# Subtask 18 Context: Enchantment Power Effect + Audit Stubs

## Current Enchantment Power Effect Status

### Definition Status
- **"Enchantment Power" is NOT defined as an enchantment effect** in `src/lib/game/data/enchantments/` directory
- The `ENCHANTMENT_EFFECTS` catalog (in `enchantment-effects.ts` and `enchantments/index.ts`) does not contain any effect with "Enchantment Power" as a defined effect
- Searching for "Enchantment Power" in enchantment files returns no results

### How Enchantment Power is Referenced
The `enchantPower` stat IS referenced in **skill upgrade perks** in `src/lib/game/skill-evolution.ts`:

| Perk ID | Name | Effect | Skill Tree |
|---------|------|--------|------------|
| `en_t1_l5_a` | Artisan's Touch | `+10% Enchantment Power` | Enchanting T1 |
| `en_t1_l10_a` | Greater Artisan | `+15% Enchantment Power` | Enchanting T1 |
| `en_t2_l5_a` | Expert Artisan | `+25% Enchantment Power` | Enchanting T2 |
| `en_t2_l10_a` | Master Artisan | `+35% Enchantment Power` | Enchanting T2 |
| `en_t3_l5_a` | Cosmic Artisan | `+50% Enchantment Power` | Enchanting T3 |
| `en_t3_l10_a` | [ELITE] OMNI-ARTISAN | `2x enchantment power` | Enchanting T3 |
| `en_t4_l5_a` | Astral Artisan | `+75% Enchantment Power` | Enchanting T4 |
| `en_t4_l10_a` | Galactic Artisan | `+100% Enchantment Power` | Enchanting T4 |
| `en_t5_l5_a` | Divine Artisan | `+150% Enchantment Power` | Enchanting T5 |
| `en_t5_l10_a` | [ELITE] ASCENDED ARTISAN | `5x enchantment power` | Enchanting T5 |
| `es_t1_l5_c` | Quick Work | `+5% Enchantment Power` | Essence Shaping T1 |
| `es_t1_l10_c` | Superior Work | `+10% Enchantment Power` | Essence Shaping T1 |
| `es_t2_l5_c` | Expert Work | `+15% Enchantment Power` | Essence Shaping T2 |
| `es_t2_l10_c` | Master Work | `+20% Enchantment Power` | Essence Shaping T2 |
| `es_t3_l5_c` | Divine Work | `+25% Enchantment Power` | Essence Shaping T3 |
| `es_t3_l10_c` | [ELITE] OMNI-WORK | `2x enchantment power` | Essence Shaping T3 |
| `ee_t1_l5_c` | Quality Work | `+5% Enchantment Power` | Elemental Evocation T1 |
| `ee_t1_l10_c` | Superior Work | `+10% Enchantment Power` | Elemental Evocation T1 |
| `ee_t2_l5_c` | Expert Work | `+15% Enchantment Power` | Elemental Evocation T2 |
| `ee_t2_l10_c` | Master Work | `+20% Enchantment Power` | Elemental Evocation T2 |
| `ee_t3_l5_c` | Divine Work | `+25% Enchantment Power` | Elemental Evocation T3 |
| `ee_t3_l10_c` | [ELITE] OMNI-POWER | `2x enchantment power` | Elemental Evocation T3 |

### Effect Type in Skill Evolution
All these perks use the effect structure:
```typescript
{ type: 'multiplier', stat: 'enchantPower', value: <decimal_value> }
```

### Problem: `enchantPower` Stat Not Handled in Effects System
In `src/lib/game/upgrade-effects.ts`, the `computeEffects` function has a switch statement for multiplier effects (lines 295-320) but **does NOT have a case for `enchantPower`**:

```typescript
switch (effect.stat) {
  case 'maxMana':
    effects.maxManaMultiplier *= effect.value;
    break;
  case 'regen':
    effects.regenMultiplier *= effect.value;
    break;
  // ... other cases ...
  // NO CASE FOR 'enchantPower'!
}
```

Similarly, the `ComputedEffects` interface (lines 16-48) does NOT include an `enchantPower` or `enchantmentPowerMultiplier` field.

