namespace LaaProduction.Personalization.Repositories
{
    using LaaProduction.Personalization.Repositories.Interfaces;
    using LaaProductionSQL.Interfaces;

    using System.Collections.Generic;
    using System.Data.SqlClient;
    using System.Linq;

    internal class FunctionsRepository : IFunctionsRepository
    {
        private readonly ISQLConnection sqlConnection;

        public FunctionsRepository(ISQLConnection sqlConnection)
            => this.sqlConnection = sqlConnection;

        public void AddEmployeesFunctions(int functionId, IEnumerable<short> employees)
            => this.sqlConnection
                .CreateCommand($@"
                    INSERT INTO [UsersFunctions] ([UserId], [SoftwareFunctionId])
                    VALUES {string.Join(", ", employees.Select((x, i) => $"({new SqlParameter($"p{i}", x).SqlValue}, @{nameof(functionId)})"))}")
                .SetParameter(nameof(functionId), functionId)
                .ExecuteNonQuery();

        public int AddFunction(short softwareId, string function)
            => this.sqlConnection
                .CreateCommand($@"
                    INSERT INTO [SoftwareFunctions]	([AppId], [Function])
                    OUTPUT [inserted].[Id]
                    VALUES (@{nameof(softwareId)}, @{nameof(function)})")
                .SetParameter(nameof(softwareId), softwareId)
                .SetParameter(nameof(function), function)
                .ExecuteScalar(x => x.GetInt());

        public IEnumerable<string> All()
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT DISTINCT [SF].[Function]
                      FROM [SoftwareFunctions]	AS [SF]")
                .ExecuteReader(x => x.GetString());

        public IEnumerable<string> All(short appId)
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT [SF].[Function]
                      FROM [SoftwareFunctions]	AS [SF]
                     WHERE [SF].[AppId]			 = @{nameof(appId)}")
                .SetParameter(nameof(appId), appId)
                .ExecuteReader(x => x.GetString());

        public void Delete(short employeeId)
            => this.sqlConnection
                .CreateCommand($@"
                    DELETE FROM [UsersFunctions]
                     WHERE [UserId] = @{nameof(employeeId)}")
                .SetParameter(nameof(employeeId), employeeId)
                .ExecuteNonQuery();

        public void DeleteEmployeesFunctions(int functionId)
            => this.sqlConnection
                .CreateCommand($@"
                    DELETE 
                      FROM [UsersFunctions]
                     WHERE [SoftwareFunctionId] = @{nameof(functionId)}")
                .SetParameter(nameof(functionId), functionId)
                .ExecuteNonQuery();

        public void DeleteFunction(int functionId)
            => this.sqlConnection
                .CreateCommand($@"
                    DELETE 
                      FROM [SoftwareFunctions]
                     WHERE [Id] = @{nameof(functionId)}")
                .SetParameter(nameof(functionId), functionId)
                .ExecuteNonQuery();

        public IEnumerable<string> EmployeeAll(short employeeId)
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT [SF].[Function]
                      FROM [UsersFunctions]		AS [UF]
                      JOIN [SoftwareFunctions]	AS [SF]
                        ON [SF].[Id]			 = [UF].[SoftwareFunctionId]
                     WHERE [UF].[UserId]		 = @{nameof(employeeId)}")
                .SetParameter(nameof(employeeId), employeeId)
                .ExecuteReader(x => x.GetString());

        public bool Exists(int softwareId, int functionId)
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT COUNT(1)
                      FROM [SoftwareFunctions]
                     WHERE [AppId]  = @{nameof(softwareId)}
                       AND [Id]     = @{nameof(functionId)}")
                .SetParameter(nameof(softwareId), softwareId)
                .SetParameter(nameof(functionId), functionId)
                .FirstOrDefault(x => x.GetInt() > 0);

        public IEnumerable<string> Find(string token)
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT [SF].[Function] 
                      FROM [UsersFunctions]		AS [UF]
                      JOIN [SoftwareFunctions]	AS [SF]
                        ON [SF].[Id]			 = [UF].[SoftwareFunctionId]
                      JOIN [MitarbeiterTokens]	AS [MT]
                        ON [MT].[UserId]		 = [UF].[UserId]
                       AND [MT].[AppId]			 = [SF].[AppId]
                       AND [MT].[Token]			 = @{nameof(token)}")
                .SetParameter(nameof(token), token)
                .ExecuteReader(x => x.GetString());

        public void Insert(short employeeId, IEnumerable<string> functions)
            => this.sqlConnection
                .CreateCommand($@"
                    INSERT INTO [UsersFunctions] (
	                       [UserId]
	                     , [SoftwareFunctionId])
                    SELECT @{nameof(employeeId)}
	                     , [Id]
                      FROM [SoftwareFunctions]
                     WHERE [Function] IN ({string.Join(", ", functions.Select(x => $"'{x}'"))})")
                .SetParameter(nameof(employeeId), employeeId)
                .ExecuteNonQuery();

        public void UpdateFunction(int functionId, string function)
            => this.sqlConnection
                .CreateCommand($@"
                    UPDATE [SoftwareFunctions]
                       SET [Function] = @{nameof(function)}
                     WHERE [Id] = @{nameof(functionId)}")
                .SetParameter(nameof(functionId), functionId)
                .SetParameter(nameof(function), function)
                .ExecuteNonQuery();

        public IEnumerable<KeyValuePair<short, int>> UserFunctionsCount()
            => this.sqlConnection
                .CreateCommand($@"
                    SELECT DISTINCT 
                           [UF].[UserId]			AS [EmployeeId]
                         , COUNT([SF].[Function])	AS [Functions]
                      FROM [UsersFunctions]			AS [UF]
                      JOIN [SoftwareFunctions]		AS [SF]
                        ON [SF].[Id]				 = [UF].[SoftwareFunctionId]
                     GROUP BY [UF].[UserId]")
                .ExecuteReader(x => new KeyValuePair<short, int>(x.GetSmallint(), x.GetInt()));
    }
}