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 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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   *
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 * 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.                                           *
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package org.apache.james.mailbox.model;

import java.io.IOException;
import java.util.Optional;

import com.google.common.io.ByteSource;

public class ParsedAttachment {
    interface Builder {
        @FunctionalInterface
        interface RequireContentType {
            RequireContent contentType(ContentType contentType);

            default RequireContent contentType(String contentType) {
                return contentType(ContentType.of(contentType));
            }
        }

        @FunctionalInterface
        interface RequireContent {
            RequireName content(ByteSource bytes);
        }

        @FunctionalInterface
        interface RequireName {
            RequireCid name(Optional name);

            default RequireCid name(String name) {
                return name(Optional.of(name));
            }

            default RequireCid noName() {
                return name(Optional.empty());
            }
        }

        @FunctionalInterface
        interface RequireCid {
            RequireIsInline cid(Optional cid);

            default RequireIsInline cid(Cid cid) {
                return cid(Optional.of(cid));
            }

            default RequireIsInline noCid() {
                return cid(Optional.empty());
            }
        }

        @FunctionalInterface
        interface RequireIsInline {
            ParsedAttachment inline(boolean isInline);

            default ParsedAttachment inline() {
                return inline(true);
            }
        }
    }

    public static Builder.RequireContentType builder() {
        return contentType -> content -> name -> cid -> isInline -> new ParsedAttachment(contentType, content, name, cid, isInline);
    }

    private final ContentType contentType;
    private final ByteSource content;
    private final Optional name;
    private final Optional cid;
    private final boolean isInline;

    private ParsedAttachment(ContentType contentType, ByteSource content, Optional name, Optional cid, boolean isInline) {
        this.contentType = contentType;
        this.content = content;
        this.name = name;
        this.cid = cid;
        this.isInline = isInline;
    }

    public ContentType getContentType() {
        return contentType;
    }

    public ByteSource getContent() {
        return content;
    }

    public Optional getName() {
        return name;
    }

    public Optional getCid() {
        return cid;
    }

    public boolean isInline() {
        return isInline;
    }

    public MessageAttachmentMetadata asMessageAttachment(AttachmentId attachmentId, long size, MessageId messageId) {
        return MessageAttachmentMetadata.builder()
            .attachment(AttachmentMetadata.builder()
                .attachmentId(attachmentId)
                .type(contentType)
                .messageId(messageId)
                .size(size)
                .build())
            .name(name)
            .cid(cid)
            .isInline(isInline)
            .build();
    }

    public MessageAttachmentMetadata asMessageAttachment(AttachmentId attachmentId, MessageId messageId) throws IOException {
        return MessageAttachmentMetadata.builder()
            .attachment(AttachmentMetadata.builder()
                .attachmentId(attachmentId)
                .type(contentType)
                .size(content.size())
                .messageId(messageId)
                .build())
            .name(name)
            .cid(cid)
            .isInline(isInline)
            .build();
    }
}