/**
 * @file lv_anim.h
 *
 */

#ifndef LV_ANIM_H
#define LV_ANIM_H

#ifdef __cplusplus
extern "C" {
#endif

/*********************
 *      INCLUDES
 *********************/
#include "../lv_conf_internal.h"
#include "lv_types.h"
#include "lv_math.h"
#include "lv_timer.h"
#include "lv_ll.h"

/*********************
 *      DEFINES
 *********************/

#define LV_ANIM_REPEAT_INFINITE      0xFFFFFFFF
#define LV_ANIM_PLAYTIME_INFINITE    0xFFFFFFFF

/*
 * Macros used to set cubic-bezier anim parameter.
 * Parameters come from https://easings.net/
 *
 * Usage:
 *
 * lv_anim_t a;
 * lv_anim_init(&a);
 * ...
 * lv_anim_set_path_cb(&a, lv_anim_path_custom_bezier3);
 * LV_ANIM_SET_EASE_IN_SINE(&a); //Set cubic-bezier anim parameter to easeInSine
 * ...
 * lv_anim_start(&a);
 */

#define _PARA(a, x1, y1, x2, y2) ((a)->parameter.bezier3 =                                  \
(lv_anim_bezier3_para_t) {                      \
    LV_BEZIER_VAL_FLOAT(x1), LV_BEZIER_VAL_FLOAT(y1),   \
    LV_BEZIER_VAL_FLOAT(x2), LV_BEZIER_VAL_FLOAT(y2) }  \
                                 )

#define LV_ANIM_SET_EASE_IN_SINE(a) _PARA(a, 0.12, 0, 0.39, 0)
#define LV_ANIM_SET_EASE_OUT_SINE(a) _PARA(a, 0.61, 1, 0.88, 1)
#define LV_ANIM_SET_EASE_IN_OUT_SINE(a) _PARA(a, 0.37, 0, 0.63, 1)
#define LV_ANIM_SET_EASE_IN_QUAD(a) _PARA(a, 0.11, 0, 0.5, 0)
#define LV_ANIM_SET_EASE_OUT_QUAD(a) _PARA(a, 0.5, 1, 0.89, 1)
#define LV_ANIM_SET_EASE_IN_OUT_QUAD(a) _PARA(a, 0.45, 0, 0.55, 1)
#define LV_ANIM_SET_EASE_IN_CUBIC(a) _PARA(a, 0.32, 0, 0.67, 0)
#define LV_ANIM_SET_EASE_OUT_CUBIC(a) _PARA(a, 0.33, 1, 0.68, 1)
#define LV_ANIM_SET_EASE_IN_OUT_CUBIC(a) _PARA(a, 0.65, 0, 0.35, 1)
#define LV_ANIM_SET_EASE_IN_QUART(a) _PARA(a, 0.5, 0, 0.75, 0)
#define LV_ANIM_SET_EASE_OUT_QUART(a) _PARA(a, 0.25, 1, 0.5, 1)
#define LV_ANIM_SET_EASE_IN_OUT_QUART(a) _PARA(a, 0.76, 0, 0.24, 1)
#define LV_ANIM_SET_EASE_IN_QUINT(a) _PARA(a, 0.64, 0, 0.78, 0)
#define LV_ANIM_SET_EASE_OUT_QUINT(a) _PARA(a, 0.22, 1, 0.36, 1)
#define LV_ANIM_SET_EASE_IN_OUT_QUINT(a) _PARA(a, 0.83, 0, 0.17, 1)
#define LV_ANIM_SET_EASE_IN_EXPO(a) _PARA(a, 0.7, 0, 0.84, 0)
#define LV_ANIM_SET_EASE_OUT_EXPO(a) _PARA(a, 0.16, 1, 0.3, 1)
#define LV_ANIM_SET_EASE_IN_OUT_EXPO(a) _PARA(a, 0.87, 0, 0.13, 1)
#define LV_ANIM_SET_EASE_IN_CIRC(a) _PARA(a, 0.55, 0, 1, 0.45)
#define LV_ANIM_SET_EASE_OUT_CIRC(a) _PARA(a, 0, 0.55, 0.45, 1)
#define LV_ANIM_SET_EASE_IN_OUT_CIRC(a) _PARA(a, 0.85, 0, 0.15, 1)
#define LV_ANIM_SET_EASE_IN_BACK(a) _PARA(a, 0.36, 0, 0.66, -0.56)
#define LV_ANIM_SET_EASE_OUT_BACK(a) _PARA(a, 0.34, 1.56, 0.64, 1)
#define LV_ANIM_SET_EASE_IN_OUT_BACK(a) _PARA(a, 0.68, -0.6, 0.32, 1.6)

