/**
 * @file lv_label.c
 *
 */

/*********************
 *      INCLUDES
 *********************/
#include "lv_label.h"
#if LV_USE_LABEL != 0
#include "../core/lv_obj.h"
#include "../misc/lv_assert.h"
#include "../core/lv_group.h"
#include "../draw/lv_draw.h"
#include "../misc/lv_color.h"
#include "../misc/lv_math.h"
#include "../misc/lv_bidi.h"
#include "../misc/lv_txt_ap.h"
#include "../misc/lv_printf.h"

/*********************
 *      DEFINES
 *********************/
#define MY_CLASS &lv_label_class

#define LV_LABEL_DEF_SCROLL_SPEED   (lv_disp_get_dpi(lv_obj_get_disp(obj)) / 3)
#define LV_LABEL_SCROLL_DELAY       300
#define LV_LABEL_DOT_END_INV 0xFFFFFFFF
#define LV_LABEL_HINT_HEIGHT_LIMIT 1024 /*Enable "hint" to buffer info about labels larger than this. (Speed up drawing)*/

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

/**********************
 *  STATIC PROTOTYPES
 **********************/
static void lv_label_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_label_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_label_event(const lv_obj_class_t * class_p, lv_event_t * e);
static void draw_main(lv_event_t * e);

static void lv_label_refr_text(lv_obj_t * obj);
static void lv_label_revert_dots(lv_obj_t * label);

static bool lv_label_set_dot_tmp(lv_obj_t * label, char * data, uint32_t len);
static char * lv_label_get_dot_tmp(lv_obj_t * label);
static void lv_label_dot_tmp_free(lv_obj_t * label);
static void set_ofs_x_anim(void * obj, int32_t v);
static void set_ofs_y_anim(void * obj, int32_t v);

/**********************
 *  STATIC VARIABLES
 **********************/
const lv_obj_class_t lv_label_class = {
    .constructor_cb = lv_label_constructor,
    .destructor_cb = lv_label_destructor,
    .event_cb = lv_label_event,
    .width_def = LV_SIZE_CONTENT,
    .height_def = LV_SIZE_CONTENT,
    .instance_size = sizeof(lv_label_t),
    .base_class = &lv_obj_class
};

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

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

lv_obj_t * lv_label_create(lv_obj_t * parent)
{
    LV_LOG_INFO("begin");
    lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
    lv_obj_class_init_obj(obj);
    return obj;
}

/*=====================
 * Setter functions
 *====================*/

void lv_label_set_text(lv_obj_t * obj, const char * text)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    lv_label_t * label = (lv_label_t *)obj;

    lv_obj_invalidate(obj);

    /*If text is NULL then just refresh with the current text*/
    if(text == NULL) text = label->text;

    if(label->text == text && label->static_txt == 0) {
        /*If set its own text then reallocate it (maybe its size changed)*/
#if LV_USE_ARABIC_PERSIAN_CHARS
        /*Get the size of the text and process it*/
        size_t len = _lv_txt_ap_calc_bytes_cnt(text);

        label->text = lv_mem_realloc(label->text, len);
        LV_ASSERT_MALLOC(label->text);
        if(label->text == NULL) return;

        _lv_txt_ap_proc(label->text, label->text);
#else
        label->text = lv_mem_realloc(label->text, strlen(label->text) + 1);
#endif

        LV_ASSERT_MALLOC(label->text);
        if(label->text == NULL) return;
    }
    else {
        /*Free the old text*/
        if(label->text != NULL && label->static_txt == 0) {
            lv_mem_free(label->text);
            label->text = NULL;
        }

#if LV_USE_ARABIC_PERSIAN_CHARS
        /*Get the size of the text and process it*/
        size_t len = _lv_txt_ap_calc_bytes_cnt(text);

        label->text = lv_mem_alloc(len);
        LV_ASSERT_MALLOC(label->text);
        if(label->text == NULL) return;

        _lv_txt_ap_proc(text, label->text);
#else
        /*Get the size of the text*/
        size_t len = strlen(text) + 1;

        /*Allocate space for the new text*/
        label->text = lv_mem_alloc(len);
        LV_ASSERT_MALLOC(label->text);
        if(label->text == NULL) return;
        strcpy(label->text, text);
#endif

        /*Now the text is dynamically allocated*/
        label->static_txt = 0;
    }

    lv_label_refr_text(obj);
}

void lv_label_set_text_fmt(lv_obj_t * obj, const char * fmt, ...)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    LV_ASSERT_NULL(fmt);

    lv_obj_invalidate(obj);
    lv_label_t * label = (lv_label_t *)obj;

    /*If text is NULL then refresh*/
    if(fmt == NULL) {
        lv_label_refr_text(obj);
        return;
    }

    if(label->text != NULL && label->static_txt == 0) {
        lv_mem_free(label->text);
        label->text = NULL;
    }

    va_list args;
    va_start(args, fmt);
    label->text = _lv_txt_set_text_vfmt(fmt, args);
    va_end(args);
    label->static_txt = 0; /*Now the text is dynamically allocated*/

    lv_label_refr_text(obj);
}

void lv_label_set_text_static(lv_obj_t * obj, const char * text)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    lv_label_t * label = (lv_label_t *)obj;

    if(label->static_txt == 0 && label->text != NULL) {
        lv_mem_free(label->text);
        label->text = NULL;
    }

    if(text != NULL) {
        label->static_txt = 1;
        label->text       = (char *)text;
    }

    lv_label_refr_text(obj);
}

void lv_label_set_long_mode(lv_obj_t * obj, lv_label_long_mode_t long_mode)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

    lv_label_t * label = (lv_label_t *)obj;

