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// Copyright 2023 Goldman Sachs
//
// 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.finos.legend.connection;

import org.finos.legend.engine.protocol.pure.v1.packageableElement.connection.ConnectionSpecification;
import org.finos.legend.engine.shared.core.identity.Credential;
import org.finos.legend.engine.shared.core.identity.Identity;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Objects;

public abstract class ConnectionBuilder
{
    protected abstract CONNECTION getConnection(SPEC connectionSpecification, Authenticator authenticator, Identity identity) throws Exception;

    public Class getCredentialType()
    {
        return (Class) actualTypeArguments()[1];
    }

    public Class getConnectionSpecificationType()
    {
        return (Class) actualTypeArguments()[2];
    }

    protected Type[] actualTypeArguments()
    {
        Type genericSuperClass = this.getClass().getGenericSuperclass();
        ParameterizedType parameterizedType = (ParameterizedType) genericSuperClass;
        return parameterizedType.getActualTypeArguments();
    }

    public Authenticator getAuthenticatorCompatible(Authenticator authenticator)
    {
        if (!this.getCredentialType().equals(authenticator.getTargetCredentialType()))
        {
            throw new RuntimeException(String.format("Authenticator target credential type is expected to be '%s' (found: %s)", this.getCredentialType().getSimpleName(), authenticator.getTargetCredentialType().getSimpleName()));
        }
        return (Authenticator) authenticator;
    }

    public ConnectionManager getConnectionManager()
    {
        return null;
    }

    public static class Key
    {
        private final Class connectionSpecificationType;
        private final Class credentialType;

        public Key(Class connectionSpecificationType, Class credentialType)
        {
            this.connectionSpecificationType = connectionSpecificationType;
            this.credentialType = credentialType;
        }

        @Override
        public boolean equals(Object o)
        {
            if (this == o)
            {
                return true;
            }
            if (o == null || getClass() != o.getClass())
            {
                return false;
            }
            ConnectionBuilder.Key that = (ConnectionBuilder.Key) o;
            return this.connectionSpecificationType.equals(that.connectionSpecificationType) &&
                    this.credentialType.equals(that.credentialType);
        }

        @Override
        public int hashCode()
        {
            return Objects.hash(connectionSpecificationType, credentialType);
        }
    }
}