/**
 * @file lv_hal_disp.h
 *
 * @description Display Driver HAL interface header file
 *
 */

#ifndef LV_HAL_DISP_H
#define LV_HAL_DISP_H

#ifdef __cplusplus
extern "C" {
#endif

/*********************
 *      INCLUDES
 *********************/
#include <stdint.h>
#include <stdbool.h>
#include "lv_hal.h"
#include "../lv_misc/lv_color.h"
#include "../lv_misc/lv_area.h"
#include "../lv_misc/lv_ll.h"
#include "../lv_misc/lv_task.h"

/*********************
 *      DEFINES
 *********************/
#ifndef LV_INV_BUF_SIZE
#define LV_INV_BUF_SIZE 32 /*Buffer size for invalid areas */
#endif

#ifndef LV_ATTRIBUTE_FLUSH_READY
#define LV_ATTRIBUTE_FLUSH_READY
#endif

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

struct _disp_t;
struct _disp_drv_t;

/**
 * Structure for holding display buffer information.
 */
typedef struct {
    void * buf1; /**< First display buffer. */
    void * buf2; /**< Second display buffer. */

    /*Internal, used by the library*/
    void * buf_act;
    uint32_t size; /*In pixel count*/
    lv_area_t area;
    volatile int
    flushing;      /*1: flushing is in progress. (It can't be a bitfield because when it's cleared from IRQ Read-Modify-Write issue might occur)*/
    volatile int
    flushing_last; /*1: It was the last chunk to flush. (It can't be a bitfield because when it's cleared from IRQ Read-Modify-Write issue might occur)*/
    volatile uint32_t last_area         : 1; /*1: the last area is being rendered*/
    volatile uint32_t last_part         : 1; /*1: the last part of the current area is being rendered*/
} lv_disp_buf_t;

/**
 * Display Driver structure to be registered by HAL
 */
typedef struct _disp_drv_t {

    lv_coord_t hor_res; /**< Horizontal resolution. */
    lv_coord_t ver_res; /**< Vertical resolution. */

    /** Pointer to a buffer initialized with `lv_disp_buf_init()`.
     * LVGL will use this buffer(s) to draw the screens contents */
    lv_disp_buf_t * buffer;

#if LV_ANTIALIAS
    uint32_t antialiasing : 1; /**< 1: antialiasing is enabled on this display. */
#endif
    uint32_t rotated : 1; /**< 1: turn the display by 90 degree. @warning Does not update coordinates for you!*/

#if LV_COLOR_SCREEN_TRANSP
    /**Handle if the the screen doesn't have a solid (opa == LV_OPA_COVER) background.
     * Use only if required because it's slower.*/
    uint32_t screen_transp : 1;
#endif

    /** DPI (dot per inch) of the display.
     * Set to `LV_DPI` from `lv_Conf.h` by default.
     */
    uint32_t dpi : 10;

    /** MANDATORY: Write the internal buffer (VDB) to the display. 'lv_disp_flush_ready()' has to be
     * called when finished */
    void (*flush_cb)(struct _disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p);

    /** OPTIONAL: Extend the invalidated areas to match with the display drivers requirements
     * E.g. round `y` to, 8, 16 ..) on a monochrome display*/
    void (*rounder_cb)(struct _disp_drv_t * disp_drv, lv_area_t * area);

    /** OPTIONAL: Set a pixel in a buffer according to the special requirements of the display
     * Can be used for color format not supported in LittelvGL. E.g. 2 bit -> 4 gray scales
     * @note Much slower then drawing with supported color formats. */
    void (*set_px_cb)(struct _disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
                      lv_color_t color, lv_opa_t opa);

    /** OPTIONAL: Called after every refresh cycle to tell the rendering and flushing time + the
     * number of flushed pixels */
    void (*monitor_cb)(struct _disp_drv_t * disp_drv, uint32_t time, uint32_t px);

