package client;

import java.io.File;
import java.util.ArrayList;
import java.util.Scanner;

import datamodel.IResult;
import datamodel.MeasurementRecord;
import mainengine.IMainEngine;
import mainengine.MainEngineFactory;

public class Client {

	private static Scanner scanner;

	private static IMainEngine mainEngine;
	private static MainEngineFactory factory;
	private static ArrayList<MeasurementRecord> objCollection;
	private static IResult result;
	static private String inputFilename;
	static private String outputFilename;
	static private String delimeter;
	static private Boolean hasHeader;
	static private int numFields;

	private static String description;

	private static ArrayList<String> history = new ArrayList<String>();

	public static void main(String[] args) {

		scanner = new Scanner(System.in);

		factory = new MainEngineFactory();
		mainEngine = factory.createMainEngine("MainEngine");
		objCollection = new ArrayList<MeasurementRecord>();

		String input;
		do {
			System.out.println("LOAD <file path>");
			System.out.println("BUILD <aggregator type> <aggregator function>");
			System.out.println("REPORT <type> <file path>");
			System.out.println("HISTORY");
			System.out.println("EXIT");

			System.out.print("Select option: ");
			input = scanner.nextLine();

			if (input.toLowerCase().startsWith("load")) {
				if (input.contains(" ")) {
					inputFilename = input.replace(input.split(" ")[0]+" ", "");

					File file = new File(inputFilename);

					if (file.exists()) {
						System.out.print("Enter delimeter: ");
						delimeter = scanner.nextLine();

						System.out.print("Does file contain header line (true/false): ");
						hasHeader = scanner.nextBoolean();

						System.out.print("Fields number: ");
						numFields = scanner.nextInt();
						scanner.nextLine();

						mainEngine.loadData(inputFilename, delimeter, hasHeader, numFields, objCollection);
					} else {
						System.out.println("File doesnt exist");
					}
				} else {
					System.out.println("Missing input. Please enter path to load file");
				}
			} else if (input.toLowerCase().startsWith("build")) {
				if (input.contains(" ")) {

					String aggregatorType = input.split(" ")[1].toLowerCase();
					String aggregatorFunc = input.split(" ")[2].toLowerCase();

					if ((aggregatorType.equals("season") || aggregatorType.equals("month") || aggregatorType.equals("dayofweek") || aggregatorType.equals("period"))) {
						if ((aggregatorFunc.equals("avg") || aggregatorFunc.equals("sum"))) {
							System.out.print("Enter description: ");
							description = scanner.nextLine();
							result = mainEngine.aggregateByTimeUnit(objCollection, aggregatorType, aggregatorFunc, description);
						} else {
							System.out.println("Invalid input. Aggregator function should be avg or sum.");
						}
					} else {
						System.out.println("Invalid input. Aggregator type should be season, month, dayofweek or period.");
					}
				} else {
					System.out.println("Missing input. Please enter required fields");
				}
			} else if (input.toLowerCase().startsWith("report")) {
				if (input.contains(" ")) {
					String type = input.split(" ")[1].toLowerCase();
					if ((type.equals("md") || type.equals("txt") || type.equals("html"))) {
						outputFilename = input.replace(input.split(" ")[0]+" "+input.split(" ")[1]+" ", "");
						mainEngine.reportResultInFile(result, type, outputFilename);

						history.add(description+", "+outputFilename);
					} else {
						System.out.println("Invalid input. Please use md, html or txt for report type.");
					}
				} else {
					System.out.println("Missing input. Please enter required fields");
				}
			} else if (input.toLowerCase().equals("history")) {
				if (history.size()==0) {
					System.out.println("Histroy is empty");
				} else {
					for (String str : history) {
						System.out.println(str);
					}

					System.out.println("\nPress enter to continue...");
					scanner.nextLine();
				}
			} else if (input.toLowerCase().equals("exit")) {
				System.out.println("Exiting application.");
			} else if (!input.toLowerCase().equals("")) {
				System.out.println("Invalid command.");
			}

			System.out.println("\n");
		}
		while (!input.toLowerCase().equals("exit"));

		System.exit(0);
	}
}