// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
 
namespace Microsoft.CodeAnalysis.Text;
 
internal static class LinePositionSpanExtensions
{
    public static void Deconstruct(this LinePositionSpan linePositionSpan, out LinePosition start, out LinePosition end)
        => (start, end) = (linePositionSpan.Start, linePositionSpan.End);
 
    public static void Deconstruct(this LinePositionSpan linePositionSpan, out int startLine, out int startCharacter, out int endLine, out int endCharacter)
        => (startLine, startCharacter, endLine, endCharacter) = (linePositionSpan.Start.Line, linePositionSpan.Start.Character, linePositionSpan.End.Line, linePositionSpan.End.Character);
 
    public static bool OverlapsWith(this LinePositionSpan span, LinePositionSpan other)
    {
        var overlapStart = span.Start;
        if (span.Start.CompareTo(other.Start) < 0)
        {
            overlapStart = other.Start;
        }
 
        var overlapEnd = span.End;
        if (span.End.CompareTo(other.End) > 0)
        {
            overlapEnd = other.End;
        }
 
        // Empty ranges do not overlap with any range.
        return overlapStart.CompareTo(overlapEnd) < 0;
    }
 
    public static bool LineOverlapsWith(this LinePositionSpan span, LinePositionSpan other)
    {
        var overlapStart = span.Start.Line < other.Start.Line
            ? other.Start.Line
            : span.Start.Line;
 
        var overlapEnd = span.End.Line > other.End.Line
            ? other.End.Line
            : span.End.Line;
 
        return overlapStart <= overlapEnd;
    }
 
    public static bool Contains(this LinePositionSpan span, LinePositionSpan other)
    {
        return span.Start <= other.Start && span.End >= other.End;
    }
 
    public static LinePositionSpan WithStart(this LinePositionSpan span, LinePosition newStart)
        => new(newStart, span.End);
 
    public static LinePositionSpan WithStart(this LinePositionSpan span, Func<LinePosition, LinePosition> computeNewStart)
        => new(computeNewStart(span.Start), span.End);
 
    public static LinePositionSpan WithEnd(this LinePositionSpan span, LinePosition newEnd)
        => new(span.Start, newEnd);
 
    public static LinePositionSpan WithEnd(this LinePositionSpan span, Func<LinePosition, LinePosition> computeNewEnd)
        => new(span.Start, computeNewEnd(span.End));
 
    public static bool SpansMultipleLines(this LinePositionSpan span)
        => span.Start.Line != span.End.Line;
}