using System;
using System.Linq.Expressions;
using GraphQL.Types;
using xCommons.Extensions;
using xDataService.Configuration;
using xDataService.Constants;
using xDataService.Extensions;
using xDataService.Interfaces;
using xDataService.Models;
using xModels.Base;

namespace xDataService.GraphQL
{
    public abstract class XBaseGraphQLQuery<TEntity, TKey, TGraph, TGraphKey> : ObjectGraphType, IXBaseGraphQLQuery<TEntity, TKey, TGraph, TGraphKey>
    where TEntity : XBaseEntity<TKey>
    where TGraph : IGraphType
    where TGraphKey : IGraphType
    {
        //
        protected readonly XDataServiceConfiguration configuration;
        protected readonly IXBaseRepository<TEntity, TKey> repository;
        protected readonly IXBaseGraphQLTypeHelper<TEntity, TKey> helper;

        //
        public XBaseGraphQLQuery(
            XDataServiceConfiguration configuration,
            IXBaseRepository<TEntity, TKey> repository,
            IXBaseGraphQLTypeHelper<TEntity, TKey> helper
        )
        {
            //
            this.helper = helper;
            this.repository = repository;
            this.configuration = configuration;

            //
            Name = GetType().Name;

            //
            #region Retrieve ...
            //
            // Get ...
            FieldAsync<TGraph>(
                name: helper.GetInQuerySingleName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.GetIdArgument<TGraphKey>(),
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async context =>
                await repository
                .GetAsync(
                    includeBuilder: null,
                    id: context.GetIdArgument<TKey>(),
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                )
                .ToDynamicObject()
            );

            //
            // GetAll ...
            FieldAsync<ListGraphType<TGraph>>(
                name: helper.GetInQueryCollectionName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async context =>
                await repository
                .GetAllAsync(
                    orderBuilder: null,
                    includeBuilder: null,
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                )
                .ToDynamicObject()
            );

            //
            // FindOne ...
            FieldAsync<TGraph>(
                name: helper.GetFindOneName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.SearchQueryArgument,
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async (context) =>
                {
                    //
                    var searchQuery = context.GetSearchQueryArgument();
                    Expression<Func<TEntity, bool>> whereClase = pe => pe
                        .PropValuesContains(searchQuery);

                    //
                    return await repository
                        .FindOneAsync(
                            includeBuilder: null,
                            predicate: whereClase,
                            ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                        )
                        .ToDynamicObject();
                }
            );

            //
            // FindMany ...
            FieldAsync<ListGraphType<TGraph>>(
                name: helper.GetFindManyName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.SearchQueryArgument,
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async (context) =>
                {
                    //
                    var searchQuery = context.GetSearchQueryArgument();
                    Expression<Func<TEntity, bool>> whereClase = pe => pe
                        .PropValuesContains(searchQuery);

                    //
                    return await repository
                        .FindManyAsync(
                            orderBuilder: null,
                            includeBuilder: null,
                            predicate: whereClase,
                            ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                        )
                        .ToDynamicObject();
                }
            );

            //
            // Query ...
            FieldAsync<XGraphQueryResult<TEntity, TGraph>>(
                name: helper.GetQueryName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.QueryArgument,
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async context =>
                await repository
                .QueryAsync(
                    predicate: null,
                    orderBuilder: null,
                    includeBuilder: null,
                    query: context.GetQueryArgument(),
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                )
                .ToDynamicObject()
            );

            //
            // Count ...
            FieldAsync<IntGraphType>(
                name: helper.GetCountName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async context =>
                await repository
                .CountAsync(
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                )
            );

            //
            // Exists ...
            FieldAsync<BooleanGraphType>(
                name: helper.GetExistsName(),
                arguments: new QueryArguments(
                    XGraphQLHelper.GetIdArgument<TGraphKey>(),
                    XGraphQLHelper.IgnoreSoftDeletedArgument
                ),
                resolve: async context =>
                await repository.IsExistsAsync(
                    id: context.GetIdArgument<TKey>(),
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument()
                )
            );
            #endregion
        }
    }
}