package pr2;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class TemperatureMain implements TemperatureConstants {

   private static String predictionsFilename = PREDICTED_TEMP_FILENAME;
   private static String actualFilename = DAILY_TEMP_FILENAME;
   private static String dailyResultsFilename = DAILY_RESULTS_FILENAME;

   public static void main(String[] args) {
      Scanner scan;
      String line;
      TemperaturePredictionList tpList;
      String[] lines = new String[2];
      System.out.println("TemperatureMain written by S. Robbins.");
      try {
         scan = new Scanner(new FileInputStream(predictionsFilename));
      } catch (FileNotFoundException e) {
         System.out.println("Error reading " + predictionsFilename);
         return;
      }
      System.out.println(predictionsFilename);
      try {
         for (int i = 0; i < 2; i++) {
            lines[i] = scan.nextLine();
            System.out.println(lines[i]);
         }
      } catch (NoSuchElementException e) {
         System.out.println(predictionsFilename + " needs at least 2 lines");
         return;
      }
      tpList = new TemperaturePredictionList();
      while (scan.hasNextLine()) {
         line = scan.nextLine();
         tpList.addFromDescriptor(line);
      }
      try {
         scan = new Scanner(new FileInputStream(actualFilename));
      } catch (FileNotFoundException e) {
         System.out.println("Error reading " + actualFilename);
         return;
      }
      System.out.println(actualFilename);
      try {
         for (int i = 0; i < 2; i++)
            System.out.println(scan.nextLine());
         while (scan.hasNextLine()) {
            line = scan.nextLine();
            tpList.setActualTemperature(line);
         }
      } catch (NoSuchElementException e) {
         System.out.println(actualFilename + " needs at least 2 lines");
         return;
      }
      
      System.out.println("Predictions list follows:");
      tpList.print();
      
 // Part 5 code:
      tpList.qualityCheck();
      
 // Start of Part 4
      DailyTemperatureList tempList = new DailyTemperatureList();
      for (int i = 0; i < tpList.getSize(); i++)
         tempList.setFromTemperaturePrediction(tpList.get(i));

      System.out.println("\nTemperature list follows:");
      tempList.print();
      
// Start of Part 6
      PrintWriter out;
      try {
         out = new PrintWriter(new PrintWriter(dailyResultsFilename),true);
      } catch (FileNotFoundException e) {
         System.out.println("Cannot create file "+dailyResultsFilename);
         return;
      }
      for (int i=0;i<lines.length;i++)
         out.println(lines[i]);
      out.print(tempList.toString());
      out.close();
   }

}