using System.Text;
using Cysharp.Threading.Tasks;
using PrimeTween;
using UnityEngine.UIElements;

namespace DanieleMarotta.RiversongCodeShowcase
{
    [UIView("onboarding-panel")]
    public class OnboardingPanelUIView : UIView
    {
        private VisualElement _messages;

        public override UniTask InitializeAsync(UIService uiService, VisualElement rootElement)
        {
            base.InitializeAsync(uiService, rootElement);

            _messages = rootElement.Q<VisualElement>(className: "onboarding-panel__messages");

            return UniTask.CompletedTask;
        }

        public bool IsShowingAnyMessage()
        {
            return _messages.childCount > 0;
        }

        public void ShowMessage(string message)
        {
            var element = UIService.TemplateLibrary.OnboardingPanel.Message.CloneTree();
            element.Q<Button>().RegisterCallbackOnce<ClickEvent>(_ => CloseCurrentMessage());

            _messages.Add(element);

            ShowMessageAsync(element, message).Forget();
        }

        private async UniTask ShowMessageAsync(VisualElement element, string message)
        {
            UIVisibilityAnimation.PlayShowTween(element).ToUniTask().Forget();
            await AnimateTextAsync(element, message);
            PlayReminderAnimationAsync(element).Forget();
        }

        private async UniTask AnimateTextAsync(VisualElement element, string message)
        {
            var label = element.Q<Label>(className: "onboarding-message__body");
            label.text = string.Empty;

            var visibleText = new StringBuilder(message.Length);

            for (var i = 0; i < message.Length; i++)
            {
                if (message[i] == '<')
                {
                    var tagEnd = message.IndexOf('>', i + 1);
                    if (tagEnd >= 0)
                    {
                        visibleText.Append(message, i, tagEnd - i + 1);
                        label.text = visibleText.ToString();
                        i = tagEnd;
                        continue;
                    }
                }

                visibleText.Append(message[i]);
                label.text = visibleText.ToString();
                await UniTask.WaitForSeconds(0.03f, true);
            }
        }

        private async UniTask PlayReminderAnimationAsync(VisualElement message)
        {
            while (message.panel != null)
            {
                await UniTask.WaitForSeconds(5, true);

                await Sequence.Create(useUnscaledTime: true)
                    .Chain(Tween.Custom(0, 3, 0.1f, value => message.style.translate = new Translate(value, 0), Ease.OutQuad))
                    .Chain(Tween.Custom(3, -2.5f, 0.14f, value => message.style.translate = new Translate(value, 0), Ease.InOutQuad))
                    .Chain(Tween.Custom(-2.5f, 1.5f, 0.12f, value => message.style.translate = new Translate(value, 0), Ease.InOutQuad))
                    .Chain(Tween.Custom(1.5f, 0, 0.1f, value => message.style.translate = new Translate(value, 0), Ease.OutQuad));
            }
        }

        public void CloseCurrentMessage()
        {
            if (_messages.childCount == 0) return;

            _messages[0].RemoveFromHierarchy();
        }
    }
}