    /*Delete the old animation (if exists)*/
    lv_anim_del(obj, set_ofs_x_anim);
    lv_anim_del(obj, set_ofs_y_anim);
    label->offset.x = 0;
    label->offset.y = 0;

    if(long_mode == LV_LABEL_LONG_SCROLL || long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR || long_mode == LV_LABEL_LONG_CLIP)
        label->expand = 1;
    else
        label->expand = 0;

    /*Restore the character under the dots*/
    if(label->long_mode == LV_LABEL_LONG_DOT && label->dot_end != LV_LABEL_DOT_END_INV) {
        lv_label_revert_dots(obj);
    }

    label->long_mode = long_mode;
    lv_label_refr_text(obj);
}

void lv_label_set_recolor(lv_obj_t * obj, bool en)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

    lv_label_t * label = (lv_label_t *)obj;
    if(label->recolor == en) return;

    label->recolor = en == false ? 0 : 1;

    /*Refresh the text because the potential color codes in text needs to be hidden or revealed*/
    lv_label_refr_text(obj);
}

void lv_label_set_text_sel_start(lv_obj_t * obj, uint32_t index)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

#if LV_LABEL_TEXT_SELECTION
    lv_label_t * label = (lv_label_t *)obj;
    label->sel_start   = index;
    lv_obj_invalidate(obj);
#else
    LV_UNUSED(obj);    /*Unused*/
    LV_UNUSED(index);  /*Unused*/
#endif
}

void lv_label_set_text_sel_end(lv_obj_t * obj, uint32_t index)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

#if LV_LABEL_TEXT_SELECTION
    lv_label_t * label = (lv_label_t *)obj;
    label->sel_end     = index;
    lv_obj_invalidate(obj);
#else
    LV_UNUSED(obj);   /*Unused*/
    LV_UNUSED(index); /*Unused*/
#endif
}

/*=====================
 * Getter functions
 *====================*/

char * lv_label_get_text(const lv_obj_t * obj)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    lv_label_t * label = (lv_label_t *)obj;
    return label->text;
}

lv_label_long_mode_t lv_label_get_long_mode(const lv_obj_t * obj)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    lv_label_t * label = (lv_label_t *)obj;
    return label->long_mode;
}

bool lv_label_get_recolor(const lv_obj_t * obj)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

    lv_label_t * label = (lv_label_t *)obj;
    return label->recolor == 0 ? false : true;
}

void lv_label_get_letter_pos(const lv_obj_t * obj, uint32_t char_id, lv_point_t * pos)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    LV_ASSERT_NULL(pos);

    lv_label_t * label = (lv_label_t *)obj;
    const char * txt         = lv_label_get_text(obj);
    lv_text_align_t align = lv_obj_calculate_style_text_align(obj, LV_PART_MAIN, txt);

    if(txt[0] == '\0') {
        pos->y = 0;
        switch(align) {
            case LV_TEXT_ALIGN_LEFT:
                pos->x = 0;
                break;
            case LV_TEXT_ALIGN_RIGHT:
                pos->x = lv_obj_get_content_width(obj);
                break;
            case LV_TEXT_ALIGN_CENTER:
                pos->x = lv_obj_get_content_width(obj) / 2;
                break;
        }
        return;
    }

    lv_area_t txt_coords;
    lv_obj_get_content_coords(obj, &txt_coords);

    uint32_t line_start      = 0;
    uint32_t new_line_start  = 0;
    lv_coord_t max_w         = lv_area_get_width(&txt_coords);
    const lv_font_t * font   = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
    lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
    lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_MAIN);
    lv_coord_t letter_height    = lv_font_get_line_height(font);
    lv_coord_t y             = 0;
    lv_text_flag_t flag       = LV_TEXT_FLAG_NONE;

    if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
    if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;
    if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) flag |= LV_TEXT_FLAG_FIT;

    uint32_t byte_id = _lv_txt_encoded_get_byte_id(txt, char_id);

    /*Search the line of the index letter*/;
    while(txt[new_line_start] != '\0') {
        new_line_start += _lv_txt_get_next_line(&txt[line_start], font, letter_space, max_w, NULL, flag);
        if(byte_id < new_line_start || txt[new_line_start] == '\0')
            break; /*The line of 'index' letter begins at 'line_start'*/

        y += letter_height + line_space;
        line_start = new_line_start;
    }

    /*If the last character is line break then go to the next line*/
    if(byte_id > 0) {
        if((txt[byte_id - 1] == '\n' || txt[byte_id - 1] == '\r') && txt[byte_id] == '\0') {
            y += letter_height + line_space;
            line_start = byte_id;
        }
    }

    const char * bidi_txt;
    uint32_t visual_byte_pos;
#if LV_USE_BIDI
    lv_base_dir_t base_dir = lv_obj_get_style_base_dir(obj, LV_PART_MAIN);
    if(base_dir == LV_BASE_DIR_AUTO) base_dir = _lv_bidi_detect_base_dir(txt);

    char * mutable_bidi_txt = NULL;
    /*Handle Bidi*/
    if(new_line_start == byte_id) {
        visual_byte_pos = base_dir == LV_BASE_DIR_RTL ? 0 : byte_id - line_start;
        bidi_txt = &txt[line_start];
    }
    else {
        uint32_t line_char_id = _lv_txt_encoded_get_char_id(&txt[line_start], byte_id - line_start);

        bool is_rtl;
        uint32_t visual_char_pos = _lv_bidi_get_visual_pos(&txt[line_start], &mutable_bidi_txt, new_line_start - line_start,
                                                           base_dir, line_char_id, &is_rtl);
        bidi_txt = mutable_bidi_txt;
        if(is_rtl) visual_char_pos++;

        visual_byte_pos = _lv_txt_encoded_get_byte_id(bidi_txt, visual_char_pos);
    }
#else
    bidi_txt = &txt[line_start];
    visual_byte_pos = byte_id - line_start;
#endif

