//

// parse-repo.c

//

// Copyright (c) 2014 Stephen Mathieson

// MIT licensed

//

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include "strdup/strdup.h"

#include "substr/substr.h"

#include "parse-repo.h"

char *

parse_repo_owner(const char *slug, const char *fallback) {

  char *copy = NULL;

  char *owner = NULL;

  if (NULL == slug) return NULL;

  if (0 == strlen(slug)) return NULL;

  if (!(copy = strdup(slug))) return NULL;

  if ((owner = strchr(copy, '/'))) {

    int delta = owner - copy;

    if (!delta) {

      free(copy);

      return NULL;

    }

    char *tmp = substr(copy, 0, delta);

    free(copy);

    return tmp;

  }

  if (fallback && 0 < strlen(copy) && '@' != copy[0]) {

    owner = strdup(fallback);

  }

  free(copy);

  return owner;

}

char *

parse_repo_name(const char *slug) {

  char *owner = NULL;

  char *copy = NULL;

  char *name = NULL;

  char *version = NULL;

  if (NULL == slug) return NULL;

  if (0 == strlen(slug)) return NULL;

  if (!(copy = strdup(slug))) return NULL;

  if ((version = strchr(copy, '@'))) {

    int delta = version - copy;

    char *tmp = substr(copy, 0, delta);

    free(copy);

    if (!tmp) return NULL;

    copy = tmp;

  }

  if ((owner = strchr(copy, '/'))) {

    int delta = owner - copy;

    if (!delta) {

      free(copy);

      return NULL;

    }

    char *tmp = substr(copy, delta + 1, -1);

    free(copy);

    copy = tmp;

  }

  if (copy) name = strdup(copy);

  free(copy);

  return name;

}

char *

parse_repo_version(const char *slug, const char *fallback) {

  // malformed slugs

  if (NULL == slug) return NULL;

  if (0 == strlen(slug)) return NULL;

  char *name = parse_repo_name(slug);

  if (NULL == name) return NULL;

  free(name);

  char *version = strchr(slug, '@');

  if (version) {

    version++;

    // malformed

    if (0 == strlen(version)) return NULL;

    // * <-> master

    if ('*' == version[0]) return strdup("master");

    return strdup(version);

  }

  version = NULL;

  if (fallback) version = strdup(fallback);

  return version;

}