/*
 * Copyright 2013 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <bson.h>
#include <bcon.h>

#define QUERY(...) ELE_QUERY, __VA_ARGS__, NULL
#define SORT(...) ELE_SORT, __VA_ARGS__, NULL
#define LIMIT(var) ELE_LIMIT, (var)
#define COL_VIEW_CREATE(...) col_view_create("", __VA_ARGS__, ELE_END)

typedef enum ele {
   ELE_SORT,
   ELE_LIMIT,
   ELE_QUERY,
   ELE_END,
} ele_t;

bson_t *
col_view_create(const char * stub, ...)
{
   bson_t * bson;
   va_list ap;
   ele_t type;
   int keep_going = 1;

   bcon_append_ctx_t ctx;
   bcon_append_ctx_init(&ctx);

   va_start(ap, stub);

   bson = bson_new();

   while (keep_going) {
      type = va_arg(ap, ele_t);

      switch (type) {
         case ELE_SORT:
            BCON_APPEND_CTX(bson, &ctx, "sort", "{");
            bcon_append_ctx_va(bson, &ctx, &ap);
            BCON_APPEND_CTX(bson, &ctx, "}");
            break;
         case ELE_LIMIT: {
            int i = va_arg(ap, int);
            BCON_APPEND_CTX(bson, &ctx, "limit", BCON_INT32(i));
            break;
         }
         case ELE_QUERY:
            BCON_APPEND_CTX(bson, &ctx, "query", "{");
            bcon_append_ctx_va(bson, &ctx, &ap);
            BCON_APPEND_CTX(bson, &ctx, "}");
            break;
         case ELE_END:
            keep_going = 0;
            break;
         default:
            assert(0);
            break;
      }
   }

   va_end(ap);

   return bson;
}

int
main (int   argc,
      char *argv[])
{
   bson_t * bson;
   char * json;

   bson = COL_VIEW_CREATE(
      SORT("a", BCON_INT32(1)),
      QUERY("hello", "world"),
      LIMIT(10)
   );

   json = bson_as_json(bson, NULL);
   printf("%s\n", json);
   bson_free(json);

   bson_destroy(bson);

   return 0;
}
