/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#import "NSDictionary+GRPC.h"

#include <grpc/support/alloc.h>

@implementation NSDictionary (GRPC)
+ (instancetype)grpc_dictionaryFromMetadata:(grpc_metadata *)entries count:(size_t)count {
  NSMutableDictionary *metadata = [NSMutableDictionary dictionaryWithCapacity:count];
  for (grpc_metadata *entry = entries; entry < entries + count; entry++) {
    // TODO(jcanizales): Verify in a C library test that it's converting header names to lower case automatically.
    NSString *name = [NSString stringWithUTF8String:entry->key];
    if (!name) {
      continue;
    }
    if (!metadata[name]) {
      metadata[name] = [NSMutableArray array];
    }
    // TODO(jcanizales): Should we use a non-copy constructor?
    [metadata[name] addObject:[NSData dataWithBytes:entry->value
                                             length:entry->value_length]];
  }
  return metadata;
}

- (grpc_metadata *)grpc_metadataArray {
  grpc_metadata *metadata = gpr_malloc([self count] * sizeof(grpc_metadata));
  int i = 0;
  for (id key in self) {
    id value = self[key];
    grpc_metadata *current = &metadata[i];
    current->key = [key UTF8String];
    if ([value isKindOfClass:[NSData class]]) {
      current->value = [value bytes];
    } else if ([value isKindOfClass:[NSString class]]) {
      current->value = [value UTF8String];
    } else {
      [NSException raise:NSInvalidArgumentException
                  format:@"Metadata values must be NSString or NSData."];
    }
    i += 1;
  }
  return metadata;
}
@end
