using System;

namespace FrostFS.SDK;

public class FrostFsObject
{
    private byte[]? bytes;

    /// <summary>
    /// Creates new instance from <c>ObjectHeader</c>
    /// </summary>
    /// <param name="header"></param> <summary>
    public FrostFsObject(FrostFsObjectHeader header)
    {
        Header = header;
    }

    /// <summary>
    /// Creates new instance with specified parameters
    /// </summary>
    /// <param name="container"></param>
    /// <param name="objectType"></param>
    public FrostFsObject(FrostFsContainerId container, FrostFsObjectType objectType = FrostFsObjectType.Regular)
    {
        Header = new FrostFsObjectHeader(containerId: container, type: objectType);
    }

    /// <summary>
    /// Header contains metadata for the object
    /// </summary>
    /// <value></value>
    public FrostFsObjectHeader Header { get; set; }

    /// <summary>
    /// The value is calculated internally as a hash of ObjectHeader. Do not use pre-calculated value is the object has been changed.
    /// </summary>
    public FrostFsObjectId? ObjectId
    {
        get; set;
    }

    /// <summary>
    /// A payload is obtained via stream reader
    /// </summary>
    /// <value>Reader for received data</value>
    public IObjectReader? ObjectReader { get; set; }

    internal byte[] SingleObjectPayload
    {
        get { return bytes ?? []; }
    }

    /// <summary>
    /// The size of payload cannot exceed <c>MaxObjectSize</c> value from <c>NetworkSettings</c>
    /// Used only for PutSingleObject method
    /// </summary>
    /// <value>Buffer for output data</value>
    public void SetSingleObjectPayload(byte[] bytes)
    {
        this.bytes = bytes;
    }

    /// <summary>
    /// Applied only for the last Object in chain in case of manual multipart uploading
    /// </summary>
    /// <param name="largeObject">Parent for multipart object</param>
    public void SetParent(FrostFsObjectHeader largeObjectHeader)
    {
        if (Header?.Split == null)
            throw new ArgumentNullException(nameof(largeObjectHeader), "Split value must not be null");

        Header.Split.ParentHeader = largeObjectHeader;
    }
}