// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the MIT license. See License.txt in the project root for license information.

using System;
using System.Diagnostics.CodeAnalysis;
using Microsoft.VisualStudio.Text;

namespace Microsoft.VisualStudio.LanguageServer.ContainedLanguage;

/// <summary>
/// The purpose of the <see cref="FileUriProvider"/> is to take something that's not always addressable (an <see cref="ITextBuffer"/>) and make it addressable.
/// This is required in LSP scenarios because everything operates off of the assumption that a document can be addressable via a <see cref="Uri"/>.
/// </summary>
internal abstract class FileUriProvider
{
    /// <summary>
    /// Gets or creates an addressable <see cref="Uri"/> for the provided <paramref name="textBuffer"/>.
    ///
    /// In the case that the <paramref name="textBuffer"/> is not currently addressable via a <see cref="Uri"/>, we create one.
    /// </summary>
    /// <param name="textBuffer">A text buffer</param>
    /// <returns>A <see cref="Uri"/> that can be used to locate the provided <paramref name="textBuffer"/>.</returns>
    public abstract Uri GetOrCreate(ITextBuffer textBuffer);

    /// <summary>
    /// Attempts to retrieve the Razor addressable <see cref="Uri"/> for the provided <paramref name="textBuffer"/>.
    /// </summary>
    /// <param name="textBuffer">A text buffer</param>
    /// <param name="uri">A <see cref="Uri"/> that can be used to locate the provided <paramref name="textBuffer"/>.</param>
    /// <returns><c>true</c> if a Razor based <see cref="Uri"/> existed on the buffer, other wise <c>false</c>.</returns>
    public abstract bool TryGet(ITextBuffer textBuffer, [NotNullWhen(returnValue: true)] out Uri? uri);

    /// <summary>
    /// Adds or updates the provided <paramref name="uri"/> for the given <paramref name="textBuffer"/> under a Razor property name.
    /// </summary>
    /// <param name="textBuffer">A text buffer</param>
    /// <param name="uri">A <see cref="Uri"/> that can be used to locate the provided <paramref name="textBuffer"/>.</param>
    public abstract void AddOrUpdate(ITextBuffer textBuffer, Uri uri);

    /// <summary>
    /// Clears all <see cref="Uri"/> related state on the provided <paramref name="buffer"/>.
    /// </summary>
    /// <param name="buffer">A text buffer</param>
    public abstract void Remove(ITextBuffer buffer);
}
