#include "lvgl.h"
#include <stdio.h>
#include <string.h>

#define SCREEN_W     1024
#define SCREEN_H     600
#define TOTAL_ROWS   50
#define VISIBLE_ROWS 15
#define COL_CNT      6

/* Dynamic Row 7 Data */
typedef struct {
    int vol;
    int temp;
    int res;
} row_data_t;

static row_data_t row7_data = {1,1,601};

/* Row height */
static lv_coord_t ROW_H;

/* Column character width, used to fill the whole screen (monospaced font) */
static int col_chars[COL_CNT] = {6, 12, 12, 12, 10, 30};

/* ===== Generate row text with spacing for columns ===== */
static void get_row_text_str(int row, char * buf, int len)
{
    char temp[128];
    char name[16];

    if(row == 6) {
        snprintf(temp, sizeof(temp),
                 "%-*s %-*s %-*d %-*d %-*d %-*s",
                 col_chars[0], "7",
                 col_chars[1], "BT007",
                 col_chars[2], row7_data.vol,
                 col_chars[3], row7_data.temp,
                 col_chars[4], row7_data.res,
                 col_chars[5], "2025-12-17 17:05");
    } else {
        snprintf(name, sizeof(name), "BT%03d", row+1);
        snprintf(temp, sizeof(temp),
                 "%-*d %-*s %-*d %-*d %-*d %-*s",
                 col_chars[0], row+1,
                 col_chars[1], name,
                 col_chars[2], 12+row,
                 col_chars[3], 20+row,
                 col_chars[4], 601+row,
                 col_chars[5], "2025-12-17 17:05");
    }
    strncpy(buf, temp, len-1);
    buf[len-1] = 0;
}

/* ===== Array to store label objects ===== */
static lv_obj_t * label_rows[TOTAL_ROWS];

/* ===== Update Row 7 ===== */
static void update_row7_label(void)
{
    char buf[128];
    get_row_text_str(6, buf, sizeof(buf));
    lv_label_set_text(label_rows[6], buf);
}

/* ===== Timer callback for Row 7 dynamic update ===== */
static void row7_timer_cb(lv_timer_t * t)
{
    row7_data.vol++;
    row7_data.temp++;
    row7_data.res++;
    update_row7_label();
}

/* ===== Main demo function ===== */
void demo_label_table(void)
{
    lv_obj_t * scr = lv_scr_act();
    lv_obj_clean(scr);

    /* Calculate row height to show VISIBLE_ROWS rows */
    ROW_H = SCREEN_H / VISIBLE_ROWS;

    /* Create scrollable container */
    lv_obj_t * cont = lv_obj_create(scr);
    lv_obj_set_size(cont, SCREEN_W, SCREEN_H);
    lv_obj_set_scroll_dir(cont, LV_DIR_VER);
    lv_obj_set_scrollbar_mode(cont, LV_SCROLLBAR_MODE_AUTO);

    /* Create 50 label rows */
    for(int r=0; r<TOTAL_ROWS; r++){
        label_rows[r] = lv_label_create(cont);
        lv_obj_set_size(label_rows[r], SCREEN_W, ROW_H);
        lv_obj_set_pos(label_rows[r], 0, r*ROW_H);

        char buf[128];
        get_row_text_str(r, buf, sizeof(buf));
        lv_label_set_text(label_rows[r], buf);
        lv_obj_set_style_text_align(label_rows[r], LV_TEXT_ALIGN_LEFT, 0);
        lv_obj_set_style_text_font(label_rows[r], &lv_font_montserrat_14, 0);
    }

    /* Create timer for Row 7 dynamic update */
    lv_timer_create(row7_timer_cb, 500, NULL);

    /* Scroll to top initially */
    lv_obj_scroll_to_y(cont, 0, LV_ANIM_OFF);
}