#nullable enable

using System.Collections;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace ReplacedPerson.Runtime
{
    [DisallowMultipleComponent]
    public sealed class ReplacedBattlePhaseMotion : MonoBehaviour
    {
        private RectTransform? _panel;
        private CanvasGroup? _group;
        private Image? _background;
        private Image? _accent;
        private TMP_Text? _title;
        private TMP_Text? _detail;

        public bool IsVisible => _panel != null && _panel.gameObject.activeSelf;
        public string CurrentTitle => _title?.text ?? string.Empty;

        private void Awake()
        {
            CreateOverlay();
            SetVisible(false);
        }

        public IEnumerator PlayStage(string title, string detail, Color accent, float holdSeconds = .68f)
        {
            if (!Prepare(title, detail, accent)) yield break;
            yield return FadeIn();
            yield return new WaitForSecondsRealtime(holdSeconds);
            yield return FadeOut();
        }

        public IEnumerator PlayDie(string title, int finalFace, string result, Color accent)
        {
            if (!Prepare(title, "D6  ·", accent)) yield break;
            yield return FadeIn();
            for (var frame = 0; frame < 8; frame++)
            {
                if (_detail != null) _detail.text = "D6  " + ((frame * 5 + 2) % 6 + 1);
                if (_panel != null) _panel.localRotation = Quaternion.Euler(0, 0, frame % 2 == 0 ? -1.2f : 1.2f);
                yield return new WaitForSecondsRealtime(.065f);
            }
            if (_panel != null) _panel.localRotation = Quaternion.identity;
            if (_detail != null) _detail.text = $"D6  {finalFace}\n{result}";
            yield return new WaitForSecondsRealtime(.75f);
            yield return FadeOut();
        }

        private bool Prepare(string title, string detail, Color accent)
        {
            if (_panel == null || _group == null || _background == null || _accent == null || _title == null || _detail == null)
                return false;
            _title.text = title;
            _detail.text = detail;
            _accent.color = accent;
            _background.color = new Color(.035f, .041f, .043f, .96f);
            _panel.localScale = Vector3.one * .92f;
            _panel.localRotation = Quaternion.identity;
            _group.alpha = 0f;
            SetVisible(true);
            _panel.SetAsLastSibling();
            return true;
        }

        private IEnumerator FadeIn()
        {
            if (_panel == null || _group == null) yield break;
            var elapsed = 0f;
            const float duration = .16f;
            while (elapsed < duration)
            {
                elapsed += Time.unscaledDeltaTime;
                var t = 1f - Mathf.Pow(1f - Mathf.Clamp01(elapsed / duration), 3f);
                _group.alpha = t;
                _panel.localScale = Vector3.one * Mathf.Lerp(.92f, 1f, t);
                yield return null;
            }
            _group.alpha = 1f;
            _panel.localScale = Vector3.one;
        }

        private IEnumerator FadeOut()
        {
            if (_panel == null || _group == null) yield break;
            var elapsed = 0f;
            const float duration = .16f;
            while (elapsed < duration)
            {
                elapsed += Time.unscaledDeltaTime;
                var t = Mathf.Clamp01(elapsed / duration);
                _group.alpha = 1f - t;
                _panel.localScale = Vector3.one * Mathf.Lerp(1f, .97f, t);
                yield return null;
            }
            SetVisible(false);
        }

        private void CreateOverlay()
        {
            var panelObject = new GameObject("ResolutionPhaseOverlay", typeof(RectTransform), typeof(CanvasRenderer), typeof(Image), typeof(CanvasGroup));
            _panel = panelObject.GetComponent<RectTransform>();
            _panel.SetParent(transform, false);
            _panel.anchorMin = new Vector2(.25f, .37f);
            _panel.anchorMax = new Vector2(.75f, .64f);
            _panel.offsetMin = Vector2.zero;
            _panel.offsetMax = Vector2.zero;
            _background = panelObject.GetComponent<Image>();
            _background.raycastTarget = false;
            _group = panelObject.GetComponent<CanvasGroup>();
            _group.blocksRaycasts = false;
            _group.interactable = false;

            var accentObject = new GameObject("Accent", typeof(RectTransform), typeof(CanvasRenderer), typeof(Image));
            var accentRect = accentObject.GetComponent<RectTransform>();
            accentRect.SetParent(_panel, false);
            accentRect.anchorMin = new Vector2(0, 0);
            accentRect.anchorMax = new Vector2(0, 1);
            accentRect.pivot = new Vector2(0, .5f);
            accentRect.sizeDelta = new Vector2(9, 0);
            _accent = accentObject.GetComponent<Image>();
            _accent.raycastTarget = false;

            var font = GetComponentInChildren<TMP_Text>(true)?.font;
            _title = CreateText("Title", _panel, font, new Vector2(.08f, .55f), new Vector2(.92f, .92f), 31, FontStyles.Bold);
            _detail = CreateText("Detail", _panel, font, new Vector2(.08f, .10f), new Vector2(.92f, .58f), 22, FontStyles.Normal);
            _detail.enableAutoSizing = true;
            _detail.fontSizeMin = 14;
            _detail.fontSizeMax = 22;
        }

        private static TMP_Text CreateText(string name, Transform parent, TMP_FontAsset? font, Vector2 anchorMin,
            Vector2 anchorMax, float fontSize, FontStyles style)
        {
            var textObject = new GameObject(name, typeof(RectTransform), typeof(CanvasRenderer), typeof(TextMeshProUGUI));
            var rect = textObject.GetComponent<RectTransform>();
            rect.SetParent(parent, false);
            rect.anchorMin = anchorMin;
            rect.anchorMax = anchorMax;
            rect.offsetMin = Vector2.zero;
            rect.offsetMax = Vector2.zero;
            var text = textObject.GetComponent<TextMeshProUGUI>();
            text.font = font;
            text.fontSize = fontSize;
            text.fontStyle = style;
            text.alignment = TextAlignmentOptions.Center;
            text.color = new Color(.95f, .93f, .87f, 1f);
            text.raycastTarget = false;
            return text;
        }

        private void SetVisible(bool visible)
        {
            if (_panel != null) _panel.gameObject.SetActive(visible);
        }

        private void OnDisable()
        {
            if (_panel != null)
            {
                _panel.localScale = Vector3.one;
                _panel.localRotation = Quaternion.identity;
            }
            if (_group != null) _group.alpha = 0f;
            SetVisible(false);
        }
    }
}