using UnityEngine;
using UnityEngine.UIElements;
using System.Reflection;

public class MapSceneLegendUI : MonoBehaviour, IClickBlocker
{
    [Header("UI References")]
    public UIDocument uiDocument;

    [Header("Settings")]
    public bool startVisible = true;
    public KeyCode toggleKey = KeyCode.L;
    public bool debugMode = true;

    // UI Elements
    private VisualElement legendContainer;
    private Button toggleButton;
    private VisualElement legendContent;
    private VisualElement nameToggleSection;

    // Name toggle buttons
    private Toggle settlementNamesToggle;
    private Toggle forestNamesToggle;
    private Toggle lakeNamesToggle;
    private Toggle plainNamesToggle;
    private Toggle mountainNamesToggle;
    private Toggle riverNamesToggle;

    // References
    private MapLocationNameDisplay nameDisplay;
    private bool isLegendVisible;

    // Helper method to call methods on WorldSpaceLocationNames using reflection
    private void TryCallWorldSpaceMethod(string methodName, bool parameter)
    {
        var allMonoBehaviours = FindObjectsByType<MonoBehaviour>(FindObjectsSortMode.None);
        foreach (var mb in allMonoBehaviours)
        {
            if (mb.GetType().Name == "WorldSpaceLocationNames")
            {
                var method = mb.GetType().GetMethod(methodName);
                if (method != null)
                {
                    method.Invoke(mb, new object[] { parameter });
                    break;
                }
            }
        }
    }

    private void Awake()
    {
        if (uiDocument == null)
            uiDocument = GetComponent<UIDocument>();
    }

    private void Start()
    {
        nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();

        if (debugMode)
        {
            Debug.Log($"MapSceneLegendUI: Starting setup. UIDocument: {(uiDocument != null ? "Found" : "NULL")}");
            Debug.Log($"MapSceneLegendUI: NameDisplay: {(nameDisplay != null ? "Found" : "NULL")}");
            Debug.Log($"MapSceneLegendUI: Root Visual Element: {(uiDocument?.rootVisualElement != null ? "Found" : "NULL")}");
        }

        SetupUI();
        SetLegendVisible(startVisible);

        if (debugMode)
        {
            Debug.Log($"MapSceneLegendUI: Setup complete. Legend visible: {isLegendVisible}");
            Debug.Log($"MapSceneLegendUI: Legend container: {(legendContainer != null ? "Found" : "NULL")}");
        }

        // Register with ClickManager
        if (ClickManager.Instance != null)
        {
            ClickManager.Instance.RegisterClickBlocker(this);
            if (debugMode) Debug.Log("MapSceneLegendUI: Registered with ClickManager");
        }
        else if (debugMode)
        {
            Debug.LogWarning("MapSceneLegendUI: ClickManager not found");
        }
    }

    private void OnDestroy()
    {
        // Unregister from ClickManager
        if (ClickManager.Instance != null)
        {
            ClickManager.Instance.UnregisterClickBlocker(this);
        }
    }

    private void Update()
    {
        if (Input.GetKeyDown(toggleKey))
        {
            ToggleLegend();
        }
    }

    private void SetupUI()
    {
        if (uiDocument == null)
        {
            if (debugMode) Debug.LogError("MapSceneLegendUI: UIDocument is null! Cannot setup UI.");
            return;
        }

        var root = uiDocument.rootVisualElement;
        if (root == null)
        {
            if (debugMode) Debug.LogError("MapSceneLegendUI: Root visual element is null!");
            return;
        }

        if (debugMode) Debug.Log("MapSceneLegendUI: Setting up UI...");

        // Try to find existing legend container from UXML first
        legendContainer = root.Q<VisualElement>("map-legend-container");

        if (legendContainer != null)
        {
            // UXML is loaded, use existing structure
            if (debugMode) Debug.Log("MapSceneLegendUI: Using UXML structure");
            legendContent = legendContainer;

