using System.Diagnostics;

using Toak.Core;

namespace Toak.IO;

public static class TextInjector
{
    public static void Inject(string text, string backend)
    {
        Logger.LogDebug($"Injecting text: '{text}' with {backend}");
        if (string.IsNullOrWhiteSpace(text)) return;

        try
        {
            ProcessStartInfo pInfo;
            if (backend.ToLowerInvariant() == "wtype")
            {
                Logger.LogDebug($"Injecting text using wtype...");
                pInfo = new ProcessStartInfo
                {
                    FileName = "wtype",
                    Arguments = $"\"{text.Replace("\"", "\\\"")}\"",
                    UseShellExecute = false,
                    CreateNoWindow = true
                };
            }
            else // xdotool
            {
                Logger.LogDebug($"Injecting text using xdotool...");
                pInfo = new ProcessStartInfo
                {
                    FileName = "xdotool",
                    Arguments = $"type --clearmodifiers --delay 0 \"{text.Replace("\"", "\\\"")}\"",
                    UseShellExecute = false,
                    CreateNoWindow = true
                };
            }
            var process = Process.Start(pInfo);
            process?.WaitForExit();
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[TextInjector] Error injecting text: {ex.Message}");
            Notifications.Notify("Injection Error", "Could not type text into window.");
        }
    }

    public static async Task<string> InjectStreamAsync(IAsyncEnumerable<string> tokenStream, string backend)
    {
        string fullText = string.Empty;
        try
        {
            ProcessStartInfo pInfo;
            if (backend.ToLowerInvariant() == "wtype")
            {
                Logger.LogDebug($"Setting up stream injection using wtype...");
                pInfo = new ProcessStartInfo
                {
                    FileName = "wtype",
                    Arguments = "-",
                    UseShellExecute = false,
                    CreateNoWindow = true,
                    RedirectStandardInput = true
                };
            }
            else // xdotool
            {
                Logger.LogDebug($"Setting up stream injection using xdotool...");
                pInfo = new ProcessStartInfo
                {
                    FileName = "xdotool",
                    Arguments = "type --clearmodifiers --delay 0 --file -",
                    UseShellExecute = false,
                    CreateNoWindow = true,
                    RedirectStandardInput = true
                };
            }

            using var process = Process.Start(pInfo);
            if (process == null) return string.Empty;

            Logger.LogDebug("Started stream injection process, waiting for tokens...");

            await foreach (var token in tokenStream)
            {
                Logger.LogDebug($"Injecting token: '{token}'");
                fullText += token;
                await process.StandardInput.WriteAsync(token);
                await process.StandardInput.FlushAsync();
            }

            Logger.LogDebug("Stream injection complete. Closing standard input.");
            process.StandardInput.Close();
            await process.WaitForExitAsync();
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[TextInjector] Error injecting text stream: {ex.Message}");
            Notifications.Notify("Injection Error", "Could not type text stream into window.");
        }
        return fullText;
    }
}