using System.Data;
using Galaeth.Core.Configuration;
using Galaeth.Core.Infrastructure;
using Injectio.Attributes;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Npgsql;

namespace Galaeth.DAL.Infrastructure;

/// <inheritdoc cref="Galaeth.Core.Infrastructure.IDbConnectionProvider" />
[RegisterScoped]
public class DbConnectionProvider : IDbConnectionProvider, IAsyncDisposable
{
    private readonly IOptions<DatabaseConfiguration> _databaseConfiguration;
    private readonly ILogger<DbConnectionProvider> _logger;
    private NpgsqlConnection _dbConnection;

    /// <summary>
    /// Initializes a new instance of the <see cref="DbConnectionProvider"/> class.
    /// </summary>
    /// <param name="databaseConfiguration">Instance of <see cref="IOptions{DatabaseConfiguration}"/>.</param>
    /// <param name="logger">Instance of <see cref="ILogger"/>.</param>
    public DbConnectionProvider(
        IOptions<DatabaseConfiguration> databaseConfiguration,
        ILogger<DbConnectionProvider> logger)
    {
        _databaseConfiguration = databaseConfiguration;
        _logger = logger;
    }

    /// <inheritdoc cref="Galaeth.Core.Infrastructure.IDbConnectionProvider" />
    public IDbConnection OpenConnection()
    {
        if (_dbConnection is not null)
        {
            if (_dbConnection.State == ConnectionState.Closed)
            {
                _dbConnection.Open();
            }

            return _dbConnection;
        }

        _logger.LogDebug("Opening database connection");
        _dbConnection = new NpgsqlConnection(_databaseConfiguration.Value.ConnectionString);
        _dbConnection.Open();
        return _dbConnection;
    }

    /// <inheritdoc />
    public async Task<IDbConnection> OpenConnectionAsync()
    {
        if (_dbConnection is not null)
        {
            if (_dbConnection.State == ConnectionState.Closed)
            {
                await _dbConnection.OpenAsync();
            }

            return _dbConnection;
        }

        _logger.LogDebug("Opening database connection");
        _dbConnection = new NpgsqlConnection(_databaseConfiguration.Value.ConnectionString);
        await _dbConnection.OpenAsync();
        return _dbConnection;
    }

    /// <inheritdoc />
    public async ValueTask DisposeAsync()
    {
        if (_dbConnection != null)
        {
            await _dbConnection.DisposeAsync();
        }

        GC.SuppressFinalize(this);
    }

    /// <inheritdoc />
    public void Dispose()
    {
        if (_dbConnection is null)
        {
            return;
        }

        _logger.LogDebug("Disposing database connection");
        _dbConnection.Close();
        _dbConnection.Dispose();
        _dbConnection = null;
        GC.SuppressFinalize(this);
    }
}