    /*Calculate the x coordinate*/
    lv_coord_t x = lv_txt_get_width(bidi_txt, visual_byte_pos, font, letter_space, flag);
    if(char_id != line_start) x += letter_space;

    if(align == LV_TEXT_ALIGN_CENTER) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(bidi_txt, new_line_start - line_start, font, letter_space, flag);
        x += lv_area_get_width(&txt_coords) / 2 - line_w / 2;

    }
    else if(align == LV_TEXT_ALIGN_RIGHT) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(bidi_txt, new_line_start - line_start, font, letter_space, flag);

        x += lv_area_get_width(&txt_coords) - line_w;
    }
    pos->x = x;
    pos->y = y;

#if LV_USE_BIDI
    if(mutable_bidi_txt) lv_mem_buf_release(mutable_bidi_txt);
#endif
}

uint32_t lv_label_get_letter_on(const lv_obj_t * obj, lv_point_t * pos_in)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    LV_ASSERT_NULL(pos_in);
    lv_label_t * label = (lv_label_t *)obj;

    lv_point_t pos;
    pos.x = pos_in->x - lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
    pos.y = pos_in->y - lv_obj_get_style_pad_top(obj, LV_PART_MAIN);

    lv_area_t txt_coords;
    lv_obj_get_content_coords(obj, &txt_coords);
    const char * txt         = lv_label_get_text(obj);
    uint32_t line_start      = 0;
    uint32_t new_line_start  = 0;
    lv_coord_t max_w         = lv_area_get_width(&txt_coords);
    const lv_font_t * font   = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
    lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
    lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_MAIN);
    lv_coord_t letter_height    = lv_font_get_line_height(font);
    lv_coord_t y             = 0;
    lv_text_flag_t flag       = LV_TEXT_FLAG_NONE;
    uint32_t logical_pos;
    char * bidi_txt;

    if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
    if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;
    if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) flag |= LV_TEXT_FLAG_FIT;

    lv_text_align_t align = lv_obj_calculate_style_text_align(obj, LV_PART_MAIN, label->text);

    /*Search the line of the index letter*/;
    while(txt[line_start] != '\0') {
        new_line_start += _lv_txt_get_next_line(&txt[line_start], font, letter_space, max_w, NULL, flag);

        if(pos.y <= y + letter_height) {
            /*The line is found (stored in 'line_start')*/
            /*Include the NULL terminator in the last line*/
            uint32_t tmp = new_line_start;
            uint32_t letter;
            letter = _lv_txt_encoded_prev(txt, &tmp);
            if(letter != '\n' && txt[new_line_start] == '\0') new_line_start++;
            break;
        }
        y += letter_height + line_space;

        line_start = new_line_start;
    }

#if LV_USE_BIDI
    bidi_txt = lv_mem_buf_get(new_line_start - line_start + 1);
    uint32_t txt_len = new_line_start - line_start;
    if(new_line_start > 0 && txt[new_line_start - 1] == '\0' && txt_len > 0) txt_len--;
    _lv_bidi_process_paragraph(txt + line_start, bidi_txt, txt_len, lv_obj_get_style_base_dir(obj, LV_PART_MAIN), NULL, 0);
#else
    bidi_txt = (char *)txt + line_start;
#endif

    /*Calculate the x coordinate*/
    lv_coord_t x = 0;
    if(align == LV_TEXT_ALIGN_CENTER) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(bidi_txt, new_line_start - line_start, font, letter_space, flag);
        x += lv_area_get_width(&txt_coords) / 2 - line_w / 2;
    }
    else if(align == LV_TEXT_ALIGN_RIGHT) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(bidi_txt, new_line_start - line_start, font, letter_space, flag);
        x += lv_area_get_width(&txt_coords) - line_w;
    }

    lv_text_cmd_state_t cmd_state = LV_TEXT_CMD_STATE_WAIT;

    uint32_t i = 0;
    uint32_t i_act = i;

    if(new_line_start > 0) {
        while(i + line_start < new_line_start) {
            /*Get the current letter and the next letter for kerning*/
            /*Be careful 'i' already points to the next character*/
            uint32_t letter;
            uint32_t letter_next;
            _lv_txt_encoded_letter_next_2(bidi_txt, &letter, &letter_next, &i);

            /*Handle the recolor command*/
            if((flag & LV_TEXT_FLAG_RECOLOR) != 0) {
                if(_lv_txt_is_cmd(&cmd_state, bidi_txt[i]) != false) {
                    continue; /*Skip the letter if it is part of a command*/
                }
            }

            lv_coord_t gw = lv_font_get_glyph_width(font, letter, letter_next);

            /*Finish if the x position or the last char of the next line is reached*/
            if(pos.x < x + gw || i + line_start == new_line_start ||  txt[i_act + line_start] == '\0') {
                i = i_act;
                break;
            }
            x += gw;
            x += letter_space;
            i_act = i;
        }
    }

