package jcgp.backend.parsers;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;

import jcgp.backend.modules.problem.TestCaseProblem;
import jcgp.backend.resources.ModifiableResources;

public abstract class TestCaseParser {
	
	public static void parse(File file, TestCaseProblem<?> problem, ModifiableResources resources) {
		FileReader fr;
		try {
			fr = new FileReader(file);
		} catch (FileNotFoundException e) {
			resources.println("[Parser] Error: could not find " + file.getAbsolutePath() + ".");
			return;
		}
		resources.println("[Parser] Parsing file: " + file.getAbsolutePath() + "...");
		Scanner in = new Scanner(fr);
		boolean readingTestCases = false;
		int inputs = 0, outputs = 0;
		int cases = 0;
		
		problem.clearTestCases();
		
		while (in.hasNextLine()) {
			String nextLine = in.nextLine();
			
			if (nextLine.startsWith(".i")) {
				String[] split = nextLine.split(" +");
				inputs = Integer.parseInt(split[1]);
			} else if (nextLine.startsWith(".o")) {
				String[] split = nextLine.split(" +");
				outputs = Integer.parseInt(split[1]);
			} else if (nextLine.startsWith(".p") || nextLine.startsWith(".t")) {
				readingTestCases = true;
			} else if (nextLine.startsWith(".e")) {
				readingTestCases = false;
			} else if (readingTestCases) {
				String[] split = nextLine.split("( |\t)+");
				String[] inputCases = new String[inputs];
				String[] outputCases = new String[outputs];
				for (int i = 0; i < inputs; i++) {
					inputCases[i] = split[i];
				}
				for (int o = 0; o < outputs; o++) {
					outputCases[o] = split[o + inputs];
				}
				
				problem.addTestCase(inputCases, outputCases);
				cases++;
			}
		}
		resources.println("[Parser] Finished, added " + cases + " test cases.");
		in.close();
	}

	public static void parseParameters(File file, ModifiableResources resources) {
		
		FileReader fr;
		try {
			fr = new FileReader(file);
		} catch (FileNotFoundException e) {
			resources.println("[Parser] Error: could not find " + file.getAbsolutePath() + ".");
			return;
		}
		
		resources.println("[Parser] Parsing parameters...");
		Scanner in = new Scanner(fr);

		while (in.hasNextLine()) {
			String nextLine = in.nextLine();
			if (nextLine.startsWith(".i")) {
				String[] split = nextLine.split(" +");
				resources.setInputs(Integer.parseInt(split[1]));
				resources.println("[Parser] Number of inputs set to " + resources.inputs());
			} else if (nextLine.startsWith(".o")) {
				String[] split = nextLine.split(" +");
				resources.setOutputs(Integer.parseInt(split[1]));
				resources.println("[Parser] Number of outputs set to " + resources.outputs());
			}
		}
		in.close();
		
		resources.println("[Parser] Finished parsing parameters.");
	}
}