using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using DTLib.Demystifier;
using DTLib.Console;
using DTLib.Extensions;
using File = DTLib.Filesystem.File;

namespace ParadoxDlcMetadataParser;

static class Program
{
    private static string? GameName;
    
    public static void Main(string[] args)
    {
        try
        {
            new LaunchArgumentParser(
                new LaunchArgument(
                    new[] { "f", "file" },
                    "Searches for dlc id and name declarations in a dlc_metadata/* file.",
                    ParseFile,
                    "file_name",
                    priority: 99),
                new LaunchArgument(
                    new[] { "g", "game" },
                    "Sets game name.",
                    name => GameName = name,
                    "game_name")
            ).ParseAndHandle(args);
        }
        catch (LaunchArgumentParser.ExitAfterHelpException)
        {
            // this exception is thrown when the program exits after showing help message
        }
        catch (Exception ex)
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine(ex.ToStringDemystified());
        }
        Console.ResetColor();
    }

    static void ParseFile(string filePath)
    {
        using var file = File.OpenRead(filePath);
        using var r = new StreamReader(file);
        List<string> names = new();
        List<int> ids = new();
        while (!r.EndOfStream)
        {
            string line = r.ReadLine()!;
            if (IsVarDeclaration(line, "name"))
                names.Add(line.AsSpan().After('=').After('"').Before('"').Trim().Trim('\t').ToString());
            else if (IsVarDeclaration(line, "id") || IsVarDeclaration(line, "steam_id"))
            {
                var s1 = line.AsSpan().After('=');
                if(s1.Contains('#'))
                    s1 = s1.After("#"); // some ids are hidden in comments
                ids.Add(Convert.ToInt32(s1.Trim().Trim('\t').Trim('"').Trim(' ').ToString()));
            }
        }

        if (names.Count != ids.Count)
            throw new Exception("names.Count != ids.Count");
		
		var ids_and_names = ids.Zip(names)
            .DistinctBy(tuple => tuple.First)
            .OrderBy(tuple => tuple.First)
            .ToList<(int id, string name)>();
        
        Console.WriteLine("----------------------------------");
        foreach ((int id, string name) in ids_and_names)
        {
            Console.WriteLine($"{id} = {GameName}: {name}");
        }
        Console.WriteLine("----------------------------------");
        Console.WriteLine($"{ids_and_names.Count} DLC declarations found");
    }

    static bool IsVarDeclaration(string line, string varName) =>
        line.StartsWith($"{varName} =") ||
        line.StartsWith($"{varName}=") ||
        line.Contains($" {varName} =") ||
        line.Contains($" {varName}=") ||
        line.Contains($"\t{varName} =") ||
        line.Contains($"\t{varName}=");
}