#include <stdio.h>
#include "edid.h"

#define FAILURE(buf_str, line)                                    \
  fprintf(stderr, "X Failed on line %d: [%s]\n", line, buf_str);  \
  return EXIT_FAILURE;                                          

#define SUCCESS(buf_str, line)                                    \
  fprintf(stdout, "✓ Success on line %d: [%s]\n", line, buf_str); 
  
#define CHECK_TRUE(expr)        \
    if (!(expr)) {              \
      FAILURE(#expr, __LINE__); \
    } else {                    \
      SUCCESS(#expr, __LINE__); \
    }

static const uint8_t i2c_data_screen_0[EDID_LEN] = {
  0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x1e, 0x6d, 0xd5, 0x59, 0x04, 0x45, 0x09, 0x00,
  0x03, 0x17, 0x01, 0x03, 0x68, 0x35, 0x1e, 0x78, 0xea, 0x33, 0x31, 0xa4, 0x57, 0x51, 0xa0, 0x26,
  0x10, 0x50, 0x54, 0xa7, 0x6b, 0x80, 0xb3, 0x00, 0x81, 0x80, 0x95, 0x00, 0x71, 0x4f, 0xa9, 0xc0,
  0x81, 0x00, 0x81, 0xc0, 0x90, 0x40, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
  0x45, 0x00, 0x09, 0x25, 0x21, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x38, 0x4b, 0x1e,
  0x53, 0x0f, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x32,
  0x34, 0x45, 0x4e, 0x33, 0x33, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xff,
  0x00, 0x33, 0x30, 0x33, 0x4e, 0x44, 0x51, 0x41, 0x48, 0x56, 0x34, 0x39, 0x32, 0x0a, 0x00, 0xf1  
};    

/**
 * @brief Helper function to compare EDID data structure with golden design data structure extracted from real 
 *        VGA screen.
 */
static int compare_edid(const uint8_t* const edid, const uint8_t* const edid_golden) 
{
  for (int sanny=0; sanny<EDID_LEN; sanny++) {
    CHECK_TRUE(edid[sanny] == edid_golden[sanny]);
  }
  return 0;
}

/**
 * @brief Helper function to show buffer
 */
static void disp_buf(uint8_t *buf, int len)
{
  int i;
  for (i = 0; i < len; i++) {
    printf("%02x ", buf[i]);
    if ((i + 1) % 16 == 0) {
      printf("\n");
    }
  }
  printf("\n");
}

int main(void)
{
  edid_t edith;
  const char* const json_file = "edid0.json";
  
  /* 1) If check fails the structure has been build up in the wrong way on the target platform. 
   */
  CHECK_TRUE(sizeof(edid_t) == EDID_LEN);
  /* 2) If check fails the EDID data structure could not be generated. 
   */
  CHECK_TRUE(generate_edid(&edith, json_file) == 0);
  /* 3) 128 checks in one function to probe every single byte.  
   */
  int ret = 0;
  if (ret = compare_edid((uint8_t*)&edith, i2c_data_screen_0)) {
    printf("ret> %d\n", ret);
    return ret;
  }
  printf("\n");
  printf("Generated EDID data from %s:\n", json_file);
  disp_buf((uint8_t*)&edith, EDID_LEN);
  return 0;
}