142 lines
3.8 KiB
C#
142 lines
3.8 KiB
C#
using Npgsql;
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using Backend.Interface;
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namespace Backend.DatabaseHandler;
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public sealed class PostgresUserInterestStore : IUserInterestStore
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{
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private readonly string _connectionString;
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public PostgresUserInterestStore(IConfiguration configuration)
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{
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_connectionString = configuration.GetConnectionString("MarketDataDb")
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?? throw new InvalidOperationException("Missing connection string: MarketDataDb");
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}
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public async Task<List<string>> FetchAllAsync(string user, string type)
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{
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ValidateUser(user);
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string normalizedType = NormalizeType(type);
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string sql = normalizedType == "symbol"
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? """
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SELECT symbol
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FROM user_interest_symbols
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WHERE username = @user
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ORDER BY symbol ASC;
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"""
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: """
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SELECT topic
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FROM user_interest_topics
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WHERE username = @user
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ORDER BY topic ASC;
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""";
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var results = new List<string>();
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await using var conn = new NpgsqlConnection(_connectionString);
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await conn.OpenAsync();
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await using var cmd = new NpgsqlCommand(sql, conn);
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cmd.Parameters.AddWithValue("user", user.Trim());
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await using var reader = await cmd.ExecuteReaderAsync();
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while (await reader.ReadAsync())
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{
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results.Add(reader.GetString(0));
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}
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return results;
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}
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public async Task<bool> AddAsync(string user, string type, string value)
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{
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ValidateUser(user);
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ValidateValue(value);
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string normalizedType = NormalizeType(type);
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string normalizedValue = normalizedType == "symbol"
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? value.Trim().ToUpperInvariant()
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: value.Trim();
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string sql = normalizedType == "symbol"
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? """
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INSERT INTO user_interest_symbols (username, symbol)
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VALUES (@user, @value)
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ON CONFLICT (username, symbol) DO NOTHING;
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"""
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: """
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INSERT INTO user_interest_topics (username, topic)
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VALUES (@user, @value)
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ON CONFLICT (username, topic) DO NOTHING;
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""";
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await using var conn = new NpgsqlConnection(_connectionString);
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await conn.OpenAsync();
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await using var cmd = new NpgsqlCommand(sql, conn);
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cmd.Parameters.AddWithValue("user", user.Trim());
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cmd.Parameters.AddWithValue("value", normalizedValue);
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int rows = await cmd.ExecuteNonQueryAsync();
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return rows > 0;
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}
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public async Task<bool> RemoveAsync(string user, string type, string value)
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{
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ValidateUser(user);
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ValidateValue(value);
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string normalizedType = NormalizeType(type);
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string normalizedValue = normalizedType == "symbol"
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? value.Trim().ToUpperInvariant()
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: value.Trim();
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string sql = normalizedType == "symbol"
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? """
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DELETE FROM user_interest_symbols
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WHERE username = @user AND symbol = @value;
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"""
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: """
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DELETE FROM user_interest_topics
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WHERE username = @user AND topic = @value;
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""";
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await using var conn = new NpgsqlConnection(_connectionString);
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await conn.OpenAsync();
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await using var cmd = new NpgsqlCommand(sql, conn);
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cmd.Parameters.AddWithValue("user", user.Trim());
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cmd.Parameters.AddWithValue("value", normalizedValue);
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int rows = await cmd.ExecuteNonQueryAsync();
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return rows > 0;
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}
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private static string NormalizeType(string type)
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{
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string normalized = type.Trim().ToLowerInvariant();
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return normalized switch
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{
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"symbol" => "symbol",
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"topic" => "topic",
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_ => throw new ArgumentException("Type must be either 'symbol' or 'topic'.")
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};
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}
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private static void ValidateUser(string user)
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{
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if (string.IsNullOrWhiteSpace(user))
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{
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throw new ArgumentException("User cannot be empty.");
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}
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}
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private static void ValidateValue(string value)
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{
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if (string.IsNullOrWhiteSpace(value))
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{
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throw new ArgumentException("Value cannot be empty.");
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}
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}
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} |