#if LV_USE_BIDI
    /*Handle Bidi*/
    uint32_t cid = _lv_txt_encoded_get_char_id(bidi_txt, i);
    if(txt[line_start + i] == '\0') {
        logical_pos = i;
    }
    else {
        bool is_rtl;
        logical_pos = _lv_bidi_get_logical_pos(&txt[line_start], NULL,
                                               txt_len, lv_obj_get_style_base_dir(obj, LV_PART_MAIN), cid, &is_rtl);
        if(is_rtl) logical_pos++;
    }
    lv_mem_buf_release(bidi_txt);
#else
    logical_pos = _lv_txt_encoded_get_char_id(bidi_txt, i);
#endif

    return  logical_pos + _lv_txt_encoded_get_char_id(txt, line_start);
}

bool lv_label_is_char_under_pos(const lv_obj_t * obj, lv_point_t * pos)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    LV_ASSERT_NULL(pos);

    lv_area_t txt_coords;
    lv_obj_get_content_coords(obj, &txt_coords);
    const char * txt         = lv_label_get_text(obj);
    lv_label_t * label     = (lv_label_t *)obj;
    uint32_t line_start      = 0;
    uint32_t new_line_start  = 0;
    lv_coord_t max_w         = lv_area_get_width(&txt_coords);
    const lv_font_t * font   = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
    lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
    lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_MAIN);
    lv_coord_t letter_height    = lv_font_get_line_height(font);
    lv_text_align_t align = lv_obj_calculate_style_text_align(obj, LV_PART_MAIN, label->text);

    lv_coord_t y             = 0;
    lv_text_flag_t flag       = LV_TEXT_FLAG_NONE;

    if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
    if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;
    if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) flag |= LV_TEXT_FLAG_FIT;

    /*Search the line of the index letter*/;
    while(txt[line_start] != '\0') {
        new_line_start += _lv_txt_get_next_line(&txt[line_start], font, letter_space, max_w, NULL, flag);

        if(pos->y <= y + letter_height) break; /*The line is found (stored in 'line_start')*/
        y += letter_height + line_space;

        line_start = new_line_start;
    }

    /*Calculate the x coordinate*/
    lv_coord_t x      = 0;
    lv_coord_t last_x = 0;
    if(align == LV_TEXT_ALIGN_CENTER) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(&txt[line_start], new_line_start - line_start, font, letter_space, flag);
        x += lv_area_get_width(&txt_coords) / 2 - line_w / 2;
    }
    else if(align == LV_TEXT_ALIGN_RIGHT) {
        lv_coord_t line_w;
        line_w = lv_txt_get_width(&txt[line_start], new_line_start - line_start, font, letter_space, flag);
        x += lv_area_get_width(&txt_coords) - line_w;
    }

    lv_text_cmd_state_t cmd_state = LV_TEXT_CMD_STATE_WAIT;

    uint32_t i           = line_start;
    uint32_t i_current   = i;
    uint32_t letter      = '\0';
    uint32_t letter_next = '\0';

    if(new_line_start > 0) {
        while(i <= new_line_start - 1) {
            /*Get the current letter and the next letter for kerning*/
            /*Be careful 'i' already points to the next character*/
            _lv_txt_encoded_letter_next_2(txt, &letter, &letter_next, &i);

            /*Handle the recolor command*/
            if((flag & LV_TEXT_FLAG_RECOLOR) != 0) {
                if(_lv_txt_is_cmd(&cmd_state, txt[i]) != false) {
                    continue; /*Skip the letter if it is part of a command*/
                }
            }
            last_x = x;
            x += lv_font_get_glyph_width(font, letter, letter_next);
            if(pos->x < x) {
                i = i_current;
                break;
            }
            x += letter_space;
            i_current = i;
        }
    }

    int32_t max_diff = lv_font_get_glyph_width(font, letter, letter_next) + letter_space + 1;
    return (pos->x >= (last_x - letter_space) && pos->x <= (last_x + max_diff));
}

uint32_t lv_label_get_text_selection_start(const lv_obj_t * obj)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

#if LV_LABEL_TEXT_SELECTION
    lv_label_t * label = (lv_label_t *)obj;
    return label->sel_start;

#else
    LV_UNUSED(obj); /*Unused*/
    return LV_LABEL_TEXT_SELECTION_OFF;
#endif
}

uint32_t lv_label_get_text_selection_end(const lv_obj_t * obj)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);

#if LV_LABEL_TEXT_SELECTION
    lv_label_t * label = (lv_label_t *)obj;
    return label->sel_end;
#else
    LV_UNUSED(obj); /*Unused*/
    return LV_LABEL_TEXT_SELECTION_OFF;
#endif
}

/*=====================
 * Other functions
 *====================*/

void lv_label_ins_text(lv_obj_t * obj, uint32_t pos, const char * txt)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    LV_ASSERT_NULL(txt);

    lv_label_t * label = (lv_label_t *)obj;

    /*Can not append to static text*/
    if(label->static_txt != 0) return;

    lv_obj_invalidate(obj);

    /*Allocate space for the new text*/
    size_t old_len = strlen(label->text);
    size_t ins_len = strlen(txt);
    size_t new_len = ins_len + old_len;
    label->text        = lv_mem_realloc(label->text, new_len + 1);
    LV_ASSERT_MALLOC(label->text);
    if(label->text == NULL) return;

    if(pos == LV_LABEL_POS_LAST) {
        pos = _lv_txt_get_encoded_length(label->text);
    }

    _lv_txt_ins(label->text, pos, txt);
    lv_label_set_text(obj, NULL);
}

void lv_label_cut_text(lv_obj_t * obj, uint32_t pos, uint32_t cnt)
{
    LV_ASSERT_OBJ(obj, MY_CLASS);
    lv_label_t * label = (lv_label_t *)obj;

    /*Can not append to static text*/
    if(label->static_txt != 0) return;

    lv_obj_invalidate(obj);

    char * label_txt = lv_label_get_text(obj);
    /*Delete the characters*/
    _lv_txt_cut(label_txt, pos, cnt);

    /*Refresh the label*/
    lv_label_refr_text(obj);
}

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

static void lv_label_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
    LV_UNUSED(class_p);
    LV_TRACE_OBJ_CREATE("begin");

    lv_label_t * label = (lv_label_t *)obj;

    label->text       = NULL;
    label->static_txt = 0;
    label->recolor    = 0;
    label->dot_end    = LV_LABEL_DOT_END_INV;
    label->long_mode  = LV_LABEL_LONG_WRAP;
    label->offset.x = 0;
    label->offset.y = 0;