LV_EXPORT_CONST_INT(LV_ANIM_REPEAT_INFINITE);
LV_EXPORT_CONST_INT(LV_ANIM_PLAYTIME_INFINITE);

/**********************
 *      TYPEDEFS
 **********************/

/** Can be used to indicate if animations are enabled or disabled in a case*/
typedef enum {
    LV_ANIM_OFF,
    LV_ANIM_ON,
} lv_anim_enable_t;

/** Get the current value during an animation*/
typedef int32_t (*lv_anim_path_cb_t)(const lv_anim_t *);

/** Generic prototype of "animator" functions.
 * First parameter is the variable to animate.
 * Second parameter is the value to set.
 * Compatible with `lv_xxx_set_yyy(obj, value)` functions
 * The `x` in `_xcb_t` means it's not a fully generic prototype because
 * it doesn't receive `lv_anim_t *` as its first argument*/
typedef void (*lv_anim_exec_xcb_t)(void *, int32_t);

/** Same as `lv_anim_exec_xcb_t` but receives `lv_anim_t *` as the first parameter.
 * It's more consistent but less convenient. Might be used by binding generator functions.*/
typedef void (*lv_anim_custom_exec_cb_t)(lv_anim_t *, int32_t);

/** Callback to call when the animation is ready*/
typedef void (*lv_anim_completed_cb_t)(lv_anim_t *);

/** Callback to call when the animation really stars (considering `delay`)*/
typedef void (*lv_anim_start_cb_t)(lv_anim_t *);

/** Callback used when the animation values are relative to get the current value*/
typedef int32_t (*lv_anim_get_value_cb_t)(lv_anim_t *);

/** Callback used when the animation is deleted*/
typedef void (*lv_anim_deleted_cb_t)(lv_anim_t *);

/** Parameter used when path is custom_bezier */
typedef struct {
    int16_t x1;
    int16_t y1;
    int16_t x2;
    int16_t y2;
} lv_anim_bezier3_para_t;

/** Describes an animation*/
struct lv_anim_t {
    void * var;                               /**< Variable to animate*/
    lv_anim_exec_xcb_t exec_cb;               /**< Function to execute to animate*/
    lv_anim_custom_exec_cb_t custom_exec_cb;  /**< Function to execute to animate,
                                               * same purpose as exec_cb but different parameters*/
    lv_anim_start_cb_t start_cb;              /**< Call it when the animation is starts (considering `delay`)*/
    lv_anim_completed_cb_t completed_cb;      /**< Call it when the animation is fully completed*/
    lv_anim_deleted_cb_t deleted_cb;          /**< Call it when the animation is deleted*/
    lv_anim_get_value_cb_t get_value_cb;      /**< Get the current value in relative mode*/
    void * user_data;                         /**< Custom user data*/
    lv_anim_path_cb_t path_cb;                /**< Describe the path (curve) of animations*/
    int32_t start_value;                      /**< Start value*/
    int32_t current_value;                    /**< Current value*/
    int32_t end_value;                        /**< End value*/
    int32_t duration;                         /**< Animation time in ms*/
    int32_t act_time;                         /**< Current time in animation. Set to negative to make delay.*/
    uint32_t playback_delay;                  /**< Wait before play back*/
    uint32_t playback_duration;               /**< Duration of playback animation*/
    uint32_t repeat_delay;                    /**< Wait before repeat*/
    uint32_t repeat_cnt;                      /**< Repeat count for the animation*/
    union lv_anim_path_para_t {
        lv_anim_bezier3_para_t bezier3;       /**< Parameter used when path is custom_bezier*/
    } parameter;

