using System.Text.Json;
using ParadoxSaveParser.Lib;

namespace ParadoxSaveParser.CLI;

internal enum Mode
{
    Unset, Search, Interactive
}

internal static class Modes
{
    internal static void Search(string searchQuery, IOPath inputPath, IOPath? outputPath)
    {
        using var inputStream = File.OpenRead(inputPath);
        
        using var outputStream = outputPath is null
            ? Console.OpenStandardOutput()
            : File.OpenWrite(outputPath.Value);
        
        var searchExpression = SearchExpressionCompiler.Compile(searchQuery);
        
        var parser = new SaveParserEU4(inputStream, searchExpression);
        var parsedValue = parser.Parse();
        JsonSerializer.Serialize(outputStream, parsedValue, ParsedValueJsonContext.Default.DictionaryStringListObject);
    }
    
    internal static void Interactive()
    {
        Console.Clear();
        Console.ResetColor();
        ColoredConsole.WriteTitle("interactive mode", fg: ConsoleColor.Cyan);
        ColoredConsole.WriteLine($"working directory: '{Environment.CurrentDirectory}'", ConsoleColor.Gray);
        IOPath? inputPath = null;
        IOPath? outputPath = null;
        
        while (true)
        {
            try
            {
                ColoredConsole.Write("> ", ConsoleColor.Blue);
                Console.ForegroundColor = ConsoleColor.Gray;
                string? input = Console.ReadLine();
                if (string.IsNullOrEmpty(input))
                    continue;

                const string helpMessage =
                    """
                    Commands dont have arguments. Just write command name ant it will ask you for more information.
                    Avaliable commands:
                        h, help - show this message
                        q, quit, exit - close the program
                        pwd - show working directory
                        cd - change working directory
                        ls - show list of files in working directory
                        i, input - set input file path
                        o, output - set output file path
                        s, search - perform search in input file using expression 
                    """;

                if (input.Contains(' '))
                {
                    ColoredConsole.WriteLine("Commands dont have arguments." 
                                             + " Just write command name ant it will ask you for more information.", 
                        ConsoleColor.Red);
                    continue;
                }
                
                switch (input)
                {
                    default:
                        ColoredConsole.WriteLine("Unknown command, use 'help' for a list of commands.",
                            ConsoleColor.Red);
                        continue;

                    case "q":
                    case "quit":
                    case "exit":
                        return;

                    case "h":
                    case "help":
                        ColoredConsole.WriteLine(helpMessage, fg: ConsoleColor.White);
                        break;

                    case "i":
                    case "input":
                        input = ColoredConsole.ReadLine("Input file path",
                            ConsoleColor.Blue);
                        if (string.IsNullOrEmpty(input))
                            throw new NullReferenceException();
                        inputPath = input;
                        break;

                    case "o":
                    case "output":
                        input = ColoredConsole.ReadLine("Output file path [default=stdout]",
                            ConsoleColor.Blue);
                        if (string.IsNullOrEmpty(input))
                            throw new ArgumentException("Input file path is required");
                        inputPath = input;
                        break;

                    case "s":
                    case "search":
                        if (inputPath is null)
                            throw new ArgumentException("Input file path is required");

                        var searchQuery = ColoredConsole.ReadLine("search expression",
                            ConsoleColor.Blue);
                        if (string.IsNullOrEmpty(searchQuery))
                            throw new ArgumentException("Search expression is required");

                        ColoredConsole.WriteHLine('-', ConsoleColor.Cyan);
                        Console.ResetColor();
                        Search(searchQuery, inputPath.Value, outputPath);
                        ColoredConsole.WriteHLine('-', ConsoleColor.Green);
                        break;

                    case "pwd":
                        ColoredConsole.WriteLine(Environment.CurrentDirectory, ConsoleColor.White);
                        break;

                    case "cd":
                        input = ColoredConsole.ReadLine("Change working directory to",
                            ConsoleColor.Blue);
                        if (!string.IsNullOrEmpty(input))
                        {
                            Environment.CurrentDirectory = new IOPath(input).Str;
                            ColoredConsole.WriteLine(Environment.CurrentDirectory, ConsoleColor.Green);
                        }

                        break;

                    case "ls":
                        IOPath curdir = Directory.GetCurrent();
                        foreach (var dir in Directory.GetDirectories(curdir))
                        {
                            ColoredConsole.WriteLine(dir.RemoveBase(curdir).Str + Path.Sep, ConsoleColor.Cyan);
                        }

                        foreach (var file in Directory.GetFiles(curdir))
                        {
                            ColoredConsole.WriteLine(file.RemoveBase(curdir).Str, ConsoleColor.White);
                        }

                        break;
                }
            }
            catch (Exception ex)
            {
                ColoredConsole.WriteLine(ex.ToStringDemystified(), ConsoleColor.Red);
            }
        }
    }
}