    /** OPTIONAL: Called periodically while lvgl waits for operation to be completed.
     * For example flushing or GPU
     * User can execute very simple tasks here or yield the task */
    void (*wait_cb)(struct _disp_drv_t * disp_drv);

#if LV_USE_GPU
    /** OPTIONAL: Blend two memories using opacity (GPU only)*/
    void (*gpu_blend_cb)(struct _disp_drv_t * disp_drv, lv_color_t * dest, const lv_color_t * src, uint32_t length,
                         lv_opa_t opa);

    /** OPTIONAL: Fill a memory with a color (GPU only)*/
    void (*gpu_fill_cb)(struct _disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,
                        const lv_area_t * fill_area, lv_color_t color);
#endif

    /** On CHROMA_KEYED images this color will be transparent.
     * `LV_COLOR_TRANSP` by default. (lv_conf.h)*/
    lv_color_t color_chroma_key;

#if LV_USE_USER_DATA
    lv_disp_drv_user_data_t user_data; /**< Custom display driver user data */
#endif

} lv_disp_drv_t;

struct _lv_obj_t;

/**
 * Display structure.
 * @note `lv_disp_drv_t` should be the first member of the structure.
 */
typedef struct _disp_t {
    /**< Driver to the display*/
    lv_disp_drv_t driver;

    /**< A task which periodically checks the dirty areas and refreshes them*/
    lv_task_t * refr_task;

    /** Screens of the display*/
    lv_ll_t scr_ll;
    struct _lv_obj_t * act_scr; /**< Currently active screen on this display */
    struct _lv_obj_t * top_layer; /**< @see lv_disp_get_layer_top */
    struct _lv_obj_t * sys_layer; /**< @see lv_disp_get_layer_sys */

    /** Invalidated (marked to redraw) areas*/
    lv_area_t inv_areas[LV_INV_BUF_SIZE];
    uint8_t inv_area_joined[LV_INV_BUF_SIZE];
    uint32_t inv_p : 10;

    /*Miscellaneous data*/
    uint32_t last_activity_time; /**< Last time there was activity on this display */
} lv_disp_t;


typedef enum {
    LV_DISP_SIZE_SMALL,
    LV_DISP_SIZE_MEDIUM,
    LV_DISP_SIZE_LARGE,
    LV_DISP_SIZE_EXTRA_LARGE,
} lv_disp_size_t;

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

/**
 * Initialize a display driver with default values.
 * It is used to have known values in the fields and not junk in memory.
 * After it you can safely set only the fields you need.
 * @param driver pointer to driver variable to initialize
 */
void lv_disp_drv_init(lv_disp_drv_t * driver);

/**
 * Initialize a display buffer
 * @param disp_buf pointer `lv_disp_buf_t` variable to initialize
 * @param buf1 A buffer to be used by LVGL to draw the image.
 *             Always has to specified and can't be NULL.
 *             Can be an array allocated by the user. E.g. `static lv_color_t disp_buf1[1024 * 10]`
 *             Or a memory address e.g. in external SRAM
 * @param buf2 Optionally specify a second buffer to make image rendering and image flushing
 *             (sending to the display) parallel.
 *             In the `disp_drv->flush` you should use DMA or similar hardware to send
 *             the image to the display in the background.
 *             It lets LVGL to render next frame into the other buffer while previous is being
 * sent. Set to `NULL` if unused.
 * @param size_in_px_cnt size of the `buf1` and `buf2` in pixel count.
 */
void lv_disp_buf_init(lv_disp_buf_t * disp_buf, void * buf1, void * buf2, uint32_t size_in_px_cnt);

/**
 * Register an initialized display driver.
 * Automatically set the first display as active.
 * @param driver pointer to an initialized 'lv_disp_drv_t' variable (can be local variable)
 * @return pointer to the new display or NULL on error
 */
lv_disp_t * lv_disp_drv_register(lv_disp_drv_t * driver);

/**
 * Update the driver in run time.
 * @param disp pointer to a display. (return value of `lv_disp_drv_register`)
 * @param new_drv pointer to the new driver
 */
void lv_disp_drv_update(lv_disp_t * disp, lv_disp_drv_t * new_drv);

