using System;
using System.Collections.Generic;
using Pithos.Core.Agents;

namespace Pithos.Core
{
    public class LocalFileComparer:EqualityComparer<CloudAction>
    {
        public override bool Equals(CloudAction x, CloudAction y)
        {
            if (x.Action != y.Action)
                return false;
            if (x.LocalFile != null && y.LocalFile != null && !x.LocalFile.FullName.Equals(y.LocalFile.FullName))
                return false;
            if (x.CloudFile != null && y.CloudFile != null )
            {
                if (x.CloudFile.X_Object_Hash == null & y.CloudFile.X_Object_Hash != null)
                    return false;
                if (x.CloudFile.X_Object_Hash != null & y.CloudFile.X_Object_Hash == null)
                    return false;
                if (x.CloudFile.X_Object_Hash == null & y.CloudFile.X_Object_Hash == null)
                    return (x.CloudFile.Name == y.CloudFile.Name);

                if (!x.CloudFile.X_Object_Hash.Equals(y.CloudFile.X_Object_Hash))
                    return false;
                //All directories have the same hash. Compare them using their names instead
                if (x.CloudFile.Content_Type == y.CloudFile.Content_Type && x.CloudFile.IsDirectory)
                {
                    return (x.CloudFile.Name == y.CloudFile.Name);
                }
            }
            if (x.CloudFile == null ^ y.CloudFile == null ||
                x.LocalFile == null ^ y.LocalFile == null)
                return false;
            return true;
        }

        public override int GetHashCode(CloudAction obj)
        {
            if (obj == null)
                return 0;
            var hash1 = (obj.LocalFile == null) ? Int32.MaxValue : obj.LocalFile.FullName.GetHashCode();
            var hash2 = Int32.MaxValue;
            if (obj.CloudFile != null)
            {
                //All directories have the same hash code. Use their name's hash code instead
                hash2 = obj.CloudFile.IsDirectory 
                            ? obj.CloudFile.Name.GetHashCode()
                            : (obj.CloudFile.X_Object_Hash!=null)
                                ? obj.CloudFile.X_Object_Hash.GetHashCode() 
                                : obj.CloudFile.Name.GetHashCode();
            }
            var hash3 = obj.Action.GetHashCode();
            return hash1 ^ hash2 & hash3;
        }
    }
}