// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#nullable enable

using System.Drawing;
using Xunit;
using static Interop;

namespace System.Windows.Forms.Metafiles
{
    internal sealed class BitBltValidator : StateValidator
    {
        private readonly Rectangle? _bounds;

        /// <param name="bounds">Optional bounds to validate.</param>
        /// <param name="stateValidators">Optional device context state validation to perform.</param>
        public BitBltValidator(
            RECT? bounds,
            params IStateValidator[] stateValidators) : base(stateValidators)
        {
            _bounds = bounds;
        }

        public override bool ShouldValidate(Gdi32.EMR recordType) => recordType == Gdi32.EMR.BITBLT;

        public override unsafe void Validate(ref EmfRecord record, DeviceContextState state, out bool complete)
        {
            base.Validate(ref record, state, out _);

            // We're only checking one BitBlt record, so this call completes our work.
            complete = true;

            if (_bounds.HasValue)
            {
                EMRBITBLT* bitBlt = record.BitBltRecord;
                Assert.Equal(_bounds.Value, (Rectangle)bitBlt->rclBounds);
            }
        }
    }
}
