// ----------------------------------------------------------------------
// System Headers
// ----------------------------------------------------------------------

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

// ----------------------------------------------------------------------
// Local Headers
// ----------------------------------------------------------------------

#include "util.h"
#include "svg.h"

// ----------------------------------------------------------------------
// drawFace - Draw the minute marks (thicker every 5 minutes) and
//            the clock's numbers (1 - 12)
// ----------------------------------------------------------------------

static void drawFace(
   SVG *svg, int xc, int yc, int r1, int r2, int r3, int fontSize
)
{
   // Begin at 0 degrees with the number '3'

   int degrees = 0;
   int number  = 3;

   while(degrees < 360)
   {
      int width    = 1;
      int doNumber = 0;

      if(degrees % (360 / 12) == 0)
      {
         width    = 4;
         doNumber = 1;
      }

      XY p1 = utilGetXY(degrees, r1, xc, yc);
      XY p2 = utilGetXY(degrees, r2, xc, yc);

      svgLineEx(
         svg,
         utilRound(p1.mX),
         utilRound(p1.mY),
         utilRound(p2.mX),
         utilRound(p2.mY),
         width,
         svg->mColors.black
      );

      if(doNumber)
      {
         char buffer[255] = { '\0' };

         snprintf(buffer, sizeof(buffer), "%d", number);

         XY p3 = utilGetXY(degrees, r3, xc, yc);

         svgText(
            svg,
            utilRound(p3.mX) - (strlen(buffer) * fontSize) / 4,
            utilRound(p3.mY) + fontSize / 3,
            buffer,
            fontSize
         );

         if(++number > 12)
            number = 1;
      }

      degrees += (360 / 60);
   }
}

// ----------------------------------------------------------------------
// drawHand - Draw a handle with the specified width and radius, this
//            function is used for minutes and seconds but not hours
//            as it assumes 'value' is 0 => 60
// ----------------------------------------------------------------------

static void drawHand(
   SVG *svg,
   int value,
   int xc,
   int yc,
   int lineWidth,
   int radius
)
{
   double degrees = -90.0 + (value / 60.0) * 360.0;

   XY p = utilGetXY(degrees, radius, xc, yc);

   svgLineEx(
      svg, xc, yc, utilRound(p.mX), utilRound(p.mY), lineWidth, svg->mColors.black
   );
}

// ----------------------------------------------------------------------
// main
// ----------------------------------------------------------------------

int main()
{
   const int  WIDTH  = 500;
   const int  HEIGHT = 500;
   const char *NAME  = "clock.html";

   SVG *svg = svgOpen(NAME, "Clock", WIDTH, HEIGHT);

   if(!svg)
   {
      printf("Call to 'svgOpen' failed\n");
      return(1);
   }

   int hour   = 0;
   int minute = 0;
   int second = 0;

   int xc = svg->mWidth  / 2;
   int yc = svg->mHeight / 2;

   int theSize =
      (svg->mWidth <= svg->mHeight ? svg->mWidth : svg->mHeight);

   // The two outer edges of the clock face

   int r1 = utilRound(.400 * theSize);
   int r2 = utilRound(.375 * theSize);

   // The start and end of the minute marks and the
   // location of the numbers

   int r3 = utilRound(.358 * theSize);
   int r4 = utilRound(.338 * theSize);
   int r5 = utilRound(.298 * theSize);

   // The second, minute and hours hands

   int r6 = utilRound(.328 * theSize);
   int r7 = utilRound(.318 * theSize);
   int r8 = utilRound(.238 * theSize);

   svgCircle(svg, xc, yc, r1, svg->mColors.black, svg->mColors.none);
   svgCircle(svg, xc, yc, r2, svg->mColors.black, svg->mColors.none);

   drawFace(svg, xc, yc, r3, r4, r5, utilRound(.06 * theSize));

   svgCircle(svg, xc, yc, 4, svg->mColors.black, svg->mColors.black);

   utilGetHMS(&hour, &minute, &second);

   drawHand(svg, second, xc, yc, 2, r6);
   drawHand(svg, minute, xc, yc, 5, r7);

   // The 'degrees' calcuation for our hours hand is more complex
   // since the hand moves part of the way towards the next number
   // as it progresses through the hour (so, at 7:30 the hour hand
   // would be 1/2 way between the 7 and the 8.

   int degrees = utilRound(
      -90 + (hour % 12) / 12.0 * 360.0 + 30.0 * (minute / 60.0) + 0.5
   );

   XY p = utilGetXY(degrees, r8, xc, yc);

   svgLineEx(
      svg, xc, yc, utilRound(p.mX), utilRound(p.mY), 10, svg->mColors.black
   );

   svgBorder(svg, svg->mColors.black);

   svgClose(svg);

   printf("Successfully wrote: %s\n", NAME);

   return(0);
}