#if LV_LABEL_LONG_TXT_HINT
    label->hint.line_start = -1;
    label->hint.coord_y    = 0;
    label->hint.y          = 0;
#endif

#if LV_LABEL_TEXT_SELECTION
    label->sel_start = LV_DRAW_LABEL_NO_TXT_SEL;
    label->sel_end   = LV_DRAW_LABEL_NO_TXT_SEL;
#endif
    label->dot.tmp_ptr   = NULL;
    label->dot_tmp_alloc = 0;

    lv_obj_clear_flag(obj, LV_OBJ_FLAG_CLICKABLE);
    lv_label_set_long_mode(obj, LV_LABEL_LONG_WRAP);
    lv_label_set_text(obj, "Text");


    LV_TRACE_OBJ_CREATE("finished");
}

static void lv_label_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
    LV_UNUSED(class_p);
    lv_label_t * label = (lv_label_t *)obj;

    lv_label_dot_tmp_free(obj);
    if(!label->static_txt) lv_mem_free(label->text);
    label->text = NULL;
}

static void lv_label_event(const lv_obj_class_t * class_p, lv_event_t * e)
{
    LV_UNUSED(class_p);

    lv_res_t res;

    /*Call the ancestor's event handler*/
    res = lv_obj_event_base(MY_CLASS, e);
    if(res != LV_RES_OK) return;

    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * obj = lv_event_get_target(e);

    if(code == LV_EVENT_STYLE_CHANGED) {
        /*Revert dots for proper refresh*/
        lv_label_revert_dots(obj);
        lv_label_refr_text(obj);
    }
    else if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
        /* Italic or other non-typical letters can be drawn of out of the object.
         * It happens if box_w + ofs_x > adw_w in the glyph.
         * To avoid this add some extra draw area.
         * font_h / 4 is an empirical value. */
        const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
        lv_coord_t font_h = lv_font_get_line_height(font);
        lv_event_set_ext_draw_size(e, font_h / 4);
    }
    else if(code == LV_EVENT_SIZE_CHANGED) {
        lv_label_revert_dots(obj);
        lv_label_refr_text(obj);
    }
    else if(code == LV_EVENT_GET_SELF_SIZE) {
        lv_point_t size;
        lv_label_t * label = (lv_label_t *)obj;
        const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
        lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_MAIN);
        lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
        lv_text_flag_t flag = LV_TEXT_FLAG_NONE;
        if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
        if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;

        lv_coord_t w = lv_obj_get_content_width(obj);
        if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) w = LV_COORD_MAX;
        else w = lv_obj_get_content_width(obj);

        lv_txt_get_size(&size, label->text, font, letter_space, line_space, w, flag);

        lv_point_t * self_size = lv_event_get_param(e);
        self_size->x = LV_MAX(self_size->x, size.x);
        self_size->y = LV_MAX(self_size->y, size.y);
    }
    else if(code == LV_EVENT_DRAW_MAIN) {
        draw_main(e);
    }
}


static void draw_main(lv_event_t * e)
{
    lv_obj_t * obj = lv_event_get_target(e);
    lv_label_t * label = (lv_label_t *)obj;
    lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);

    lv_area_t txt_coords;
    lv_obj_get_content_coords(obj, &txt_coords);

    lv_text_flag_t flag = LV_TEXT_FLAG_NONE;
    if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
    if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;
    if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) flag |= LV_TEXT_FLAG_FIT;

    lv_draw_label_dsc_t label_draw_dsc;
    lv_draw_label_dsc_init(&label_draw_dsc);

    label_draw_dsc.ofs_x = label->offset.x;
    label_draw_dsc.ofs_y = label->offset.y;

    label_draw_dsc.flag = flag;
    lv_obj_init_draw_label_dsc(obj, LV_PART_MAIN, &label_draw_dsc);
    lv_bidi_calculate_align(&label_draw_dsc.align, &label_draw_dsc.bidi_dir, label->text);

    label_draw_dsc.sel_start = lv_label_get_text_selection_start(obj);
    label_draw_dsc.sel_end = lv_label_get_text_selection_end(obj);
    if(label_draw_dsc.sel_start != LV_DRAW_LABEL_NO_TXT_SEL && label_draw_dsc.sel_end != LV_DRAW_LABEL_NO_TXT_SEL) {
        label_draw_dsc.sel_color = lv_obj_get_style_text_color_filtered(obj, LV_PART_SELECTED);
        label_draw_dsc.sel_bg_color = lv_obj_get_style_bg_color(obj, LV_PART_SELECTED);
    }

    /* In SCROLL and SCROLL_CIRCULAR mode the CENTER and RIGHT are pointless, so remove them.
     * (In addition, they will create misalignment in this situation)*/
    if((label->long_mode == LV_LABEL_LONG_SCROLL || label->long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR) &&
       (label_draw_dsc.align == LV_TEXT_ALIGN_CENTER || label_draw_dsc.align == LV_TEXT_ALIGN_RIGHT)) {
        lv_point_t size;
        lv_txt_get_size(&size, label->text, label_draw_dsc.font, label_draw_dsc.letter_space, label_draw_dsc.line_space,
                        LV_COORD_MAX, flag);
        if(size.x > lv_area_get_width(&txt_coords)) {
            label_draw_dsc.align = LV_TEXT_ALIGN_LEFT;
        }
    }
#if LV_LABEL_LONG_TXT_HINT
    lv_draw_label_hint_t * hint = &label->hint;
    if(label->long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR || lv_area_get_height(&txt_coords) < LV_LABEL_HINT_HEIGHT_LIMIT)
        hint = NULL;

