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 {
        //
        private readonly XDataServiceConfiguration configuration;
        private readonly IXBaseRepository<TEntity, TKey> repository;
        private 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,
                    XGraphQLHelper.ContainsDetailArgument
                ),
                resolve : async context =>
                await repository
                .GetAsync (
                    id: context.GetIdArgument<TKey> (),
                    ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument (),
                    containsDetail: context.GetContainsDetailArgument ()
                )
                .ToDynamicObject ()
            );

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

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

                    //
                    return await repository
                        .FindOneAsync (
                            whereClause: whereClase,
                            ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument (),
                            containsDetail: context.GetContainsDetailArgument ()
                        )
                        .ToDynamicObject ();
                }
            );

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

                    //
                    return await repository
                        .FindManyAsync (
                            whereClause: whereClase,
                            ignoreSoftDeleteds: context.GetIgnoreSoftDeletedArgument (),
                            containsDetail: context.GetContainsDetailArgument ()
                        )
                        .ToDynamicObject ();
                }
            );

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

            //
            // Count ...
            FieldAsync<IntGraphType> (
                name: helper.GetCountName (),
                resolve: async context =>
                await repository
                .CountAsync ()
            );

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