using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;

namespace Tech3C
{
    /// <summary>
    /// Simple demo that creates UI programmatically
    /// Just attach this script to any GameObject in your scene
    /// </summary>
    public class Tech3CSimpleDemo : MonoBehaviour
    {
        [Header("Configuration")]
        public string clientId = "your_client_id";
        public string clientSecret = "your_client_secret";

        private Canvas canvas;
        private Text logText;
        private AuthCallback authCallback;
        private LogoutCallback logoutCallback;
        
        private GameObject dialogPanel;
        private Text dialogText;
        private Button dialogCloseButton;

        private void Start()
        {
            EnsureEventSystem();
            CreateUI();
            SetupCallbacks();
            
            // Auto-initialize SDK
            if (!string.IsNullOrEmpty(clientId) && !string.IsNullOrEmpty(clientSecret))
            {
                Log($"Initializing Tech3C SDK...\n  Client ID: {clientId}");
                Tech3CSDK.Instance.Initialize(clientId, clientSecret);
                
                if (Tech3CSDK.Instance.IsInitialized)
                {
                    Log("✓ SDK Initialized Successfully!");
                }
                else
                {
                    Log("✗ Failed to initialize SDK");
                }
            }
            else
            {
                Log("⚠ Client ID and/or Client Secret not set. Please configure in Inspector.");
            }
            
            Debug.Log("[Tech3C Demo] Tech3C SDK Simple Demo Started");
        }

        private void EnsureEventSystem()
        {
            if (EventSystem.current == null)
            {
                GameObject eventSystemGO = new GameObject("EventSystem");
                eventSystemGO.AddComponent<EventSystem>();
                eventSystemGO.AddComponent<StandaloneInputModule>();
                Debug.Log("[Tech3C Demo] EventSystem created");
            }
        }

        private void CreateUI()
        {
            // Create Canvas
            GameObject canvasGO = new GameObject("Tech3CDemoCanvas");
            canvasGO.transform.SetParent(transform);
            canvas = canvasGO.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            
            // Configure CanvasScaler for responsive 16:9 ratio
            CanvasScaler canvasScaler = canvasGO.AddComponent<CanvasScaler>();
            canvasScaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            canvasScaler.referenceResolution = new Vector2(1920, 1080); // 16:9 ratio
            canvasScaler.screenMatchMode = CanvasScaler.ScreenMatchMode.MatchWidthOrHeight;
            canvasScaler.matchWidthOrHeight = 0.5f; // Balance between width and height
            
            canvasGO.AddComponent<GraphicRaycaster>();

            // Create Scroll Panel
            GameObject scrollPanel = new GameObject("ScrollPanel");
            scrollPanel.transform.SetParent(canvasGO.transform, false);
            RectTransform scrollPanelRect = scrollPanel.AddComponent<RectTransform>();
            scrollPanelRect.anchorMin = Vector2.zero;
            scrollPanelRect.anchorMax = Vector2.one;
            scrollPanelRect.sizeDelta = Vector2.zero;
            Image scrollPanelImage = scrollPanel.AddComponent<Image>();
            scrollPanelImage.color = new Color(0.2f, 0.2f, 0.2f, 1f);

            // Create ScrollRect
            ScrollRect scrollRect = scrollPanel.AddComponent<ScrollRect>();
            scrollRect.horizontal = false;
            scrollRect.vertical = true;
            scrollRect.scrollSensitivity = 50f;

            // Create Content Panel
            GameObject panel = new GameObject("Content");
            panel.transform.SetParent(scrollPanel.transform, false);
            RectTransform panelRect = panel.AddComponent<RectTransform>();
            panelRect.anchorMin = new Vector2(0, 1);
            panelRect.anchorMax = new Vector2(1, 1);
            panelRect.pivot = new Vector2(0.5f, 1f);
            panelRect.sizeDelta = new Vector2(0, 0);
            scrollRect.content = panelRect;

