using Microsoft.UI.Dispatching;
using RblxTool.Interop;
using RblxTool.Models;

namespace RblxTool.Services;

public sealed class AppState
{
    private static readonly Lazy<AppState> Instance = new(() => new AppState());

    private AppState()
    {
        Engine = RblxEngine.Open();
    }

    public static AppState Current => Instance.Value;

    public RblxEngine Engine { get; }

    public AccountSummary? Active { get; private set; }

    public event Action? AccountsChanged;

    public IReadOnlyList<AccountSummary> Accounts()
    {
        var accounts = Engine.Accounts();
        Active ??= accounts.FirstOrDefault();
        return accounts;
    }

    public void SetActive(AccountSummary account)
    {
        if (Engine.Select(account.Id))
        {
            Active = account;
            AccountsChanged?.Invoke();
        }
    }

    public void NotifyAccountsChanged()
    {
        Active = Engine.Accounts().FirstOrDefault(a => a.Id == Active?.Id) ?? Engine.Accounts().FirstOrDefault();
        AccountsChanged?.Invoke();
    }

    public JobRunner CreateRunner(DispatcherQueue dispatcher) => new(Engine, dispatcher);
}