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

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

void hexagram_tacho_init(hexagram_tacho *tacho,
                         double x,
                         double y,
                         double radius,
                         double redline) {
    hexagram_gauge_init(&tacho->gauge,
                        x,
                        y,
                        radius,
                        232.0 * (M_PI / 180.0),
                        488.0 * (M_PI / 180.0));

    tacho->redline = redline;
}

void hexagram_tacho_draw_face(hexagram_tacho *tacho,
                              cairo_t *cr) {
    int i;

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

    cairo_set_font_size(cr, tacho->gauge.radius * 0.125);

    cairo_set_source_rgb(cr, 1, 1, 1);

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

    cairo_stroke(cr);

    /*
     * Draw face numbers
     */
    for (i=0; i<=80; i+=10) {
        char text[4];

        snprintf(text, 3, "%02d", i);

        hexagram_gauge_draw_number(&tacho->gauge,
                                   cr,
                                   0.85,
                                   i / 80.0,
                                   text);
    }

    for (i=0; i<=80; i++) {
        if (i * 100 >= tacho->redline) {
            cairo_set_source_rgb(cr, 1, 0, 0);
        }

        hexagram_gauge_draw_mark(&tacho->gauge,
                                 cr,
                                 i % 5? 0.75: 0.7,
                                 0.8,
                                 i / 80.0);
    }
}

void hexagram_tacho_draw_needle(hexagram_tacho *tacho,
                                cairo_t *cr,
                                double rpm) {
    if (rpm > 8000) {
        rpm = 8000;
    }

    hexagram_gauge_draw_needle(&tacho->gauge,
                               cr,
                               0.8,
                               rpm / 8000);
}