using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.UIElements;
using Button = UnityEngine.UI.Button;
using Image = UnityEngine.UI.Image;

namespace ADOFAIRenderer.UI
{
    public class DialogButton
    {
        public string Text;
        public Action OnClick;
        public Color? BackgroundColor;

        public DialogButton(string text, Action onClick, Color? backgroundColor = null)
        {
            Text = text;
            OnClick = onClick;
            BackgroundColor = backgroundColor;
        }
    }

    public class CommonWarningDialogUI : MonoBehaviour
    {
        public static CommonWarningDialogUI? Instance { get; private set; }
        private readonly List<VisualElement> _disabledElements = new();

        private void Awake()
        {
            Instance = this;
        }

        private void OnDestroy()
        {
            foreach (var elem in _disabledElements)
            {
                if (elem != null)
                {
                    elem.SetEnabled(true);
                }
            }
            _disabledElements.Clear();

            if (Instance == this)
            {
                Instance = null;
            }
        }

        private static TMP_FontAsset GetNanumSquareNeoBdFontAsset()
        {
            TMP_FontAsset? font = null;
            if (RenderMod.FontBundle)
            {
                try
                {
                    font = RenderMod.FontBundle.LoadAsset<TMP_FontAsset>("NanumSquareNeoOTF-Bd SDF");
                }
                catch
                {
                    // 로딩 실패
                }
            }

            // 폴백 처리
            if (!font)
            {
                try
                {
                    font = RDString.fontData.fontTMP;
                }
                catch
                {
                    // ignored
                }
            }
            if (!font)
            {
                // ReSharper disable once Unity.UnknownResource
                font = Resources.Load<TMP_FontAsset>("Fonts & Materials/LiberationSans SDF");
            }

            if (font) return font;
            var fonts = Resources.FindObjectsOfTypeAll<TMP_FontAsset>();
            if (fonts.Length > 0) font = fonts[0];

            return font!;
        }

        public static void ShowDialog(string title, string description, params DialogButton[] buttons)
        {
            if (buttons.Length == 0) return;

            var obj = new GameObject("CommonWarningDialogUI");
            DontDestroyOnLoad(obj);
            var dialog = obj.AddComponent<CommonWarningDialogUI>();
            dialog.Initialize(title, description, buttons);
        }

        private void Initialize(string title, string description, DialogButton[] buttons)
        {
            if (!UnityEngine.EventSystems.EventSystem.current)
            {
                var eventSystemObj = new GameObject("EventSystem");
                eventSystemObj.transform.SetParent(transform);
                eventSystemObj.AddComponent<UnityEngine.EventSystems.EventSystem>();
                eventSystemObj.AddComponent<UnityEngine.EventSystems.StandaloneInputModule>();
            }

            foreach (var doc in FindObjectsByType<UIDocument>(FindObjectsSortMode.None))
            {
                if (doc && doc.rootVisualElement != null && doc.rootVisualElement.enabledSelf)
                {
                    doc.rootVisualElement.SetEnabled(false);
                    _disabledElements.Add(doc.rootVisualElement);
                }
            }

            // UI 레이어(5) 설정
            gameObject.layer = 5;
            
            // Canvas 설정
            var canvas = gameObject.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 32766; // FFmpegDownloadUI(32767) 바로 아래
            
            // 해상도 대응 캔버스 스케일러 설정
            var scaler = gameObject.AddComponent<CanvasScaler>();
            scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            scaler.referenceResolution = new Vector2(1920, 1080);
            scaler.screenMatchMode = CanvasScaler.ScreenMatchMode.MatchWidthOrHeight;
            scaler.matchWidthOrHeight = 0.5f;
            
            gameObject.AddComponent<GraphicRaycaster>();
            
