using System;
using System.Reflection;
using Windows.Win32;
using Windows.Win32.Foundation;

namespace AMNet.Server;

internal static class Config
{
    internal const string IOSection = "aimeio";

    static Config()
    {
        GameId = ReadKey(IOSection, "gameId", 4);
        ServerName = ReadKey(IOSection, "serverName", 26, Environment.MachineName);
        
        PhysicalCardUseIDm = PInvoke.GetPrivateProfileInt(IOSection, "useAimeDBForPhysicalCards", 0, ConfigFilePath) > 0;
        EnableAimeTxt = PInvoke.GetPrivateProfileInt(IOSection, "enableKeyboardMode", 1, ConfigFilePath) > 0;
        AimeTxtPath = ReadKey("aime", "aimePath", PInvoke.MAX_PATH, @"DEVICE\aime.txt");
    }

    public static string GameId { get; }
    
    /// <summary>
    /// The server name to show on devices. Defaults to the computer name.
    /// </summary>
    public static string ServerName { get; }
    
    /// <summary>
    /// Whether physically scanned cards should have their IDm forwarded to the game instead of the access code.
    /// </summary>
    public static bool PhysicalCardUseIDm { get; }

    /// <summary>
    /// Whether holding the enter key should trigger a card scan using the code from the aime.txt file
    /// </summary>
    public static bool EnableAimeTxt { get; }
    
    /// <summary>
    /// Path to the aime.txt file. Defaults to .\DEVICE\aime.txt
    /// </summary>
    public static string AimeTxtPath { get; }

    public static Version ServerVersion { get; } = new(Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyFileVersionAttribute>()?.Version ?? "1.0");

    private static string ConfigFilePath { get; } = Environment.GetEnvironmentVariable("SEGATOOLS_CONFIG_PATH") ?? ".\\segatools.ini";

    internal static unsafe string ReadKey(string section, string key, uint maxLength, string @default = null)
    {
        // +1 for null terminator
        var buffer = stackalloc char[(int)maxLength + 1];
        var bufferStr = new PWSTR(buffer);

        PInvoke.GetPrivateProfileString(section, key, @default ?? string.Empty, bufferStr, maxLength + 1, ConfigFilePath);
        return bufferStr.ToString();
    }
}