#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "bsp/board.h"
#include "tusb.h"

/* Blink pattern
 * - 250 ms	: device not mounted
 * - 1000 ms : device mounted
 * - 2500 ms : device is suspended
 */
enum	{
	BLINK_NOT_MOUNTED = 250,
	BLINK_MOUNTED = 1000,
	BLINK_SUSPENDED = 2500,
};

static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;

void led_blinking_task(void);

/*------------- MAIN -------------*/
int main(void)
{
	board_init();

	// init device stack on configured roothub port
	tud_init(BOARD_TUD_RHPORT);

	while (1)
	{
		tud_task(); // tinyusb device task
		led_blinking_task();
	}

	return 0;
}

//--------------------------------------------------------------------+
// Device callbacks
//--------------------------------------------------------------------+

// Invoked when device is mounted
void tud_mount_cb(void)
{
	blink_interval_ms = BLINK_MOUNTED;
}

// Invoked when device is unmounted
void tud_umount_cb(void)
{
	blink_interval_ms = BLINK_NOT_MOUNTED;
}

// Invoked when usb bus is suspended
// remote_wakeup_en : if host allow us	to perform remote wakeup
// Within 7ms, device must draw an average of current less than 2.5 mA from bus
void tud_suspend_cb(bool remote_wakeup_en)
{
	(void) remote_wakeup_en;
	blink_interval_ms = BLINK_SUSPENDED;
}

// Invoked when usb bus is resumed
void tud_resume_cb(void)
{
	blink_interval_ms = BLINK_MOUNTED;
}

//--------------------------------------------------------------------+
// USB HID
//--------------------------------------------------------------------+

// Invoked when received GET_REPORT control request
// Application must fill buffer report's content and return its length.
// Return zero will cause the stack to STALL request
uint16_t tud_hid_get_report_cb(uint8_t itf, uint8_t report_id,
	hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
{
	// TODO not Implemented
	(void) itf;
	(void) report_id;
	(void) report_type;
	(void) buffer;
	(void) reqlen;

	return 0;
}

// Invoked when received SET_REPORT control request or
// received data on OUT endpoint ( Report ID = 0, Type = 0 )
void tud_hid_set_report_cb(uint8_t itf, uint8_t report_id,
	hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
{
	// This example doesn't use multiple report and report ID
	(void) itf;
	(void) report_id;
	(void) report_type;

	// echo back anything we received from host
	tud_hid_report(0, buffer, bufsize);
}

//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
void led_blinking_task(void)
{
	static uint32_t start_ms = 0;
	static bool led_state = false;

	// Blink every interval ms
	if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
	start_ms += blink_interval_ms;

	board_led_write(led_state);
	led_state = 1 - led_state; // toggle
}