/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * 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 com.android.bluetooth.avrcpcontroller;

import android.util.Log;

import java.util.Date;
import java.util.Objects;

/**
 * Represents BIP attachment metadata arriving from a GetImageProperties request.
 *
 * Content type is the only spec-required field.
 *
 * Examples:
 *   <attachment content-type="text/plain" name="ABCD1234.txt" size="5120"/>
 *   <attachment content-type="audio/basic" name="ABCD1234.wav" size="102400"/>
 */
public class BipAttachmentFormat {
    private static final String TAG = "avrcpcontroller.BipAttachmentFormat";

    /**
     * MIME content type of the image attachment, i.e. "text/plain"
     *
     * This is required by the specification
     */
    private final String mContentType;

    /**
     * MIME character set of the image attachment, i.e. "ISO-8859-1"
     */
    private final String mCharset;

    /**
     * File name of the image attachment
     *
     * This is required by the specification
     */
    private final String mName;

    /**
     * Size of the image attachment in bytes
     */
    private final int mSize;

    /**
     * Date the image attachment was created
     */
    private final BipDateTime mCreated;

    /**
     * Date the image attachment was last modified
     */
    private final BipDateTime mModified;

    public BipAttachmentFormat(String contentType, String charset, String name, String size,
            String created, String modified) {
        if (contentType == null) {
            throw new ParseException("ContentType is required and must be valid");
        }
        if (name == null) {
            throw new ParseException("Name is required and must be valid");
        }

        mContentType = contentType;
        mName = name;
        mCharset = charset;
        mSize = parseInt(size);

        BipDateTime bipCreated = null;
        try {
            bipCreated = new BipDateTime(created);
        } catch (ParseException e) {
            bipCreated = null;
        }
        mCreated = bipCreated;

        BipDateTime bipModified = null;
        try {
            bipModified = new BipDateTime(modified);
        } catch (ParseException e) {
            bipModified = null;
        }
        mModified = bipModified;
    }

    public BipAttachmentFormat(String contentType, String charset, String name, int size,
            Date created, Date modified) {
        mContentType = Objects.requireNonNull(contentType, "Content-Type cannot be null");
        mName = Objects.requireNonNull(name, "Name cannot be null");
        mCharset = charset;
        mSize = size;
        mCreated = created != null ? new BipDateTime(created) : null;
        mModified = modified != null ? new BipDateTime(modified) : null;
    }

    private static int parseInt(String s) {
        if (s == null) return -1;
        try {
            return Integer.parseInt(s);
        } catch (NumberFormatException e) {
            Log.e(TAG, "Invalid number format for '" + s + "'");
        }
        return -1;
    }

    public String getContentType() {
        return mContentType;
    }

    public String getName() {
        return mName;
    }

    public String getCharset() {
        return mCharset;
    }

    public int getSize() {
        return mSize;
    }

    public BipDateTime getCreatedDate() {
        return mCreated;
    }

    public BipDateTime getModifiedDate() {
        return mModified;
    }

    @Override
    public boolean equals(Object o) {
        if (o == this) return true;
        if (!(o instanceof BipAttachmentFormat)) return false;

        BipAttachmentFormat a = (BipAttachmentFormat) o;
        return a.getContentType() == getContentType()
                && a.getName() == getName()
                && a.getCharset() == getCharset()
                && a.getSize() == getSize()
                && a.getCreatedDate() == getCreatedDate()
                && a.getModifiedDate() == getModifiedDate();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("<attachment");
        sb.append(" content-type=\"" + mContentType + "\"");
        if (mCharset != null) sb.append(" charset=\"" + mCharset + "\"");
        sb.append(" name=\"" + mName + "\"");
        if (mSize > -1) sb.append(" size=\"" + mSize + "\"");
        if (mCreated != null) sb.append(" created=\"" + mCreated.toString() + "\"");
        if (mModified != null) sb.append(" modified=\"" + mModified.toString() + "\"");
        sb.append(" />");
        return sb.toString();
    }
}