using HermesSocketServer;
using Npgsql;

namespace HermesSocketLibrary.db
{
    public class Database
    {
        private readonly NpgsqlDataSource _source;
        public NpgsqlDataSource DataSource { get => _source; }


        public Database(ServerConfiguration configuration)
        {
            NpgsqlDataSourceBuilder builder = new NpgsqlDataSourceBuilder(configuration.Database.ConnectionString);
            _source = builder.Build();
        }

        public async Task Execute(string sql, IDictionary<string, object>? values, Action<NpgsqlDataReader> reading)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            if (values != null)
            {
                foreach (var entry in values)
                    command.Parameters.AddWithValue(entry.Key, entry.Value);
            }
            await command.PrepareAsync();

            await using var reader = await command.ExecuteReaderAsync();
            while (await reader.ReadAsync())
            {
                reading(reader);
            }
        }

        public async Task Execute(string sql, Action<NpgsqlCommand> action, Action<NpgsqlDataReader> reading)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            action(command);
            await command.PrepareAsync();

            await using var reader = await command.ExecuteReaderAsync();
            while (await reader.ReadAsync())
            {
                reading(reader);
            }
        }

        public async Task<int> Execute(string sql, IDictionary<string, object>? values)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            if (values != null)
            {
                foreach (var entry in values)
                    command.Parameters.AddWithValue(entry.Key, entry.Value);
            }
            await command.PrepareAsync();
            return await command.ExecuteNonQueryAsync();
        }

        public async Task<int> Execute(string sql, Action<NpgsqlCommand> prepare)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            prepare(command);
            await command.PrepareAsync();
            return await command.ExecuteNonQueryAsync();
        }

        public async Task<object?> ExecuteScalar(string sql, IDictionary<string, object>? values = null)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            if (values != null)
            {
                foreach (var entry in values)
                    command.Parameters.AddWithValue(entry.Key, entry.Value);
            }

            await command.PrepareAsync();
            return await command.ExecuteScalarAsync();
        }

        public async Task<object?> ExecuteScalarTransaction(string sql, IDictionary<string, object>? values = null)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var transaction = await connection.BeginTransactionAsync();
            await using var command = new NpgsqlCommand(sql, connection, transaction);
            if (values != null)
            {
                foreach (var entry in values)
                    command.Parameters.AddWithValue(entry.Key, entry.Value);
            }

            await command.PrepareAsync();
            var results = await command.ExecuteScalarAsync();
            await transaction.CommitAsync();
            return results;
        }

        public async Task<object?> ExecuteScalar(string sql, Action<NpgsqlCommand> action)
        {
            await using var connection = await _source.OpenConnectionAsync();
            await using var command = new NpgsqlCommand(sql, connection);
            action(command);
            await command.PrepareAsync();
            return await command.ExecuteScalarAsync();
        }
    }
}