    /* Animation system use these - user shouldn't set */
    uint32_t last_timer_run;
    uint8_t playback_now : 1;     /**< Play back is in progress*/
    uint8_t run_round : 1;        /**< Indicates the animation has run in this round*/
    uint8_t start_cb_called : 1;  /**< Indicates that the `start_cb` was already called*/
    uint8_t early_apply  : 1;     /**< 1: Apply start value immediately even is there is `delay`*/
};

/**********************
 * GLOBAL PROTOTYPES
 **********************/

/**
 * Initialize an animation variable.
 * E.g.:
 * lv_anim_t a;
 * lv_anim_init(&a);
 * lv_anim_set_...(&a);
 * lv_anim_start(&a);
 * @param a     pointer to an `lv_anim_t` variable to initialize
 */
void lv_anim_init(lv_anim_t * a);

/**
 * Set a variable to animate
 * @param a     pointer to an initialized `lv_anim_t` variable
 * @param var   pointer to a variable to animate
 */
void lv_anim_set_var(lv_anim_t * a, void * var);

/**
 * Set a function to animate `var`
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param exec_cb   a function to execute during animation
 *                  LVGL's built-in functions can be used.
 *                  E.g. lv_obj_set_x
 */
void lv_anim_set_exec_cb(lv_anim_t * a, lv_anim_exec_xcb_t exec_cb);

/**
 * Set the duration of an animation
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param duration  duration of the animation in milliseconds
 */
void lv_anim_set_duration(lv_anim_t * a, uint32_t duration);

/**
 * Legacy `lv_anim_set_time` API will be removed soon, use `lv_anim_set_duration` instead.
 */
void lv_anim_set_time(lv_anim_t * a, uint32_t duration);

/**
 * Set a delay before starting the animation
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param delay     delay before the animation in milliseconds
 */
void lv_anim_set_delay(lv_anim_t * a, uint32_t delay);

/**
 * Set the start and end values of an animation
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param start     the start value
 * @param end       the end value
 */
void lv_anim_set_values(lv_anim_t * a, int32_t start, int32_t end);

/**
 * Similar to `lv_anim_set_exec_cb` but `lv_anim_custom_exec_cb_t` receives
 * `lv_anim_t * ` as its first parameter instead of `void *`.
 * This function might be used when LVGL is bound to other languages because
 * it's more consistent to have `lv_anim_t *` as first parameter.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param exec_cb   a function to execute.
 */
void lv_anim_set_custom_exec_cb(lv_anim_t * a, lv_anim_custom_exec_cb_t exec_cb);

/**
 * Set the path (curve) of the animation.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param path_cb a function to set the current value of the animation.
 */
void lv_anim_set_path_cb(lv_anim_t * a, lv_anim_path_cb_t path_cb);

/**
 * Set a function call when the animation really starts (considering `delay`)
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param start_cb  a function call when the animation starts
 */
void lv_anim_set_start_cb(lv_anim_t * a, lv_anim_start_cb_t start_cb);

/**
 * Set a function to use the current value of the variable and make start and end value
 * relative to the returned current value.
 * @param a             pointer to an initialized `lv_anim_t` variable
 * @param get_value_cb  a function call when the animation starts
 */
void lv_anim_set_get_value_cb(lv_anim_t * a, lv_anim_get_value_cb_t get_value_cb);

/**
 * Set a function call when the animation is completed
 * @param a             pointer to an initialized `lv_anim_t` variable
 * @param completed_cb  a function call when the animation is fully completed
 */
void lv_anim_set_completed_cb(lv_anim_t * a, lv_anim_completed_cb_t completed_cb);

/**
 * Set a function call when the animation is deleted.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param deleted_cb  a function call when the animation is deleted
 */
void lv_anim_set_deleted_cb(lv_anim_t * a, lv_anim_deleted_cb_t deleted_cb);

/**
 * Make the animation to play back to when the forward direction is ready
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param duration  duration of playback animation in milliseconds. 0: disable playback
 */
void lv_anim_set_playback_duration(lv_anim_t * a, uint32_t duration);

