using System;
using uqac_ia_sudoku_csp.Interfaces;
using uqac_ia_sudoku_csp.Solver;
using uqac_ia_sudoku_csp.Solver.Generators;
using uqac_ia_sudoku_csp.Solver.NextNumberChoosers;
using uqac_ia_sudoku_csp.Solver.NextValueChoosers;

namespace uqac_ia_sudoku_csp
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var generatorType = "-";
            if (args.Length > 0)
            {
                generatorType = args[0];
            }
            var valueChooser = "mrv";
            if (args.Length > 1)
            {
                valueChooser = args[1];
            }
            var numberChooser = "lcv";
            if (args.Length > 2)
            {
                numberChooser = args[2];
            }
            var emptyCharacters = "0 .";
            if (args.Length > 3)
            {
                emptyCharacters = args[3];
            }

            object data;
            IGenerator generator;
            var board = new Board("123456789");

            if (generatorType == "-")
            {
                generator = new StdInGenerator();
                data = emptyCharacters;
            }
            else if (generatorType == "0")
            {
                generator = new EmptyGenerator();
                data = null;
            }
            else
            {
                generator = new FileGenerator();
                data = new FileGeneratorDbo
                {
                    EmptyCharacters = emptyCharacters,
                    FilePath = generatorType
                };
            }
            generator.Generate(board, data);
            board.Print(Console.Out);

            INextCellChooser nextCellChooser = null;
            if (valueChooser == "mrv")
            {
                nextCellChooser = new MrvNextCellChooser();
            }
            else if (valueChooser == "dh")
            {
                nextCellChooser = new DhNextCellChooser();
            }
            else if (valueChooser == "basic")
            {
                nextCellChooser = new BasicNextCellChooser();
            }
            else
            {
                Console.Error.WriteLine("Invalid next value chooser");
                Environment.Exit(64);
            }

            INextNumberChooser nextNumberChooser = null;
            if (numberChooser == "basic")
            {
                nextNumberChooser = new BasicNextNumberChooser();
            }
            else if (numberChooser == "lcv")
            {
                nextNumberChooser = new LcvNextNumberChooser();
            }
            else
            {
                Console.Error.WriteLine("Invalid next number chooser");
                Environment.Exit(64);
            }

            var solver = new BacktrackSearch(nextCellChooser, nextNumberChooser);
            var resolved = solver.Resolve(board);

            if (resolved.Success)
            {
                Console.WriteLine("Resolved:");
                board.Print(Console.Out);
            }
            else
            {
                Console.WriteLine("Not resolved");
            }
            Console.WriteLine($"{resolved.TryCount} tries");
            Console.WriteLine($"{resolved.ConsistentTryCount} consistent tries");
            Console.WriteLine($"{resolved.Elapsed.TotalMilliseconds} ms");
        }
    }
}