/**
 * Remove a display
 * @param disp pointer to display
 */
void lv_disp_remove(lv_disp_t * disp);

/**
 * Set a default screen. The new screens will be created on it by default.
 * @param disp pointer to a display
 */
void lv_disp_set_default(lv_disp_t * disp);

/**
 * Get the default display
 * @return pointer to the default display
 */
lv_disp_t * lv_disp_get_default(void);

/**
 * Get the horizontal resolution of a display
 * @param disp pointer to a display (NULL to use the default display)
 * @return the horizontal resolution of the display
 */
lv_coord_t lv_disp_get_hor_res(lv_disp_t * disp);

/**
 * Get the vertical resolution of a display
 * @param disp pointer to a display (NULL to use the default display)
 * @return the vertical resolution of the display
 */
lv_coord_t lv_disp_get_ver_res(lv_disp_t * disp);

/**
 * Get if anti-aliasing is enabled for a display or not
 * @param disp pointer to a display (NULL to use the default display)
 * @return true: anti-aliasing is enabled; false: disabled
 */
bool lv_disp_get_antialiasing(lv_disp_t * disp);

/**
 * Get the DPI of the display
 * @param disp pointer to a display (NULL to use the default display)
 * @return dpi of the display
 */
uint32_t lv_disp_get_dpi(lv_disp_t * disp);

/**
 * Get the size category of the display based on it's hor. res. and dpi.
 * @param disp pointer to a display (NULL to use the default display)
 * @return LV_DISP_SIZE_SMALL/MEDIUM/LARGE/EXTRA_LARGE
 */
lv_disp_size_t lv_disp_get_size_category(lv_disp_t * disp);

//! @cond Doxygen_Suppress

/**
 * Call in the display driver's `flush_cb` function when the flushing is finished
 * @param disp_drv pointer to display driver in `flush_cb` where this function is called
 */
LV_ATTRIBUTE_FLUSH_READY void lv_disp_flush_ready(lv_disp_drv_t * disp_drv);

/**
 * Tell if it's the last area of the refreshing process.
 * Can be called from `flush_cb` to execute some special display refreshing if needed when all areas area flushed.
 * @param disp_drv pointer to display driver
 * @return true: it's the last area to flush; false: there are other areas too which will be refreshed soon
 */
LV_ATTRIBUTE_FLUSH_READY bool lv_disp_flush_is_last(lv_disp_drv_t * disp_drv);

//! @endcond

/**
 * Get the next display.
 * @param disp pointer to the current display. NULL to initialize.
 * @return the next display or NULL if no more. Give the first display when the parameter is NULL
 */
lv_disp_t * lv_disp_get_next(lv_disp_t * disp);

/**
 * Get the internal buffer of a display
 * @param disp pointer to a display
 * @return pointer to the internal buffers
 */
lv_disp_buf_t * lv_disp_get_buf(lv_disp_t * disp);

/**
 * Get the number of areas in the buffer
 * @return number of invalid areas
 */
uint16_t lv_disp_get_inv_buf_size(lv_disp_t * disp);

/**
 * Pop (delete) the last 'num' invalidated areas from the buffer
 * @param num number of areas to delete
 */
void _lv_disp_pop_from_inv_buf(lv_disp_t * disp, uint16_t num);

/**
 * Check the driver configuration if it's double buffered (both `buf1` and `buf2` are set)
 * @param disp pointer to to display to check
 * @return true: double buffered; false: not double buffered
 */
bool lv_disp_is_double_buf(lv_disp_t * disp);

/**
 * Check the driver configuration if it's TRUE double buffered (both `buf1` and `buf2` are set and
 * `size` is screen sized)
 * @param disp pointer to to display to check
 * @return true: double buffered; false: not double buffered
 */
bool lv_disp_is_true_double_buf(lv_disp_t * disp);

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

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

#endif
