// ============================================================================
// 2. ABILITY MODIFIER SYSTEM - Enhanced with Source Tracking
// ============================================================================

using UnityEngine;

[System.Serializable]
public class AbilityModifier
{
    [Header("Resource Cost Modifiers")]
    public float manaCostMultiplier = 1f;
    public float manaCostFlat = 0f;
    public float healthCostMultiplier = 1f;
    public float healthCostFlat = 0f;
    public float classResourceCostMultiplier = 1f;
    public float classResourceCostFlat = 0f;

    [Header("Timing Modifiers")]
    public float castTimeMultiplier = 1f;
    public float cooldownMultiplier = 1f;

    [Header("Effect Modifiers")]
    public float damageMultiplier = 1f;
    public float healingMultiplier = 1f;
    public float durationMultiplier = 1f;
    public float rangeMultiplier = 1f;

    [Header("Meta Info")]
    public string modifierName = "Unnamed Modifier";
    public string description = "";
    public float duration = -1f; // -1 = permanent

    // Source tracking - matches StatModifier pattern
    public readonly object Source;

    // ========================================================================
    // CONSTRUCTORS - Multiple overloads like StatModifier
    // ========================================================================

    // Default constructor (for serialization)
    public AbilityModifier()
    {
        Source = null;
    }

    // Constructor with source
    public AbilityModifier(object source)
    {
        Source = source;
    }

    // Copy constructor with new source
    public AbilityModifier(AbilityModifier original, object newSource)
    {
        // Copy all values
        manaCostMultiplier = original.manaCostMultiplier;
        manaCostFlat = original.manaCostFlat;
        healthCostMultiplier = original.healthCostMultiplier;
        healthCostFlat = original.healthCostFlat;
        classResourceCostMultiplier = original.classResourceCostMultiplier;
        classResourceCostFlat = original.classResourceCostFlat;

        castTimeMultiplier = original.castTimeMultiplier;
        cooldownMultiplier = original.cooldownMultiplier;

        damageMultiplier = original.damageMultiplier;
        healingMultiplier = original.healingMultiplier;
        durationMultiplier = original.durationMultiplier;
        rangeMultiplier = original.rangeMultiplier;

        modifierName = original.modifierName;
        description = original.description;
        duration = original.duration;

        // Set new source
        Source = newSource;
    }

    // ========================================================================
    // FACTORY METHODS - Enhanced with source support
    // ========================================================================

    public static AbilityModifier CreateDamageBoost(float multiplier, string name = "Damage Boost", object source = null)
    {
        var modifier = new AbilityModifier(source)
        {
            damageMultiplier = multiplier,
            modifierName = name
        };
        return modifier;
    }

    public static AbilityModifier CreateCooldownReduction(float reductionPercent, string name = "Cooldown Reduction", object source = null)
    {
        var modifier = new AbilityModifier(source)
        {
            cooldownMultiplier = 1f - (reductionPercent / 100f),
            modifierName = name
        };
        return modifier;
    }

    public static AbilityModifier CreateManaCostReduction(float reductionPercent, string name = "Mana Cost Reduction", object source = null)
    {
        var modifier = new AbilityModifier(source)
        {
            manaCostMultiplier = 1f - (reductionPercent / 100f),
            modifierName = name
        };
        return modifier;
    }

    public static AbilityModifier CreateCastTimeReduction(float reductionPercent, string name = "Cast Time Reduction", object source = null)
    {
        var modifier = new AbilityModifier(source)
        {
            castTimeMultiplier = 1f - (reductionPercent / 100f),
            modifierName = name
        };
        return modifier;
    }

    public static AbilityModifier CreateHealingBoost(float multiplier, string name = "Healing Boost", object source = null)
    {
        var modifier = new AbilityModifier(source)
        {
            healingMultiplier = multiplier,
            modifierName = name
        };
        return modifier;
    }

    // ========================================================================
    // UTILITY METHODS
    // ========================================================================

    public bool HasSource(object source)
    {
        return Source != null && Source.Equals(source);
    }

    public override string ToString()
    {
        string sourceStr = Source?.ToString() ?? "No Source";
        return $"{modifierName} (Source: {sourceStr})";
    }
}