using UnityEngine;
using UnityEngine.UIElements;
using System.Collections.Generic;
using System.Linq;

/// <summary>
/// Beautiful UI popup for combat event encounters
/// Shows enemy details and provides options to attack or run away
/// Uses UXML template for cleaner UI structure
/// </summary>
public class CombatEventPopupUXML : MonoBehaviour, IClickBlocker
{
    [Header("UI References")]
    public UIDocument uiDocument;
    public VisualTreeAsset popupTemplate; // UXML template
    public StyleSheet popupStyleSheet; // USS styles

    [Header("Popup Settings")]
    public float animationDuration = 0.3f;
    public float backgroundBlurIntensity = 0.5f;

    [Header("Debug")]
    public bool debugMode = false;

    // Events
    public System.Action<bool> OnCombatDecision; // true = attack, false = run away

    // UI Elements (from UXML)
    private VisualElement popupContainer;
    private VisualElement backgroundOverlay;
    private VisualElement popupPanel;
    private Label eventTitleLabel;
    private Label eventDescriptionLabel;
    private VisualElement enemyListContainer;
    private VisualElement enemyItemTemplate;
    private Button attackButton;
    private Button runAwayButton;

    // Current combat data
    private BattleEventData currentBattleData;
    private TravelEventContext currentContext;
    private bool isPopupActive = false;

    void Awake()
    {
        // Find UI Document if not assigned
        if (uiDocument == null)
            uiDocument = GetComponent<UIDocument>();

        if (uiDocument == null)
        {
            Debug.LogError("CombatEventPopupUXML: No UIDocument found! Please assign one.");
            return;
        }

        SetupUI();
    }

    void OnEnable()
    {
        // Register with ClickManager when this component is enabled
        if (ClickManager.Instance != null)
        {
            ClickManager.Instance.RegisterClickBlocker(this);
        }
    }

    void OnDisable()
    {
        // Unregister from ClickManager when this component is disabled
        if (ClickManager.Instance != null)
        {
            ClickManager.Instance.UnregisterClickBlocker(this);
        }
    }

    void OnDestroy()
    {
        // Ensure we're unregistered when destroyed
        if (ClickManager.Instance != null)
        {
            ClickManager.Instance.UnregisterClickBlocker(this);
        }
    }

    void SetupUI()
    {
        var root = uiDocument.rootVisualElement;
        if (debugMode) Debug.Log($"🔧 SetupUI: Root element size: {root.resolvedStyle.width}x{root.resolvedStyle.height}");

        // Load and instantiate UXML template
        if (popupTemplate != null)
        {
            // Clone the template
            var template = popupTemplate.Instantiate();
            root.Add(template);
            if (debugMode) Debug.Log($"✅ UXML template instantiated and added to root");

            // Apply style sheet
            if (popupStyleSheet != null)
            {
                root.styleSheets.Add(popupStyleSheet);
                if (debugMode) Debug.Log($"✅ USS stylesheet applied");
            }
            else
            {
                Debug.LogWarning("⚠️ No USS stylesheet assigned");
            }
        }
        else
        {
            Debug.LogWarning("No UXML template assigned, creating UI programmatically as fallback");
            CreateUIFallback(root);
        }

        // Cache UI element references
        CacheUIElements(root);

        // Setup event handlers
        if (backgroundOverlay != null)
        {
            // Block all mouse events from reaching the map below
            backgroundOverlay.RegisterCallback<ClickEvent>(OnBackgroundClick);
            backgroundOverlay.RegisterCallback<MouseDownEvent>(OnBackgroundMouseDown);
            backgroundOverlay.RegisterCallback<MouseUpEvent>(OnBackgroundMouseUp);
            backgroundOverlay.RegisterCallback<MouseMoveEvent>(OnBackgroundMouseMove);
            backgroundOverlay.RegisterCallback<WheelEvent>(OnBackgroundWheelEvent);
        }

        if (attackButton != null)
            attackButton.clicked += OnAttackClicked;

        if (runAwayButton != null)
            runAwayButton.clicked += OnRunAwayClicked;

        // Initially hide the popup
        HidePopup();
    }

    void CacheUIElements(VisualElement root)
    {
        // Cache references to UI elements by name/class
        popupContainer = root.Q<VisualElement>("combat-event-popup");
        backgroundOverlay = root.Q<VisualElement>("background-overlay");
        popupPanel = root.Q<VisualElement>("popup-panel");
        eventTitleLabel = root.Q<Label>("event-title");
        eventDescriptionLabel = root.Q<Label>("event-description");
        enemyListContainer = root.Q<VisualElement>("enemy-list");
        enemyItemTemplate = root.Q<VisualElement>("enemy-item-template");
        attackButton = root.Q<Button>("attack-button");
        runAwayButton = root.Q<Button>("run-away-button");

