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improve transaction handling

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buzz-lightsnack-2007 2024-02-27 01:20:39 +08:00
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src/main/java/tech/iBeans/POSware/Lite/transact.java Normal file
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/*
* Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
* Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
*/
package tech.iBeans.POSware.Lite;
// Import local modules.
import tech.iBeans.POSware.Lite.inventory.*;
// Import global modules.
import java.util.*;
/**
*
* @author eleven
*/
public class transact {
public static Dictionary<String, Dictionary> items = new Hashtable<>();
public static Dictionary<String, Double> price = new Hashtable<>();
/*
{item: {
qty:
price: {
"tax":
"subtotal":
"total":
"discount":
}
}
}
*/
public static void init() {
/* Initialize the variables, setting them with default values.
*/
items = new Hashtable<>();
price = new Hashtable<>();
// Set default values for prices.
price.put("total", 0.00);
price.put("tax", 0.00);
price.put("subtotal", 0.00);
price.put("discount", 0.00);
};
public static Dictionary calculate() {
/* Calculate the subtotal, total, and VAT.
Returns: (Dictionary) the contents of the price variable
*/
// Prepare to enumerate each item.
Enumeration<String> items_list = items.keys();
// Set default values for prices.
price.put("total", 0.00);
price.put("subtotal", 0.00);
price.put("discount", 0.00);
price.put("tax", 0.00);
while (items_list.hasMoreElements()) {
String item = items_list.nextElement();
if (((Dictionary) items.get(item).get("price")).get("tax") != null) {
price.put("tax", (double) price.get("tax") + (double) ((Dictionary) items.get(item).get("price")).get("tax"));
};
if (((Dictionary) items.get(item).get("price")).get("subtotal") != null) {
price.put("subtotal", (double) price.get("subtotal") + (double) ((Dictionary) items.get(item).get("price")).get("subtotal"));
};
if (((Dictionary) items.get(item).get("price")).get("total") != null) {
price.put("total", (double) price.get("total") + (double) ((Dictionary) items.get(item).get("price")).get("total"));
};
if (((Dictionary) items.get(item).get("price")).get("discount") != null) {
price.put("discount", (double) price.get("discount") + (double) ((Dictionary) items.get(item).get("price")).get("discount"));
};
};
if (price.get("tip") != null) {
if (Double.parseDouble(price.get("tip").toString()) >= 0) {
price.put("total", (double) price.get("total") + (double) price.get("tip"));
};
};
// Return the dictionary.
return(price);
};
public static Dictionary<String, Double> calculate(String SKU, int QUANTITY) {
inventory.refresh();
Dictionary item_details = inventory.items.get(SKU);
// Create an output dictionary.
Dictionary<String, Double> item_pricing = new Hashtable<>();
// Fill in with default data, especially useful when the product is not found.
item_pricing.put("subtotal", 0.0);
item_pricing.put("total", 0.0);
if (item_details != null) {
if (item_details.get("Price") != null) {
item_pricing.put("subtotal", Double.valueOf(item_details.get("Price").toString()) * QUANTITY);
item_pricing.put("total", Double.valueOf( item_pricing.get("subtotal")));
if (item_details.get("Tax") != null) {
item_pricing.put("tax", Double.valueOf(item_details.get("Tax").toString()) * QUANTITY);
item_pricing.put("total", Double.valueOf(item_pricing.get("total").toString()) + Double.valueOf(item_pricing.get("tax").toString()));
};
if (item_details.get("Discount") != null) {
if (Integer.parseInt(item_details.get("Discount").toString()) > 0) {
item_pricing.put("discount",
QUANTITY * Double.parseDouble(item_details.get("Price").toString()) * (1 - (Double.parseDouble(item_details.get("Discount").toString()) / 100))
);
} else if (Integer.parseInt(item_details.get("Discount").toString()) < 0) {
item_pricing.put("discount",
QUANTITY * Double.parseDouble(item_details.get("Price").toString()) * (0 - (Double.parseDouble(item_details.get("Discount").toString()) / 100))
);
} else {
item_pricing.put("discount", (double) 0);
};
item_pricing.put("total", Double.valueOf(item_pricing.get("total").toString()) - Double.valueOf(item_pricing.get("discount").toString()));
};
};
};
// Return the data.
return item_pricing;
};
public static boolean add(String SKU, int QUANTITY) {
/* Add an item to the shopping cart.
Parameters:
SKU (String): the SKU of the item
QUANTITY (int): the quantity
Returns: (boolean) the calculation state
*/
if (QUANTITY == 0) {return(false);}
else if (QUANTITY < 0) {return(remove(SKU, QUANTITY));};
// containing the current data's information
Dictionary ITEM_CURRENT_DATA = items.get(SKU);
// check if the item exists
if (ITEM_CURRENT_DATA != null) {
ITEM_CURRENT_DATA.put("qty", ((int) ITEM_CURRENT_DATA.get("qty")) + QUANTITY);
} else {
// Initialize the dictionary.
ITEM_CURRENT_DATA = new Hashtable<>();
// Add the quantity.
ITEM_CURRENT_DATA.put("qty", QUANTITY);
};
// Calculate these items' price.
ITEM_CURRENT_DATA.put("price", calculate(SKU, ((int) ITEM_CURRENT_DATA.get("qty"))));
// Add to the shopping cart's items.
items.put(SKU, ITEM_CURRENT_DATA);
// Calculate all prices.
calculate();
// Return the success state.
return((items.get(SKU) != null));
};
public static boolean remove(String SKU, int QUANTITY) {
/* Remove an item to the shopping items.
Parameters:
SKU (String): the SKU of the item
QUANTITY (int): the quantity
Returns: (boolean) the removal state
*/
if (QUANTITY == 0) {return(false);}
else if (QUANTITY < 0) {return(add(SKU, QUANTITY));};
// containing the current data's information
Dictionary ITEM_CURRENT_DATA = items.get(SKU);
// check if the item exists. There's no need to remove an item that's already been removed.
if (ITEM_CURRENT_DATA != null) {
if (QUANTITY >= (int) ITEM_CURRENT_DATA.get("qty")) {
items.remove(SKU);
} else {
ITEM_CURRENT_DATA.put("qty", ((int) ITEM_CURRENT_DATA.get("qty")) - QUANTITY);
ITEM_CURRENT_DATA.put("price", calculate(SKU, ((int) ITEM_CURRENT_DATA.get("qty"))));
// Add to the shopping cart's items.
items.put(SKU, ITEM_CURRENT_DATA);
};
};
// Calculate all prices.
calculate();
// Return the state.
return(true);
};
}