/**
 * Legacy `lv_anim_set_playback_time` API will be removed soon, use `lv_anim_set_playback_duration` instead.
 */
void lv_anim_set_playback_time(lv_anim_t * a, uint32_t duration);

/**
 * Make the animation to play back to when the forward direction is ready
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param delay     delay in milliseconds before starting the playback animation.
 */
void lv_anim_set_playback_delay(lv_anim_t * a, uint32_t delay);

/**
 * Make the animation repeat itself.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param cnt       repeat count or `LV_ANIM_REPEAT_INFINITE` for infinite repetition. 0: to disable repetition.
 */
void lv_anim_set_repeat_count(lv_anim_t * a, uint32_t cnt);

/**
 * Set a delay before repeating the animation.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param delay     delay in milliseconds before repeating the animation.
 */
void lv_anim_set_repeat_delay(lv_anim_t * a, uint32_t delay);

/**
 * Set a whether the animation's should be applied immediately or only when the delay expired.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param en        true: apply the start value immediately in `lv_anim_start`;
 *                  false: apply the start value only when `delay` ms is elapsed and the animations really starts
 */
void lv_anim_set_early_apply(lv_anim_t * a, bool en);

/**
 * Set the custom user data field of the animation.
 * @param a           pointer to an initialized `lv_anim_t` variable
 * @param user_data   pointer to the new user_data.
 */
void lv_anim_set_user_data(lv_anim_t * a, void * user_data);

/**
 * Set parameter for cubic bezier path
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @param x1        first control point X
 * @param y1        first control point Y
 * @param x2        second control point X
 * @param y2        second control point Y
 */
void lv_anim_set_bezier3_param(lv_anim_t * a, int16_t x1, int16_t y1, int16_t x2, int16_t y2);

/**
 * Create an animation
 * @param a         an initialized 'anim_t' variable. Not required after call.
 * @return          pointer to the created animation (different from the `a` parameter)
 */
lv_anim_t * lv_anim_start(const lv_anim_t * a);

/**
 * Get a delay before starting the animation
 * @param a pointer to an initialized `lv_anim_t` variable
 * @return delay before the animation in milliseconds
 */
uint32_t lv_anim_get_delay(const lv_anim_t * a);

/**
 * Get the time used to play the animation.
 * @param a pointer to an animation.
 * @return the play time in milliseconds.
 */
uint32_t lv_anim_get_playtime(const lv_anim_t * a);

/**
 * Get the duration of an animation
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @return the duration of the animation in milliseconds
 */
uint32_t lv_anim_get_time(const lv_anim_t * a);

/**
 * Get the repeat count of the animation.
 * @param a         pointer to an initialized `lv_anim_t` variable
 * @return the repeat count or `LV_ANIM_REPEAT_INFINITE` for infinite repetition. 0: disabled repetition.
 */
uint32_t lv_anim_get_repeat_count(const lv_anim_t * a);

/**
 * Get the user_data field of the animation
 * @param   a pointer to an initialized `lv_anim_t` variable
 * @return  the pointer to the custom user_data of the animation
 */
void * lv_anim_get_user_data(const lv_anim_t * a);

/**
 * Delete animation(s) of a variable with a given animator function
 * @param var       pointer to variable
 * @param exec_cb   a function pointer which is animating 'var',
 *                  or NULL to ignore it and delete all the animations of 'var
 * @return          true: at least 1 animation is deleted, false: no animation is deleted
 */
bool lv_anim_delete(void * var, lv_anim_exec_xcb_t exec_cb);

/**
 * Delete all the animations
 */
void lv_anim_delete_all(void);

/**
 * Get the animation of a variable and its `exec_cb`.
 * @param var       pointer to variable
 * @param exec_cb   a function pointer which is animating 'var', or NULL to return first matching 'var'
 * @return          pointer to the animation.
 */
lv_anim_t * lv_anim_get(void * var, lv_anim_exec_xcb_t exec_cb);

/**
 * Get global animation refresher timer.
 * @return pointer to the animation refresher timer.
 */
lv_timer_t * lv_anim_get_timer(void);