            // 1. 전체 화면 오버레이 배경 생성
            var bgPanelObj = new GameObject("BackgroundPanel");
            bgPanelObj.transform.SetParent(transform, false);
            bgPanelObj.layer = 5;
            
            var bgImage = bgPanelObj.AddComponent<Image>();
            bgImage.color = new Color(0f, 0f, 0f, 0.65f); // 어두운 투명 오버레이
            bgImage.raycastTarget = true;
            
            var bgRect = bgPanelObj.GetComponent<RectTransform>();
            bgRect.anchorMin = Vector2.zero;
            bgRect.anchorMax = Vector2.one;
            bgRect.offsetMin = Vector2.zero;
            bgRect.offsetMax = Vector2.zero;
            
            var font = GetNanumSquareNeoBdFontAsset();
            
            // 2. 모달 컨테이너 생성
            var modalContainerObj = new GameObject("ModalContainer");
            modalContainerObj.transform.SetParent(bgPanelObj.transform, false);
            modalContainerObj.layer = 5;
            
            var modalImage = modalContainerObj.AddComponent<Image>();
            modalImage.color = new Color(0.08f, 0.08f, 0.1f, 0.88f); // 기존 UI의 배경 톤과 동일
            
            var modalOutline = modalContainerObj.AddComponent<Outline>();
            modalOutline.effectColor = Color.white;
            modalOutline.effectDistance = new Vector2(3.0f, -3.0f); // 기존 UI 외곽선 스타일 일관성
            
            var modalRect = modalContainerObj.GetComponent<RectTransform>();
            modalRect.anchorMin = new Vector2(0.5f, 0.5f);
            modalRect.anchorMax = new Vector2(0.5f, 0.5f);
            modalRect.pivot = new Vector2(0.5f, 0.5f);
            modalRect.sizeDelta = new Vector2(650, 360);
            
            // 3. 타이틀 텍스트 생성
            var titleObj = new GameObject("TitleText");
            titleObj.transform.SetParent(modalContainerObj.transform, false);
            titleObj.layer = 5;
            
            var titleText = titleObj.AddComponent<TextMeshProUGUI>();
            titleText.text = title;
            titleText.fontSize = 24;
            titleText.font = font;
            titleText.color = new Color(1.0f, 0.8f, 0.2f, 1.0f); // 경고 테마에 맞는 주황/황색 계열
            titleText.alignment = TextAlignmentOptions.Center;
            
            var titleRect = titleObj.GetComponent<RectTransform>();
            titleRect.anchorMin = new Vector2(0, 1);
            titleRect.anchorMax = new Vector2(1, 1);
            titleRect.pivot = new Vector2(0.5f, 1);
            titleRect.anchoredPosition = new Vector2(0, -35);
            titleRect.sizeDelta = new Vector2(0, 40);
            
            // 4. 본문 설명 텍스트 생성
            var descObj = new GameObject("DescriptionText");
            descObj.transform.SetParent(modalContainerObj.transform, false);
            descObj.layer = 5;
            
            var descText = descObj.AddComponent<TextMeshProUGUI>();
            descText.text = description;
            descText.fontSize = 15;
            descText.font = font;
            descText.color = new Color(0.85f, 0.85f, 0.85f, 1f);
            descText.alignment = TextAlignmentOptions.Center;
            descText.lineSpacing = 8;
            
            var descRect = descObj.GetComponent<RectTransform>();
            descRect.anchorMin = new Vector2(0, 0.5f);
            descRect.anchorMax = new Vector2(1, 1);
            descRect.pivot = new Vector2(0.5f, 0.5f);
            descRect.anchoredPosition = new Vector2(0, -65);
            descRect.sizeDelta = new Vector2(-40, 120);
            
            // 5. 버튼 컨테이너 생성
            var buttonContainerObj = new GameObject("ButtonContainer", typeof(RectTransform));
            buttonContainerObj.transform.SetParent(modalContainerObj.transform, false);
            buttonContainerObj.layer = 5;
            
            var btnContainerRect = buttonContainerObj.GetComponent<RectTransform>();
            btnContainerRect.anchorMin = new Vector2(0, 0);
            btnContainerRect.anchorMax = new Vector2(1, 0);
            btnContainerRect.pivot = new Vector2(0.5f, 0);
            btnContainerRect.anchoredPosition = new Vector2(0, 35);
            btnContainerRect.sizeDelta = new Vector2(0, 50);

