#ifndef WATCH_FACE_H
#define WATCH_FACE_H

#include "lvgl.h"
#include <time.h>

typedef void (*DateTimeCb_t)(struct tm * const dateTime);
typedef uint8_t (*BatteryIndicatorCb_t)(void);

typedef struct DateWindow
{
    lv_obj_t *dateWindowWidget;
    char dateWindowText[3];
} DateWindow_t;

typedef struct WatchHand
{
    lv_obj_t *handImg;
    float handAngle;
}WatchHand_t;

typedef struct BatteryIndicator
{
    lv_obj_t *label;
    lv_obj_t *battery_arc;
    char text[7];
} BatteryIndicator_t;

/* Watch face context object */
typedef struct WatchFace
{
    DateTimeCb_t dateTimeCb; //Call back function used to retrieve the date and time needed by the watch face
    BatteryIndicatorCb_t batteryIndicatorCb; //Call back function used to update the battery level every minute
    WatchHand_t hourHand;
    WatchHand_t minuteHand;
    WatchHand_t secondHand;
    WatchHand_t mediumHand24h;
    lv_timer_t *handAnimationTimer;
    lv_obj_t *display;
    DateWindow_t dateWindow;
    BatteryIndicator_t batteryIndicator;

    struct tm dateTime;
} WatchFace_t;

/* Initializes the watch face context object */
void watch_face_init(WatchFace_t * const watchFace);

/**
 * @brief Registers a call back function used by the watch face to retrieve the time and date
 * 
 * @param watchFace a pointer to the watch face context structure.
 * @param DateTimeCb a pointer to a function having the right definition.
 */
void watch_face_register_date_time_cb(WatchFace_t * const watchFace, DateTimeCb_t DateTimeCb);

/**
 * @brief Registers a call back function used to refresh the battery indicator.
 * The refreshing is done every minute or every time the @ref watch_face_force_sync is called.
 * 
 * @param watchFace a pointer to the watch face context structure.
 * @param BatteryIndicatorCb a pointer to a function having the right definition.
 */
void watch_face_register_battery_indicator_cb(WatchFace_t * const watchFace, BatteryIndicatorCb_t BatteryIndicatorCb);

/**
 * @brief Graphically builds the watch face 
 * 
 * @param watchFace a pointer to the watch face context structure.
 */
void watch_face_create(WatchFace_t * const watchFace);

/**
 * @brief Sets the battery indicator to the given value in percent.
 * 
 * @param watchFace a pointer to the watch face context structure.
 * @param percentage the value to set the indicator to in percent.
 */
void watch_face_set_battery_indicator(WatchFace_t * const watchFace, uint8_t percentage);

/**
 * @brief Forces the watch face to sync up with the RTC by calling the provided date_time_cb
 * 
 * @param watchFace a pointer to the watch face context structure.
 */
void watch_face_force_sync(WatchFace_t * const watchFace);

/**
 * @brief Frees all resources used by the WatchFace object
 * 
 * @param watchFace a pointer to the watch face context structure.
 */
void watch_face_destroy(WatchFace_t * const watchFace);

#endif // WATCH_FACE_H