using UnityEngine;

/// <summary>
/// Handles applying upgrades to ball effect definitions.
/// Creates modified copies of definitions with upgrade values applied.
/// </summary>
public static class UpgradeManager
{
    /// <summary>
    /// Apply current upgrades to a definition and return a modified version.
    /// Creates a temporary modified definition without altering the original asset.
    /// </summary>
    public static BallEffectDefinition ApplyUpgrades(BallEffectDefinition definition, UpgradeState upgrades)
    {
        if (definition == null || upgrades == null)
            return definition;

        // Create a modified copy based on the effect type
        switch (definition.EffectType)
        {
            case BallEffectType.Explosive:
                return ApplyExplosiveUpgrades(definition as ExplosiveHitEffectDefinition, upgrades);

            case BallEffectType.TripleSplit:
                return ApplySplitUpgrades(definition as TripleSplitEffectDefinition, upgrades);

            case BallEffectType.Piercing:
                return ApplyPiercingUpgrades(definition as PiercingEffectDefinition, upgrades);

            case BallEffectType.Homing:
                return ApplyHomingUpgrades(definition as HomingEffectDefinition, upgrades);

            case BallEffectType.Teleport:
                return ApplyTeleportUpgrades(definition as TeleportEffectDefinition, upgrades);

            default:
                return definition;
        }
    }

    private static BallEffectDefinition ApplyExplosiveUpgrades(
        ExplosiveHitEffectDefinition original, UpgradeState upgrades)
    {
        if (original == null)
            return null;

        // Create a runtime copy
        ExplosiveHitEffectDefinition upgraded = ScriptableObject.CreateInstance<ExplosiveHitEffectDefinition>();
        upgraded.name = original.name + " (Upgraded)";
        upgraded.CopyBaseFrom(original);

        // Apply upgrades
        upgraded.SetRadius(original.Radius + upgrades.ExplosiveRadiusBonus);
        upgraded.SetMaxDamageAtCenter(original.MaxDamageAtCenter * upgrades.ExplosiveDamageMultiplier);
        upgraded.SetMinDamageAtEdge(original.MinDamageAtEdge * upgrades.ExplosiveDamageMultiplier);

        return upgraded;
    }

    private static BallEffectDefinition ApplySplitUpgrades(
        TripleSplitEffectDefinition original, UpgradeState upgrades)
    {
        if (original == null)
            return null;

        TripleSplitEffectDefinition upgraded = ScriptableObject.CreateInstance<TripleSplitEffectDefinition>();
        upgraded.name = original.name + " (Upgraded)";
        upgraded.CopyBaseFrom(original);

        upgraded.SetSplitOnlyOnce(original.SplitOnlyOnce);
        upgraded.SetSplitAngle(original.SplitAngle + upgrades.SplitAngleBonus);
        upgraded.SetChildScaleMultiplier(original.ChildScaleMultiplier);
        upgraded.SetChildSpeedMultiplier(original.ChildSpeedMultiplier * upgrades.SplitSpeedMultiplier);
        upgraded.SetChildDamageMultiplier(original.ChildDamageMultiplier * upgrades.SplitDamageMultiplier);

        return upgraded;
    }

    private static BallEffectDefinition ApplyPiercingUpgrades(
        PiercingEffectDefinition original, UpgradeState upgrades)
    {
        if (original == null)
            return null;

        PiercingEffectDefinition upgraded = ScriptableObject.CreateInstance<PiercingEffectDefinition>();
        upgraded.name = original.name + " (Upgraded)";
        upgraded.CopyBaseFrom(original);

        upgraded.SetPierceHits(original.PierceHits + upgrades.PiercingHitsBonus);

        return upgraded;
    }

    private static BallEffectDefinition ApplyHomingUpgrades(
        HomingEffectDefinition original, UpgradeState upgrades)
    {
        if (original == null)
            return null;

        HomingEffectDefinition upgraded = ScriptableObject.CreateInstance<HomingEffectDefinition>();
        upgraded.name = original.name + " (Upgraded)";
        upgraded.CopyBaseFrom(original);

        upgraded.SetTurnRateDegreesPerSecond(original.TurnRateDegreesPerSecond * upgrades.HomingTurnRateMultiplier);
        upgraded.SetRetargetInterval(original.RetargetInterval);

        return upgraded;
    }

    private static BallEffectDefinition ApplyTeleportUpgrades(
        TeleportEffectDefinition original, UpgradeState upgrades)
    {
        if (original == null)
            return null;

        TeleportEffectDefinition upgraded = ScriptableObject.CreateInstance<TeleportEffectDefinition>();
        upgraded.name = original.name + " (Upgraded)";
        upgraded.CopyBaseFrom(original);

        upgraded.SetIntervalSeconds(original.IntervalSeconds);
        upgraded.SetTeleportDistance(original.TeleportDistance * upgrades.TeleportDistanceMultiplier);
        upgraded.SetOverlapCheckRadius(original.OverlapCheckRadius);

        return upgraded;
    }
}