using MongoDB.Driver;
using MongoDB.Driver.Linq;
using MongoDbGenericRepository.DataAccess.Read;
using MongoDbGenericRepository.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace MongoDbGenericRepository
{
    public interface IBaseReadOnlyRepository
    {
        /// <summary>
        /// The connection string.
        /// </summary>
        string ConnectionString { get; }

        /// <summary>
        /// The database name.
        /// </summary>
        string DatabaseName { get; }

        #region Read TKey

        /// <summary>
        /// Asynchronously returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="id">The Id of the document you want to get.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        Task<TDocument> GetByIdAsync<TDocument, TKey>(TKey id, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="id">The Id of the document you want to get.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        TDocument GetById<TDocument, TKey>(TKey id, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Asynchronously returns one document given an expression filter.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        Task<TDocument> GetOneAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Returns one document given an expression filter.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        TDocument GetOne<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Returns a collection cursor.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        IFindFluent<TDocument, TDocument> GetCursor<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;


        /// <summary>
        /// Returns true if any of the document of the collection matches the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        Task<bool> AnyAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Returns true if any of the document of the collection matches the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        bool Any<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Asynchronously returns a list of the documents matching the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        Task<List<TDocument>> GetAllAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Returns a list of the documents matching the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        List<TDocument> GetAll<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Asynchronously counts how many documents match the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partitionKey</param>
        Task<long> CountAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Counts how many documents match the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partitionKey</param>
        long Count<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        #endregion

        #region Min / Max

        /// <summary>
        /// Gets the document with the maximum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by descending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        Task<TDocument> GetByMaxAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> orderByDescending, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the document with the maximum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by descending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        TDocument GetByMax<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> orderByDescending, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the document with the minimum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        Task<TDocument> GetByMinAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> orderByAscending, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the document with the minimum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        TDocument GetByMin<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> orderByAscending, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the maximum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        Task<TValue> GetMaxValueAsync<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the maximum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        TValue GetMaxValue<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> orderByDescending, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        Task<TValue> GetMinValueAsync<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        TValue GetMinValue<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        #endregion

        #region Sum

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        Task<int> SumByAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, int>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        int SumBy<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, int>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        Task<decimal> SumByAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, decimal>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        decimal SumBy<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, decimal>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>;

        #endregion Sum
    }

    public class BaseReadOnlyRepository : IBaseReadOnlyRepository
    {
        /// <summary>
        /// The connection string.
        /// </summary>
        public string ConnectionString { get; }

        /// <summary>
        /// The database name.
        /// </summary>
        public string DatabaseName { get; }

        /// <summary>
        /// The MongoDbContext
        /// </summary>
        protected IMongoDbContext MongoDbContext = null;

        /// <summary>
        /// A MongoDb Reader for read operations
        /// </summary>
        protected MongoDbReader MongoDbReader = null;

        /// <summary>
        /// The constructor taking a connection string and a database name.
        /// </summary>
        /// <param name="connectionString">The connection string of the MongoDb server.</param>
        /// <param name="databaseName">The name of the database against which you want to perform operations.</param>
        protected BaseReadOnlyRepository(string connectionString, string databaseName = null)
        {
            if (databaseName == null)
            {
                var mongoUrl = new MongoUrl(connectionString);
                databaseName = databaseName ?? mongoUrl.DatabaseName;
            }
            ConnectionString = connectionString;
            DatabaseName = databaseName;
            SetupMongoDbContext(new MongoDbContext(connectionString, databaseName));
        }

        /// <summary>
        /// The contructor taking a <see cref="IMongoDbContext"/>.
        /// </summary>
        /// <param name="mongoDbContext">A mongodb context implementing <see cref="IMongoDbContext"/></param>
        protected BaseReadOnlyRepository(IMongoDbContext mongoDbContext)
        {
            SetupMongoDbContext(mongoDbContext);
        }

        /// <summary>
        /// The contructor taking a <see cref="IMongoDatabase"/>.
        /// </summary>
        /// <param name="mongoDatabase">A mongodb context implementing <see cref="IMongoDatabase"/></param>
        protected BaseReadOnlyRepository(IMongoDatabase mongoDatabase)
        {
            SetupMongoDbContext(new MongoDbContext(mongoDatabase));
        }

        protected void SetupMongoDbContext(IMongoDbContext mongoDbContext)
        {
            MongoDbContext = mongoDbContext;
            MongoDbReader = new MongoDbReader(MongoDbContext);
        }

