#include <math.h>

#include <hexagram/gauge.h>
#include <hexagram/thermo.h>

void hexagram_thermo_draw_face(cairo_t *cr,
                               double x,
                               double y,
                               double r,
                               double redline) {
    int i;

    cairo_select_font_face(cr, "Helvetica",
      CAIRO_FONT_SLANT_NORMAL,
      CAIRO_FONT_WEIGHT_NORMAL);

    cairo_set_font_size(cr, r * 0.2);

    cairo_set_source_rgb(cr, 1, 1, 1);
    cairo_arc(cr, x, y, r, 0, 2*M_PI);
    cairo_stroke(cr);

    /*
     * Draw face numbers
     */
    cairo_move_to(cr, x - 0.8 * r, y - 0.1 * r);
    cairo_show_text(cr, "120");

    cairo_move_to(cr, x - 0.15 * r, y - 0.5 * r);
    cairo_show_text(cr, "190");

    cairo_move_to(cr, x + 0.5 * r, y - 0.1 * r);
    cairo_show_text(cr, "260");

    /*
     * Draw gauge graduations
     */
    for (i=0; i<=140; i+=7) {
        if (i + 120 >= redline) {
            cairo_set_source_rgb(cr, 1, 0, 0);
        }

        hexagram_gauge_draw_mark(cr, x, y,
                                 ((i % 35)? 0.8: 0.7) * r,
                                 0.90 * r,
                                 300  * (M_PI/180),
                                 420  * (M_PI/180),
                                 i / 140.0);
    }
}

void hexagram_thermo_draw_needle(cairo_t *cr,
                                 double x,
                                 double y,
                                 double r,
                                 double temp) {
    if (temp > 260) {
        temp = 260;
    }

    /*
     * Draw a tiny boi circle
     */
    cairo_set_source_rgb(cr, 1, 1, 1);
    cairo_arc(cr, x, y, 0.08 * r, 0, 2*M_PI);
    cairo_stroke(cr);

    hexagram_gauge_draw_needle(cr, x, y,   0.9 * r,
                               300   * (M_PI/180),
                               420   * (M_PI/180),
                               temp / 260);
}