/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package bank;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;


/**
 * A stock quote
 */
public class Statement implements Serializable {

    private String customerName;
    private String accountID;
    private long cashBalance;
    private List<StockHolding> stockHoldings;
    private List<String> transactions = new ArrayList<String>();
    
    public Statement(){
        if (this.stockHoldings == null){
            this.stockHoldings = new ArrayList<StockHolding>();
        }
    }
    
    public Statement(String customerName, String accountID, long cashBalance,  List<StockHolding> stockHoldings){
        this.customerName = customerName;
        this.accountID = accountID;
        this.cashBalance = cashBalance;
        this.stockHoldings = stockHoldings;
        
        if (this.accountID == null){
            this.accountID = UUID.randomUUID().toString();   
        }
        
        if (this.stockHoldings == null){
            this.stockHoldings = new ArrayList<StockHolding>();
        }
    }
    
    public String getCustomerName() {
        return customerName;
    }
    
    public String getAccountID() {
        return accountID;
    }
    
    public long getCashBalance() {
        return cashBalance;
    }
       
    public void creditCashBalance(long credit, String reason) {
        this.cashBalance += credit;
        transactions.add("credit " + credit + " : " + reason);
    }
    
    public void debitCashBalance(long debit, String reason) {
        this.cashBalance -= debit;
        transactions.add("debit " + debit + " : " + reason);
    }    
    
    public List<StockHolding> getStockHolding() {
        return stockHoldings;
    }
    
    public void creditStockHolding(StockHolding stock){
        stockHoldings.add(stock);
        debitCashBalance(stock.getPrice() * stock.getNumberHeld(), 
                         "bought " + stock.getNumberHeld() + " of " + stock.getStockCode() + " at " + stock.getPrice());
    }
    
    public void debitStockHolding(StockHolding stock){
        int numberToSell = stock.getNumberHeld();
        int numberSold = 0;
        List<StockHolding> toRemove = new ArrayList<StockHolding>();
        
        for (StockHolding stockHolding : stockHoldings){
            if (stockHolding.getStockCode().equals(stock.getStockCode())){
                if (stockHolding.getNumberHeld() > numberToSell){
                    stockHolding.setNumberHeld(stockHolding.getNumberHeld() - numberToSell);
                    numberSold += numberToSell;
                    numberToSell = 0;
                    break;
                } else {
                    numberSold += stockHolding.getNumberHeld();
                    numberToSell -= stockHolding.getNumberHeld();
                    stockHolding.setNumberHeld(0);
                    toRemove.add(stockHolding);
                }
            }
        }
        
        stockHoldings.removeAll(toRemove);
        
        creditCashBalance(stock.getPrice() * numberSold, 
                "sold " + numberSold + " of " + stock.getStockCode() + " at " + stock.getPrice());
    }
    
    public List<String> getTransactions() {
        return transactions;
    }
    
    @Override
    public String toString() {
        String returnString = 
               "customer name = " + customerName +
             "\naccount Id    = " + accountID +
             "\nbalance       = " + cashBalance + 
             "\nequities      = \n";
        
        for (StockHolding stock : stockHoldings){
            returnString += "  stock " + stock.getStockCode() + " number held = " + stock.getNumberHeld() + "\n";
        }
        
        returnString +=
             "transactions  = \n";
        
        for(String transaction : transactions){
            returnString += "  " + transaction + "\n";
        }
        
        return returnString;
    }
}