#include <math.h>

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

void hexagram_fuel_init(hexagram_fuel *fuel,
                        double x,
                        double y,
                        double radius,
                        double redline) {
    hexagram_gauge_init(&fuel->gauge, x, y, radius,
        300.0 * (M_PI / 180.0),
        420.0 * (M_PI / 180.0));

    fuel->redline = redline;
}

void hexagram_fuel_draw_face(hexagram_fuel *fuel,
                             cairo_t *cr) {
    int i;

    cairo_set_source_rgb(cr, 1, 1, 1);

    cairo_arc(cr,
              fuel->gauge.x,
              fuel->gauge.y,
              fuel->gauge.radius,
              0,
              2.0 * M_PI);

    cairo_stroke(cr);

    cairo_move_to(cr,
                  fuel->gauge.x - 0.8 * fuel->gauge.radius,
                  fuel->gauge.y - 0.1 * fuel->gauge.radius);

    cairo_show_text(cr, "0");

    cairo_move_to(cr,
                  fuel->gauge.x - 0.15 * fuel->gauge.radius,
                  fuel->gauge.y - 0.50 * fuel->gauge.radius);

    cairo_show_text(cr, "1/2");

    cairo_move_to(cr,
                  fuel->gauge.x + 0.65 * fuel->gauge.radius,
                  fuel->gauge.y - 0.10 * fuel->gauge.radius);

    cairo_show_text(cr, "1");

    /*
     * Draw gauge graduations
     */
    for (i=0; i<=16; i++) {
        if (i <= (16.0 * fuel->redline)) {
            cairo_set_source_rgb(cr, 1, 0, 0);
        } else {
            cairo_set_source_rgb(cr, 1, 1, 1);
        }

        hexagram_gauge_draw_mark(&fuel->gauge,
                                 cr,
                                 (i % 4)? 0.8: 0.7,
                                 0.9,
                                 (double)i / 16.0);
    }
}

void hexagram_fuel_draw_needle(hexagram_fuel *fuel,
                               cairo_t *cr,
                               double level) {
    if (level > 1.0) {
        level = 1.0;
    }

    /*
     * Draw a tiny boi circle
     */
    cairo_set_source_rgb(cr, 1, 1, 1);

    cairo_arc(cr,
              fuel->gauge.x,
              fuel->gauge.y,
              fuel->gauge.radius * 0.08,
              0,
              2.0 * M_PI);

    cairo_stroke(cr);

    hexagram_gauge_draw_needle(&fuel->gauge,
                               cr,
                               0.9,
                               level / 1.0);
}