using System;
using System.Collections.Generic;
using System.Globalization;

namespace Questionable.Model.Questing;

public abstract class ElementId : IComparable<ElementId>, IEquatable<ElementId>
{
	public ushort Value { get; }

	protected ElementId(ushort value)
	{
		Value = value;
	}

	public int CompareTo(ElementId? other)
	{
		if ((object)this == other)
		{
			return 0;
		}
		if ((object)other == null)
		{
			return 1;
		}
		return Value.CompareTo(other.Value);
	}

	public bool Equals(ElementId? other)
	{
		if ((object)other == null)
		{
			return false;
		}
		if ((object)this == other)
		{
			return true;
		}
		if (other.GetType() != GetType())
		{
			return false;
		}
		return Value == other.Value;
	}

	public override bool Equals(object? obj)
	{
		if (obj == null)
		{
			return false;
		}
		if (this == obj)
		{
			return true;
		}
		if (obj.GetType() != GetType())
		{
			return false;
		}
		return Equals((ElementId)obj);
	}

	public override int GetHashCode()
	{
		return Value.GetHashCode();
	}

	public static bool operator ==(ElementId? left, ElementId? right)
	{
		return object.Equals(left, right);
	}

	public static bool operator !=(ElementId? left, ElementId? right)
	{
		return !object.Equals(left, right);
	}

	public static ElementId FromString(string value)
	{
		if (value.StartsWith("U"))
		{
			return new UnlockLinkId(ushort.Parse(value.Substring(1), CultureInfo.InvariantCulture));
		}
		return new QuestId(ushort.Parse(value, CultureInfo.InvariantCulture));
	}

	public static List<ElementId> FromStrings(IEnumerable<string> values, out int skippedCount)
	{
		List<ElementId> list = new List<ElementId>();
		skippedCount = 0;
		foreach (string value in values)
		{
			if (TryFromString(value, out ElementId elementId) && elementId != null)
			{
				list.Add(elementId);
			}
			else
			{
				skippedCount++;
			}
		}
		return list;
	}

	public static bool TryFromString(string value, out ElementId? elementId)
	{
		try
		{
			elementId = FromString(value);
			return true;
		}
		catch (Exception)
		{
			elementId = null;
			return false;
		}
	}

	public abstract override string ToString();
}