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using System.Buffers;

using System.Runtime.CompilerServices;

using System.Text.RegularExpressions;

namespace NpgsqlRest;

public static partial class Parser

{

// SIMD-accelerated search for wildcard characters

private static readonly SearchValues<char> WildcardChars = SearchValues.Create("*?");

[GeneratedRegex(@"^(\d*\.?\d+)\s*([a-z]*)$", RegexOptions.Compiled | RegexOptions.IgnoreCase)]

private static partial Regex IntervalRegex();

public static TimeSpan? ParsePostgresInterval(string? interval)

{

if (string.IsNullOrWhiteSpace(interval))

{

return null;

}

interval = interval.Trim().ToLowerInvariant();

// Match number (integer or decimal) followed by optional space and optional unit

var match = IntervalRegex().Match(interval);

if (!match.Success)

{

return null;

}

string numberPart = match.Groups[1].Value;

string unitPart = match.Groups[2].Value;

if (!double.TryParse(numberPart, System.Globalization.NumberStyles.Any,

System.Globalization.CultureInfo.InvariantCulture, out double value))

{

return null;

}

// If no unit provided, default to seconds

if (string.IsNullOrEmpty(unitPart))

{

return TimeSpan.FromSeconds(value);

}

// Map PostgreSQL units to TimeSpan conversions

return unitPart switch

{

"us" or "usec" or "microsecond" or "microseconds" => TimeSpan.FromMicroseconds(value),

"ms" or "msec" or "millisecond" or "milliseconds" => TimeSpan.FromMilliseconds(value),

"s" or "sec" or "second" or "seconds" => TimeSpan.FromSeconds(value),

"m" or "min" or "minute" or "minutes" => TimeSpan.FromMinutes(value),

"h" or "hour" or "hours" => TimeSpan.FromHours(value),

"d" or "day" or "days" => TimeSpan.FromDays(value),

"w" or "week" or "weeks" => TimeSpan.FromDays(value * 7),

_ => null

};

}

[MethodImpl(MethodImplOptions.AggressiveInlining)]

public static bool IsPatternMatch(string name, string pattern)

{

if (name == null || pattern == null) return false;

int nl = name.Length, pl = pattern.Length;

if (nl == 0 || pl == 0) return false;

// Check if pattern contains ** (double-star / recursive glob)

// When ** is present, we're in "path glob mode": * doesn't cross /

// When ** is absent, * matches everything including / (backward compatible)

bool hasDoubleStar = pattern.Contains("**");

// Fast path: extension matching (*.ext) — only when no double-star

if (!hasDoubleStar && pl > 1 && pattern[0] == Consts.Multiply && pattern[1] == Consts.Dot)

{

ReadOnlySpan<char> ext = pattern.AsSpan(1);

return nl > ext.Length && name.AsSpan(nl - ext.Length).Equals(ext, StringComparison.OrdinalIgnoreCase);

}

// Check if pattern has wildcards using SIMD

ReadOnlySpan<char> patternSpan = pattern.AsSpan();

int firstWildcard = patternSpan.IndexOfAny(WildcardChars);

// Fast path: no wildcards - simple case-insensitive comparison

if (firstWildcard == -1)

{

return name.AsSpan().Equals(patternSpan, StringComparison.OrdinalIgnoreCase);

}

// Fast path: pattern starts with literal segment

if (firstWildcard > 0)

{

// Check if name starts with the literal prefix

if (!name.AsSpan(0, Math.Min(firstWildcard, nl)).Equals(patternSpan.Slice(0, Math.Min(firstWildcard, nl)), StringComparison.OrdinalIgnoreCase))

{

return false;

}

if (hasDoubleStar)

{

// Path glob mode: * doesn't cross /, ** crosses /

// Track two backtrack points: most recent * and most recent **

int ni2 = 0, pi2 = 0;

int singleStarPi = -1, singleStarNi = 0;

int doubleStarPi = -1, doubleStarNi = 0;

while (ni2 < nl)

{

if (pi2 < pl)

{

char pc = pattern[pi2];

if (pc == Consts.Multiply)

{

bool isDouble = (pi2 + 1 < pl && pattern[pi2 + 1] == Consts.Multiply);

if (isDouble)

{

pi2 += 2;

if (pi2 < pl && pattern[pi2] == '/') pi2++;

doubleStarPi = pi2;

doubleStarNi = ni2;

singleStarPi = -1;

}

else

{

pi2++;

singleStarPi = pi2;

singleStarNi = ni2;

}

continue;

}

if (pc == Consts.Question ? ni2 < nl : char.ToLowerInvariant(pc) == char.ToLowerInvariant(name[ni2]))

{

ni2++;

pi2++;

continue;

}

if (singleStarPi >= 0)

{

if (name[singleStarNi] != '/')

{

singleStarNi++;

ni2 = singleStarNi;

pi2 = singleStarPi;

continue;

}

if (doubleStarPi >= 0)

{

doubleStarNi++;

ni2 = doubleStarNi;

pi2 = doubleStarPi;

singleStarPi = -1;

continue;

}

return false;

}

while (pi2 < pl && pattern[pi2] == Consts.Multiply) pi2++;

return pi2 == pl;

}

// Standard wildcard matching (no **): * matches everything including /

int ni = 0, pi = 0;

int lastStar = -1, lastMatch = 0;

while (ni < nl)

{

if (pi < pl)

{

char pc = pattern[pi];

if (pc == Consts.Multiply)

{

lastStar = pi++;

lastMatch = ni;

continue;

}

if (pc == Consts.Question ? ni < nl : char.ToLowerInvariant(pc) == char.ToLowerInvariant(name[ni]))

{

ni++;

pi++;

continue;

}

if (lastStar >= 0)

{

pi = lastStar + 1;

ni = ++lastMatch;

continue;

}

return false;

}

while (pi < pl && pattern[pi] == Consts.Multiply) pi++;

return pi == pl;

}

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