            // Create Vertical Layout Group
            VerticalLayoutGroup layoutGroup = panel.AddComponent<VerticalLayoutGroup>();
            layoutGroup.childControlHeight = false;
            layoutGroup.childControlWidth = true;
            layoutGroup.childForceExpandWidth = true;
            layoutGroup.childForceExpandHeight = false;
            layoutGroup.spacing = 15;
            layoutGroup.padding = new RectOffset(40, 40, 40, 40);
            ContentSizeFitter contentSizeFitter = panel.AddComponent<ContentSizeFitter>();
            contentSizeFitter.verticalFit = ContentSizeFitter.FitMode.PreferredSize;

            // Create Title
            CreateTextResponsive(panel.transform, "Tech3C SDK Demo", 28, TextAnchor.MiddleCenter, 60);

            // Create Separator
            CreateTextResponsive(panel.transform, "--- Authentication ---", 18, TextAnchor.MiddleCenter, 30);

            // Create Show Auth Button
            Button showAuthButton = CreateButtonResponsive(panel.transform, "Show Auth Screen", 70);
            showAuthButton.onClick.AddListener(OnShowAuthClick);

            // Create Logout Button
            Button logoutButton = CreateButtonResponsive(panel.transform, "Logout", 70);
            logoutButton.onClick.AddListener(OnLogoutClick);

            // Create Log Text
            CreateTextResponsive(panel.transform, "Logs:", 16, TextAnchor.MiddleLeft, 35);
            logText = CreateTextResponsive(panel.transform, "Ready...", 16, TextAnchor.MiddleLeft, 400);
            logText.color = Color.green;

            // Reposition panel
            panelRect.anchoredPosition = Vector2.zero;
        }

        private void SetupCallbacks()
        {
            // Auth callback
            authCallback = new AuthCallback();
            authCallback.OnAuthSuccessEvent += (userId, password, accessToken, refreshToken, loginType, expiryTime) =>
            {
                Debug.Log($"[Tech3C Demo] === AUTH SUCCESS CALLBACK FIRED ===");
                Debug.Log($"[Tech3C Demo] UserId: {userId}");
                Debug.Log($"[Tech3C Demo] Password: {password?.Substring(0, Math.Min(3, password?.Length ?? 0))}...");
                Debug.Log($"[Tech3C Demo] LoginType: {loginType}");
                Debug.Log($"[Tech3C Demo] AccessToken: {accessToken?.Substring(0, Math.Min(20, accessToken?.Length ?? 0))}...");
                Debug.Log($"[Tech3C Demo] RefreshToken: {refreshToken?.Substring(0, Math.Min(20, refreshToken?.Length ?? 0))}...");
                Debug.Log($"[Tech3C Demo] ExpiryTime: {expiryTime}");
                
                Log($"✓ Auth Success!\n  User ID: {userId}\n  Password: {password}\n  Login Type: {loginType}\n  Token: {accessToken?.Substring(0, Math.Min(20, accessToken?.Length ?? 0))}...");

                ShowAuthSuccessDialog(userId, password, loginType.ToString());
            };
            authCallback.OnAuthCancelledEvent += () =>
            {
                Debug.Log($"[Tech3C Demo] === AUTH CANCELLED CALLBACK FIRED ===");
                Log("✗ Auth Cancelled by user");
            };
            authCallback.OnAuthErrorEvent += (errorCode, errorMessage) =>
            {
                Debug.Log($"[Tech3C Demo] === AUTH ERROR CALLBACK FIRED ===");
                Debug.Log($"[Tech3C Demo] ErrorCode: {errorCode}");
                Debug.Log($"[Tech3C Demo] ErrorMessage: {errorMessage}");
                Log($"✗ Auth Error [{errorCode}]: {errorMessage}");
            };

