using Newtonsoft.Json;
using System;
using System.Collections.Generic;

namespace Pilz.Cryptography;

[JsonConverter(typeof(Json.Converters.UniquieIDStringJsonConverter))]
public class UniquieID : IUniquieID
{
    protected static ulong currentSimpleID = 0;

    [JsonProperty(nameof(ID))]
    protected string _iD;

    [JsonIgnore]
    public virtual bool SimpleMode { get; }

    [JsonIgnore]
    public virtual bool GenerateOnGet { get; }

    [JsonIgnore]
    public virtual bool HasID => !string.IsNullOrEmpty(_iD);

    [JsonIgnore]
    public virtual string ID
    {
        get
        {
            if (GenerateOnGet)
                GenerateIfNull();
            return _iD;
        }
        internal set
            => _iD = value;
    }

    public UniquieID() : this(UniquieIDGenerationMode.None)
    {
    }

    public UniquieID(UniquieIDGenerationMode mode) : this(mode, false)
    {
    }

    public UniquieID(UniquieIDGenerationMode mode, bool simpleMode)
    {
        SimpleMode = simpleMode;

        if (mode == UniquieIDGenerationMode.GenerateOnInit)
            GenerateIfNull();
        else if (mode == UniquieIDGenerationMode.GenerateOnGet)
            GenerateOnGet = true;
    }

    [Obsolete]
    public UniquieID(bool autoGenerate) : this(autoGenerate ? UniquieIDGenerationMode.GenerateOnInit : UniquieIDGenerationMode.None)
    {
    }

    public virtual void Generate()
    {
        if (SimpleMode)
            ID = GenerateSimple();
        else
            ID = GenerateDefault();
    }

    protected virtual string GenerateSimple()
    {
        return new Random().Next().ToString() + DateTime.Now.ToString("yyyyMMddHHmmssfffffff") + currentSimpleID++.ToString();
    }

    protected virtual string GenerateDefault()
    {
        return Helpers.GenerateUniquieID<UniquieID>(currentSimpleID++.ToString());
    }

    public virtual void GenerateIfNull()
    {
        if (!HasID) Generate();
    }

    public override string ToString()
    {
        return ID;
    }

    public override int GetHashCode()
    {
        return -1430039477 + EqualityComparer<string>.Default.GetHashCode(_iD);
    }

    public override bool Equals(object obj)
    {
        if (obj is UniquieID iD)
        {
            if (ReferenceEquals(obj, iD))
                return true;
            else
            {
                var leftHasID = iD.HasID;
                var rightHasID = HasID;

                if (!leftHasID && iD.GenerateOnGet)
                {
                    iD.Generate();
                    leftHasID = iD.HasID;
                }

                if (!rightHasID && GenerateOnGet)
                {
                    Generate();
                    rightHasID = HasID;
                }

                if (leftHasID && rightHasID)
                    return _iD.Equals(iD._iD);
            }
        }

        return base.Equals(obj);
    }

    public static implicit operator string(UniquieID id) => id.ID;
    public static implicit operator UniquieID(string id) => new UniquieID() { ID = id };
    public static implicit operator UniquieID(int id) => new UniquieID() { ID = Convert.ToString(id) };

    public static bool operator ==(UniquieID left, UniquieID right) => left.ID.Equals(right.ID);
    public static bool operator !=(UniquieID left, UniquieID right) => !left.ID.Equals(right.ID);
}