            // 6. 가변 버튼 동적 배치 및 스타일링
            float totalWidth = 560f;
            float spacing = 15f;
            float buttonHeight = 45f;
            int numButtons = buttons.Length;

            float buttonWidth = numButtons == 1 
                ? 200f 
                : (totalWidth - (spacing * (numButtons - 1))) / numButtons;

            float startX = numButtons == 1 
                ? 0 
                : (-totalWidth / 2f) + (buttonWidth / 2f);

            for (int i = 0; i < numButtons; i++)
            {
                var btnData = buttons[i];
                var btnObj = new GameObject($"Button_{i}");
                btnObj.transform.SetParent(buttonContainerObj.transform, false);
                btnObj.layer = 5;

                // 기본 색상 정의
                Color baseColor = btnData.BackgroundColor ?? new Color(0.2f, 0.2f, 0.23f, 1f); // 커스텀 색상 또는 회색톤 기본값
                Color hoverColor = ApplyColorBrightness(baseColor, 1.2f);
                Color pressedColor = ApplyColorBrightness(baseColor, 0.8f);

                var btnImage = btnObj.AddComponent<Image>();
                btnImage.color = baseColor;
                btnImage.raycastTarget = true;

                var btn = btnObj.AddComponent<Button>();
                SetupButtonStyle(btn, baseColor, hoverColor, pressedColor);
                
                // 클릭 콜백 등록
                btn.onClick.AddListener(() =>
                {
                    try
                    {
                        btnData.OnClick();
                    }
                    catch (Exception ex)
                    {
                        MelonLoader.Melon<RenderMod>.Logger.Error($"Dialog Button Click Event Error: {ex}");
                    }
                    Destroy(gameObject);
                });
                
                var btnRect = btnObj.GetComponent<RectTransform>();
                btnRect.anchorMin = new Vector2(0.5f, 0.5f);
                btnRect.anchorMax = new Vector2(0.5f, 0.5f);
                btnRect.pivot = new Vector2(0.5f, 0.5f);
                
                float posX = numButtons == 1 
                    ? 0 
                    : startX + i * (buttonWidth + spacing);
                
                btnRect.anchoredPosition = new Vector2(posX, 0);
                btnRect.sizeDelta = new Vector2(buttonWidth, buttonHeight);

                // 텍스트 라벨 추가
                var txtObj = new GameObject("Text");
                txtObj.transform.SetParent(btnObj.transform, false);
                txtObj.layer = 5;

                var text = txtObj.AddComponent<TextMeshProUGUI>();
                text.text = btnData.Text;
                text.fontSize = 14;
                text.font = font;
                text.color = Color.white;
                text.alignment = TextAlignmentOptions.Center;

                var txtRect = txtObj.GetComponent<RectTransform>();
                txtRect.anchorMin = Vector2.zero;
                txtRect.anchorMax = Vector2.one;
                txtRect.offsetMin = Vector2.zero;
                txtRect.offsetMax = Vector2.zero;
            }
        }

        private void SetupButtonStyle(Button button, Color normalColor, Color hoverColor, Color pressedColor)
        {
            button.transition = Selectable.Transition.ColorTint;
            var colors = button.colors;
            colors.normalColor = normalColor;
            colors.highlightedColor = hoverColor;
            colors.pressedColor = pressedColor;
            colors.disabledColor = new Color(0.3f, 0.3f, 0.3f, 1f);
            button.colors = colors;
        }

        private Color ApplyColorBrightness(Color color, float factor)
        {
            float r = Mathf.Clamp01(color.r * factor);
            float g = Mathf.Clamp01(color.g * factor);
            float b = Mathf.Clamp01(color.b * factor);
            return new Color(r, g, b, color.a);
        }
    }
}