/*
 * Copyright 2010-2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.services.s3;

import static com.amazonaws.util.ValidationUtils.assertAllAreNull;

import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.services.s3.internal.S3OutpostResource;
import com.amazonaws.util.ValidationUtils;

/**
 * An {@link S3Resource} that represents an S3 access point.
 */
@SdkInternalApi
public final class S3AccessPointResource implements S3Resource {
    private static final S3ResourceType S3_RESOURCE_TYPE = S3ResourceType.ACCESS_POINT;

    private final String partition;
    private final String region;
    private final String accountId;
    private final String accessPointName;
    private final S3Resource parentS3Resource;

    private S3AccessPointResource(Builder b) {
        this.accessPointName = ValidationUtils.assertStringNotEmpty(b.accessPointName, "accessPointName");
        if (b.parentS3Resource == null) {
            this.parentS3Resource = null;
            this.partition = ValidationUtils.assertStringNotEmpty(b.partition, "partition");
            this.region = ValidationUtils.assertStringNotEmpty(b.region, "region");
            this.accountId = ValidationUtils.assertStringNotEmpty(b.accountId, "accountId");
        } else {
            this.parentS3Resource = validateParentS3Resource(b.parentS3Resource);
            assertAllAreNull("partition cannot be set on builder if it has parent resource", b.partition);
            assertAllAreNull("region cannot be set on builder if it has parent resource", b.region);
            assertAllAreNull("accountId cannot be set on builder if it has parent resource", b.accountId);
            this.partition = parentS3Resource.getPartition();
            this.region = parentS3Resource.getRegion();
            this.accountId = parentS3Resource.getAccountId();
        }
    }

    private S3Resource validateParentS3Resource(S3Resource parentS3Resource) {
        String parentResourceType = parentS3Resource.getType();
        if (!S3ResourceType.OUTPOST.toString().equals(parentResourceType)
            && !S3ResourceType.OBJECT_LAMBDAS.toString().equals(parentResourceType)) {
            throw new IllegalArgumentException("Invalid 'parentS3Resource' type. An S3 access point resource must be " +
                                               "associated with an outpost or object lambdas parent resource.");
        }
        return parentS3Resource;
    }

    /**
     * Get a new builder for this class.
     * @return A newly initialized instance of a builder.
     */
    public static Builder builder() {
        return new Builder();
    }

    /**
     * Gets the resource type for this access point.
     * @return This will always return "accesspoint".
     */
    @Override
    public String getType() {
        return S3_RESOURCE_TYPE.toString();
    }

    /**
     * Gets the Amazon Web Services partition name associated with this access point (e.g.: 'aws').
     * @return the name of the partition.
     */
    @Override
    public String getPartition() {
        return this.partition;
    }

    /**
     * Gets the Amazon Web Services region name associated with this bucket (e.g.: 'us-east-1').
     * @return the name of the region.
     */
    @Override
    public String getRegion() {
        return this.region;
    }

    /**
     * Gets the Amazon Web Services account ID associated with this bucket.
     * @return the Amazon Web Services account ID.
     */
    @Override
    public String getAccountId() {
        return this.accountId;
    }

    /**
     * Gets the name of the access point.
     * @return the name of the access point.
     */
    public String getAccessPointName() {
        return this.accessPointName;
    }

    /**
     * Gets the optional parent s3 resource
     * @return the parent s3 resource if exists, otherwise null
     */
    public S3Resource getParentS3Resource() {
        return this.parentS3Resource;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        S3AccessPointResource that = (S3AccessPointResource) o;

        if (partition != null ? ! partition.equals(that.partition) : that.partition != null) return false;
        if (region != null ? ! region.equals(that.region) : that.region != null) return false;
        if (accountId != null ? ! accountId.equals(that.accountId) : that.accountId != null) return false;
        if (parentS3Resource != null ? ! parentS3Resource.equals(that.parentS3Resource) : that.parentS3Resource != null) return false;
        return accessPointName.equals(that.accessPointName);
    }

    @Override
    public int hashCode() {
        int result = partition != null ? partition.hashCode() : 0;
        result = 31 * result + (region != null ? region.hashCode() : 0);
        result = 31 * result + (accountId != null ? accountId.hashCode() : 0);
        result = 31 * result + accessPointName.hashCode();
        result = 31 * result + (parentS3Resource != null ? parentS3Resource.hashCode() : 0);
        return result;
    }

    /**
     * A builder for {@link S3AccessPointResource} objects.
     */
    public static final class Builder {
        private String partition;
        private String region;
        private String accountId;
        private String accessPointName;
        private S3Resource parentS3Resource;

        public void setPartition(String partition) {
            this.partition = partition;
        }

        /**
         * The Amazon Web Services partition associated with the access point.
         */
        public Builder withPartition(String partition) {
            setPartition(partition);
            return this;
        }

        public void setRegion(String region) {
            this.region = region;
        }

        /**
         * The Amazon Web Services region associated with the access point.
         */
        public Builder withRegion(String region) {
            setRegion(region);
            return this;
        }

        public void setAccountId(String accountId) {
            this.accountId = accountId;
        }

        /**
         * The Amazon Web Services account ID associated with the access point.
         */
        public Builder withAccountId(String accountId) {
            setAccountId(accountId);
            return this;
        }

        public void setAccessPointName(String accessPointName) {
            this.accessPointName = accessPointName;
        }

        /**
         * The name of the S3 access point.
         */
        public Builder withAccessPointName(String accessPointName) {
            setAccessPointName(accessPointName);
            return this;
        }

        /**
         * The S3 resource this access point is associated with (contained within). Only {@link S3OutpostResource}
         * is a valid parent resource types.
         */
        public Builder withParentS3Resource(S3Resource parentS3Resource) {
            this.parentS3Resource = parentS3Resource;
            return this;
        }

        /**
         * Builds an instance of {@link S3AccessPointResource}.
         */
        public S3AccessPointResource build() {
            return new S3AccessPointResource(this);
        }
    }
}