using System.Text;
using UnityEngine;
using UnityEngine.UI;

public class TalentTooltipUI : MonoBehaviour
{
    public RectTransform panelRoot;
    public CanvasGroup canvasGroup;
    public Text titleText;
    public Text descriptionText;
    public Text costText;
    public Text modifiersText;
    public Text requirementsText;
    public Text statusText;
    public Text reasonText;
    public Vector2 screenOffset = new Vector2(22f, -18f);

    private bool visible;

    private void Awake()
    {
        if (panelRoot == null)
        {
            panelRoot = transform as RectTransform;
        }

        if (canvasGroup == null)
        {
            canvasGroup = GetComponent<CanvasGroup>();
        }

        Hide();
    }

    private void Update()
    {
        if (!visible || panelRoot == null)
        {
            return;
        }

        panelRoot.position = Input.mousePosition + new Vector3(screenOffset.x, screenOffset.y, 0f);
    }

    public void Show(TalentData talent, TalentManager manager)
    {
        if (talent == null)
        {
            return;
        }

        if (titleText != null)
        {
            titleText.text = talent.displayName;
        }

        if (descriptionText != null)
        {
            descriptionText.text = talent.description;
        }

        if (costText != null)
        {
            costText.text = $"Стоимость: {talent.cost}";
        }

        if (modifiersText != null)
        {
            modifiersText.text = BuildModifiersText(talent);
        }

        if (requirementsText != null)
        {
            requirementsText.text = BuildRequirementsText(talent);
        }

        if (statusText != null)
        {
            statusText.text = $"Статус: {BuildStatusText(talent, manager)}";
        }

        if (reasonText != null)
        {
            reasonText.text = manager != null ? manager.GetBlockingReason(talent) : string.Empty;
        }

        visible = true;
        if (canvasGroup != null)
        {
            canvasGroup.alpha = 1f;
            canvasGroup.blocksRaycasts = false;
        }

        if (panelRoot != null)
        {
            panelRoot.gameObject.SetActive(true);
            panelRoot.SetAsLastSibling();
        }
    }

    public void Hide()
    {
        visible = false;
        if (canvasGroup != null)
        {
            canvasGroup.alpha = 0f;
            canvasGroup.blocksRaycasts = false;
        }

        if (panelRoot != null)
        {
            panelRoot.gameObject.SetActive(false);
        }
    }

    private string BuildModifiersText(TalentData talent)
    {
        if (talent.modifiers == null || talent.modifiers.Length == 0)
        {
            return "Модификаторы: нет";
        }

        StringBuilder builder = new StringBuilder();
        builder.AppendLine("Модификаторы:");
        for (int i = 0; i < talent.modifiers.Length; i++)
        {
            builder.AppendLine(FormatModifier(talent.modifiers[i]));
        }

        return builder.ToString().TrimEnd();
    }

    private string BuildRequirementsText(TalentData talent)
    {
        if (talent.prerequisites == null || talent.prerequisites.Length == 0)
        {
            return "Требования: нет";
        }

        StringBuilder builder = new StringBuilder("Требования: ");
        for (int i = 0; i < talent.prerequisites.Length; i++)
        {
            if (i > 0)
            {
                builder.Append(", ");
            }

            TalentData prerequisite = talent.prerequisites[i];
            builder.Append(prerequisite != null ? prerequisite.displayName : "Missing");
        }

        return builder.ToString();
    }

    private string BuildStatusText(TalentData talent, TalentManager manager)
    {
        if (manager == null)
        {
            return "неизвестно";
        }

        if (manager.IsLearned(talent))
        {
            return "изучено";
        }

        if (manager.CanLearn(talent))
        {
            return "доступно";
        }

        if (!manager.ArePrerequisitesLearned(talent))
        {
            return "заблокировано";
        }

        return "не хватает очков";
    }

    private string FormatModifier(StatModifier modifier)
    {
        string statName = FormatStatName(modifier.statType);
        string valueText;

        if (modifier.modifierType == ModifierType.PercentAdd || modifier.modifierType == ModifierType.PercentMultiply)
        {
            valueText = FormatSignedNumber(modifier.value * 100f) + "%";
        }
        else if (modifier.statType == StatType.AbilityCooldownReduction || modifier.statType == StatType.CriticalChance)
        {
            valueText = FormatSignedNumber(modifier.value) + "%";
        }
        else
        {
            valueText = FormatSignedNumber(modifier.value);
        }

        return $"{statName} {valueText}";
    }

    private string FormatStatName(StatType statType)
    {
        switch (statType)
        {
            case StatType.MaxHealth:
                return "Max Health";
            case StatType.MaxMana:
                return "Max Mana";
            case StatType.Damage:
                return "Damage";
            case StatType.MoveSpeed:
                return "Move Speed";
            case StatType.AbilityCooldownReduction:
                return "Cooldown Reduction";
            case StatType.CriticalChance:
                return "Critical Chance";
            default:
                return statType.ToString();
        }
    }

    private string FormatSignedNumber(float value)
    {
        string sign = value >= 0f ? "+" : string.Empty;
        return sign + value.ToString("0.##");
    }
}