// 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.

using System;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Text;

namespace Microsoft.CodeAnalysis.CodeFixes;

/// <summary>
/// Represents a collection of <see cref="CodeFix"/>es supplied by a given fix provider
/// (such as <see cref="CodeFixProvider"/> or <see cref="IConfigurationFixProvider"/>).
/// </summary>
internal sealed class CodeFixCollection(
    object provider,
    TextSpan span,
    ImmutableArray<CodeFix> fixes,
    FixAllState? fixAllState,
    ImmutableArray<FixAllScope> supportedScopes,
    ImmutableArray<Diagnostic> diagnostics)
{
    public object Provider { get; } = provider;
    public TextSpan TextSpan { get; } = span;
    public ImmutableArray<CodeFix> Fixes { get; } = fixes.NullToEmpty();

    /// <summary>
    /// Optional fix all context, which is non-null if the given <see cref="Provider"/> supports fix all occurrences code fix.
    /// </summary>
    public FixAllState? FixAllState { get; } = fixAllState;
    public ImmutableArray<FixAllScope> SupportedScopes { get; } = supportedScopes.NullToEmpty();

    /// <summary>
    /// Diagnostics this collection of fixes can fix. This is guaranteed to be non-empty.
    /// </summary>
    public ImmutableArray<Diagnostic> Diagnostics { get; } = ThrowIfDefaultOrEmpty(diagnostics);

    private static ImmutableArray<Diagnostic> ThrowIfDefaultOrEmpty(ImmutableArray<Diagnostic> diagnostics)
    {
        Contract.ThrowIfTrue(diagnostics.IsDefaultOrEmpty);
        return diagnostics;
    }
}