using System;

using NodaTime;

using Npgsql.BackendMessages;

using Npgsql.Internal;

using Npgsql.Internal.TypeHandling;

using Npgsql.PostgresTypes;

using BclTimeTzHandler = Npgsql.Internal.TypeHandlers.DateTimeHandlers.TimeTzHandler;

namespace Npgsql.NodaTime.Internal;

sealed partial class TimeTzHandler : NpgsqlSimpleTypeHandler<OffsetTime>, INpgsqlSimpleTypeHandler<DateTimeOffset>

{

readonly BclTimeTzHandler _bclHandler;

internal TimeTzHandler(PostgresType postgresType)

: base(postgresType)

=> _bclHandler = new BclTimeTzHandler(postgresType);

// Adjust from 1 microsecond to 100ns. Time zone (in seconds) is inverted.

public override OffsetTime Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription = null)

=> new(

LocalTime.FromTicksSinceMidnight(buf.ReadInt64() * 10),

Offset.FromSeconds(-buf.ReadInt32()));

public override int ValidateAndGetLength(OffsetTime value, NpgsqlParameter? parameter) => 12;

public override void Write(OffsetTime value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)

{

buf.WriteInt64(value.TickOfDay / 10);

buf.WriteInt32(-(int)(value.Offset.Ticks / NodaConstants.TicksPerSecond));

}

DateTimeOffset INpgsqlSimpleTypeHandler<DateTimeOffset>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)

=> _bclHandler.Read<DateTimeOffset>(buf, len, fieldDescription);

int INpgsqlSimpleTypeHandler<DateTimeOffset>.ValidateAndGetLength(DateTimeOffset value, NpgsqlParameter? parameter)

=> _bclHandler.ValidateAndGetLength(value, parameter);

void INpgsqlSimpleTypeHandler<DateTimeOffset>.Write(DateTimeOffset value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)

=> _bclHandler.Write(value, buf, parameter);

}