            // Logout callback
            logoutCallback = new LogoutCallback();
            logoutCallback.OnLogoutSuccessEvent += () =>
            {
                Debug.Log($"[Tech3C Demo] === LOGOUT SUCCESS CALLBACK FIRED ===");
                Log("✓ Logout Successful");
            };
            logoutCallback.OnLogoutErrorEvent += (errorCode, errorMessage) =>
            {
                Debug.Log($"[Tech3C Demo] === LOGOUT ERROR CALLBACK FIRED ===");
                Debug.Log($"[Tech3C Demo] ErrorCode: {errorCode}");
                Debug.Log($"[Tech3C Demo] ErrorMessage: {errorMessage}");
                Log($"✗ Logout Error [{errorCode}]: {errorMessage}");
            };
        }

        #region Button Handlers

        private void OnInitializeClick(string newClientId, string newClientSecret)
        {
            if (string.IsNullOrEmpty(newClientId) || string.IsNullOrEmpty(newClientSecret))
            {
                Log("✗ Client ID and Client Secret are required!");
                return;
            }

            clientId = newClientId;
            clientSecret = newClientSecret;

            Log($"Initializing Tech3C SDK...\n  Client ID: {clientId}");
            Tech3CSDK.Instance.Initialize(clientId, clientSecret);

            if (Tech3CSDK.Instance.IsInitialized)
            {
                Log("✓ SDK Initialized Successfully!");
            }
            else
            {
                Log("✗ Failed to initialize SDK");
            }
        }

        private void OnShowAuthClick()
        {
            if (!Tech3CSDK.Instance.IsInitialized)
            {
                Log("✗ SDK not initialized. Click Initialize first!");
                return;
            }

            Log("Opening Auth Screen...");
            Tech3CSDK.Instance.ShowAuth(authCallback);
        }

        private void OnLogoutClick()
        {
            if (!Tech3CSDK.Instance.IsInitialized)
            {
                Log("✗ SDK not initialized.");
                return;
            }

            Log("Logging out...");
            Tech3CSDK.Instance.Logout(logoutCallback);
        }

        #endregion

        #region UI Helper Methods

        private Button CreateButton(Transform parent, string text, float width, float height)
        {
            GameObject buttonGO = new GameObject(text.Replace(" ", "_"));
            buttonGO.transform.SetParent(parent, false);

            RectTransform rect = buttonGO.AddComponent<RectTransform>();
            rect.sizeDelta = new Vector2(width, height);

            Image image = buttonGO.AddComponent<Image>();
            image.color = new Color(0.3f, 0.5f, 0.8f, 1f);

            Button button = buttonGO.AddComponent<Button>();
            
            // Set up button transition for visual feedback
            ColorBlock colors = button.colors;
            colors.normalColor = new Color(0.3f, 0.5f, 0.8f, 1f);
            colors.highlightedColor = new Color(0.4f, 0.6f, 0.9f, 1f);
            colors.pressedColor = new Color(0.2f, 0.4f, 0.7f, 1f);
            colors.selectedColor = new Color(0.3f, 0.5f, 0.8f, 1f);
            colors.colorMultiplier = 1f;
            button.colors = colors;

            GameObject textGO = new GameObject("Text");
            textGO.transform.SetParent(buttonGO.transform, false);

            RectTransform textRect = textGO.AddComponent<RectTransform>();
            textRect.anchorMin = Vector2.zero;
            textRect.anchorMax = Vector2.one;
            textRect.sizeDelta = Vector2.zero;

            Text textComponent = textGO.AddComponent<Text>();
            textComponent.text = text;
            textComponent.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            textComponent.fontSize = 18;
            textComponent.alignment = TextAnchor.MiddleCenter;
            textComponent.color = Color.white;
            textComponent.raycastTarget = false; // Important: Allow click to pass through to button

