#include "mystdlib.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>

#include "map_plz.h"

static entry_t *g_book, *g_book_by_name;
static size_t g_book_size, g_zipmap_size;
static const char * g_zipmap[32000];
static FILE *g_mapfile_out;

int main(int argc, char **args) {
  MAP tbuch, zipmap, brutemap;
  FILE *bfile, *streetfile_out;
  char *ptr, *input = malloc(65335);
  char *ort = malloc(65335), vorwahl_block[16];
  unsigned int i, brutes_count = 0, report = 0;
  brute_t *brutes = malloc(200000*sizeof(brute_t));

  /* prepare io */
  if (argc != 4) exit(1);
  tbuch = map_file(args[1], 1);
  zipmap = map_file(args[2], 1);
  brutemap = map_file(args[3], 1);

  /* read all files */
  g_zipmap[0] = (char*)zipmap->addr;
  for (i=0; i<zipmap->size; ++i)
    if (!zipmap->addr[i])
        g_zipmap[++g_zipmap_size] = (char*)(zipmap->addr + i + 1);
  qsort(g_zipmap, g_zipmap_size, sizeof(char*), cc);

  ptr = (char*)brutemap->addr;

  /* Split brute records */
  while (ptr < (char*)brutemap->addr + brutemap->size) {
    brutes[brutes_count].count        = atol(ptr); ptr += strlen(ptr) + 1;
    brutes[brutes_count].similarity   = atol(ptr); ptr += strlen(ptr) + 1;

    brutes[brutes_count].vorwahl      = ptr; ptr += strlen(ptr) + 1;
    brutes[brutes_count].ort          = ptr; ptr += strlen(ptr) + 1;
    brutes[brutes_count].strasse_1992 = ptr; ptr += strlen(ptr) + 1;
    brutes[brutes_count].strasse_1995 = ptr; ptr += strlen(ptr) + 1;

    if (brutes[brutes_count].count >= 20 || brutes[brutes_count].similarity >= 70)
        brutes_count++;
  }
  qsort(brutes, brutes_count, sizeof(brute_t), sort_brutes);

  /* count phonebook lines */
  for (i=0; i<tbuch->size; ++i)
    if (!tbuch->addr[i])
      ++g_book_size;

  /* We expect 8 columns per line */
  g_book_size /= 8;

  g_book = (entry_t*)malloc(g_book_size * sizeof(entry_t));
  g_book_by_name = (entry_t*)malloc(g_book_size * sizeof(entry_t));

  /* Split pointers into input files into our arrays */
  for (i=0, ptr=(char*)tbuch->addr; i<g_book_size; ++i) {
    g_book[i].vorwahl = ptr; ptr += strlen(ptr) + 1;
    g_book[i].ort     = ptr; ptr += strlen(ptr) + 1;
    g_book[i].strasse = ptr; ptr += strlen(ptr) + 1;
    g_book[i].hnr     = ptr; ptr += strlen(ptr) + 1;
    g_book[i].name    = ptr; ptr += strlen(ptr) + 1;
    g_book[i].vorname = ptr; ptr += strlen(ptr) + 1;
    g_book[i].nummer  = ptr; ptr += strlen(ptr) + 1;
    g_book[i].plz     = ptr; ptr += strlen(ptr) + 1;
  }
  /* Copy input array so that it can be sorted by different criteria */
  memcpy(g_book_by_name, g_book, g_book_size * sizeof(entry_t));

  fprintf(stderr, "STEP 1: import done\n");

  /* Sort the whole thing */
  qsort(g_book,         g_book_size, sizeof(entry_t), sort_by_voshnvn);
  qsort(g_book_by_name, g_book_size, sizeof(entry_t), sort_by_vonvh);

  fprintf(stderr, "STEP 2: sort done\n");

  g_mapfile_out = fopen("zip_mapfile.txt", "w");
  streetfile_out = fopen("07_Strasse_fixed", "w");
  bfile = fopen("brutemap.txt", "w");

  while (1) {
    char flag, *t, *l = fgets(input, 65536, stdin);
    const char *orig_strasse;
    entry_t local;
    brute_t *found_brute;
    int once = 0, fixed = 0;

    if (!l) break;
    if ((report++ % 300000) == 0) fprintf(stderr, "% 10d lines done\n", report);

    /* Scan and skip flags */
    flag = strtoul(l, &l, 16); ++l;

    /* Copy vorwahl, if in field */
    local.vorwahl = advance_and_replace(&l, 9, 0);

    /* Copy over vorwahl for whole exported block, if we're not in cont */
    t = advance_and_replace(&l, 9, 0);
    if (flag < 2) strcpy(vorwahl_block, t);

