import java.io.RandomAccessFile;
import java.io.IOException;

public class UsePartsDB{
	public static void main(String[] args) throws IOException{
		PartsDB pdb = null;
		pdb = new PartsDB("parts.db");
		if(pdb.numRecs()==0){
			// populate the database with records.
			pdb.append("1-9009-3323-4x", "Wiper Blade Micro Edge", 30, 2468);
			pdb.append("1-3233-44923-7j", "Parking Brake Cable", 5, 1439);
			pdb.append("2-3399-6693-2m", "Halogen Bulb H4 55/60W", 22,813);
			pdb.append("2-599-2029-6k", "Turbo Oil Line O-Ring", 26, 155);
			pdb.append("3-1299-3299-9u", "Air Pump Electric", 9, 20200);
		}
		dumpRecords(pdb);
		
		pdb.update(1, "1-3233-44923-7j", "Parking Brake Cable", 5, 1995);
		dumpRecords(pdb);
		
		pdb.close();
	}
	
	static void dumpRecords(PartsDB pdb) throws IOException{
		for(int i=0;i<pdb.numRecs();i++){
			PartsDB.Part part = pdb.select(i);
			System.out.print(format(part.getPartnum(), PartsDB.PART_NUM_LENGTH, true));
			System.out.print(" | ");
			System.out.print(format(part.getDesc(), PartsDB.DESC_LENGTH, true));
			System.out.print(" | ");
			System.out.print(format("" + part.getQuantity(), 10, false));
			System.out.print(" | ");
			String unitCostString = part.getUnitCost()/100 + "." + part.getUnitCost()%100/10 + part.getUnitCost()%10;
			System.out.println(format(unitCostString, 10, false));
		}
		System.out.println("Number of records = " + pdb.numRecs());
		System.out.println();
	}
	
	static String format(String value, int maxWidth, boolean leftAlign){
		StringBuffer sb = new StringBuffer();
		int len = value.length();
		if(len>maxWidth){
			len = maxWidth;
			value = value.substring(0, len);
		}
		if(leftAlign){
			sb.append(value);
			for(int i=0; i<maxWidth-len;i++){
				sb.append(" ");
			}
		}else{
			for(int i=0;i<maxWidth-len;i++){
				sb.append(" ");
			}
			sb.append(value);
		}
		return sb.toString();
	}
}