#else
    /*Just for compatibility*/
    lv_draw_label_hint_t * hint = NULL;
#endif

    lv_area_t txt_clip;
    bool is_common = _lv_area_intersect(&txt_clip, &txt_coords, draw_ctx->clip_area);
    if(!is_common) return;

    if(label->long_mode == LV_LABEL_LONG_WRAP) {
        lv_coord_t s = lv_obj_get_scroll_top(obj);
        lv_area_move(&txt_coords, 0, -s);
        txt_coords.y2 = obj->coords.y2;
    }
    if(label->long_mode == LV_LABEL_LONG_SCROLL || label->long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR) {
        const lv_area_t * clip_area_ori = draw_ctx->clip_area;
        draw_ctx->clip_area = &txt_clip;
        lv_draw_label(draw_ctx, &label_draw_dsc, &txt_coords, label->text, hint);
        draw_ctx->clip_area = clip_area_ori;
    }
    else {
        lv_draw_label(draw_ctx, &label_draw_dsc, &txt_coords, label->text, hint);
    }

    const lv_area_t * clip_area_ori = draw_ctx->clip_area;
    draw_ctx->clip_area = &txt_clip;

    if(label->long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR) {
        lv_point_t size;
        lv_txt_get_size(&size, label->text, label_draw_dsc.font, label_draw_dsc.letter_space, label_draw_dsc.line_space,
                        LV_COORD_MAX, flag);

        /*Draw the text again on label to the original to make a circular effect */
        if(size.x > lv_area_get_width(&txt_coords)) {
            label_draw_dsc.ofs_x = label->offset.x + size.x +
                                   lv_font_get_glyph_width(label_draw_dsc.font, ' ', ' ') * LV_LABEL_WAIT_CHAR_COUNT;
            label_draw_dsc.ofs_y = label->offset.y;

            lv_draw_label(draw_ctx, &label_draw_dsc, &txt_coords, label->text, hint);
        }

        /*Draw the text again below the original to make a circular effect */
        if(size.y > lv_area_get_height(&txt_coords)) {
            label_draw_dsc.ofs_x = label->offset.x;
            label_draw_dsc.ofs_y = label->offset.y + size.y + lv_font_get_line_height(label_draw_dsc.font);

            lv_draw_label(draw_ctx, &label_draw_dsc, &txt_coords, label->text, hint);
        }
    }

    draw_ctx->clip_area = clip_area_ori;
}

/**
 * Refresh the label with its text stored in its extended data
 * @param label pointer to a label object
 */
static void lv_label_refr_text(lv_obj_t * obj)
{
    lv_label_t * label = (lv_label_t *)obj;
    if(label->text == NULL) return;
#if LV_LABEL_LONG_TXT_HINT
    label->hint.line_start = -1; /*The hint is invalid if the text changes*/
#endif

    lv_area_t txt_coords;
    lv_obj_get_content_coords(obj, &txt_coords);
    lv_coord_t max_w         = lv_area_get_width(&txt_coords);
    const lv_font_t * font   = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
    lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
    lv_coord_t letter_space = lv_obj_get_style_text_letter_space(obj, LV_PART_MAIN);

    /*Calc. the height and longest line*/
    lv_point_t size;
    lv_text_flag_t flag = LV_TEXT_FLAG_NONE;
    if(label->recolor != 0) flag |= LV_TEXT_FLAG_RECOLOR;
    if(label->expand != 0) flag |= LV_TEXT_FLAG_EXPAND;
    if(lv_obj_get_style_width(obj, LV_PART_MAIN) == LV_SIZE_CONTENT && !obj->w_layout) flag |= LV_TEXT_FLAG_FIT;

    lv_txt_get_size(&size, label->text, font, letter_space, line_space, max_w, flag);

    lv_obj_refresh_self_size(obj);

    /*In scroll mode start an offset animation*/
    if(label->long_mode == LV_LABEL_LONG_SCROLL) {
        uint16_t anim_speed = lv_obj_get_style_anim_speed(obj, LV_PART_MAIN);
        if(anim_speed == 0) anim_speed = LV_LABEL_DEF_SCROLL_SPEED;
        lv_anim_t a;
        lv_anim_init(&a);
        lv_anim_set_var(&a, obj);
        lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
        lv_anim_set_playback_delay(&a, LV_LABEL_SCROLL_DELAY);
        lv_anim_set_repeat_delay(&a, a.playback_delay);

        bool hor_anim = false;
        if(size.x > lv_area_get_width(&txt_coords)) {
#if LV_USE_BIDI
            int32_t start, end;
            lv_base_dir_t base_dir = lv_obj_get_style_base_dir(obj, LV_PART_MAIN);

            if(base_dir == LV_BASE_DIR_AUTO)
                base_dir = _lv_bidi_detect_base_dir(label->text);

            if(base_dir == LV_BASE_DIR_RTL) {
                start = lv_area_get_width(&txt_coords) - size.x;
                end = 0;
            }
            else {
                start = 0;
                end = lv_area_get_width(&txt_coords) - size.x;
            }

            lv_anim_set_values(&a, start, end);
#else
            lv_anim_set_values(&a, 0, lv_area_get_width(&txt_coords) - size.x);
            lv_anim_set_exec_cb(&a, set_ofs_x_anim);
#endif
            lv_anim_set_exec_cb(&a, set_ofs_x_anim);

