// 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 Microsoft.CodeAnalysis.Text;
 
namespace Microsoft.CodeAnalysis.Formatting.Rules;
 
/// <summary>
/// set indentation level for the given text span. it can be relative, absolute or dependent to other tokens
/// </summary>
internal sealed class IndentBlockOperation
{
    internal IndentBlockOperation(SyntaxToken startToken, SyntaxToken endToken, TextSpan textSpan, int indentationDelta, IndentBlockOption option)
    {
        Contract.ThrowIfFalse(option.IsMaskOn(IndentBlockOption.PositionMask));
 
        Contract.ThrowIfTrue(textSpan.Start < 0 || textSpan.Length < 0);
        Contract.ThrowIfTrue(startToken.RawKind == 0);
        Contract.ThrowIfTrue(endToken.RawKind == 0);
 
        this.BaseToken = default;
        this.TextSpan = textSpan;
 
        this.Option = option;
        this.StartToken = startToken;
        this.EndToken = endToken;
 
        this.IsRelativeIndentation = false;
        this.IndentationDeltaOrPosition = indentationDelta;
    }
 
    internal IndentBlockOperation(SyntaxToken baseToken, SyntaxToken startToken, SyntaxToken endToken, TextSpan textSpan, int indentationDelta, IndentBlockOption option)
    {
        Contract.ThrowIfFalse(option.IsMaskOn(IndentBlockOption.PositionMask));
 
        Contract.ThrowIfFalse(option.IsMaskOn(IndentBlockOption.RelativePositionMask));
        Contract.ThrowIfFalse(baseToken.Span.End <= textSpan.Start);
 
        Contract.ThrowIfTrue(textSpan.Start < 0 || textSpan.Length < 0);
        Contract.ThrowIfTrue(startToken.RawKind == 0);
        Contract.ThrowIfTrue(endToken.RawKind == 0);
 
        this.BaseToken = baseToken;
        this.TextSpan = textSpan;
 
        this.Option = option;
        this.StartToken = startToken;
        this.EndToken = endToken;
 
        this.IsRelativeIndentation = true;
        this.IndentationDeltaOrPosition = indentationDelta;
    }
 
    public SyntaxToken BaseToken { get; }
    public TextSpan TextSpan { get; }
 
    public IndentBlockOption Option { get; }
 
    public SyntaxToken StartToken { get; }
    public SyntaxToken EndToken { get; }
 
    public bool IsRelativeIndentation { get; }
    public int IndentationDeltaOrPosition { get; }
 
#if DEBUG
    public override string ToString()
        => $"Indent {TextSpan} from '{StartToken}' to '{EndToken}', by {IndentationDeltaOrPosition}, with base token '{BaseToken}'";
#endif
}