// 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.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Syntax;
 
namespace Microsoft.CodeAnalysis.CSharp.Extensions;
 
internal static class QueryExpressionSyntaxExtensions
{
    public static IList<SyntaxNode> GetAllClauses(this QueryExpressionSyntax query)
    {
        var result = new List<SyntaxNode>
        {
            query.FromClause
        };
        result.AddRange(query.Body.Clauses);
        result.Add(query.Body.SelectOrGroup);
        return result;
    }
 
    public static IList<SyntaxNode> GetAllClauses(this QueryBodySyntax body)
    {
        var result = new List<SyntaxNode>();
        result.AddRange(body.Clauses);
        result.Add(body.SelectOrGroup);
        return result;
    }
 
    public static QueryExpressionSyntax WithAllClauses(
        this QueryExpressionSyntax query,
        IList<SyntaxNode> allClauses)
    {
        var fromClause = (FromClauseSyntax)allClauses.First();
        return query.WithFromClause(fromClause).WithBody(query.Body.WithAllClauses(allClauses.Skip(1)));
    }
 
    public static QueryBodySyntax WithAllClauses(
        this QueryBodySyntax body,
        IEnumerable<SyntaxNode> allClauses)
    {
        var clauses = SyntaxFactory.List(allClauses.Take(allClauses.Count() - 1).Cast<QueryClauseSyntax>());
        var selectOrGroup = (SelectOrGroupClauseSyntax)allClauses.Last();
        return body.WithClauses(clauses).WithSelectOrGroup(selectOrGroup);
    }
}