using System;
using System.Collections.Generic;
using System.Linq;

using FrostFS.SDK.ClientV2;
using FrostFS.SDK.Cryptography;
using FrostFS.SDK.ClientV2.Mappers.GRPC;

using Google.Protobuf;

namespace FrostFS.SDK;

public class FrostFsContainerInfo
{
    private FrostFS.Container.Container.Types.Attribute[]? grpsAttributes;
    private List<FrostFsAttribute>? attributes;
    private FrostFsPlacementPolicy? placementPolicy;
    private Guid? nonce;

    private Container.Container container;

    public FrostFsContainerInfo(
        BasicAcl basicAcl, 
        FrostFsPlacementPolicy placementPolicy,
        List<FrostFsAttribute>? attributes = null,
        FrostFsVersion? version = null,
        FrostFsOwner? owner = null,
        Guid? nonce = null)
    {
        BasicAcl = basicAcl;
        this.placementPolicy = placementPolicy;
        this.attributes = attributes;
        Version = version;
        Owner = owner;
        this.nonce = nonce;
    }

    internal FrostFsContainerInfo(Container.Container container)
    {
        this.container = container;
    }
   
    public Guid Nonce 
    {
        get
        {
            nonce ??= container?.Nonce != null ? container.Nonce.ToUuid() : Guid.NewGuid();
            return nonce.Value;
        }
    } 

    public BasicAcl BasicAcl { get; private set; }

    public FrostFsPlacementPolicy? PlacementPolicy
    {
        get
        {
            placementPolicy ??= container.PlacementPolicy?.ToModel();
            return placementPolicy;
        }
    }

    public List<FrostFsAttribute>? Attributes 
    {
        get
        {
            if (attributes == null && grpsAttributes != null)
                attributes = grpsAttributes.Select(a => new FrostFsAttribute(a.Key, a.Value)).ToList();
            
            return attributes;
        }
    }

    public FrostFsVersion? Version { get; private set; }

    public FrostFsOwner? Owner { get; private set; }
    
    internal Container.Container.Types.Attribute[]? GetGrpsAttributes() 
    {
        grpsAttributes ??= Attributes?
            .Select(a => new Container.Container.Types.Attribute { Key = a.Key, Value = a.Value })
            .ToArray();

        return grpsAttributes;
    }

    internal Container.Container GetContainer()
    {
        if (this.container == null)
        {
            this.container = new Container.Container()
            {
                BasicAcl = (uint)BasicAcl,
                PlacementPolicy = PlacementPolicy.ToMessage(),
                Nonce = ByteString.CopyFrom(Nonce.ToBytes()),
                OwnerId = Owner?.OwnerID,
                Version = Version?.Version
            };

            var attribs = GetGrpsAttributes();
            if (attribs != null)
                this.container.Attributes.AddRange(attribs);
        }

        return this.container;
    }
}