using WirelessTextSyncer.Windows.Models;

namespace WirelessTextSyncer.Windows.Services;

public sealed class SyncMessageHandler
{
    private readonly IKeyboardInjectionService keyboard;
    private string remoteText = string.Empty;

    public SyncMessageHandler(IKeyboardInjectionService keyboard)
    {
        this.keyboard = keyboard;
    }

    public void Handle(SyncMessage message)
    {
        switch (message.Action)
        {
            case SyncAction.InsertText:
                var insertedText = message.Text ?? string.Empty;
                keyboard.InsertText(insertedText);
                remoteText += insertedText;
                break;
            case SyncAction.ReplaceAll:
                ReplaceAll(message.Text ?? string.Empty);
                break;
            case SyncAction.Backspace:
                keyboard.Backspace();
                if (remoteText.Length > 0)
                {
                    remoteText = remoteText[..^1];
                }

                break;
            case SyncAction.Enter:
                keyboard.Enter();
                remoteText += Environment.NewLine;
                break;
            case SyncAction.Ping:
                break;
            default:
                throw new InvalidOperationException($"Unsupported sync action: {message.Action}");
        }
    }

    private void ReplaceAll(string newText)
    {
        if (newText == remoteText)
        {
            return;
        }

        AppLogger.Info(
            $"Hard replacing focused text. Old mirrored length: {remoteText.Length}, new length: {newText.Length}");

        keyboard.ReplaceFocusedText(newText);
        remoteText = newText;
    }
}