#include "lvgl.h"
#include "sdl_drivers/sdl_driver.h"

/**********************
 *   STATIC FUNCTIONS
 **********************/

static int tick_thread(void *data);

/**
 * Initialize the Hardware Abstraction Layer (HAL) for the LVGL graphics
 * library
 */
void hal_init(void) {
    /* Use the 'monitor' driver which creates window on PC's monitor to simulate a display*/
    sdl_init();
    /* Tick init.
     * You have to call 'lv_tick_inc()' in periodically to inform LittelvGL about
     * how much time were elapsed Create an SDL thread to do this*/
    SDL_CreateThread(tick_thread, "tick", NULL);

    /*Create a display buffer*/
    static lv_disp_draw_buf_t disp_buf1;
    static lv_color_t         buf1_1[SDL_HOR_RES * 100];
    static lv_color_t         buf1_2[SDL_HOR_RES * 100];
    lv_disp_draw_buf_init(&disp_buf1, buf1_1, buf1_2, SDL_HOR_RES * 100);

    /*Create a display*/
    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv); /*Basic initialization*/
    disp_drv.draw_buf     = &disp_buf1;
    disp_drv.flush_cb     = monitor_flush;
    disp_drv.hor_res      = SDL_HOR_RES;
    disp_drv.ver_res      = SDL_VER_RES;
    disp_drv.antialiasing = 1;

    lv_disp_t *disp       = lv_disp_drv_register(&disp_drv);

    lv_theme_t *th = lv_theme_mono_init(disp, false, &lv_font_montserrat_12);
    lv_disp_set_theme(disp, th);

    lv_group_t *g = lv_group_create();
    lv_group_set_default(g);

    /* Add the mouse as input device
     * Use the 'mouse' driver which reads the PC's mouse*/
    static lv_indev_drv_t indev_drv_1;
    lv_indev_drv_init(&indev_drv_1); /*Basic initialization*/
    indev_drv_1.type = LV_INDEV_TYPE_POINTER;

    /*This function will be called periodically (by the library) to get the mouse position and state*/
    indev_drv_1.read_cb     = sdl_mouse_read;
    lv_indev_t *mouse_indev = lv_indev_drv_register(&indev_drv_1);

    static lv_indev_drv_t indev_drv_2;
    lv_indev_drv_init(&indev_drv_2); /*Basic initialization*/
    indev_drv_2.type     = LV_INDEV_TYPE_KEYPAD;
    indev_drv_2.read_cb  = sdl_keyboard_read;
    lv_indev_t *kb_indev = lv_indev_drv_register(&indev_drv_2);
    lv_indev_set_group(kb_indev, g);

    static lv_indev_drv_t indev_drv_3;
    lv_indev_drv_init(&indev_drv_3); /*Basic initialization*/
    indev_drv_3.type      = LV_INDEV_TYPE_ENCODER;
    indev_drv_3.read_cb   = sdl_mousewheel_read;

    lv_indev_t *enc_indev = lv_indev_drv_register(&indev_drv_3);
    lv_indev_set_group(enc_indev, g);

    /*Set a cursor for the mouse*/
    LV_IMG_DECLARE(mouse_cursor_icon);                  /*Declare the image file.*/
    lv_obj_t *cursor_obj = lv_img_create(lv_scr_act()); /*Create an image object for the cursor */
    lv_img_set_src(cursor_obj, &mouse_cursor_icon);     /*Set the image source*/
    lv_indev_set_cursor(mouse_indev, cursor_obj);       /*Connect the image  object to the driver*/
}

/**
 * A task to measure the elapsed time for LVGL
 * @param data unused
 * @return never return
 */
static int tick_thread(void *data) {
    (void)data;

    while (1) {
        SDL_Delay(5);
        lv_tick_inc(5); /*Tell LittelvGL that 5 milliseconds were elapsed*/
    }

    return 0;
}