    /* Only copy over ort from continuations, if present */
    if (flag < 2 || (*l != 9) ) local.ort = l; else local.ort = ort;
    advance_and_replace(&l, 9, 0);

    /* Take copy of ort for continuations, if on start of multi line record */
    if (flag == 1) strcpy(ort, local.ort);

    /* Copy rest of the fields verbatim */
    local.strasse = advance_and_replace(&l, 9, 0);
    local.hnr     = advance_and_replace(&l, 9, 0);
    local.name    = advance_and_replace(&l, 9, 0);
    local.vorname = advance_and_replace(&l, 9, 0);
    local.nummer  = advance_and_replace(&l, 9, 0);
    local.plz     = advance_and_replace(&l, 9, ':');
    advance_and_replace(&l, 10, 0);

    orig_strasse = local.strasse;
rescan:

    if (search_and_verify(&local, sort_by_voshnvn, 1) ||
        search_and_verify(&local, sort_by_voshnv, 1)  ||
        search_and_verify(&local, sort_by_vosh, 0) ||
        search_and_verify(&local, sort_by_vos, 0)) {
      fputs(fixed ? local.strasse : orig_strasse, streetfile_out);
      fputc(10, streetfile_out);
      continue;
    }

    /* If we can't find the street, it might be due to an incorrect vorwahl, try to fix it up */
    if (strcmp(local.vorwahl, vorwahl_block)) {
        local.vorwahl = vorwahl_block;
        goto rescan;
    }

    /* If we do have vorwahl + ort + strasse + hnr, but no match, street might have changed name */
    if (*local.vorwahl && *local.ort && *local.strasse && *local.hnr && *local.name) {
        entry_t *found = bsearch_first(&local, g_book_by_name, g_book_size, sizeof(entry_t), sort_by_vonvh);
        if (found)
            fprintf(bfile, "%s\t%s\t%s\t%s\t%s\n", local.vorwahl, local.ort, local.strasse, found->strasse, local.hnr);
    }

    /* See if we can find and correct the street name */
    if (!once++) {
      found_brute = bsearch(&local, brutes, brutes_count, sizeof(brute_t), search_brute);
      if (found_brute && ( (found_brute->similarity >= 70) || (found_brute->count >= 20)) ) {
        fixed = found_brute->similarity >= 80;
        local.strasse = found_brute->strasse_1995;
        goto rescan;
      }
    }

    /* If nothing works, see if the whole village has only one zip, else just print an empty line */
    if (!search_and_verify(&local, sort_by_vo, 2))
      putchar(10);
    fputs(orig_strasse, streetfile_out);
    fputc(10, streetfile_out);
  }
}

static char * advance_and_replace(char **p, char find, char replace) {
  char *copy = *p;
  *p = strchr(*p, find);
  **p = replace;
  ++*p;
  return copy;
}

static void *bsearch_first( const void * const key, const void * base, const size_t nel, const size_t width, int (*compar) (const void *, const void *)) {
  size_t interval = nel;
  const void * first = base;
  int cmp;

  while (interval) {
    uint8_t *lookat = ((uint8_t*)base) + width * ( interval / 2 );
    cmp = compar(key, (void*)lookat);
    if(cmp == 0 && ((base == first) || compar(key, (void*)(lookat-width))))
        return lookat;
    if(cmp > 0) {
      base = lookat + width;
      interval--;
    }
    interval /= 2;
  }

  return 0;
}

/* For if we have vorwahl and ort and strasse */
static int sort_by_voshnvn(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  if ((res = strcmp(ea->strasse, eb->strasse))) return res;
  if ((res = strcmp(ea->hnr,     eb->hnr    ))) return res;
  if ((res = strcmp(ea->name,    eb->name   ))) return res;
  if ((res = strcmp(ea->vorname, eb->vorname))) return res;
  if ((res = strcmp(ea->nummer,  eb->nummer ))) return res;
  return 0;
}

/* more relaxed, if rufnummer missmatches */
static int sort_by_voshnv(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  if ((res = strcmp(ea->strasse, eb->strasse))) return res;
  if ((res = strcmp(ea->hnr,     eb->hnr    ))) return res;
  if ((res = strcmp(ea->name,    eb->name   ))) return res;
  if ((res = strcmp(ea->vorname, eb->vorname))) return res;
  return 0;
}

/* more relaxed, if rufnummer missmatches */
static int sort_by_vosh(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  if ((res = strcmp(ea->strasse, eb->strasse))) return res;
  if ((res = strcmp(ea->hnr,     eb->hnr    ))) return res;
  return 0;
}

/* more relaxed, if rufnummer missmatches */
static int sort_by_vos(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  if ((res = strcmp(ea->strasse, eb->strasse))) return res;
  return 0;
}

