/**
    * ─────────────────────────────────────────────────────────────────────────────────────────────────┐
    * This Batch class is use for upsert Shopify's Smart collection into the Salesfroce  
    * Collection is group of products based on category 
    * Smart Collection is the collection of product which has set of rules/conditions 
    * Custom Collection is the collection of product which has not set of rules/conditions 
    * Collects all list of products which lies under the Collections 
    * Shopify API Documentation: https://shopify.dev/docs/admin-api/rest/reference
    * Create Shopify Store: https://www.shopify.com/signup?itcat=identity&itterm=create-new-store
    * Shopify API Release 2020: https://www.shopify.in/partners/blog/shopify-api-release-january-2020
    * What is Person Account in Salesforce ? https://help.salesforce.com/articleView?id=account_person.htm&type=5
    * ──────────────────────────────────────────────────────────────────────────────────────────────────
    * @author         Sumit    <sumit@hicShopify.com>
    * ────────────────────────────────────────────────────────────────────────────────────────────────── 
    */
global with sharing class FetchCollections_Batch implements Database.Batchable<Object>,Database.AllowsCallouts,database.stateful {
    
    global string collectionId{get;set;}
    String linkForNextPage = '';
    Boolean isEnd = false;
    String store = 'Default';
    String updated_at_min = '';
    String updated_at_max = '';


    List<HIC_ShopifySync__HIC_Field_Mapping__c> fieldMapping;
    list<HIC_ShopifySync__HIC_Field_Mapping__c> collectionFieldsList;
    public list<HIC_ShopifySync__HIC_Configuration__c >  configurationList = new list<HIC_ShopifySync__HIC_Configuration__c >();
    
    //Depreceated
    global FetchCollections_Batch(string collectionId){
        this.collectionId = collectionId;        
    }


    global FetchCollections_Batch(String linkForNextPage , Boolean isEnd, String Store){
        this.linkForNextPage = linkForNextPage;
        this.store = store;
    }
    global FetchCollections_Batch(String linkForNextPage , Boolean isEnd, String Store, String updated_at_min, String updated_at_max){
        this.linkForNextPage = linkForNextPage;
        this.store = store;
        this.updated_at_min = updated_at_min;
        this.updated_at_max = updated_at_max;
    }
    //Depreceated
    global FetchCollections_Batch(integer noOfPages){
       System.debug('Deprecated'); 
    } 

    //Depreceated
    global FetchCollections_Batch(String linkForNextPage , Boolean isEnd){
        this.linkForNextPage = linkForNextPage;
    }

    global Iterable<Object> start(Database.BatchableContext bc){ 
        String collectionResponse = '';
        String JSONResponse = '';

        //Get Configurations for store
        String queryConfi = 'Select '+CheckAccessibility.isAccessible('HIC_ShopifySync__Chunk_Size__c,name,HIC_ShopifySync__Default_Field_Mapping__c, HIC_ShopifySync__Opportunity_Sync__c,HIC_ShopifySync__Specify_Close_Date__c, HIC_ShopifySync__Shopify_URL__c, HIC_ShopifySync__API_Key__c, HIC_ShopifySync__Private_Key_Password__c, HIC_ShopifySync__Opportunity__c, HIC_ShopifySync__Order__c, HIC_ShopifySync__Opportunity_Line_Item__c, HIC_ShopifySync__Order_Line_Item__c, HIC_ShopifySync__Order_Fulfillment__c, HIC_ShopifySync__Person_Account__c ','HIC_ShopifySync__HIC_Configuration__c')+' from HIC_ShopifySync__HIC_Configuration__c where '+CheckAccessibility.isAccessible('HIC_ShopifySync__Store__c','HIC_ShopifySync__HIC_Configuration__c') +' = \''+store+'\' limit 1';
        configurationList = database.query(queryConfi);
        