            // Find the name toggle section
            nameToggleSection = root.Q<VisualElement>("name-toggle-section");
            if (nameToggleSection == null)
            {
                // Create it if not found
                nameToggleSection = new VisualElement();
                nameToggleSection.name = "name-toggle-section";
                nameToggleSection.AddToClassList("legend-section");
                var sectionTitle = new Label("Location Names");
                sectionTitle.AddToClassList("legend-section-title");
                nameToggleSection.Add(sectionTitle);
                legendContainer.Add(nameToggleSection);
            }

            // Create name toggles
            CreateNameTogglesSection();
        }
        else
        {
            // Fallback to programmatic creation
            if (debugMode) Debug.Log("MapSceneLegendUI: Using programmatic UI creation");

            // Create main legend container
            legendContainer = new VisualElement();
            legendContainer.name = "map-legend-container";
            legendContainer.AddToClassList("map-legend");

            // Create toggle button
            toggleButton = new Button(() => ToggleLegend());
            toggleButton.text = "Map Legend";
            toggleButton.name = "legend-toggle-button";
            toggleButton.AddToClassList("legend-toggle-btn");

            // Create legend content
            legendContent = new VisualElement();
            legendContent.name = "legend-content";
            legendContent.AddToClassList("legend-content");

            // Add title
            var title = new Label("Map Legend");
            title.AddToClassList("legend-title");
            legendContent.Add(title);

            // Create terrain legend section
            CreateTerrainLegend();

            // Create name toggles section
            CreateNameTogglesSection();

            // Create controls info
            CreateControlsInfo();

            // Assemble the UI
            legendContainer.Add(toggleButton);
            legendContainer.Add(legendContent);

            root.Add(legendContainer);
        }

        // Apply styles
        ApplyStyles();

        if (debugMode) Debug.Log("MapSceneLegendUI: UI setup complete");
    }

    private void CreateTerrainLegend()
    {
        var terrainSection = new VisualElement();
        terrainSection.AddToClassList("legend-section");

        var terrainTitle = new Label("Terrain");
        terrainTitle.AddToClassList("legend-section-title");
        terrainSection.Add(terrainTitle);

        // Terrain items
        var terrainItems = new[]
        {
            ("Ocean", "ocean-color"),
            ("Rivers / Lakes", "river-color"),
            ("Plains / Grasslands", "plain-color"),
            ("Forests", "forest-color"),
            ("Mountains", "mountain-color"),
            ("Towns / Cities", "town-color"),
            ("Villages", "village-color"),
            ("Roads", "road-color")
        };

        foreach (var (label, colorClass) in terrainItems)
        {
            var item = CreateLegendItem(label, colorClass);
            terrainSection.Add(item);
        }

        legendContent.Add(terrainSection);
    }

    private void CreateNameTogglesSection()
    {
        nameToggleSection = new VisualElement();
        nameToggleSection.AddToClassList("legend-section");

        var nameTitle = new Label("Location Names");
        nameTitle.AddToClassList("legend-section-title");
        nameToggleSection.Add(nameTitle);

        // Create toggle switches for each name type
        settlementNamesToggle = CreateNameToggle("Settlements", true, (show) =>
        {
            // Try both old and new name display systems
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.ToggleSettlementNames(show);

            // Also try to find WorldSpaceLocationNames component using reflection
            TryCallWorldSpaceMethod("ToggleSettlementNames", show);
        });

        forestNamesToggle = CreateNameToggle("Forests", true, (show) =>
        {
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.ToggleForestNames(show);

            TryCallWorldSpaceMethod("ToggleForestNames", show);
        });

        lakeNamesToggle = CreateNameToggle("Lakes", true, (show) =>
        {
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.ToggleLakeNames(show);

            TryCallWorldSpaceMethod("ToggleLakeNames", show);
        });

        plainNamesToggle = CreateNameToggle("Plains", true, (show) =>
        {
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.TogglePlainNames(show);

            TryCallWorldSpaceMethod("TogglePlainNames", show);
        });

        mountainNamesToggle = CreateNameToggle("Mountains", true, (show) =>
        {
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.ToggleMountainNames(show);