/* last resort, check if the whole vorwahl+ort set matches a single zip */
static int sort_by_vo(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  return 0;
}

/* For brute forcing name if we can't find strasse */
static int sort_by_vonvh(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t *)a;
  entry_t *eb = (entry_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl))) return res;
  if ((res = strcmp(ea->ort,     eb->ort    ))) return res;
  if ((res = strcmp(ea->name,    eb->name   ))) return res;
  if ((res = strcmp(ea->vorname, eb->vorname))) return res;
  if ((res = strcmp(ea->hnr,     eb->hnr    ))) return res;
  return 0;
}

static int sort_brutes(const void *a, const void *b) {
  int res;
  brute_t *ea = (brute_t *)a;
  brute_t *eb = (brute_t *)b;

  if ((res = strcmp(ea->vorwahl,      eb->vorwahl     ))) return res;
  if ((res = strcmp(ea->ort,          eb->ort         ))) return res;
  if ((res = strcmp(ea->strasse_1992, eb->strasse_1992))) return res;
  return 0;
}

static int search_brute(const void *a, const void *b) {
  int res;
  entry_t *ea = (entry_t*)a;
  brute_t *eb = (brute_t *)b;

  if ((res = strcmp(ea->vorwahl, eb->vorwahl     ))) return res;
  if ((res = strcmp(ea->ort,     eb->ort         ))) return res;
  if ((res = strcmp(ea->strasse, eb->strasse_1992))) return res;
  return 0;
}

/* If zip codes end in dots, always chose the one with more info */
static int test_dot(entry_t * iter, entry_t * found) {
    char * dot_iter = strchr(iter->plz, '.');
    char * dot_found = strchr(found->plz, '.');
    int di = 64, df = 64; // magic value large enough so that the MIN() always choses the other one

    if (!dot_iter && !dot_found) return 0;

    if (dot_iter)  di = dot_iter - iter->plz;
    if (dot_found) df = dot_found - found->plz;

    if (memcmp(iter->plz, found->plz, ((di < df) ? di : df))) return 0;

    if (dot_iter && !dot_found) iter->plz = found->plz;
    if (!dot_iter && dot_found) found->plz = iter->plz;
    if (dot_iter && dot_found && di > df) found->plz = iter->plz;
    if (dot_iter && dot_found && di < df) iter->plz = found->plz;

    return 1;
}

static entry_t * verify_unique_zip(entry_t *found, entry_t *candidate, int (*compar) (const void *, const void *)) {
    entry_t *test_iter = found + 1;
    entry_t *end = g_book + g_book_size;

    while (test_iter < end && !compar((void*)candidate, (void*)test_iter)) {
        if (strcmp(test_iter->plz, found->plz)) {
            if (test_dot(test_iter, found))
                continue;
            return 0;
        }
        ++test_iter;
    }

    return found;
}

static entry_t * verify_zip(entry_t *found, entry_t *candidate, int (*compar) (const void *, const void *)) {
    entry_t *test_iter = found + 1;
    entry_t *end = g_book + g_book_size;
    char pair[32];

    if (!g_zipmap_size)
        return verify_unique_zip(found, candidate, compar);

    /* Do we know about the oldzip-newzip mapping? */
    strcpy(pair, candidate->plz); strcat(pair,"\t"); strcat(pair, found->plz);
    if (bsearch(pair, g_zipmap, g_zipmap_size, sizeof(char*), cc2))
        return found;

    while ((test_iter < end) && !compar((void*)candidate, (void*)test_iter)) {
        if (strcmp(test_iter->plz, found->plz)) {
            if (test_dot(test_iter, found))
                continue;
            strcpy(pair, candidate->plz); strcat(pair,"\t"); strcat(pair, test_iter->plz);
            if (bsearch(pair, g_zipmap, g_zipmap_size, sizeof(char*), cc2)) {
                // printf ("FIXED %s -> %s: ", found->plz, test_iter->plz);
                return test_iter;
            }
        }
        ++test_iter;
    }

    return found;
}

static int search_and_verify(entry_t *candidate, int (*compar) (const void *, const void *), int flag) {
  entry_t *found = bsearch_first(candidate, g_book, g_book_size, sizeof(entry_t), compar);

  if (!found) return 0;

  if (flag == 2)
    found = verify_unique_zip(found, candidate, compar);
  else
    found = verify_zip(found, candidate, compar);

  if (!found)
    return 0;

  if (flag == 1)
    fprintf(g_mapfile_out, "%s\t%s\n", candidate->plz, found->plz);

  /* Output plz*/
  puts(found->plz);

  return 1;
}