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

namespace MongoDbGenericRepository
{
    /// <summary>
    /// The ReadOnlyMongoRepository implements the readonly functionality of the IReadOnlyMongoRepository.
    /// </summary>
    public abstract partial class ReadOnlyMongoRepository : IReadOnlyMongoRepository
    {


        #region Read

        /// <summary>
        /// Asynchronously returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing 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 Task<TDocument> GetByIdAsync<TDocument>(Guid id, string partitionKey = null) where TDocument : IDocument
        {
            var filter = Builders<TDocument>.Filter.Eq("Id", id);
            return await HandlePartitioned<TDocument>(partitionKey).Find(filter).FirstOrDefaultAsync();
        }

        /// <summary>
        /// Returns one document given its id.
        /// </summary>
        /// <typeparam name="TDocument">The type representing 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 TDocument GetById<TDocument>(Guid id, string partitionKey = null) where TDocument : IDocument
        {
            var filter = Builders<TDocument>.Filter.Eq("Id", id);
            return HandlePartitioned<TDocument>(partitionKey).Find(filter).FirstOrDefault();
        }

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

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

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

        /// <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>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public async Task<bool> AnyAsync<TDocument>(Expression<Func<TDocument, bool>> filter, string partitionKey = null) where TDocument : IDocument
        {
            var count = await HandlePartitioned<TDocument>(partitionKey).CountDocumentsAsync(filter);
            return (count > 0);
        }

        /// <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>
        /// <param name="filter">A LINQ expression filter.</param>
        /// <param name="partitionKey">An optional partition key.</param>
        public bool Any<TDocument>(Expression<Func<TDocument, bool>> filter, string partitionKey = null) where TDocument : IDocument
        {
            var count = HandlePartitioned<TDocument>(partitionKey).CountDocuments(filter);
            return (count > 0);
        }

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

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

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

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

        /// <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>
        /// <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 Task<TDocument> GetByMaxAsync<TDocument>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return await GetByMaxAsync<TDocument, Guid>(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>
        /// <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>
        /// <returns></returns>
        public TDocument GetByMax<TDocument>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return GetByMax<TDocument, Guid>(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>
        /// <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 Task<TDocument> GetByMinAsync<TDocument>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return await GetByMinAsync<TDocument, Guid>(filter, minValueSelector, 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>
        /// <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 TDocument GetByMin<TDocument>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, object>> orderByAscending, string partitionKey = null)
            where TDocument : IDocument
        {
            return GetByMin<TDocument, Guid>(filter, orderByAscending, 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="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 async Task<TValue> GetMaxValueAsync<TDocument, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return await GetMaxValueAsync<TDocument, Guid, 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="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 TValue GetMaxValue<TDocument, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> maxValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return GetMaxValue<TDocument, Guid, 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="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, TValue>(Expression<Func<TDocument, bool>> filter, Expression<Func<TDocument, TValue>> minValueSelector, string partitionKey = null)
            where TDocument : IDocument
        {
            return GetMinValue<TDocument, Guid, TValue>(filter, minValueSelector, partitionKey);
        }

        #endregion
    }
}