            TryCallWorldSpaceMethod("ToggleMountainNames", show);
        });

        riverNamesToggle = CreateNameToggle("Rivers", true, (show) =>
        {
            if (nameDisplay == null) nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (nameDisplay != null) nameDisplay.ToggleRiverNames(show);

            TryCallWorldSpaceMethod("ToggleRiverNames", show);
        });

        nameToggleSection.Add(settlementNamesToggle);
        nameToggleSection.Add(forestNamesToggle);
        nameToggleSection.Add(lakeNamesToggle);
        nameToggleSection.Add(plainNamesToggle);
        nameToggleSection.Add(mountainNamesToggle);
        nameToggleSection.Add(riverNamesToggle);

        legendContent.Add(nameToggleSection);
    }

    private Toggle CreateNameToggle(string labelText, bool defaultValue, System.Action<bool> onValueChanged)
    {
        var toggle = new Toggle();
        toggle.text = labelText;
        toggle.value = defaultValue;
        toggle.AddToClassList("name-toggle");

        toggle.RegisterValueChangedCallback(evt => onValueChanged(evt.newValue));

        return toggle;
    }

    private void CreateControlsInfo()
    {
        var controlsSection = new VisualElement();
        controlsSection.AddToClassList("legend-section");
        controlsSection.AddToClassList("controls-info");

        var controlsTitle = new Label("Controls");
        controlsTitle.AddToClassList("legend-section-title");
        controlsSection.Add(controlsTitle);

        var controls = new[]
        {
            "WASD / Arrow Keys: Move Camera",
            "Mouse Wheel: Zoom In/Out",
            $"{toggleKey}: Toggle Legend",
            "Click: Select Location",
            "Mouse Hover: Show Details"
        };

        foreach (var controlText in controls)
        {
            var controlLabel = new Label(controlText);
            controlLabel.AddToClassList("controls-text");
            controlsSection.Add(controlLabel);
        }

        legendContent.Add(controlsSection);
    }

    private VisualElement CreateLegendItem(string labelText, string colorClass)
    {
        var item = new VisualElement();
        item.AddToClassList("legend-item");

        var colorBox = new VisualElement();
        colorBox.AddToClassList("color-box");
        colorBox.AddToClassList(colorClass);

        var label = new Label(labelText);
        label.AddToClassList("legend-text");

        item.Add(colorBox);
        item.Add(label);

        return item;
    }

    private void ApplyStyles()
    {
        var styleSheet = Resources.Load<StyleSheet>("UI/MapLegend");
        if (styleSheet != null)
        {
            uiDocument.rootVisualElement.styleSheets.Add(styleSheet);
        }
        else
        {
            // Apply inline styles if stylesheet not found
            ApplyInlineStyles();
        }
    }

    private void ApplyInlineStyles()
    {
        // Legend container positioning
        legendContainer.style.position = Position.Absolute;
        legendContainer.style.top = 20;
        legendContainer.style.left = 20;
        legendContainer.style.width = 250;

        // Toggle button
        toggleButton.style.backgroundColor = new Color(0.2f, 0.2f, 0.2f, 0.9f);
        toggleButton.style.color = Color.white;
        toggleButton.style.borderTopLeftRadius = 5;
        toggleButton.style.borderTopRightRadius = 5;
        toggleButton.style.borderBottomLeftRadius = 0;
        toggleButton.style.borderBottomRightRadius = 0;
        toggleButton.style.paddingTop = 8;
        toggleButton.style.paddingBottom = 8;
        toggleButton.style.paddingLeft = 12;
        toggleButton.style.paddingRight = 12;

        // Legend content
        legendContent.style.backgroundColor = new Color(0.1f, 0.1f, 0.1f, 0.9f);
        legendContent.style.borderBottomLeftRadius = 5;
        legendContent.style.borderBottomRightRadius = 5;
        legendContent.style.borderTopWidth = 1;
        legendContent.style.borderTopColor = new Color(0.4f, 0.4f, 0.4f, 0.8f);
        legendContent.style.paddingTop = 10;
        legendContent.style.paddingBottom = 10;
        legendContent.style.paddingLeft = 12;
        legendContent.style.paddingRight = 12;

