using Content.Client.UserInterface.Controls;
using Content.Shared._NF.Power;
using Robust.Client.AutoGenerated;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.XAML;

namespace Content.Client._NF.Power;

/// <summary>
/// Interface control for items with adjustable power draw.
/// </summary>
/// <seealso cref="AdjustablePowerDrawBoundUserInterface"/>
[GenerateTypedNameReferences]
public sealed partial class AdjustablePowerDrawMenu : FancyWindow
{
    // Dependencies
    [Dependency] private readonly IEntityManager _entityManager = null!;

    // The entity that this UI is for.
    private EntityUid _entity;

    // True if there are unsaved changes that should be maintained.
    private bool _unsavedChanges;

    // Events for the BUI to subscribe to.
    public event Action<float>? OnSetLoad;
    public event Action<bool>? OnSetPowered;

    // Public state.
    public bool On;

    public AdjustablePowerDrawMenu()
    {
        RobustXamlLoader.Load(this);
        IoCManager.InjectDependencies(this);

        PowerDropDown.AddItem("W", 0);
        PowerDropDown.AddItem("kW", 1);
        PowerDropDown.AddItem("MW", 2);
        PowerDropDown.AddItem("GW", 3);

        PowerDropDown.OnItemSelected += x => PowerDropDown.SelectId(x.Id);
        PowerDropDown.OnItemSelected += _ => SetUnsavedChanges();
        Load.OnTextChanged += _ => SetUnsavedChanges();
        SubmitButton.OnPressed += _ => CheckAndInvokeLoad();
        TogglePowerButton.OnPressed += _ => SetPowered(!On);
        TogglePowerButton.OnPressed += _ => OnSetPowered?.Invoke(TogglePowerButton.Pressed);
    }

    public void SetEntity(EntityUid entity)
    {
        _entity = entity;

        this.SetInfoFromEntity(_entityManager, _entity);
    }

    public void Update(AdjustablePowerDrawBuiState msg)
    {
        SetPowered(msg.On);

        if (string.IsNullOrEmpty(msg.Text))
        {
            ArbitraryText.Text = "";
            ArbitraryText.Visible = false;
        }
        else
        {
            ArbitraryText.Text = msg.Text;
            ArbitraryText.Visible = true;
        }

        // Set power text to current value in proper units
        // unless user has pending changes
        if (!_unsavedChanges && msg.Load >= 0)
        {
            if (msg.Load >= 1_000_000_000)
            {
                Load.Text = $"{msg.Load / 1_000_000_000:G3}";
                PowerDropDown.TrySelect(3);
            }
            else if (msg.Load >= 1_000_000)
            {
                Load.Text = $"{msg.Load / 1_000_000:G3}";
                PowerDropDown.TrySelect(2);
            }
            else if (msg.Load >= 1_000)
            {
                Load.Text = $"{msg.Load / 1_000:G3}";
                PowerDropDown.TrySelect(1);
            }
            else
            {
                Load.Text = $"{msg.Load:G3}";
                PowerDropDown.TrySelect(0);
            }
        }
    }

    private void CheckAndInvokeLoad()
    {
        _unsavedChanges = false;
        UnsavedChanges.Visible = false;

        if (!float.TryParse(Load.Text, out var result))
            return;

        if (!float.IsFinite(result) || !float.IsPositive(result))
            return;

        if (PowerDropDown.SelectedId > 0)
            result *= MathF.Pow(1000.0f, PowerDropDown.SelectedId);

        OnSetLoad?.Invoke(result);
    }

    private void SetUnsavedChanges()
    {
        _unsavedChanges = true;
        UnsavedChanges.Visible = true;
    }

    public void SetPowered(bool on)
    {
        On = on;
        TogglePowerButton.Pressed = on;

        TogglePowerButton.Text = Loc.GetString(
            on ? "comp-gas-pump-ui-status-enabled" : "comp-gas-pump-ui-status-disabled");
    }
}