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using System.Diagnostics.CodeAnalysis;

using System.Text.Json;

using System.Text;

using System.Text.Json.Serialization;

namespace NpgsqlRest;

[JsonSerializable(typeof(string))]

internal partial class NpgsqlRestSerializerContext : JsonSerializerContext;

internal static class PgConverters

{

private static readonly JsonSerializerOptions plainTextSerializerOptions = new()

{

Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping,

TypeInfoResolver = new NpgsqlRestSerializerContext()

};

[UnconditionalSuppressMessage("Aot", "IL2026:RequiresUnreferencedCode",

Justification = "Serializes only string type that have AOT friendly TypeInfoResolver")]

[UnconditionalSuppressMessage("Aot", "IL3050:RequiresDynamic",

Justification = "Serializes only string type that have AOT friendly TypeInfoResolver")]

public static string SerializeString(ref string value) => JsonSerializer.Serialize(value, plainTextSerializerOptions);

public static string PgUnknownToJsonArray(ref string value)

{

if (value[0] != '(' || value[^1] != ')')

{

// should never happen

return value;

}

var len = value.Length;

var result = new StringBuilder(len * 2);

result.Append('[');

var current = new StringBuilder();

bool insideQuotes = false;

bool first = true;

for (int i = 1; i < len; i++)

{

char currentChar = value[i];

if ((currentChar == ',' || (currentChar == ')' && i == len - 1)) && !insideQuotes)

{

if (!first)

{

result.Append(',');

}

else

{

first = false;

}

if (current.Length == 0)

{

result.Append("null");

}

else

{

var segment = current.ToString();

result.Append(SerializeString(ref segment));

current.Clear();

}

else

{

if (currentChar == '"' && i < len - 2 && value[i + 1] == '"')

{

current.Append(currentChar);

i++;

continue;

}

if (currentChar == '"')

{

insideQuotes = !insideQuotes;

}

else

{

if (currentChar == '\\' && i < len - 2 && value[i + 1] == '\\')

{

i++;

current.Append(currentChar);

}

else

{

current.Append(currentChar);

}

result.Append(']');

return result.ToString();

}

public static string PgArrayToJsonArray(ref string value, ref TypeDescriptor descriptor)

{

var len = value.Length;

if (string.IsNullOrWhiteSpace(value) || len < 3 || value[0] != '{' || value[^1] != '}')

{

return value;

}

var result = new StringBuilder(len * 2);

result.Append('[');

var current = new StringBuilder();

var quoted = !(descriptor.IsNumeric || descriptor.IsBoolean || descriptor.IsJson);

bool insideQuotes = false;

bool hasQuotes = false;

bool IsNull()

{

if (current.Length == 4)

{

return

current[0] == 'N' &&

current[1] == 'U' &&

current[2] == 'L' &&

current[3] == 'L';

}

return false;

}

for (int i = 1; i < len; i++)

{

char currentChar = value[i];

if (currentChar == '"' && value[i - 1] != '\\')

{

insideQuotes = !insideQuotes;

hasQuotes = true;

}

else if ((currentChar == ',' && !insideQuotes) || currentChar == '}')

{

var currentIsNull = IsNull() && !hasQuotes;

if (quoted && !currentIsNull)

{

result.Append('"');

}

if (currentIsNull)

{

result.Append("null");

}

else

{

result.Append(current);

}

if (quoted && !currentIsNull)

{

result.Append('"');

}

if (currentChar != '}')

{

result.Append(',');

}

current.Clear();

hasQuotes = false;

}

else

{

if (descriptor.IsBoolean)

{

if (currentChar == 't')

{

current.Append("true");

}

else if (currentChar == 'f')

{

current.Append("false");

}

else

{

current.Append(currentChar);

}

else if (descriptor.IsDateTime)

{

//json time requires T between date and time

current.Append(currentChar == ' ' ? 'T' : currentChar);

}

else

{

if (currentChar == '\n')

{

current.Append("\\n");

}

else if (currentChar == '\t')

{

current.Append("\\r");

}

else if (currentChar == '\r')

{

current.Append("\\r");

}

else

{

current.Append(currentChar);

}

result.Append(']');

return result.ToString();

}

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