/**
  * @file lv_qrcode.c
  *
  */
 
 /*********************
  *      INCLUDES
  *********************/
 #include "lv_qrcode.h"
 #if LV_USE_QRCODE
 
 #include "qrcodegen.h"
 
 /*********************
  *      DEFINES
  *********************/
 #define MY_CLASS &lv_qrcode_class
 
 /**********************
  *      TYPEDEFS
  **********************/
 
 /**********************
  *  STATIC PROTOTYPES
  **********************/
 static void lv_qrcode_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_qrcode_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 
 /**********************
  *  STATIC VARIABLES
  **********************/
 
 const lv_obj_class_t lv_qrcode_class = {
     .constructor_cb = lv_qrcode_constructor,
     .destructor_cb = lv_qrcode_destructor,
     .base_class = &lv_canvas_class
 };
 
 static lv_coord_t size_param;
 static lv_color_t dark_color_param;
 static lv_color_t light_color_param;
 
 /**********************
  *      MACROS
  **********************/
 
 /**********************
  *   GLOBAL FUNCTIONS
  **********************/
 
 /**
  * Create an empty QR code (an `lv_canvas`) object.
  * @param parent point to an object where to create the QR code
  * @param size width and height of the QR code
  * @param dark_color dark color of the QR code
  * @param light_color light color of the QR code
  * @return pointer to the created QR code object
  */
 lv_obj_t * lv_qrcode_create(lv_obj_t * parent, lv_coord_t size, lv_color_t dark_color, lv_color_t light_color)
 {
     LV_LOG_INFO("begin");
     size_param = size;
     light_color_param = light_color;
     dark_color_param = dark_color;
 
     lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
     lv_obj_class_init_obj(obj);
     return obj;
 
 }
 
 /**
  * Set the data of a QR code object
  * @param qrcode pointer to aQ code object
  * @param data data to display
  * @param data_len length of data in bytes
  * @return LV_RES_OK: if no error; LV_RES_INV: on error
  */
 lv_res_t lv_qrcode_update(lv_obj_t * qrcode, const void * data, uint32_t data_len)
 {
     lv_color_t c;
     c.full = 1;
     lv_canvas_fill_bg(qrcode, c, LV_OPA_COVER);
 
     if(data_len > qrcodegen_BUFFER_LEN_MAX) return LV_RES_INV;
 
     lv_img_dsc_t * imgdsc = lv_canvas_get_img(qrcode);
 
     int32_t qr_version = qrcodegen_getMinFitVersion(qrcodegen_Ecc_MEDIUM, data_len);
     if(qr_version <= 0) return LV_RES_INV;
     int32_t qr_size = qrcodegen_version2size(qr_version);
     if(qr_size <= 0) return LV_RES_INV;
     int32_t scale = imgdsc->header.w / qr_size;
     if(scale <= 0) return LV_RES_INV;
     int32_t remain = imgdsc->header.w % qr_size;
 
     /* The qr version is incremented by four point */
     uint32_t version_extend = remain / (scale << 2);
     if(version_extend && qr_version < qrcodegen_VERSION_MAX) {
         qr_version = qr_version + version_extend > qrcodegen_VERSION_MAX ?
                      qrcodegen_VERSION_MAX : qr_version + version_extend;
     }
 
     uint8_t * qr0 = lv_mem_alloc(qrcodegen_BUFFER_LEN_FOR_VERSION(qr_version));
     LV_ASSERT_MALLOC(qr0);
     uint8_t * data_tmp = lv_mem_alloc(qrcodegen_BUFFER_LEN_FOR_VERSION(qr_version));
     LV_ASSERT_MALLOC(data_tmp);
     lv_memcpy(data_tmp, data, data_len);
 
     bool ok = qrcodegen_encodeBinary(data_tmp, data_len,
                                      qr0, qrcodegen_Ecc_MEDIUM,
                                      qr_version, qr_version,
                                      qrcodegen_Mask_AUTO, true);
 
     if(!ok) {
         lv_mem_free(qr0);
         lv_mem_free(data_tmp);
         return LV_RES_INV;
     }
 
     lv_coord_t obj_w = imgdsc->header.w;
     qr_size = qrcodegen_getSize(qr0);
     scale = obj_w / qr_size;
     int scaled = qr_size * scale;
     int margin = (obj_w - scaled) / 2;
     uint8_t * buf_u8 = (uint8_t *)imgdsc->data + 8;    /*+8 skip the palette*/
 
     /* Copy the qr code canvas:
      * A simple `lv_canvas_set_px` would work but it's slow for so many pixels.
      * So buffer 1 byte (8 px) from the qr code and set it in the canvas image */
     uint32_t row_byte_cnt = (imgdsc->header.w + 7) >> 3;
     int y;
     for(y = margin; y < scaled + margin; y += scale) {
         uint8_t b = 0;
         uint8_t p = 0;
         bool aligned = false;
         int x;
         for(x = margin; x < scaled + margin; x++) {
             bool a = qrcodegen_getModule(qr0, (x - margin) / scale, (y - margin) / scale);
 
             if(aligned == false && (x & 0x7) == 0) aligned = true;
 
             if(aligned == false) {
                 c.full = a ? 0 : 1;
                 lv_canvas_set_px_color(qrcode, x, y, c);
             }
             else {
                 if(!a) b |= (1 << (7 - p));
                 p++;
                 if(p == 8) {
                     uint32_t px = row_byte_cnt * y + (x >> 3);
                     buf_u8[px] = b;
                     b = 0;
                     p = 0;
                 }
             }
         }
 
         /*Process the last byte of the row*/
         if(p) {
             /*Make the rest of the bits white*/
             b |= (1 << (8 - p)) - 1;
 
             uint32_t px = row_byte_cnt * y + (x >> 3);
             buf_u8[px] = b;
         }
 
         /*The Qr is probably scaled so simply to the repeated rows*/
         int s;
         const uint8_t * row_ori = buf_u8 + row_byte_cnt * y;
         for(s = 1; s < scale; s++) {
             lv_memcpy((uint8_t *)buf_u8 + row_byte_cnt * (y + s), row_ori, row_byte_cnt);
         }
     }
 
     lv_mem_free(qr0);
     lv_mem_free(data_tmp);
     return LV_RES_OK;
 }
 
 
 void lv_qrcode_delete(lv_obj_t * qrcode)
 {
     lv_obj_del(qrcode);
 }
 
 /**********************
  *   STATIC FUNCTIONS
  **********************/
 
 static void lv_qrcode_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
     LV_UNUSED(class_p);
 
     uint32_t buf_size = LV_CANVAS_BUF_SIZE_INDEXED_1BIT(size_param, size_param);
     uint8_t * buf = lv_mem_alloc(buf_size);
     LV_ASSERT_MALLOC(buf);
     if(buf == NULL) return;
 
     lv_canvas_set_buffer(obj, buf, size_param, size_param, LV_IMG_CF_INDEXED_1BIT);
     lv_canvas_set_palette(obj, 0, dark_color_param);
     lv_canvas_set_palette(obj, 1, light_color_param);
 }
 
 static void lv_qrcode_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
     LV_UNUSED(class_p);
 
     lv_img_dsc_t * img = lv_canvas_get_img(obj);
     lv_img_cache_invalidate_src(img);
     lv_mem_free((void *)img->data);
     img->data = NULL;
 }
 
 #endif /*LV_USE_QRCODE*/

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