Danica Weber | Final Project | Rad Women

Danica Weber | Final Project | Rad Women

trigger StockItemTrigger on Stock_Item__c (before insert, before delete) {
    // Before Insert Handling
    if (Trigger.isInsert && Trigger.isBefore) {
        // Call the class in your handler for before insert
        StockItemHandler.onBeforeInsert(Trigger.new);
    }

    // Before Delete Handling
    if (Trigger.isDelete && Trigger.isBefore) {
        // Call the class in your handler for before delete
        StockItemHandler.onBeforeDelete(Trigger.old);
    }
}

// A Utility class to process Stock Item records from the Stock Item Handler

public with sharing class StockItemHandler {

    // Constructor for the StockItemHandler class
    public StockItemHandler() {
    }
    
    // Method to be called before inserting new Stock_Item__c records
    public static void OnBeforeInsert(List<Stock_Item__c> newStockItems) {
        
        // Map to hold existing stock items with their names as keys
        Map<String, Stock_Item__c> stockItemMap = new Map<String, Stock_Item__c>();
        
        // Set to collect unique item names from new stock items
        Set<String> stockItemSet = new Set<String>();
        
        // Loop through new stock items to add their names to the set
        for (Stock_Item__c si : newStockItems) {
            stockItemSet.add(si.Item_Name__c);
            System.debug(si.Item_Name__c); // Debug log to print the item name
        }
        
        // Query existing stock items that have the same names as new stock items
        for (Stock_Item__c s : [SELECT ID, Item_Name__c 
                                FROM Stock_Item__c 
                                WHERE Item_Name__c IN :stockItemSet 
                                LIMIT 20]) {
            stockItemMap.put(s.Item_Name__c, s); // Add existing items to the map
        }
        
        // Loop through new stock items to check for duplicates
        for (Stock_Item__c dupItems : newStockItems) {
            if (stockItemMap.containsKey(dupItems.Item_Name__c)) {
                // Append ' * Duplicate Item' to the name of duplicate items
                dupItems.Item_Name__c = dupItems.Item_Name__c + ' * Duplicate Item';
            }
        }
    }
    
    // Method to be called before deleting Stock_Item__c records
    public static void onBeforeDelete(List<Stock_Item__c> deletedStockItems) {
        List<Case> insertCase = new List<Case>(); // List to hold cases to be inserted
        String stockOnHand; // Variable to hold stock on hand as a string
        
        // Loop through items to be deleted
        for (Stock_Item__c deletedItem : deletedStockItems) {
            if (deletedItem.Stock_on_Hand__c != 0) {
                // Convert stock on hand to a string
                stockOnHand = deletedItem.Stock_on_Hand__c.toPlainString();
                
                // Create a new case for each item with stock on hand
                Case c = new Case();
                c.Status = 'New';
                c.Origin = 'Deleted Stock Item';
                c.Subject = 'Delete Stock Item: ' + deletedItem.Item_Name__c;
                c.Description = 'Delete Stock ID: ' + deletedItem.Id + 
                                ' Item Name: ' + deletedItem.Item_Name__c + 
                                ' Stock at hand when deleted: ' + deletedItem.Stock_on_Hand__c;
                insertCase.add(c); // Add the case to the list
            }
        }
        
        // Insert cases if there are any in the list
        if (insertCase.size() > 0) {
            Insert insertCase;
        }
    }
    
    // Method to get stock items with low stock levels
    public static List<Stock_Item__c> getLowStockItems() {
        // Query stock items where the stock is low
        List<Stock_Item__c> lowItems = [SELECT ID, 
                                        Item_Name__c, 
                                        Item_Stock_is_Low__c, 
                                        Minimum_Stock_Level__c, 
                                        Stock_on_Hand__c 
                                        FROM Stock_Item__c        
                                        WHERE Item_Stock_is_Low__c = TRUE];
        
        // Return the list so it can be used in other processes
        return lowItems;
    }  
}