinute/10, 2*hand_max/3, 'h', sXcen, sYcen, FontHW);
		draw_hand(local_time.wMinute, hand_max-2, 'm', sXcen, sYcen, FontHW);
		draw_hand(local_time.wSecond, hand_max-1, '.', sXcen, sYcen, FontHW);


		draw_text(".:ACLOCK:.", sXcen-5,sYmax/4);
		sprintf(digital_time, "[%02d:%02d:%02d]", local_time.wHour, local_time.wMinute, local_time.wSecond);
		draw_text(digital_time, sXcen-5, 4*sYmax/5);

		Sleep(1000);

		draw_hand(local_time.wHour*5+local_time.wMinute/10, 2*hand_max/3, ' ', sXcen, sYcen, FontHW);
		draw_hand(local_time.wMinute, hand_max-2, ' ', sXcen, sYcen, FontHW);
		draw_hand(local_time.wSecond, hand_max-1, ' ', sXcen, sYcen, FontHW);
    }
	return 0;
}