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// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT license.

using System;

using System.Collections;

using System.Collections.Generic;

using Microsoft.ClearScript.Util;

namespace Microsoft.ClearScript

{

internal interface IHostList

{

int Count { get; }

object this[int index] { get; set; }

}

internal sealed class HostList : IHostList

{

private readonly ScriptEngine engine;

private readonly IList list;

private readonly Type elementType;

public HostList(ScriptEngine engine, IList list, Type elementType)

{

this.engine = engine;

this.list = list;

this.elementType = elementType;

}

#region IHostList implementation

public int Count => list.Count;

public object this[int index]

{

get => engine.PrepareResult(list[index], elementType, ScriptMemberFlags.None, true);

set => list[index] = value;

}

#endregion

}

internal sealed class HostList<T> : IHostList

{

private readonly ScriptEngine engine;

private readonly IList<T> list;

public HostList(ScriptEngine engine, IList<T> list)

{

this.engine = engine;

this.list = list;

}

#region IHostList implementation

public int Count => list.Count;

public object this[int index]

{

get => engine.PrepareResult(list[index], ScriptMemberFlags.None, true);

set

{

if (!typeof(T).IsAssignableFromValue(ref value))

{

throw new InvalidOperationException("Assignment invalid due to type mismatch");

}

list[index] = (T)value;

}

}

#endregion

}

internal sealed class ReadOnlyHostList<T> : IHostList

{

private readonly ScriptEngine engine;

private readonly IReadOnlyList<T> list;

public ReadOnlyHostList(ScriptEngine engine, IReadOnlyList<T> list)

{

this.engine = engine;

this.list = list;

}

#region IHostList implementation

public int Count => list.Count;

public object this[int index]

{

get => engine.PrepareResult(list[index], ScriptMemberFlags.None, true);

set => throw new UnauthorizedAccessException("The object is read-only");

}

#endregion

}

}