        List<HIC_ShopifySync__HIC_Field_Mapping__c> fieldMapping = new List <HIC_ShopifySync__HIC_Field_Mapping__c>();
        String query = 'Select '+CheckAccessibility.isAccessible('HIC_ShopifySync__SF_Field__c, HIC_ShopifySync__Shopify_Fields__c, HIC_ShopifySync__Nested__c , HIC_ShopifySync__IsSFID__c, HIC_ShopifySync__Default_Value__c','HIC_ShopifySync__HIC_Field_Mapping__c')+' from HIC_ShopifySync__HIC_Field_Mapping__c Where '+CheckAccessibility.isAccessible('HIC_ShopifySync__Object_Name__c','HIC_ShopifySync__HIC_Field_Mapping__c')+' = \'HIC_ShopifySync__Collection__c\' AND '+CheckAccessibility.isAccessible('HIC_ShopifySync__Store__c','HIC_ShopifySync__HIC_Field_Mapping__c')+' = \''+store+'\' LIMIT 49999'; 
        fieldMapping = database.query(query);
        
        if(collectionId != null){
            List<Object> emptyObjectList = new List <Object>();
            isEnd = true;
            return emptyObjectList;
        }

        if(!Test.isRunningTest()){
             // Get Shopif's custom_collections JSON Response 
            if(String.isNotBlank(linkForNextPage) && !isEnd){
                JSONResponse = HIC_ShopifyUtility.fetchAllDataWithLinkForNextPage('custom_collections.json?limit='+configurationList[0].HIC_ShopifySync__Chunk_Size__c+'&page_info='+linkForNextPage, configurationList);
            }else{
                JSONResponse = HIC_ShopifyUtility.fetchAllDataWithLinkForNextPage('custom_collections.json?limit='+configurationList[0].HIC_ShopifySync__Chunk_Size__c+(updated_at_min!=''?'&updated_at_min='+updated_at_min:'')+(updated_at_max!=''?'&updated_at_max='+updated_at_max:''), configurationList);
            }
            if(String.isNotBlank(JSONResponse)){
                Map<String,Object> main = (Map<String,Object>) JSON.deserializeUntyped(JSONResponse);
                if(!main.isEmpty() && main.containskey('response') && main.containskey('link') ){
                    if( main.get('response') != null)
                    collectionResponse = String.valueof(main.get('response'));
                    if(main.get('link') != null){
                        linkForNextPage =  String.valueof(main.get('link'));
                    }else{
                        isEnd = true;
                    }
                }
            }
        }else{
            collectionResponse = '{"custom_collections": [{"id": 100793057344,            "handle": "test-collection",            "title": "Test Collection",            "updated_at": "2019-01-14T03:59:48-12:00",            "body_html": "",            "published_at": "2019-01-09T22:51:33-12:00",            "sort_order": "best-selling",            "template_suffix": "",            "disjunctive": false,            "rules": [                {                    "column": "title",                    "relation": "not_equals",                    "condition": "null"                }            ],            "published_scope": "web",            "admin_graphql_api_id": "gid://shopify/Collection/100793057344"        }    ]}';
        }
        collectionFieldsList = new List <HIC_ShopifySync__HIC_Field_Mapping__c>();
        collectionFieldsList = fieldMapping;
        Map<String, Object> meta = (Map<String, Object>) JSON.deserializeUntyped(collectionResponse);
        List<Object> objectList = (List<Object>) meta.get('custom_collections');
        
        return objectList;
    }   
    
    global void execute(Database.BatchableContext BC, List<Object> Scope){
        for(object obj : Scope){
            Map<String, Object> ObjectMap = (Map<String, Object>)obj;  
            ObjectMap.put('type',(Object)'Custom');
        }
        //Process Shopify Collection field Mapping 
        if(!Test.isRunningTest()){
            HIC_ShopifyUtility.processSobjectList(collectionFieldsList,Scope,'HIC_ShopifySync__Collection__c','HIC_ShopifySync__Shopify_Id__c',configurationList,false,store);
        }
    }
    
    global void finish(Database.BatchableContext BC){
         if(!isEnd){ 
            if(!Test.isRunningTest()){
                //Call again for next pege (Pagination)
                FetchCollections_Batch callBatchAgain = new FetchCollections_Batch(linkForNextPage,false,store,updated_at_min,updated_at_max);
                Database.executeBatch(callBatchAgain,1);
            }
        }else{ 

            //Sent Email Notification
            EmailErrorCSV.SendErrormail('HIC_ShopifySync__Collection__c');

            //Call next batch for Custom Collection's Collect
            if(!Test.isRunningTest()){
                FetchCollects_Batch callBatchAgain = new FetchCollects_Batch('',false,store,updated_at_min,updated_at_max); 
                Database.executeBatch(callBatchAgain,1);
            }
        }
    }
}