        // Debug what we found
        if (debugMode)
        {
            Debug.Log($"🔍 UI Elements found:");
            Debug.Log($"   popupContainer: {(popupContainer != null ? "✅" : "❌")}");
            Debug.Log($"   backgroundOverlay: {(backgroundOverlay != null ? "✅" : "❌")}");
            Debug.Log($"   popupPanel: {(popupPanel != null ? "✅" : "❌")}");
            Debug.Log($"   eventTitleLabel: {(eventTitleLabel != null ? "✅" : "❌")}");
            Debug.Log($"   attackButton: {(attackButton != null ? "✅" : "❌")}");
            Debug.Log($"   runAwayButton: {(runAwayButton != null ? "✅" : "❌")}");
        }

        // Hide the template
        if (enemyItemTemplate != null)
            enemyItemTemplate.style.display = DisplayStyle.None;

        // Debug missing elements
        if (popupContainer == null) Debug.LogError("Could not find 'combat-event-popup' element");
        if (attackButton == null) Debug.LogError("Could not find 'attack-button' element");
        if (runAwayButton == null) Debug.LogError("Could not find 'run-away-button' element");
    }

    /// <summary>
    /// Fallback UI creation if UXML template is not available
    /// </summary>
    void CreateUIFallback(VisualElement root)
    {
        // Create basic popup structure programmatically
        popupContainer = new VisualElement();
        popupContainer.name = "combat-event-popup";
        popupContainer.style.position = Position.Absolute;
        popupContainer.style.top = 0;
        popupContainer.style.left = 0;
        popupContainer.style.right = 0;
        popupContainer.style.bottom = 0;
        popupContainer.style.justifyContent = Justify.Center;
        popupContainer.style.alignItems = Align.Center;

        backgroundOverlay = new VisualElement();
        backgroundOverlay.name = "background-overlay";
        backgroundOverlay.style.position = Position.Absolute;
        backgroundOverlay.style.top = 0;
        backgroundOverlay.style.left = 0;
        backgroundOverlay.style.right = 0;
        backgroundOverlay.style.bottom = 0;
        backgroundOverlay.style.backgroundColor = new Color(0, 0, 0, 0.7f);

        popupPanel = new VisualElement();
        popupPanel.name = "popup-panel";
        popupPanel.style.backgroundColor = new Color(0.15f, 0.15f, 0.2f, 0.95f);
        popupPanel.style.borderTopLeftRadius = 10;
        popupPanel.style.borderTopRightRadius = 10;
        popupPanel.style.borderBottomLeftRadius = 10;
        popupPanel.style.borderBottomRightRadius = 10;
        popupPanel.style.minWidth = 400;
        popupPanel.style.paddingTop = 20;
        popupPanel.style.paddingBottom = 20;
        popupPanel.style.paddingLeft = 20;
        popupPanel.style.paddingRight = 20;

        eventTitleLabel = new Label("*** COMBAT ENCOUNTER! ***");
        eventTitleLabel.name = "event-title";
        eventTitleLabel.style.fontSize = 24;
        eventTitleLabel.style.unityTextAlign = TextAnchor.MiddleCenter;

        eventDescriptionLabel = new Label();
        eventDescriptionLabel.name = "event-description";

        enemyListContainer = new VisualElement();
        enemyListContainer.name = "enemy-list";

        var buttonContainer = new VisualElement();
        buttonContainer.style.flexDirection = FlexDirection.Row;
        buttonContainer.style.justifyContent = Justify.SpaceAround;
        buttonContainer.style.marginTop = 20;

        runAwayButton = new Button();
        runAwayButton.name = "run-away-button";
        runAwayButton.text = "[FLEE] RUN AWAY";

        attackButton = new Button();
        attackButton.name = "attack-button";
        attackButton.text = "[FIGHT] ATTACK!";

        // Assemble the UI
        buttonContainer.Add(runAwayButton);
        buttonContainer.Add(attackButton);

        popupPanel.Add(eventTitleLabel);
        popupPanel.Add(eventDescriptionLabel);
        popupPanel.Add(enemyListContainer);
        popupPanel.Add(buttonContainer);

        popupContainer.Add(backgroundOverlay);
        popupContainer.Add(popupPanel);
        root.Add(popupContainer);
    }

