#include <stdio.h>
#include <stdlib.h>
#include <cairo/cairo-pdf.h>
#include <pango/pangocairo.h>

#include "draw.h"
#include "date.h"

// Metric
#define A4_WIDTH 210
#define A4_HEIGHT 297

#define US_LETTER_WIDTH 216
#define US_LETTER_HEIGHT 279

// Font Settings
#define FONT_FAMILY "Sans"
#define FONT_SIZE_NORMAL 10
#define FONT_SIZE_LARGE 40

int main (void) {
   // Definitions
   // -----------
   //double width = US_LETTER_WIDTH;
   //double height = US_LETTER_HEIGHT;

   double width = A4_WIDTH;
   double height = A4_HEIGHT;

   // Convert to inches, then 1 unit = 1/72th inch
   width = (width / 25.4) * 72.0;
   height = (height / 25.4) * 72.0;

   extern char *months[];
   int num_of_months = 12;
   extern int days_in_month[12];

   // TBD: Add ability to choose filename
   char *filename;
   filename = "output.pdf";

   // Create dimensions struct to hold measurements
   struct dimensions dim;

   struct month_info month;


   // Leap year adjustment: increment February day count by one
   int year = 2026;
   if (isleap(year)) {
      days_in_month[1]++;
   }




   // Initialization
   // --------------
   // Calculates measurements, stores them in dimensions struct. See "draw.h"
   calculate_dimensions(width, height, &dim);

   cairo_surface_t *surface = cairo_pdf_surface_create(filename, dim.paper_width, dim.paper_height);
   cairo_t *paper = cairo_create(surface);

   // Sub-surface for rendering content in day boxes
   cairo_surface_t *day = 
      cairo_surface_create_similar(surface, CAIRO_CONTENT_COLOR_ALPHA, dim.day_width, dim.day_height);
   cairo_t *cd = cairo_create(day);

   // General rectangle struct for positioning. Used whenever dimensions need
   // to be passed to another function
   // PangoRectangle logical_extents;

   // Fill background with white color
   cairo_set_source_rgb (paper, 255.0, 255.0, 255.0);
   fill_bg(paper);




   // Construction
   // ------------
   // Print dimensions, for debugging
   //print_dimensions(&dim);

   // Draw all months
   //
   struct RGB color;

   color = hex_to_rgb("#81bbd3");

   printf("red: %f\n", color.r);
   printf("green: %f\n", color.g);
   printf("blue: %f\n", color.b);

   for (int i = 0; i < num_of_months; i++) {
      // Set the 
      month.first_day = day_of_week(1, i + 1, year);
      month.num_of_days = days_in_month[i];

      cairo_set_source_rgb (paper, 0.0, 0.0, 0.0);
      draw_month_title(paper, &dim, months[i]);

      calculate_minimum_rows(&month, &dim);

      draw_month(paper, cd, day, &month, &dim);
      draw_month_grid(paper, &month, &dim);

      // Go to next page in pdf
      cairo_show_page(paper); 
   }


   

   // Clean up
   // --------
   cairo_destroy(paper);
   cairo_surface_destroy(surface);
   return 0;
}