namespace NeonSprawl.Server.Game.Factions;

/// <summary>PostgreSQL-backed append-only reputation delta audit log (NEO-135).</summary>
public sealed class PostgresReputationDeltaStore(Npgsql.NpgsqlDataSource dataSource) : IReputationDeltaStore
{
    /// <inheritdoc />
    public bool TryAppend(ReputationDeltaRow row)
    {
        if (!IsValidRow(row))
        {
            return false;
        }

        var normalized = row with
        {
            Id = row.Id.Trim(),
            PlayerId = FactionStandingIds.NormalizePlayerId(row.PlayerId),
            FactionId = FactionStandingIds.NormalizeFactionId(row.FactionId),
            SourceKind = row.SourceKind.Trim(),
            SourceId = row.SourceId.Trim(),
        };

        PostgresReputationDeltaBootstrap.EnsureSchema(dataSource);
        using var conn = dataSource.OpenConnection();
        using var cmd = new Npgsql.NpgsqlCommand(
            """
            INSERT INTO reputation_delta_audit (
                id, player_id, faction_id, delta_amount, resulting_standing, source_kind, source_id, recorded_at)
            VALUES (@id, @pid, @fid, @delta, @result, @kind, @source_id, @recorded)
            ON CONFLICT (id) DO NOTHING;
            """,
            conn);
        cmd.Parameters.AddWithValue("id", normalized.Id);
        cmd.Parameters.AddWithValue("pid", normalized.PlayerId);
        cmd.Parameters.AddWithValue("fid", normalized.FactionId);
        cmd.Parameters.AddWithValue("delta", normalized.DeltaAmount);
        cmd.Parameters.AddWithValue("result", normalized.ResultingStanding);
        cmd.Parameters.AddWithValue("kind", normalized.SourceKind);
        cmd.Parameters.AddWithValue("source_id", normalized.SourceId);
        cmd.Parameters.AddWithValue("recorded", normalized.RecordedAt);
        return cmd.ExecuteNonQuery() == 1;
    }

    /// <inheritdoc />
    public IReadOnlyList<ReputationDeltaRow> GetDeltasForPlayer(string playerId, int? limit = null)
    {
        var player = FactionStandingIds.NormalizePlayerId(playerId);
        if (player.Length == 0)
        {
            return [];
        }

        PostgresReputationDeltaBootstrap.EnsureSchema(dataSource);
        using var conn = dataSource.OpenConnection();
        var sql = limit is > 0
            ? """
              SELECT id, player_id, faction_id, delta_amount, resulting_standing, source_kind, source_id, recorded_at
              FROM reputation_delta_audit
              WHERE player_id = @pid
              ORDER BY recorded_at ASC, id ASC
              LIMIT @lim;
              """
            : """
              SELECT id, player_id, faction_id, delta_amount, resulting_standing, source_kind, source_id, recorded_at
              FROM reputation_delta_audit
              WHERE player_id = @pid
              ORDER BY recorded_at ASC, id ASC;
              """;
        using var cmd = new Npgsql.NpgsqlCommand(sql, conn);
        cmd.Parameters.AddWithValue("pid", player);
        if (limit is > 0)
        {
            cmd.Parameters.AddWithValue("lim", limit.Value);
        }

        var rows = new List<ReputationDeltaRow>();
        using var reader = cmd.ExecuteReader();
        while (reader.Read())
        {
            rows.Add(new ReputationDeltaRow(
                reader.GetString(0),
                reader.GetString(1),
                reader.GetString(2),
                reader.GetInt32(3),
                reader.GetInt32(4),
                reader.GetString(5),
                reader.GetString(6),
                reader.GetFieldValue<DateTimeOffset>(7)));
        }

        return rows;
    }

    private static bool IsValidRow(ReputationDeltaRow row) =>
        row.Id.Trim().Length > 0 &&
        FactionStandingIds.NormalizePlayerId(row.PlayerId).Length > 0 &&
        FactionStandingIds.NormalizeFactionId(row.FactionId).Length > 0 &&
        row.SourceKind.Trim().Length > 0 &&
        row.SourceId.Trim().Length > 0;
}