    /// <summary>
    /// Show the combat encounter popup with battle data
    /// </summary>
    public void ShowCombatEncounter(BattleEventData battleData, TravelEventContext context, string description)
    {
        if (isPopupActive)
        {
            Debug.LogWarning("Combat popup is already active!");
            return;
        }

        currentBattleData = battleData;
        currentContext = context;
        isPopupActive = true;

        if (debugMode) Debug.Log($"🎭 Showing combat popup with {battleData.enemyCount} {battleData.enemyType}(s)");

        // Update UI content
        UpdatePopupContent(battleData, description);

        // Show popup with animation
        ShowPopup();
    }

    void UpdatePopupContent(BattleEventData battleData, string description)
    {
        // Update description
        if (eventDescriptionLabel != null)
            eventDescriptionLabel.text = description;

        // Clear existing enemy items
        if (enemyListContainer != null)
        {
            var existingItems = enemyListContainer.Children().Where(child =>
                child.name != "enemy-item-template").ToList();

            foreach (var item in existingItems)
            {
                enemyListContainer.Remove(item);
            }

            // Create enemy display items
            CreateEnemyDisplays(battleData);
        }
    }

    void CreateEnemyDisplays(BattleEventData battleData)
    {
        if (battleData.enemyCharacterData == null)
        {
            Debug.LogWarning("No enemy character data available for display");
            return;
        }

        var enemyData = battleData.enemyCharacterData;

        // Create enemy item element
        VisualElement enemyItem;

        if (enemyItemTemplate != null)
        {
            // Clone the template by creating a new instance from the UXML
            enemyItem = CreateEnemyItemFromTemplate();
        }
        else
        {
            // Create manually if no template
            enemyItem = CreateEnemyItemFallback();
        }

        // Update enemy information
        var nameLabel = enemyItem.Q<Label>("enemy-name");
        var statsLabel = enemyItem.Q<Label>("enemy-stats");
        var weaponLabel = enemyItem.Q<Label>("enemy-weapon");
        var threatIndicator = enemyItem.Q<VisualElement>("threat-indicator");
        var threatLabel = enemyItem.Q<Label>("threat-label");

        if (nameLabel != null)
            nameLabel.text = $"{battleData.enemyCount}x {enemyData.enemyName}";

        if (statsLabel != null)
            statsLabel.text = $"HP: {enemyData.maxHealth} | AC: {enemyData.armorClass} | Threat: {enemyData.threatLevel}";

        if (weaponLabel != null && enemyData.preferredWeapon != null)
            weaponLabel.text = $"[WEAPON] {enemyData.preferredWeapon.itemName}";

        // Update threat indicator
        if (threatIndicator != null && threatLabel != null)
        {
            threatLabel.text = $"T{enemyData.threatLevel}";

            // Remove existing threat classes
            threatIndicator.RemoveFromClassList("threat-low");
            threatIndicator.RemoveFromClassList("threat-medium");
            threatIndicator.RemoveFromClassList("threat-high");
            threatIndicator.RemoveFromClassList("threat-extreme");

            // Add appropriate threat class
            if (enemyData.threatLevel <= 2)
                threatIndicator.AddToClassList("threat-low");
            else if (enemyData.threatLevel <= 4)
                threatIndicator.AddToClassList("threat-medium");
            else if (enemyData.threatLevel <= 6)
                threatIndicator.AddToClassList("threat-high");
            else
                threatIndicator.AddToClassList("threat-extreme");
        }

        // Add hover effect
        enemyItem.RegisterCallback<MouseEnterEvent>(evt =>
        {
            enemyItem.AddToClassList("enemy-item-hover");
        });

        enemyItem.RegisterCallback<MouseLeaveEvent>(evt =>
        {
            enemyItem.RemoveFromClassList("enemy-item-hover");
        });

        enemyListContainer.Add(enemyItem);
    }

    VisualElement CreateEnemyItemFromTemplate()
    {
        // Create a new enemy item based on the template structure
        var item = new VisualElement();
        item.style.flexDirection = FlexDirection.Row;
        item.style.justifyContent = Justify.SpaceBetween;
        item.style.alignItems = Align.Center;
        item.style.marginBottom = 8;
        item.style.paddingTop = 8;
        item.style.paddingBottom = 8;
        item.style.paddingLeft = 10;
        item.style.paddingRight = 10;
        item.style.backgroundColor = new Color(0.2f, 0.2f, 0.25f, 0.6f);
        item.style.borderTopLeftRadius = 4;
        item.style.borderTopRightRadius = 4;
        item.style.borderBottomLeftRadius = 4;
        item.style.borderBottomRightRadius = 4;
        item.AddToClassList("enemy-item");

        // Enemy info container
        var infoContainer = new VisualElement();
        infoContainer.name = "enemy-info";
        infoContainer.AddToClassList("enemy-info");
        infoContainer.style.flexDirection = FlexDirection.Column;
        infoContainer.style.flexGrow = 1;

