using Parser;
using System;
using System.IO;
using System.Linq;
using Repl;

namespace ConsoleDemo
{
    class Program
    {
        private static readonly string BaseDirectory;
        private const string BaseDirectoryMacOs = @"/Applications/MATLAB_R2017b.app/toolbox/matlab/";
        private const string BaseDirectoryWindows = @"D:\Program Files\MATLAB\R2018a\toolbox\matlab\";


        private static MParser CreateParser(ITextWindow window)
        {
            return new MParser(window);
        }

        static Program()
        {
            switch (Environment.OSVersion.Platform)
            {
                case PlatformID.MacOSX:
                case PlatformID.Unix:
                    BaseDirectory = BaseDirectoryMacOs;
                    break;
                default:
                    BaseDirectory = BaseDirectoryWindows;
                    break;
            }
        }
        
        private static void ParserDemo()
        {
            Console.WriteLine("Hello World!");
            var text = @"x = 'abc";
            var window = new TextWindowWithNull(text, "noname");
            var parser = CreateParser(window);
            var tree = parser.Parse();
            TreeRenderer.RenderTree(tree);
            if (tree.Diagnostics.Any())
            {
                foreach (var diagnostic in tree.Diagnostics)
                {
                    Console.WriteLine($"ERROR: {diagnostic.Message} at position {diagnostic.Span.Start}");
                }
            }
            Console.ReadKey();            
        }

        private static SyntaxTree GetTree(string fileName)
        {
            var text = File.ReadAllText(fileName);
            var window = new TextWindowWithNull(text, fileName);
            var parser = CreateParser(window);
            var tree = parser.Parse();
            return tree;
        }

        public static void SemanticsDemo()
        {
            var fileName = Path.Combine(
                BaseDirectory,
                "datatypes",
                "@table",
                "table.m");
            var tree = GetTree(fileName);
            var root = tree.Root;
            var childNodesAndTokens = root.GetChildNodesAndTokens();
            var node = childNodesAndTokens[0].AsNode();
            var classChildNodesAndTokens = node.GetChildNodesAndTokens();
            var c = Semantics.GetClass.FromTree(root, fileName);
            Console.WriteLine(c.Name);
            foreach (var m in c.Methods)
            {
                Console.WriteLine($"* Method {m.Name}");
                if (m.Description != "")
                {
                    Console.WriteLine($"* Description: {m.Description}");
                }
            }
        }

        public static void ContextDemo()
        {
            var context = new Semantics.Context();
            context.ScanPath(BaseDirectory);
        }

        public static void DumbPrinterDemo()
        {
            var context = new Semantics.Context();
            context.ScanPath(BaseDirectory);
            var fileName = Path.Combine(
                BaseDirectory,
                "specgraph",
                "heatmap.m");
            var tree = GetTree(fileName);
            var printer = new DumbWalker(context);
            printer.Visit(tree.Root);
        }

        public static void UsageDemo()
        {
            var context = new Semantics.Context();
            context.ScanPath(BaseDirectory);
            var fileName = Path.Combine(
                BaseDirectory,
                "specgraph",
                "heatmap.m");
            var tree = GetTree(fileName);
            var printer = new UsageGathering(context);
            printer.Visit(tree.Root);
        }

        public static void ReplDemo()
        {
            var repl = new MRepl();
            repl.Run();
        }

        public static void Main(string[] args)
        {
            ReplDemo();
            //ParserDemo();
            //SemanticsDemo();
            //ContextDemo();
            //DumbPrinterDemo();
            //UsageDemo();
        }
    }
}