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

namespace MongoDbGenericRepository
{
    /// <summary>
    /// The base Repository, it is meant to be inherited from by your custom custom MongoRepository implementation.
    /// Its constructor must be given a connection string and a database name.
    /// </summary>
    public abstract class ReadOnlyMongoRepository : KeyTypedReadOnlyMongoRepository<Guid>, IReadOnlyMongoRepository
    {
        /// <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 ReadOnlyMongoRepository(string connectionString, string databaseName = null) : base(connectionString, databaseName)
        {
        }

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

        /// <summary>
        /// The contructor taking a <see cref="IMongoDatabase"/>.
        /// </summary>
        /// <param name="mongoDatabase">A mongodb context implementing <see cref="IMongoDatabase"/></param>
        protected ReadOnlyMongoRepository(IMongoDatabase mongoDatabase) : base(mongoDatabase)
        {
        }


        #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

    }
}