            lv_anim_t * anim_cur = lv_anim_get(obj, set_ofs_x_anim);
            int32_t act_time = 0;
            bool playback_now = false;
            if(anim_cur) {
                act_time = anim_cur->act_time;
                playback_now = anim_cur->playback_now;
            }
            if(act_time < a.time) {
                a.act_time = act_time;      /*To keep the old position*/
                a.early_apply = 0;
                if(playback_now) {
                    a.playback_now = 1;
                    /*Swap the start and end values*/
                    int32_t tmp;
                    tmp      = a.start_value;
                    a.start_value = a.end_value;
                    a.end_value   = tmp;
                }
            }

            lv_anim_set_time(&a, lv_anim_speed_to_time(anim_speed, a.start_value, a.end_value));
            lv_anim_set_playback_time(&a, a.time);
            lv_anim_start(&a);
            hor_anim = true;
        }
        else {
            /*Delete the offset animation if not required*/
            lv_anim_del(obj, set_ofs_x_anim);
            label->offset.x = 0;
        }

        if(size.y > lv_area_get_height(&txt_coords) && hor_anim == false) {
            lv_anim_set_values(&a, 0, lv_area_get_height(&txt_coords) - size.y - (lv_font_get_line_height(font)));
            lv_anim_set_exec_cb(&a, set_ofs_y_anim);

            lv_anim_t * anim_cur = lv_anim_get(obj, set_ofs_y_anim);
            int32_t act_time = 0;
            bool playback_now = false;
            if(anim_cur) {
                act_time = anim_cur->act_time;
                playback_now = anim_cur->playback_now;
            }
            if(act_time < a.time) {
                a.act_time = act_time;      /*To keep the old position*/
                a.early_apply = 0;
                if(playback_now) {
                    a.playback_now = 1;
                    /*Swap the start and end values*/
                    int32_t tmp;
                    tmp      = a.start_value;
                    a.start_value = a.end_value;
                    a.end_value   = tmp;
                }
            }

            lv_anim_set_time(&a, lv_anim_speed_to_time(anim_speed, a.start_value, a.end_value));
            lv_anim_set_playback_time(&a, a.time);
            lv_anim_start(&a);
        }
        else {
            /*Delete the offset animation if not required*/
            lv_anim_del(obj, set_ofs_y_anim);
            label->offset.y = 0;
        }
    }
    /*In roll inf. mode keep the size but start offset animations*/
    else if(label->long_mode == LV_LABEL_LONG_SCROLL_CIRCULAR) {
        uint16_t anim_speed = lv_obj_get_style_anim_speed(obj, LV_PART_MAIN);
        if(anim_speed == 0) anim_speed = LV_LABEL_DEF_SCROLL_SPEED;
        lv_anim_t a;
        lv_anim_init(&a);
        lv_anim_set_var(&a, obj);
        lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);

        bool hor_anim = false;
        if(size.x > lv_area_get_width(&txt_coords)) {
#if LV_USE_BIDI
            int32_t start, end;
            lv_base_dir_t base_dir = lv_obj_get_style_base_dir(obj, LV_PART_MAIN);

            if(base_dir == LV_BASE_DIR_AUTO)
                base_dir = _lv_bidi_detect_base_dir(label->text);

            if(base_dir == LV_BASE_DIR_RTL) {
                start = -size.x - lv_font_get_glyph_width(font, ' ', ' ') * LV_LABEL_WAIT_CHAR_COUNT;
                end = 0;
            }
            else {
                start = 0;
                end = -size.x - lv_font_get_glyph_width(font, ' ', ' ') * LV_LABEL_WAIT_CHAR_COUNT;
            }

            lv_anim_set_values(&a, start, end);
#else
            lv_anim_set_values(&a, 0, -size.x - lv_font_get_glyph_width(font, ' ', ' ') * LV_LABEL_WAIT_CHAR_COUNT);
#endif
            lv_anim_set_exec_cb(&a, set_ofs_x_anim);
            lv_anim_set_time(&a, lv_anim_speed_to_time(anim_speed, a.start_value, a.end_value));

            lv_anim_t * anim_cur = lv_anim_get(obj, set_ofs_x_anim);
            int32_t act_time = anim_cur ? anim_cur->act_time : 0;
            if(act_time < a.time) {
                a.act_time = act_time;      /*To keep the old position*/
                a.early_apply = 0;
            }

            lv_anim_start(&a);
            hor_anim = true;
        }
        else {
            /*Delete the offset animation if not required*/
            lv_anim_del(obj, set_ofs_x_anim);
            label->offset.x = 0;
        }

        if(size.y > lv_area_get_height(&txt_coords) && hor_anim == false) {
            lv_anim_set_values(&a, 0, -size.y - (lv_font_get_line_height(font)));
            lv_anim_set_exec_cb(&a, set_ofs_y_anim);
            lv_anim_set_time(&a, lv_anim_speed_to_time(anim_speed, a.start_value, a.end_value));

            lv_anim_t * anim_cur = lv_anim_get(obj, set_ofs_y_anim);
            int32_t act_time = anim_cur ? anim_cur->act_time : 0;
            if(act_time < a.time) {
                a.act_time = act_time;      /*To keep the old position*/
                a.early_apply = 0;
            }