            Debug.Log($"[Tech3C Demo] Created button: {text}");
            return button;
        }

        private Text CreateText(Transform parent, string text, int fontSize, TextAnchor alignment, float width, float height)
        {
            GameObject textGO = new GameObject("Text");
            textGO.transform.SetParent(parent, false);

            RectTransform rect = textGO.AddComponent<RectTransform>();
            rect.sizeDelta = new Vector2(width, height);

            Text textComponent = textGO.AddComponent<Text>();
            textComponent.text = text;
            textComponent.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            textComponent.fontSize = fontSize;
            textComponent.alignment = alignment;
            textComponent.color = Color.white;
            textComponent.raycastTarget = false; // Prevent text from blocking button clicks

            return textComponent;
        }

        private Text CreateLabel(Transform parent, string text)
        {
            return CreateText(parent, text, 14, TextAnchor.MiddleLeft, 500, 30);
        }

        private InputField CreateInputField(Transform parent, string defaultValue)
        {
            GameObject inputGO = new GameObject("InputField");
            inputGO.transform.SetParent(parent, false);

            RectTransform rect = inputGO.AddComponent<RectTransform>();
            rect.sizeDelta = new Vector2(500, 40);

            Image image = inputGO.AddComponent<Image>();
            image.color = new Color(0.3f, 0.3f, 0.3f, 1f);

            InputField inputField = inputGO.AddComponent<InputField>();
            inputField.textComponent = CreateText(inputGO.transform, defaultValue, 16, TextAnchor.MiddleLeft, 500, 40);
            inputField.textComponent.color = Color.black;
            inputField.textComponent.raycastTarget = false; // Prevent text from blocking input
            inputField.lineType = InputField.LineType.MultiLineSubmit;
            
            Debug.Log($"[Tech3C Demo] Created input field with default value");
            return inputField;
        }

        private void Log(string message)
        {
            Debug.Log($"[Tech3C Demo] {message}");
            if (logText != null)
            {
                string timestamp = System.DateTime.Now.ToString("HH:mm:ss");
                logText.text = $"[{timestamp}] {message}\n{logText.text}";
            }
        }

        #endregion

        #region Responsive UI Helper Methods

        private Button CreateButtonResponsive(Transform parent, string text, float height)
        {
            GameObject buttonGO = new GameObject(text.Replace(" ", "_"));
            buttonGO.transform.SetParent(parent, false);

            RectTransform rect = buttonGO.AddComponent<RectTransform>();
            rect.anchorMin = new Vector2(0, 0);
            rect.anchorMax = new Vector2(1, 0);
            rect.pivot = new Vector2(0.5f, 0.5f);
            rect.sizeDelta = new Vector2(-80, height); // -80 for left/right padding

            Image image = buttonGO.AddComponent<Image>();
            image.color = new Color(0.3f, 0.5f, 0.8f, 1f);

            Button button = buttonGO.AddComponent<Button>();
            
            // Set up button transition for visual feedback
            ColorBlock colors = button.colors;
            colors.normalColor = new Color(0.3f, 0.5f, 0.8f, 1f);
            colors.highlightedColor = new Color(0.4f, 0.6f, 0.9f, 1f);
            colors.pressedColor = new Color(0.2f, 0.4f, 0.7f, 1f);
            colors.selectedColor = new Color(0.3f, 0.5f, 0.8f, 1f);
            colors.colorMultiplier = 1f;
            button.colors = colors;

            GameObject textGO = new GameObject("Text");
            textGO.transform.SetParent(buttonGO.transform, false);

            RectTransform textRect = textGO.AddComponent<RectTransform>();
            textRect.anchorMin = Vector2.zero;
            textRect.anchorMax = Vector2.one;
            textRect.sizeDelta = Vector2.zero;