        // Enemy name label
        var nameLabel = new Label();
        nameLabel.name = "enemy-name";
        nameLabel.AddToClassList("enemy-name");
        nameLabel.style.fontSize = 16;
        nameLabel.style.color = new Color(1f, 0.9f, 0.7f, 1f);

        // Enemy stats label
        var statsLabel = new Label();
        statsLabel.name = "enemy-stats";
        statsLabel.AddToClassList("enemy-stats");
        statsLabel.style.fontSize = 12;
        statsLabel.style.color = new Color(0.8f, 0.8f, 0.8f, 1f);

        // Enemy weapon label
        var weaponLabel = new Label();
        weaponLabel.name = "enemy-weapon";
        weaponLabel.AddToClassList("enemy-weapon");
        weaponLabel.style.fontSize = 11;
        weaponLabel.style.color = new Color(0.7f, 0.7f, 1f, 1f);

        // Threat indicator
        var threatIndicator = new VisualElement();
        threatIndicator.name = "threat-indicator";
        threatIndicator.AddToClassList("threat-indicator");
        threatIndicator.style.width = 60;
        threatIndicator.style.height = 20;
        threatIndicator.style.borderTopLeftRadius = 10;
        threatIndicator.style.borderTopRightRadius = 10;
        threatIndicator.style.borderBottomLeftRadius = 10;
        threatIndicator.style.borderBottomRightRadius = 10;
        threatIndicator.style.justifyContent = Justify.Center;
        threatIndicator.style.alignItems = Align.Center;
        threatIndicator.style.backgroundColor = new Color(0.3f, 0.8f, 0.3f, 1f);

        // Threat label
        var threatLabel = new Label();
        threatLabel.name = "threat-label";
        threatLabel.AddToClassList("threat-label");
        threatLabel.style.fontSize = 11;
        threatLabel.style.color = Color.white;

        // Assemble the structure
        threatIndicator.Add(threatLabel);
        infoContainer.Add(nameLabel);
        infoContainer.Add(statsLabel);
        infoContainer.Add(weaponLabel);
        item.Add(infoContainer);
        item.Add(threatIndicator);

        return item;
    }

    VisualElement CreateEnemyItemFallback()
    {
        var item = new VisualElement();
        item.style.flexDirection = FlexDirection.Row;
        item.style.justifyContent = Justify.SpaceBetween;
        item.style.alignItems = Align.Center;
        item.style.marginBottom = 8;
        item.style.paddingTop = 8;
        item.style.paddingBottom = 8;
        item.style.paddingLeft = 10;
        item.style.paddingRight = 10;
        item.style.backgroundColor = new Color(0.2f, 0.2f, 0.25f, 0.6f);
        item.style.borderTopLeftRadius = 4;
        item.style.borderTopRightRadius = 4;
        item.style.borderBottomLeftRadius = 4;
        item.style.borderBottomRightRadius = 4;

        var infoContainer = new VisualElement();
        infoContainer.name = "enemy-info";
        infoContainer.style.flexDirection = FlexDirection.Column;
        infoContainer.style.flexGrow = 1;

        var nameLabel = new Label();
        nameLabel.name = "enemy-name";
        nameLabel.style.fontSize = 16;
        nameLabel.style.color = new Color(1f, 0.9f, 0.7f, 1f);

        var statsLabel = new Label();
        statsLabel.name = "enemy-stats";
        statsLabel.style.fontSize = 12;
        statsLabel.style.color = new Color(0.8f, 0.8f, 0.8f, 1f);

        var weaponLabel = new Label();
        weaponLabel.name = "enemy-weapon";
        weaponLabel.style.fontSize = 11;
        weaponLabel.style.color = new Color(0.7f, 0.7f, 1f, 1f);

        var threatIndicator = new VisualElement();
        threatIndicator.name = "threat-indicator";
        threatIndicator.style.width = 60;
        threatIndicator.style.height = 20;
        threatIndicator.style.borderTopLeftRadius = 10;
        threatIndicator.style.borderTopRightRadius = 10;
        threatIndicator.style.borderBottomLeftRadius = 10;
        threatIndicator.style.borderBottomRightRadius = 10;
        threatIndicator.style.justifyContent = Justify.Center;
        threatIndicator.style.alignItems = Align.Center;
        threatIndicator.style.backgroundColor = new Color(0.3f, 0.8f, 0.3f, 1f);

        var threatLabel = new Label();
        threatLabel.name = "threat-label";
        threatLabel.style.fontSize = 11;
        threatLabel.style.color = Color.white;

        threatIndicator.Add(threatLabel);
        infoContainer.Add(nameLabel);
        infoContainer.Add(statsLabel);
        infoContainer.Add(weaponLabel);
        item.Add(infoContainer);
        item.Add(threatIndicator);

        return item;
    }

    void ShowPopup()
    {
        if (popupContainer != null)
        {
            if (debugMode) Debug.Log($"🎭 ShowPopup: Setting display to Flex, current display: {popupContainer.style.display}");
            popupContainer.style.display = DisplayStyle.Flex;

