using Dapper;
using Shogi.Api.Repositories.Dto;
using Shogi.Api.Repositories.Dto.SessionState;
using System.Data;
using System.Data.SqlClient;
using System.Text.Json;

namespace Shogi.Api.Repositories;

public class QueryRepository(IConfiguration configuration)
{
	private readonly string connectionString = configuration.GetConnectionString("ShogiDatabase")
		?? throw new InvalidOperationException("No database configured for QueryRepository.");

	public async Task<IEnumerable<SessionDto>> ReadSessionsMetadata(string playerId)
	{
		using var connection = new SqlConnection(this.connectionString);

		var results = await connection.QueryMultipleAsync(
				"session.ReadSessionsMetadata",
				new { PlayerId = playerId },
				commandType: CommandType.StoredProcedure);

		return await results.ReadAsync<SessionDto>();
	}

	public async Task<List<SessionStateDocument>> ReadSessionSnapshots(string sessionId)
	{
		using var connection = new SqlConnection(this.connectionString);
		var command = connection.CreateCommand();
		command.CommandText = "session.ReadStatesBySession";
		command.CommandType = CommandType.StoredProcedure;
		command.Parameters.AddWithValue("SessionId", sessionId);

		await using var reader = await command.ExecuteReaderAsync();
		var documents = new List<SessionStateDocument>(20);
		while (await reader.ReadAsync())
		{
			var json = reader.GetString("Document");
			var document = JsonSerializer.Deserialize<SessionStateDocument>(json);
			if (document != null)
			{
				documents.Add(document);
			}
		}

		return documents;
	}
}