using JdeScoping.DataAccess.Exceptions;
using JdeScoping.DataAccess.Interfaces;
using Microsoft.Data.SqlClient;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Oracle.ManagedDataAccess.Client;

namespace JdeScoping.DataAccess;

/// <summary>
/// Factory for creating database connections to all data sources.
/// </summary>
public class DbConnectionFactory : IDbConnectionFactory
{
    private readonly IConfiguration _configuration;
    private readonly ILogger<DbConnectionFactory> _logger;

    /// <summary>
    /// Initializes a new instance of the <see cref="DbConnectionFactory"/> class.
    /// </summary>
    /// <param name="configuration">Application configuration.</param>
    /// <param name="logger">Logger instance.</param>
    public DbConnectionFactory(IConfiguration configuration, ILogger<DbConnectionFactory> logger)
    {
        _configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    /// <inheritdoc/>
    public async Task<SqlConnection> CreateLotFinderConnectionAsync(CancellationToken ct = default)
    {
        const string dataSource = "LotFinderDB";
        var connectionString = _configuration.GetConnectionString(dataSource);

        if (string.IsNullOrEmpty(connectionString))
        {
            throw new ConnectionException(
                $"{dataSource}: Connection string not found in configuration.",
                dataSource);
        }

        try
        {
            _logger.LogDebug("Creating connection to {DataSource}", dataSource);
            var connection = new SqlConnection(connectionString);
            await connection.OpenAsync(ct).ConfigureAwait(false);
            _logger.LogDebug("Successfully connected to {DataSource}", dataSource);
            return connection;
        }
        catch (OperationCanceledException)
        {
            throw;
        }
        catch (Exception ex)
        {
            using (_logger.BeginScope(new Dictionary<string, object>
            {
                ["DataSource"] = dataSource,
                ["Operation"] = "CreateConnection"
            }))
            {
                _logger.LogError(ex, "Failed to connect to {DataSource}", dataSource);
            }

            throw new ConnectionException(
                $"{dataSource}: Failed to open connection to database.",
                dataSource,
                ex);
        }
    }

    /// <inheritdoc/>
    public async Task<OracleConnection> CreateJdeConnectionAsync(CancellationToken ct = default)
    {
        return await CreateOracleConnectionAsync("JDE", ct).ConfigureAwait(false);
    }

    /// <inheritdoc/>
    public async Task<OracleConnection> CreateJdeStageConnectionAsync(CancellationToken ct = default)
    {
        return await CreateOracleConnectionAsync("JDEStage", ct).ConfigureAwait(false);
    }

    /// <inheritdoc/>
    public async Task<OracleConnection> CreateCmsConnectionAsync(CancellationToken ct = default)
    {
        return await CreateOracleConnectionAsync("CMS", ct).ConfigureAwait(false);
    }

    /// <inheritdoc/>
    public async Task<OracleConnection> CreateGiwConnectionAsync(CancellationToken ct = default)
    {
        return await CreateOracleConnectionAsync("GIW", ct).ConfigureAwait(false);
    }

    private async Task<OracleConnection> CreateOracleConnectionAsync(string dataSource, CancellationToken ct)
    {
        var connectionString = _configuration.GetConnectionString(dataSource);

        if (string.IsNullOrEmpty(connectionString))
        {
            throw new ConnectionException(
                $"{dataSource}: Connection string not found in configuration.",
                dataSource);
        }

        try
        {
            _logger.LogDebug("Creating connection to {DataSource}", dataSource);
            var connection = new OracleConnection(connectionString);
            await connection.OpenAsync(ct).ConfigureAwait(false);
            _logger.LogDebug("Successfully connected to {DataSource}", dataSource);
            return connection;
        }
        catch (OperationCanceledException)
        {
            throw;
        }
        catch (Exception ex)
        {
            using (_logger.BeginScope(new Dictionary<string, object>
            {
                ["DataSource"] = dataSource,
                ["Operation"] = "CreateConnection"
            }))
            {
                _logger.LogError(ex, "Failed to connect to {DataSource}", dataSource);
            }

            throw new ConnectionException(
                $"{dataSource}: Failed to open connection to database.",
                dataSource,
                ex);
        }
    }
}