#include <stdint.h>
#include <util/delay.h>
#include "usb_keycodes.h"
#include "host.h"
#include "timer.h"
#include "print.h"
#include "mousekey.h"


static report_mouse_t report;
static report_mouse_t report_prev;

static uint8_t mousekey_repeat =  0;


/*
 * TODO: fix acceleration algorithm
 * see wikipedia http://en.wikipedia.org/wiki/Mouse_keys
 */
#ifndef MOUSEKEY_DELAY_TIME
#   define MOUSEKEY_DELAY_TIME 255
#endif


static inline uint8_t move_unit(void)
{
    uint8_t unit = (10 + (mousekey_repeat));
    return unit > 127 ? 127 : unit;
}

void mousekey_decode(uint8_t code)
{
    if      (code == KB_MS_UP)      report.y -= move_unit();
    else if (code == KB_MS_DOWN)    report.y += move_unit();
    else if (code == KB_MS_LEFT)    report.x -= move_unit();
    else if (code == KB_MS_RIGHT)   report.x += move_unit();
    else if (code == KB_MS_BTN1)    report.buttons |= MOUSE_BTN1;
    else if (code == KB_MS_BTN2)    report.buttons |= MOUSE_BTN2;
    else if (code == KB_MS_BTN3)    report.buttons |= MOUSE_BTN3;
/*
    else if (code == KB_MS_BTN4)    report.buttons |= MOUSE_BTN4;
    else if (code == KB_MS_BTN5)    report.buttons |= MOUSE_BTN5;
    else if (code == KB_MS_WH_UP)   report.v += 1;
    else if (code == KB_MS_WH_DOWN) report.v -= 1;
    else if (code == KB_MS_WH_LEFT) report.h -= 1;
    else if (code == KB_MS_WH_RIGHT)report.h += 1;
*/
}

bool mousekey_changed(void)
{
    return (report.buttons != report_prev.buttons ||
            report.x != report_prev.x ||
            report.y != report_prev.y ||
            report.x || report.y);
    //return (report.buttons != report_prev.buttons || report.x || report.y);
}

void mousekey_send(void)
{
    static uint16_t last_timer = 0;

    if (!mousekey_changed()) {
        mousekey_repeat = 0;
        return;
    }

    // send immediately when buttun state is changed
    if (report.buttons == report_prev.buttons) {
        // TODO: delay parameter setting
        if ((timer_elapsed(last_timer) < (mousekey_repeat == 1 ? 20 : 5))) {
            return;
        }
    }

    if (report.x && report.y) {
        report.x *= 0.7;
        report.y *= 0.7;
    }

    /*
    print("mousekey_repeat: "); phex(mousekey_repeat); print("\n");
    print("timer: "); phex16(timer_read()); print("\n");
    print("last_timer: "); phex16(last_timer); print("\n");
    print("mousekey: "); phex(report.buttons); print(" "); phex(report.x); print(" "); phex(report.y); print("\n");
    */

    host_mouse_send(&report);
    report_prev.buttons = report.buttons;
    report_prev.x = report.x;
    report_prev.y = report.y;
    if (mousekey_repeat != 0xFF) mousekey_repeat++;
    last_timer = timer_read();
    mousekey_clear_report();
}

void mousekey_clear_report(void)
{
    report.buttons = 0;
    report.x = 0;
    report.y = 0;
}