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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MediaBrowser.Model.Logging;
namespace MediaBrowser.Server.Implementations.Persistence
{
/// <summary>
/// Class SQLiteExtensions
/// </summary>
public static class SqliteExtensions
{
/// <summary>
/// Connects to db.
/// </summary>
/// <param name="dbPath">The db path.</param>
/// <param name="logger">The logger.</param>
/// <returns>Task{IDbConnection}.</returns>
/// <exception cref="System.ArgumentNullException">dbPath</exception>
public static async Task<IDbConnection> ConnectToDb(string dbPath, ILogger logger)
{
if (string.IsNullOrEmpty(dbPath))
{
throw new ArgumentNullException("dbPath");
}
logger.Info("Sqlite {0} opening {1}", SQLiteConnection.SQLiteVersion, dbPath);
var connectionstr = new SQLiteConnectionStringBuilder
{
PageSize = 4096,
CacheSize = 2000,
SyncMode = SynchronizationModes.Normal,
DataSource = dbPath,
JournalMode = SQLiteJournalModeEnum.Wal
};
var connection = new SQLiteConnection(connectionstr.ConnectionString);
await connection.OpenAsync().ConfigureAwait(false);
return connection;
}
public static void BindGetSimilarityScore(IDbConnection connection, ILogger logger)
{
var sqlConnection = (SQLiteConnection) connection;
SimiliarToFunction.Logger = logger;
sqlConnection.BindFunction(new SimiliarToFunction());
}
public static void BindFunction(this SQLiteConnection connection, SQLiteFunction function)
{
var attributes = function.GetType().GetCustomAttributes(typeof(SQLiteFunctionAttribute), true).Cast<SQLiteFunctionAttribute>().ToArray();
if (attributes.Length == 0)
{
throw new InvalidOperationException("SQLiteFunction doesn't have SQLiteFunctionAttribute");
}
connection.BindFunction(attributes[0], function);
}
}
[SQLiteFunction(Name = "GetSimilarityScore", Arguments = 12, FuncType = FunctionType.Scalar)]
public class SimiliarToFunction : SQLiteFunction
{
internal static ILogger Logger;
public override object Invoke(object[] args)
{
var score = 0;
var inputOfficialRating = args[0] as string;
var rowOfficialRating = args[1] as string;
if (!string.IsNullOrWhiteSpace(inputOfficialRating) && string.Equals(inputOfficialRating, rowOfficialRating))
{
score += 10;
}
long? inputYear = args[2] == null ? (long?)null : (long)args[2];
long? rowYear = args[3] == null ? (long?)null : (long)args[3];
if (inputYear.HasValue && rowYear.HasValue)
{
var diff = Math.Abs(inputYear.Value - rowYear.Value);
// Add if they came out within the same decade
if (diff < 10)
{
score += 2;
}
// And more if within five years
if (diff < 5)
{
score += 2;
}
}
// genres
score += GetListScore(args, 4, 5);
// tags
score += GetListScore(args, 6, 7);
// keywords
score += GetListScore(args, 8, 9);
// studios
score += GetListScore(args, 10, 11, 3);
// TODO: People
// var item2PeopleNames = allPeople.Where(i => i.ItemId == item2.Id)
//.Select(i => i.Name)
//.Where(i => !string.IsNullOrWhiteSpace(i))
//.DistinctNames()
//.ToDictionary(i => i, StringComparer.OrdinalIgnoreCase);
// points += item1People.Where(i => item2PeopleNames.ContainsKey(i.Name)).Sum(i =>
// {
// if (string.Equals(i.Type, PersonType.Director, StringComparison.OrdinalIgnoreCase) || string.Equals(i.Role, PersonType.Director, StringComparison.OrdinalIgnoreCase))
// {
// return 5;
// }
// if (string.Equals(i.Type, PersonType.Actor, StringComparison.OrdinalIgnoreCase) || string.Equals(i.Role, PersonType.Actor, StringComparison.OrdinalIgnoreCase))
// {
// return 3;
// }
// if (string.Equals(i.Type, PersonType.Composer, StringComparison.OrdinalIgnoreCase) || string.Equals(i.Role, PersonType.Composer, StringComparison.OrdinalIgnoreCase))
// {
// return 3;
// }
// if (string.Equals(i.Type, PersonType.GuestStar, StringComparison.OrdinalIgnoreCase) || string.Equals(i.Role, PersonType.GuestStar, StringComparison.OrdinalIgnoreCase))
// {
// return 3;
// }
// if (string.Equals(i.Type, PersonType.Writer, StringComparison.OrdinalIgnoreCase) || string.Equals(i.Role, PersonType.Writer, StringComparison.OrdinalIgnoreCase))
// {
// return 2;
// }
// return 1;
// });
// return points;
//Logger.Debug("Returning score {0}", score);
return score;
}
private int GetListScore(object[] args, int index1, int index2, int value = 10)
{
var score = 0;
var inputGenres = args[index1] as string;
var rowGenres = args[index2] as string;
var inputGenreList = string.IsNullOrWhiteSpace(inputGenres) ? new string[] { } : inputGenres.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
var rowGenresList = string.IsNullOrWhiteSpace(rowGenres) ? new string[] { } : rowGenres.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var genre in inputGenreList)
{
if (rowGenresList.Contains(genre, StringComparer.OrdinalIgnoreCase))
{
score += value;
}
}
return score;
}
}
}
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