            Text textComponent = textGO.AddComponent<Text>();
            textComponent.text = text;
            textComponent.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            textComponent.fontSize = 22;
            textComponent.alignment = TextAnchor.MiddleCenter;
            textComponent.color = Color.white;
            textComponent.raycastTarget = false;

            return button;
        }

        private Text CreateTextResponsive(Transform parent, string text, int fontSize, TextAnchor alignment, float height)
        {
            GameObject textGO = new GameObject("Text");
            textGO.transform.SetParent(parent, false);

            RectTransform rect = textGO.AddComponent<RectTransform>();
            rect.anchorMin = new Vector2(0, 0);
            rect.anchorMax = new Vector2(1, 0);
            rect.pivot = new Vector2(0.5f, 0.5f);
            rect.sizeDelta = new Vector2(0, height);

            Text textComponent = textGO.AddComponent<Text>();
            textComponent.text = text;
            textComponent.font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
            textComponent.fontSize = fontSize;
            textComponent.alignment = alignment;
            textComponent.color = Color.white;
            textComponent.raycastTarget = false;

            return textComponent;
        }

        private void ShowAuthSuccessDialog(string userId, string password, string loginType)
        {
            // Remove existing dialog if any
            if (dialogPanel != null)
            {
                Destroy(dialogPanel);
            }

            // Create dialog background (full screen overlay)
            GameObject overlayGO = new GameObject("DialogOverlay");
            overlayGO.transform.SetParent(canvas.transform, false);
            RectTransform overlayRect = overlayGO.AddComponent<RectTransform>();
            overlayRect.anchorMin = Vector2.zero;
            overlayRect.anchorMax = Vector2.one;
            overlayRect.sizeDelta = Vector2.zero;
            Image overlayImage = overlayGO.AddComponent<Image>();
            overlayImage.color = new Color(0, 0, 0, 0.7f); // Semi-transparent black

            // Create dialog panel
            dialogPanel = new GameObject("AuthSuccessDialog");
            dialogPanel.transform.SetParent(overlayGO.transform, false);
            RectTransform dialogRect = dialogPanel.AddComponent<RectTransform>();
            dialogRect.anchorMin = new Vector2(0.3f, 0.4f);
            dialogRect.anchorMax = new Vector2(0.7f, 0.6f);
            dialogRect.offsetMin = Vector2.zero;
            dialogRect.offsetMax = Vector2.zero;
            Image dialogImage = dialogPanel.AddComponent<Image>();
            dialogImage.color = new Color(0.15f, 0.35f, 0.15f, 1f);

            // Create vertical layout group for dialog
            VerticalLayoutGroup dialogLayout = dialogPanel.AddComponent<VerticalLayoutGroup>();
            dialogLayout.childControlHeight = false;
            dialogLayout.childControlWidth = true;
            dialogLayout.childForceExpandWidth = true;
            dialogLayout.childAlignment = TextAnchor.MiddleCenter;
            dialogLayout.spacing = 20;
            dialogLayout.padding = new RectOffset(20, 20, 20, 20);
            ContentSizeFitter dialogFitter = dialogPanel.AddComponent<ContentSizeFitter>();
            dialogFitter.verticalFit = ContentSizeFitter.FitMode.PreferredSize;

            // Create success message
            Text successTitle = CreateText(dialogPanel.transform, "✓ LOGIN SUCCESSFUL", 32, TextAnchor.MiddleCenter, 400, 50);
            successTitle.color = Color.green;

            // Create user info
            string userInfoText = $"User ID: {userId}\nPassword: {password}\nLogin Type: {loginType}";
            Text userInfoComponent = CreateText(dialogPanel.transform, userInfoText, 20, TextAnchor.MiddleCenter, 400, 80);
            userInfoComponent.color = Color.white;

            // Create close button
            dialogCloseButton = CreateButton(dialogPanel.transform, "OK", 200, 50);
            dialogCloseButton.onClick.AddListener(() =>
            {
                Debug.Log("[Tech3C Demo] Dialog close button clicked");
                Destroy(overlayGO);
                dialogPanel = null;
            });
        }

        #endregion
    }
}