/**
 * Delete an animation by getting the animated variable from `a`.
 * Only animations with `exec_cb` will be deleted.
 * This function exists because it's logical that all anim. functions receives an
 * `lv_anim_t` as their first parameter. It's not practical in C but might make
 * the API more consequent and makes easier to generate bindings.
 * @param a         pointer to an animation.
 * @param exec_cb   a function pointer which is animating 'var',
 *                  or NULL to ignore it and delete all the animations of 'var
 * @return          true: at least 1 animation is deleted, false: no animation is deleted
 */
bool lv_anim_custom_delete(lv_anim_t * a, lv_anim_custom_exec_cb_t exec_cb);

/**
 * Get the animation of a variable and its `exec_cb`.
 * This function exists because it's logical that all anim. functions receives an
 * `lv_anim_t` as their first parameter. It's not practical in C but might make
 * the API more consequent and makes easier to generate bindings.
 * @param a         pointer to an animation.
 * @param exec_cb   a function pointer which is animating 'var', or NULL to return first matching 'var'
 * @return          pointer to the animation.
 */
lv_anim_t * lv_anim_custom_get(lv_anim_t * a, lv_anim_custom_exec_cb_t exec_cb);

/**
 * Get the number of currently running animations
 * @return      the number of running animations
 */
uint16_t lv_anim_count_running(void);

/**
 * Store the speed as a special value which can be used as time in animations.
 * It will be converted to time internally based on the start and end values
 * @param speed         the speed of the animation in with unit / sec resolution in 0..10k range
 * @return              a special value which can be used as an animation time
 */
uint32_t lv_anim_speed(uint32_t speed);

/**
 * Store the speed as a special value which can be used as time in animations.
 * It will be converted to time internally based on the start and end values
 * @param speed         the speed of the animation in as unit / sec resolution in 0..10k range
 * @param min_time      the minimum time in 0..10k range
 * @param max_time      the maximum time in 0..10k range
 * @return              a special value in where all three values are stored and can be used as an animation time
 * @note                internally speed is stored as 10 unit/sec
 * @note                internally min/max_time are stored with 10 ms unit
 *
 */
uint32_t lv_anim_speed_clamped(uint32_t speed, uint32_t min_time, uint32_t max_time);

/**
 * Calculate the time of an animation based on its speed, start and end values.
 * @param speed         the speed of the animation
 * @param start         the start value
 * @param end           the end value
 * @return              the time of the animation in milliseconds
 */
uint32_t lv_anim_speed_to_time(uint32_t speed, int32_t start, int32_t end);

/**
 * Manually refresh the state of the animations.
 * Useful to make the animations running in a blocking process where
 * `lv_timer_handler` can't run for a while.
 * Shouldn't be used directly because it is called in `lv_refr_now()`.
 */
void lv_anim_refr_now(void);

/**
 * Calculate the current value of an animation applying linear characteristic
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_linear(const lv_anim_t * a);

/**
 * Calculate the current value of an animation slowing down the start phase
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_ease_in(const lv_anim_t * a);

/**
 * Calculate the current value of an animation slowing down the end phase
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_ease_out(const lv_anim_t * a);

/**
 * Calculate the current value of an animation applying an "S" characteristic (cosine)
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_ease_in_out(const lv_anim_t * a);

/**
 * Calculate the current value of an animation with overshoot at the end
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_overshoot(const lv_anim_t * a);

/**
 * Calculate the current value of an animation with 3 bounces
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_bounce(const lv_anim_t * a);

/**
 * Calculate the current value of an animation applying step characteristic.
 * (Set end value on the end of the animation)
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_step(const lv_anim_t * a);

/**
 * A custom cubic bezier animation path, need to specify cubic-parameters in a->parameter.bezier3
 * @param a     pointer to an animation
 * @return      the current value to set
 */
int32_t lv_anim_path_custom_bezier3(const lv_anim_t * a);

/**********************
 *   GLOBAL VARIABLES
 **********************/

/**********************
 *      MACROS
 **********************/

#ifdef __cplusplus
} /*extern "C"*/
#endif

#endif /*LV_ANIM_H*/
