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// Copyright 2015-2019 SWIM.AI 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.

package swim.uri;

import swim.collections.HashTrieMap;

abstract class UriPathMapper extends UriAuthorityMapper {
  abstract T get(UriPath path, UriQuery query, UriFragment fragment);

  @Override
  T get(UriAuthority authority, UriPath path, UriQuery query, UriFragment fragment) {
    return get(path, query, fragment);
  }

  abstract UriPathMapper merged(UriPathMapper that);

  @Override
  UriAuthorityMapper merged(UriAuthorityMapper that) {
    if (that instanceof UriPathMapper) {
      return merged((UriPathMapper) that);
    } else {
      return that;
    }
  }

  abstract UriPathMapper removed(UriPath path, UriQuery query, UriFragment fragment);

  @Override
  UriAuthorityMapper removed(UriAuthority authority, UriPath path, UriQuery query, UriFragment fragment) {
    return removed(path, query, fragment);
  }

  abstract UriPathMapper unmerged(UriPathMapper that);

  @Override
  UriAuthorityMapper unmerged(UriAuthorityMapper that) {
    if (that instanceof UriPathMapper) {
      return unmerged((UriPathMapper) that);
    } else {
      return this;
    }
  }

  @SuppressWarnings("unchecked")
  static  UriPathMapper compile(Uri pattern, UriPath path, UriQuery query, UriFragment fragment, T value) {
    if (!path.isEmpty()) {
      final String segment = path.head();
      if (!segment.isEmpty() && segment.charAt(0) == ':') {
        return new UriPathMapping(HashTrieMap.>empty(), compile(pattern, path.tail(), query, fragment, value), (UriQueryMapper) empty());
      } else {
        return new UriPathMapping(HashTrieMap.>empty().updated(segment, compile(pattern, path.tail(), query, fragment, value)), (UriPathMapper) empty(), (UriQueryMapper) empty());
      }
    } else {
      return new UriPathMapping(HashTrieMap.>empty(), (UriPathMapper) empty(), UriQueryMapper.compile(pattern, query, fragment, value));
    }
  }
}