#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "object-name.h"

#include "remote.h"

#include "refspec.h"

#include "repository.h"

#include "checkout.h"

#include "config.h"

#include "strbuf.h"

struct tracking_name_data {

  /* const */ char *src_ref;

  char *dst_ref;

  struct object_id *dst_oid;

  int num_matches;

  const char *default_remote;

  char *default_dst_ref;

  struct object_id *default_dst_oid;

};

#define TRACKING_NAME_DATA_INIT { 0 }

static int check_tracking_name(struct remote *remote, void *cb_data)

{

  struct tracking_name_data *cb = cb_data;

  struct refspec_item query;

  memset(&query, 0, sizeof(struct refspec_item));

  query.src = cb->src_ref;

  if (remote_find_tracking(remote, &query) ||

      repo_get_oid(the_repository, query.dst, cb->dst_oid)) {

    free(query.dst);

    return 0;

  }

  cb->num_matches++;

  if (cb->default_remote && !strcmp(remote->name, cb->default_remote)) {

    struct object_id *dst = xmalloc(sizeof(*cb->default_dst_oid));

    cb->default_dst_ref = xstrdup(query.dst);

    oidcpy(dst, cb->dst_oid);

    cb->default_dst_oid = dst;

  }

  if (cb->dst_ref) {

    free(query.dst);

    return 0;

  }

  cb->dst_ref = query.dst;

  return 0;

}

char *unique_tracking_name(const char *name, struct object_id *oid,

         int *dwim_remotes_matched)

{

  struct tracking_name_data cb_data = TRACKING_NAME_DATA_INIT;

  const char *default_remote = NULL;

  if (!git_config_get_string_tmp("checkout.defaultremote", &default_remote))

    cb_data.default_remote = default_remote;

  cb_data.src_ref = xstrfmt("refs/heads/%s", name);

  cb_data.dst_oid = oid;

  for_each_remote(check_tracking_name, &cb_data);

  if (dwim_remotes_matched)

    *dwim_remotes_matched = cb_data.num_matches;

  free(cb_data.src_ref);

  if (cb_data.num_matches == 1) {

    free(cb_data.default_dst_ref);

    free(cb_data.default_dst_oid);

    return cb_data.dst_ref;

  }

  free(cb_data.dst_ref);

  if (cb_data.default_dst_ref) {

    oidcpy(oid, cb_data.default_dst_oid);

    free(cb_data.default_dst_oid);

    return cb_data.default_dst_ref;

  }

  return NULL;

}