/*
 * Copyright 2025 Hirokazu Kobayashi
 *
 * 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 org.idp.server.platform.jose;

import com.nimbusds.jose.jwk.JWK;
import com.nimbusds.jose.jwk.JWKSet;
import java.text.ParseException;
import java.util.List;
import java.util.Map;

/** JwkParser */
public class JwkParser {

  public static JsonWebKey parse(String value) throws JsonWebKeyInvalidException {
    try {
      JWK jwk = JWK.parse(value);
      return new JsonWebKey(jwk);
    } catch (ParseException e) {
      throw new JsonWebKeyInvalidException(e.getMessage(), e);
    }
  }

  public static JsonWebKeys parseKeys(String value) throws JsonWebKeyInvalidException {
    if (value == null || value.trim().isEmpty()) {
      throw new JsonWebKeyInvalidException(
          "JWKS value is null or empty. Client must have a valid JWKS for signed request object verification.");
    }
    try {
      JWKSet jwkSet = JWKSet.parse(value);
      List<JWK> keys = jwkSet.getKeys();
      List<JsonWebKey> jsonWebKeys = keys.stream().map(JsonWebKey::new).toList();
      return new JsonWebKeys(jsonWebKeys);
    } catch (ParseException e) {
      throw new JsonWebKeyInvalidException(e.getMessage(), e);
    }
  }

  public static Map<String, Object> parsePublicKeys(String value)
      throws JsonWebKeyInvalidException {
    if (value == null || value.trim().isEmpty()) {
      throw new JsonWebKeyInvalidException(
          "JWKS value is null or empty. Client must have a valid JWKS.");
    }
    try {
      JWKSet jwkSet = JWKSet.parse(value);
      JWKSet publicJWKSet = jwkSet.toPublicJWKSet();
      return publicJWKSet.toJSONObject();
    } catch (ParseException e) {
      throw new JsonWebKeyInvalidException(e.getMessage(), e);
    }
  }
}