        #region Read TKey

        /// <summary>
        /// Asynchronously returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="id">The Id of the document you want to get.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public async virtual Task<TDocument> GetByIdAsync<TDocument, TKey>(TKey id, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetByIdAsync<TDocument, TKey>(id, partitionKey);
        }

        /// <summary>
        /// Returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="id">The Id of the document you want to get.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual TDocument GetById<TDocument, TKey>(TKey id, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetById<TDocument, TKey>(id, partitionKey);
        }

        /// <summary>
        /// Asynchronously returns one document given an expression filter.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public async virtual Task<TDocument> GetOneAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetOneAsync<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Returns one document given an expression filter.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual TDocument GetOne<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetOne<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Returns a collection cursor.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual IFindFluent<TDocument, TDocument> GetCursor<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetCursor<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Returns true if any of the document of the collection matches the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public async virtual Task<bool> AnyAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.AnyAsync<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Returns true if any of the document of the collection matches the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual bool Any<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.Any<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Asynchronously returns a list of the documents matching the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public async virtual Task<List<TDocument>> GetAllAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetAllAsync<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Returns a list of the documents matching the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual List<TDocument> GetAll<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetAll<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Asynchronously counts how many documents match the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partitionKey</param>
        public async virtual Task<long> CountAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.CountAsync<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Counts how many documents match the filter condition.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <typeparam name="TKey">The type of the primary key for a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partitionKey</param>
        public virtual long Count<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.Count<TDocument, TKey>(filter, partitionKey);
        }

        /// <summary>
        /// Gets the document with the maximum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="maxValueSelector">A property selector to order by descending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public async virtual Task<TDocument> GetByMaxAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetByMaxAsync<TDocument, TKey>(filter, maxValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the document with the maximum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="maxValueSelector">A property selector to order by descending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public virtual TDocument GetByMax<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetByMax<TDocument, TKey>(filter, maxValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the document with the minimum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public async virtual Task<TDocument> GetByMinAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetByMinAsync<TDocument, TKey>(filter, minValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the document with the minimum value of a specified property in a MongoDB collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public virtual TDocument GetByMin<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetByMin<TDocument, TKey>(filter, minValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the maximum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="orderByAscending">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public async virtual Task<TValue> GetMaxValueAsync<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetMaxValueAsync<TDocument, TKey, TValue>(filter, maxValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the maximum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="maxValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partitionKey.</param>
        public virtual TValue GetMaxValue<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetMaxValue<TDocument, TKey, TValue>(filter, maxValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual async Task<TValue> GetMinValueAsync<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.GetMinValueAsync<TDocument, TKey, TValue>(filter, minValueSelector, partitionKey);
        }

        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public virtual TValue GetMinValue<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.GetMinValue<TDocument, TKey, TValue>(filter, minValueSelector, partitionKey);
        }

        #endregion

        #region Sum TKey

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        public virtual async Task<int> SumByAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, int>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.SumByAsync<TDocument, TKey>(filter, selector, partitionKey);
        }

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        public virtual int SumBy<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, int>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.SumBy<TDocument, TKey>(filter, selector, partitionKey);
        }

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        public virtual async Task<decimal> SumByAsync<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, decimal>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return await MongoDbReader.SumByAsync<TDocument, TKey>(filter, selector, partitionKey);
        }

        /// <summary>
        /// Sums the values of a selected field for a given filtered collection of documents.
        /// </summary>
        /// <typeparam name="TDocument">The type representing a Document.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="selector">The field you want to sum.</param>
        /// <param name="partitionKey">The partition key of your document, if any.</param>
        public virtual decimal SumBy<TDocument, TKey>(Expression<Func<TDocument, bool>> filter,
                                                       Expression<Func<TDocument, decimal>> selector,
                                                       string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbReader.SumBy<TDocument, TKey>(filter, selector, partitionKey);
        }

        #endregion Sum TKey

        #region Utility Methods

        protected virtual IMongoQueryable<TDocument> GetQuery<TDocument, TKey>(Expression<Func<TDocument, bool>> filter, string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return GetCollection<TDocument, TKey>(partitionKey).AsQueryable().Where(filter);
        }