            // Add animation classes
            popupContainer.RemoveFromClassList("popup-hidden");
            popupContainer.RemoveFromClassList("popup-exit");
            popupContainer.AddToClassList("popup-enter");

            // Check if UI Document is active and panel settings are configured
            if (uiDocument != null && uiDocument.panelSettings != null)
            {
                if (debugMode) Debug.Log($"✅ UIDocument active: {uiDocument.enabled}, Panel Settings: {uiDocument.panelSettings.name}");
            }
            else
            {
                Debug.LogError("❌ UIDocument or Panel Settings not configured properly!");
            }

            Debug.Log("✅ Combat popup displayed");
        }
        else
        {
            Debug.LogError("❌ Cannot show popup - popupContainer is null!");
        }
    }
    public void HidePopup()
    {
        if (popupContainer != null)
        {
            // Add exit animation
            popupContainer.RemoveFromClassList("popup-enter");
            popupContainer.AddToClassList("popup-exit");

            // Hide after animation
            this.ExecuteAfterDelay(() =>
            {
                popupContainer.style.display = DisplayStyle.None;
                popupContainer.AddToClassList("popup-hidden");
            }, animationDuration);

            isPopupActive = false;
            if (debugMode) Debug.Log("✅ Combat popup hidden");
        }
    }

    void OnBackgroundClick(ClickEvent evt)
    {
        // Block the click event from reaching elements below
        evt.StopPropagation();

        // Optionally allow closing popup by clicking background
        // Uncomment if you want this behavior:
        // OnRunAwayClicked();
    }

    void OnBackgroundMouseDown(MouseDownEvent evt)
    {
        // Block mouse down events from reaching the map below
        evt.StopPropagation();
    }

    void OnBackgroundMouseUp(MouseUpEvent evt)
    {
        // Block mouse up events from reaching the map below
        evt.StopPropagation();
    }

    void OnBackgroundMouseMove(MouseMoveEvent evt)
    {
        // Block mouse move events from reaching the map below
        evt.StopPropagation();
    }

    void OnBackgroundWheelEvent(WheelEvent evt)
    {
        // Block wheel/scroll events from reaching the map below
        evt.StopPropagation();
    }

    void OnAttackClicked()
    {
        Debug.Log("🗡️ Player chose to ATTACK!");
        HidePopup();
        OnCombatDecision?.Invoke(true);
    }

    void OnRunAwayClicked()
    {
        Debug.Log("🏃 Player chose to RUN AWAY!");
        HidePopup();
        OnCombatDecision?.Invoke(false);
    }

    /// <summary>
    /// IClickBlocker implementation: Check if this UI should block clicks at the given position
    /// </summary>
    public bool IsBlockingClick(Vector2 screenPosition)
    {
        if (!isPopupActive || popupContainer == null || uiDocument == null)
        {
            return false;
        }

        // Convert screen position to panel-relative position
        Vector2 panelPosition = RuntimePanelUtils.ScreenToPanel(uiDocument.rootVisualElement.panel, screenPosition);

        // Check if the position is within the popup container bounds
        bool withinBounds = popupContainer.worldBound.Contains(panelPosition);

        return withinBounds;
    }

    /// <summary>
    /// Legacy method for backward compatibility - now delegates to IsBlockingClick
    /// Check if a screen position is within the UI bounds to block map interaction
    /// </summary>
    public bool IsPointWithinUI(Vector2 screenPosition)
    {
        return IsBlockingClick(screenPosition);
    }

    /// <summary>
    /// Public getters for external access
    /// </summary>
    public bool IsVisible => isPopupActive;
}

/// <summary>
/// Extension method for delayed execution
/// </summary>
public static class MonoBehaviourExtensions
{
    public static void ExecuteAfterDelay(this MonoBehaviour mono, System.Action action, float delay)
    {
        mono.StartCoroutine(ExecuteAfterDelayCoroutine(action, delay));
    }

    private static System.Collections.IEnumerator ExecuteAfterDelayCoroutine(System.Action action, float delay)
    {
        yield return new WaitForSeconds(delay);
        action?.Invoke();
    }
}