using UnityEngine;
using UnityEngine.UIElements;

/// <summary>
/// Displays agent information in a popup panel using UI Toolkit
/// Singleton pattern to ensure only one panel is shown at a time
/// </summary>
public class AgentInfoPanel : MonoBehaviour
{
    private static AgentInfoPanel instance;
    private static UIDocument uiDocument;
    private static VisualElement panelRoot;
    private static AIAgent currentAgent;

    void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }

        instance = this;
        uiDocument = GetComponent<UIDocument>();

        if (uiDocument == null)
        {
            Debug.LogError("AgentInfoPanel: UIDocument component not found!");
            return;
        }
    }

    void OnEnable()
    {
        if (uiDocument == null) return;

        panelRoot = uiDocument.rootVisualElement.Q<VisualElement>("AgentInfoPanelRoot");
        if (panelRoot == null)
        {
            Debug.LogError("AgentInfoPanel: AgentInfoPanelRoot not found in UXML!");
            return;
        }

        // Hide panel initially
        panelRoot.style.display = DisplayStyle.None;

        // Setup close button
        var closeButton = panelRoot.Q<Button>("CloseButton");
        if (closeButton != null)
        {
            closeButton.clicked += HidePanel;
        }
    }

    /// <summary>
    /// Shows agent information in the info panel
    /// </summary>
    public static void ShowAgentInfo(AIAgent agent)
    {
        if (instance == null)
        {
            Debug.LogWarning("AgentInfoPanel: Instance not found!");
            return;
        }

        if (agent == null) return;

        currentAgent = agent;
        instance.DisplayAgentInfo(agent);
    }

    /// <summary>
    /// Displays the agent info in the UI
    /// </summary>
    private void DisplayAgentInfo(AIAgent agent)
    {
        if (panelRoot == null) return;

        // Show panel
        panelRoot.style.display = DisplayStyle.Flex;

        // Set agent name
        var nameLabel = panelRoot.Q<Label>("AgentNameLabel");
        if (nameLabel != null)
        {
            nameLabel.text = agent.AgentName;
        }

        // Set stats
        var stats = agent.Stats;
        if (stats != null)
        {
            UpdateStatDisplay("StrengthBar", "StrengthValue", stats.Strength);
            UpdateStatDisplay("SpeedBar", "SpeedValue", stats.Speed);
            UpdateStatDisplay("MagicBar", "MagicValue", stats.Magic);
            UpdateStatDisplay("DexterityBar", "DexterityValue", stats.Dexterity);

            var totalLabel = panelRoot.Q<Label>("TotalStatsValue");
            if (totalLabel != null)
            {
                totalLabel.text = stats.GetTotalStats().ToString();
            }
        }

        // Set status
        var statusLabel = panelRoot.Q<Label>("StatusLabel");
        if (statusLabel != null)
        {
            if (agent.HasReachedGoal)
            {
                statusLabel.text = "✓ Reached Exit";
            }
            else
            {
                statusLabel.text = "Exploring maze...";
            }
        }

        Debug.Log($"Displaying info for: {agent.AgentName}");
    }

    /// <summary>
    /// Updates a stat display (progress bar and label)
    /// </summary>
    private void UpdateStatDisplay(string barName, string labelName, int value)
    {
        var bar = panelRoot.Q<ProgressBar>(barName);
        if (bar != null)
        {
            bar.value = value;
            bar.highValue = 100;
        }

        var label = panelRoot.Q<Label>(labelName);
        if (label != null)
        {
            label.text = value.ToString();
        }
    }

    /// <summary>
    /// Hides the info panel
    /// </summary>
    private static void HidePanel()
    {
        if (panelRoot != null)
        {
            panelRoot.style.display = DisplayStyle.None;
            currentAgent = null;
        }
    }

    /// <summary>
    /// Hides panel when clicking outside of it
    /// </summary>
    void Update()
    {
        if (panelRoot == null || panelRoot.style.display == DisplayStyle.None) return;

        if (Input.GetMouseButtonDown(0))
        {
            // Check if click is outside the panel
            var clickPos = Input.mousePosition;
            var panelWorldRect = panelRoot.worldBound;

            if (!panelWorldRect.Contains(new Vector2(clickPos.x, Screen.height - clickPos.y)))
            {
                HidePanel();
            }
        }
    }
}