#include <stdlib.h>
#include <stdio.h>
#include "packet.h"

int main(int argc, char** argv) {
  if (argc != 3) {
    fprintf(stderr, "Usage %s ./cap.0 ./cap.1\n", argv[0]);
    exit(EXIT_FAILURE);
  }
  uint8_t verbose = 0;

  FILE *fd[2]; size_t sz[2];
  for (int i = 0; i < 2; i++) {
    if ((fd[i] = fopen(argv[i+1], "r")) == NULL) {
      perror("Unable to open file");
      exit(EXIT_FAILURE);
    }

    fseek(fd[i], 0, SEEK_END);
    sz[i] = ftell(fd[i]);
    fseek(fd[i], 0, SEEK_SET);
  }

  if (sz[0] != sz[1]) {
    printf("[!!] %s has %ld entries, %s has %ld entries\n",
           argv[1],
           sz[0]/sizeof(struct buffer_packet),
           argv[2],
           sz[1]/sizeof(struct buffer_packet));
  } else if (verbose) {
    printf("[OK] %s and %s have %ld entries\n",
           argv[1],
           argv[2],
           sz[0]/sizeof(struct buffer_packet));
  }

  size_t to_read = sz[0] < sz[1] ? sz[0] : sz[1];
  size_t to_read_obj = to_read / sizeof(struct buffer_packet);
  uint16_t expected_id = 0;
  struct buffer_packet bpread[2];
  for (size_t c = 0; c < to_read_obj; c++) {
    for (int i = 0; i < 2; i++) fread(&bpread[i], sizeof(struct buffer_packet), 1, fd[i]);
    /*if (expected_id != bpread[0].ip.ap.fmt.content.clear.id || expected_id != bpread[1].ip.ap.fmt.content.clear.id) {
      printf("[!!] expected id is %d, %s has id %d, %s has id %d\n",
             expected_id,
             argv[1],
             bpread[0].ip.ap.fmt.content.clear.id,
             argv[2],
             bpread[1].ip.ap.fmt.content.clear.id);
    }*/

    size_t s1 = bpread[0].ip.ap.fmt.headers.size, s2 = bpread[1].ip.ap.fmt.headers.size;
    uint8_t is_same_size = s1 == s2;
    if (!is_same_size) {
      printf("[!!] %s packet has size %d, %s packet has size %d for expected id %d\n",
             argv[1],
             bpread[0].ip.ap.fmt.headers.size,
             argv[2],
             bpread[1].ip.ap.fmt.headers.size,
             expected_id);
    } else if (verbose) {
      printf("[OK] %s and %s packets for expected id %d have size %d\n",
             argv[1],
             argv[2],
             expected_id,
             bpread[0].ip.ap.fmt.headers.size);
    }


    size_t max_size = s1 > s2 ? s1 : s2;
    for (size_t idx = sizeof(bpread[0].ip.ap.fmt.headers) + sizeof(bpread[0].ip.ap.fmt.content.clear) - sizeof(char); idx < max_size; idx++) {
      char e1 = (&bpread[0].ip.ap.raw)[idx], e2 = (&bpread[1].ip.ap.raw)[idx];
      if (e1 != e2) {
        printf("[!!] for expected id %d, byte 0x%04x is different: 0x%02x vs 0x%02x\n", expected_id, (uint16_t)idx, (uint8_t)e1, (uint8_t)e2);
      }
    }

    expected_id++;
  }


  for (int i = 0; i < 2; i++) {
    fclose(fd[i]);
  }

  printf("parsed %d packets\n", expected_id);
  return 0;
}