            lv_anim_start(&a);
        }
        else {
            /*Delete the offset animation if not required*/
            lv_anim_del(obj, set_ofs_y_anim);
            label->offset.y = 0;
        }
    }
    else if(label->long_mode == LV_LABEL_LONG_DOT) {
        if(size.y <= lv_area_get_height(&txt_coords)) { /*No dots are required, the text is short enough*/
            label->dot_end = LV_LABEL_DOT_END_INV;
        }
        else if(size.y <= lv_font_get_line_height(font)) { /*No dots are required for one-line texts*/
            label->dot_end = LV_LABEL_DOT_END_INV;
        }
        else if(_lv_txt_get_encoded_length(label->text) <= LV_LABEL_DOT_NUM) {   /*Don't turn to dots all the characters*/
            label->dot_end = LV_LABEL_DOT_END_INV;
        }
        else {
            lv_point_t p;
            lv_coord_t y_overed;
            p.x = lv_area_get_width(&txt_coords) -
                  (lv_font_get_glyph_width(font, '.', '.') + letter_space) *
                  LV_LABEL_DOT_NUM; /*Shrink with dots*/
            p.y = lv_area_get_height(&txt_coords);
            y_overed = p.y %
                       (lv_font_get_line_height(font) + line_space); /*Round down to the last line*/
            if(y_overed >= lv_font_get_line_height(font)) {
                p.y -= y_overed;
                p.y += lv_font_get_line_height(font);
            }
            else {
                p.y -= y_overed;
                p.y -= line_space;
            }

            uint32_t letter_id = lv_label_get_letter_on(obj, &p);

            /*Be sure there is space for the dots*/
            size_t txt_len = strlen(label->text);
            uint32_t byte_id     = _lv_txt_encoded_get_byte_id(label->text, letter_id);
            while(byte_id + LV_LABEL_DOT_NUM > txt_len) {
                _lv_txt_encoded_prev(label->text, &byte_id);
                letter_id--;
            }

            /*Save letters under the dots and replace them with dots*/
            uint32_t byte_id_ori = byte_id;
            uint32_t i;
            uint8_t len = 0;
            for(i = 0; i <= LV_LABEL_DOT_NUM; i++) {
                len += _lv_txt_encoded_size(&label->text[byte_id]);
                _lv_txt_encoded_next(label->text, &byte_id);
                if(len > LV_LABEL_DOT_NUM || byte_id > txt_len) {
                    break;
                }
            }

            if(lv_label_set_dot_tmp(obj, &label->text[byte_id_ori], len)) {
                for(i = 0; i < LV_LABEL_DOT_NUM; i++) {
                    label->text[byte_id_ori + i] = '.';
                }
                label->text[byte_id_ori + LV_LABEL_DOT_NUM] = '\0';
                label->dot_end                              = letter_id + LV_LABEL_DOT_NUM;
            }
        }
    }
    else if(label->long_mode == LV_LABEL_LONG_CLIP) {
        /*Do nothing*/
    }

    lv_obj_invalidate(obj);
}


static void lv_label_revert_dots(lv_obj_t * obj)
{

    lv_label_t * label = (lv_label_t *)obj;

    if(label->long_mode != LV_LABEL_LONG_DOT) return;
    if(label->dot_end == LV_LABEL_DOT_END_INV) return;
    uint32_t letter_i = label->dot_end - LV_LABEL_DOT_NUM;
    uint32_t byte_i   = _lv_txt_encoded_get_byte_id(label->text, letter_i);

    /*Restore the characters*/
    uint8_t i      = 0;
    char * dot_tmp = lv_label_get_dot_tmp(obj);
    while(label->text[byte_i + i] != '\0') {
        label->text[byte_i + i] = dot_tmp[i];
        i++;
    }
    label->text[byte_i + i] = dot_tmp[i];
    lv_label_dot_tmp_free(obj);

    label->dot_end = LV_LABEL_DOT_END_INV;
}

/**
 * Store `len` characters from `data`. Allocates space if necessary.
 *
 * @param label pointer to label object
 * @param len Number of characters to store.
 * @return true on success.
 */
static bool lv_label_set_dot_tmp(lv_obj_t * obj, char * data, uint32_t len)
{

    lv_label_t * label = (lv_label_t *)obj;
    lv_label_dot_tmp_free(obj); /*Deallocate any existing space*/
    if(len > sizeof(char *)) {
        /*Memory needs to be allocated. Allocates an additional byte
         *for a NULL-terminator so it can be copied.*/
        label->dot.tmp_ptr = lv_mem_alloc(len + 1);
        if(label->dot.tmp_ptr == NULL) {
            LV_LOG_ERROR("Failed to allocate memory for dot_tmp_ptr");
            return false;
        }
        lv_memcpy(label->dot.tmp_ptr, data, len);
        label->dot.tmp_ptr[len] = '\0';
        label->dot_tmp_alloc    = true;
    }
    else {
        /*Characters can be directly stored in object*/
        label->dot_tmp_alloc = false;
        lv_memcpy(label->dot.tmp, data, len);
    }
    return true;
}

/**
 * Get the stored dot_tmp characters
 * @param label pointer to label object
 * @return char pointer to a stored characters. Is *not* necessarily NULL-terminated.
 */
static char * lv_label_get_dot_tmp(lv_obj_t * obj)
{
    lv_label_t * label = (lv_label_t *)obj;
    if(label->dot_tmp_alloc) {
        return label->dot.tmp_ptr;
    }
    else {
        return label->dot.tmp;
    }
}

/**
 * Free the dot_tmp_ptr field if it was previously allocated.
 * Always clears the field
 * @param label pointer to label object.
 */
static void lv_label_dot_tmp_free(lv_obj_t * obj)
{
    lv_label_t * label = (lv_label_t *)obj;
    if(label->dot_tmp_alloc && label->dot.tmp_ptr) {
        lv_mem_free(label->dot.tmp_ptr);
    }
    label->dot_tmp_alloc = false;
    label->dot.tmp_ptr   = NULL;
}


static void set_ofs_x_anim(void * obj, int32_t v)
{
    lv_label_t * label = (lv_label_t *)obj;
    label->offset.x    = v;
    lv_obj_invalidate(obj);
}

static void set_ofs_y_anim(void * obj, int32_t v)
{
    lv_label_t * label = (lv_label_t *)obj;
    label->offset.y    = v;
    lv_obj_invalidate(obj);
}


#endif