        // Apply basic color classes
        ApplyTerrainColors();
    }

    private void ApplyTerrainColors()
    {
        // This would ideally be done via USS, but for now we'll handle it in the legend creation
        // The actual color styling should be handled by the MapLegend.uss file
    }

    public void ToggleLegend()
    {
        if (debugMode) Debug.Log($"MapSceneLegendUI: Toggling legend. Current state: {isLegendVisible}");
        SetLegendVisible(!isLegendVisible);
    }

    public void SetLegendVisible(bool visible)
    {
        isLegendVisible = visible;
        if (legendContent != null)
        {
            legendContent.style.display = visible ? DisplayStyle.Flex : DisplayStyle.None;
            if (debugMode) Debug.Log($"MapSceneLegendUI: Set legend visible: {visible}");
        }
        else if (debugMode)
        {
            Debug.LogWarning("MapSceneLegendUI: Cannot set visibility - legendContent is null");
        }

        if (toggleButton != null)
        {
            toggleButton.text = visible ? "Hide Legend" : "Map Legend";
        }
    }

    public void OnFeaturesGenerated()
    {
        // Refresh the toggle states to match the current display settings
        if (nameDisplay != null)
        {
            settlementNamesToggle?.SetValueWithoutNotify(nameDisplay.showSettlementNames);
            forestNamesToggle?.SetValueWithoutNotify(nameDisplay.showForestNames);
            lakeNamesToggle?.SetValueWithoutNotify(nameDisplay.showLakeNames);
            plainNamesToggle?.SetValueWithoutNotify(nameDisplay.showPlainNames);
            mountainNamesToggle?.SetValueWithoutNotify(nameDisplay.showMountainNames);
            riverNamesToggle?.SetValueWithoutNotify(nameDisplay.showRiverNames);
        }
    }

    // IClickBlocker implementation
    public bool IsBlockingClick(Vector2 screenPosition)
    {
        if (!isLegendVisible || legendContainer == null)
            return false;

        // Convert screen position to UI coordinates and check if it's within the legend bounds
        var panelGeometry = legendContainer.worldBound;
        return panelGeometry.Contains(screenPosition);
    }

    [ContextMenu("Toggle Legend")]
    public void ToggleLegendManual()
    {
        ToggleLegend();
    }

    [ContextMenu("Show Legend")]
    public void ShowLegend()
    {
        SetLegendVisible(true);
    }

    [ContextMenu("Hide Legend")]
    public void HideLegend()
    {
        SetLegendVisible(false);
    }

    [ContextMenu("Debug Legend")]
    public void RefreshNameDisplayConnection()
    {
        // Try to find the name display if it wasn't found initially
        if (nameDisplay == null)
        {
            nameDisplay = FindFirstObjectByType<MapLocationNameDisplay>();
            if (debugMode && nameDisplay != null)
            {
                Debug.Log("MapSceneLegendUI: Successfully connected to MapLocationNameDisplay");
            }
        }
    }

    public void DebugLegend()
    {
        Debug.Log($"=== MapSceneLegendUI Debug Info ===");
        Debug.Log($"UIDocument: {(uiDocument != null ? "Found" : "NULL")}");
        Debug.Log($"LegendContainer: {(legendContainer != null ? "Found" : "NULL")}");
        Debug.Log($"LegendContent: {(legendContent != null ? "Found" : "NULL")}");
        Debug.Log($"IsLegendVisible: {isLegendVisible}");
        Debug.Log($"NameDisplay: {(nameDisplay != null ? "Found" : "NULL")}");

        if (uiDocument?.rootVisualElement != null)
        {
            Debug.Log($"Root element children: {uiDocument.rootVisualElement.childCount}");
        }
    }
}