        /// <summary>
        /// Gets a collections for a potentially partitioned document type.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="document">The document.</param>
        /// <returns></returns>
        protected virtual IMongoCollection<TDocument> HandlePartitioned<TDocument, TKey>(TDocument document)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            if (document is IPartitionedDocument)
            {
                return GetCollection<TDocument, TKey>(((IPartitionedDocument)document).PartitionKey);
            }
            return GetCollection<TDocument, TKey>();
        }

        /// <summary>
        /// Gets a collections for the type TDocument with a partition key.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="partitionKey">The collection partition key.</param>
        /// <returns></returns>
        protected virtual IMongoCollection<TDocument> GetCollection<TDocument, TKey>(string partitionKey = null)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            return MongoDbContext.GetCollection<TDocument>(partitionKey);
        }

        /// <summary>
        /// Gets a collections for a potentially partitioned document type.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <param name="partitionKey">The collection partition key.</param>
        /// <returns></returns>
        protected virtual IMongoCollection<TDocument> HandlePartitioned<TDocument, TKey>(string partitionKey)
            where TDocument : IDocument<TKey>
            where TKey : IEquatable<TKey>
        {
            if (!string.IsNullOrEmpty(partitionKey))
            {
                return GetCollection<TDocument, TKey>(partitionKey);
            }
            return GetCollection<TDocument, TKey>();
        }

        /// <summary>
        /// Converts a LINQ expression of TDocument, TValue to a LINQ expression of TDocument, object
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TValue">The type of the value.</typeparam>
        /// <param name="expression">The expression to convert</param>
        protected virtual Expression<Func<TDocument, object>> ConvertExpression<TDocument, TValue>(Expression<Func<TDocument, TValue>> expression)
        {
            var param = expression.Parameters[0];
            Expression body = expression.Body;
            var convert = Expression.Convert(body, typeof(object));
            return Expression.Lambda<Func<TDocument, object>>(convert, param);
        }

        /// <summary>
        /// Maps a IndexCreationOptions object to a MongoDB.Driver.CreateIndexOptions object
        /// </summary>
        /// <param name="indexCreationOptions">The options for creating an index.</param>
        /// <returns></returns>
        protected virtual CreateIndexOptions MapIndexOptions(IndexCreationOptions indexCreationOptions)
        {
            return new CreateIndexOptions
            {
                Unique = indexCreationOptions.Unique,
                TextIndexVersion = indexCreationOptions.TextIndexVersion,
                SphereIndexVersion = indexCreationOptions.SphereIndexVersion,
                Sparse = indexCreationOptions.Sparse,
                Name = indexCreationOptions.Name,
                Min = indexCreationOptions.Min,
                Max = indexCreationOptions.Max,
                LanguageOverride = indexCreationOptions.LanguageOverride,
                ExpireAfter = indexCreationOptions.ExpireAfter,
                DefaultLanguage = indexCreationOptions.DefaultLanguage,
                BucketSize = indexCreationOptions.BucketSize,
                Bits = indexCreationOptions.Bits,
                Background = indexCreationOptions.Background,
                Version = indexCreationOptions.Version
            };
        }


        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="minValueSelector">A property selector to order by ascending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        protected virtual IFindFluent<TDocument, TDocument> GetMinMongoQuery<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
                    where TDocument : IDocument<TKey>
                    where TKey : IEquatable<TKey>
        {
            return GetCollection<TDocument, TKey>(partitionKey).Find(Builders<TDocument>.Filter.Where(filter))
                                                               .SortBy(ConvertExpression(minValueSelector))
                                                               .Limit(1);
        }

        /// <summary>
        /// Gets the minimum value of a property in a mongodb collections that is satisfying the filter.
        /// </summary>
        /// <typeparam name="TDocument">The document type.</typeparam>
        /// <typeparam name="TKey">The type of the primary key.</typeparam>
        /// <typeparam name="TValue">The type of the value used to order the query.</typeparam>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="maxValueSelector">A property selector to order by descending.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        protected virtual IFindFluent<TDocument, TDocument> GetMaxMongoQuery<TDocument, TKey, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
                    where TDocument : IDocument<TKey>
                    where TKey : IEquatable<TKey>
        {
            return GetCollection<TDocument, TKey>(partitionKey).Find(Builders<TDocument>.Filter.Where(filter))
                                                               .SortByDescending(ConvertExpression(maxValueSelector))
                                                               .Limit(1);
        }


        #endregion
    }
}