#nullable enable

using System.Globalization;
using System.Linq;
using Godot;
using SideScrollerGame.Hero.Rules;

namespace SideScrollerGame.Hero;

public partial class HeroStateHudController : Control
{
    public override void _Ready()
    {
        EnsureLabel();
        Refresh();
    }

    public void Bind(HeroRuntimeService runtime)
    {
        if (m_Runtime is not null)
        {
            m_Runtime.StateChanged -= HandleStateChanged;
        }

        m_Runtime = runtime;
        runtime.StateChanged += HandleStateChanged;
        Refresh();
    }

    public void Refresh()
    {
        Label label = EnsureLabel();
        if (m_Runtime is null)
        {
            label.Text = "Hero: unbound";
            return;
        }

        HeroRunState state = m_Runtime.State;
        string slots = string.Join(", ", state.PrimaryWeaponSlots.Select((weaponId, index) => index == state.SelectedPrimaryWeaponSlotIndex ? $"[{Display(weaponId)}]" : Display(weaponId)));
        string nextThreshold = m_Runtime.NextPointThreshold?.ToString(CultureInfo.InvariantCulture) ?? "max";
        label.Text = $"Hero: {state.LifeState}\n" + $"Level: {state.Level}  Points: {state.Points}  Next: {nextThreshold}\n" + $"Shields: {state.ShieldCharges}  Retries: {state.RetryCount}\n" + $"Primary: {slots}\n" + $"Secondary: {Display(state.CurrentSecondaryWeaponId)}\n" + $"Special: {Display(state.CurrentSpecialWeaponId)} ammo={state.SpecialAmmo}\n" + $"Squadron: {Display(state.SquadronMateTypeId)} x{state.SquadronMateCount}\n" + $"Last: {state.LastStateChange}";
    }

    private void HandleStateChanged(HeroRunState state)
    {
        Refresh();
    }

    private Label EnsureLabel()
    {
        if (m_StateLabel is not null)
        {
            return m_StateLabel;
        }

        m_StateLabel = GetNodeOrNull<Label>("StateLabel");
        if (m_StateLabel is null)
        {
            m_StateLabel = new Label { Name = "StateLabel" };
            AddChild(m_StateLabel);
        }

        m_StateLabel.AutowrapMode = TextServer.AutowrapMode.WordSmart;
        return m_StateLabel;
    }

    private static string Display(string? value)
    {
        return string.IsNullOrWhiteSpace(value) ? "empty" : value;
    }

    private HeroRuntimeService? m_Runtime;
    private Label? m_StateLabel;
}