### StatsTab.tsx Attempts to Read `enchantPower`
In `src/components/game/tabs/StatsTab.tsx` (lines 161-178), there's a placeholder that tries to read `enchantPower`:
```typescript
{upgradeEffects && 'enchantPower' in upgradeEffects 
  ? `${(upgradeEffects as Record<string, number>).enchantPower.toFixed(2)}×` 
  : '1.0×'}
```
This is a type-safe workaround since `enchantPower` is not in the `ComputedEffects` interface.

---

## Stub Location in EquipmentTab

**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/EquipmentTab.tsx`

**Lines 516-531:**
```typescript
{/* Enchantment Power (placeholder for Task 5) */}
<GameCard className="mt-4">
  <div className="pb-2">
    <h3 className="text-sm font-semibold text-[var(--text-primary)] flex items-center gap-2">
      ✨ Enchantment Power
    </h3>
  </div>
  <div>
    <StatRow 
      label="Enchantment Power:"
      value="1.0×"
      highlight="info"
    />
    <p className="text-xs text-[var(--text-muted)] mt-2">
      Increases the power of all enchantments. Will be wired from Task 5 implementation.
    </p>
  </div>
</GameCard>
```

**Exact stub text:** "Increases the power of all enchantments. Will be wired from Task 5 implementation."

**Location:** Line 530 in EquipmentTab.tsx

---

## Other Unwired Stubs

### 1. AttunementsTab.tsx - Disenchanting TODO
**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/AttunementsTab.tsx`
**Line:** 198
**Content:**
```typescript
{cap === 'disenchanting' && '🔄 Disenchant'}  {/* TODO: Remove after bug 13 complete */}
```
**Description:** TODO comment indicating disenchanting cap should be removed after bug 13 is complete.

### 2. AttunementsTab.tsx - Research TODO
**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/AttunementsTab.tsx`
**Line:** 249
**Content:**
```typescript
{cat === 'research' && '🔮 Research'}  {/* TODO: Remove after Bug 12 - research moved to mana */}
```
**Description:** TODO comment indicating research category should be removed after Bug 12 (research moved to mana).

### 3. AttunementsTab.tsx.backup - Disenchanting TODO (backup file)
**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/AttunementsTab.tsx.backup`
**Line:** 198
**Content:**
```typescript
{cap === 'disenchanting' && '🔄 Disenchant'}  // TODO: Remove after bug 13 complete
```
**Description:** Same as #1 but in backup file (can likely be ignored).

### 4. AttunementsTab.tsx.backup - Research TODO (backup file)
**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/AttunementsTab.tsx.backup`
**Line:** 249
**Content:**
```typescript
{cat === 'research' && '🔮 Research'}  // TODO: Remove after Bug 12 - research moved to mana
```
**Description:** Same as #2 but in backup file (can likely be ignored).

### 5. skill-evolution.ts - Attunement Requirement Placeholder
**File:** `/home/user/repos/Mana-Loop/src/lib/game/skill-evolution.ts`
**Line:** 2218
**Content:**
```typescript
// Check attunement requirement (placeholder - would need actual attunement check)
```
**Description:** Placeholder comment indicating attunement requirement check is not implemented.

### 6. StatsTab.tsx - Enchantment Power (Wired but Non-functional)
**File:** `/home/user/repos/Mana-Loop/src/components/game/tabs/StatsTab.tsx`
**Lines:** 161-178
**Content:**
```typescript
{/* Enchantment Power (placeholder for Task 5) */}
<Card className="bg-gray-900/80 border-gray-700">
  <CardHeader className="pb-2">
    <CardTitle className="text-blue-400 game-panel-title text-xs flex items-center gap-2">
      ✨ Enchantment Power
    </CardTitle>
  </CardHeader>
  <CardContent>
    <div className="flex justify-between text-sm">
      <span className="text-gray-400">Enchantment Power:</span>
      <span className="text-blue-300 font-[var(--font-mono)]">
        {upgradeEffects && 'enchantPower' in upgradeEffects 
          ? `${(upgradeEffects as Record<string, number>).enchantPower.toFixed(2)}×` 
          : '1.0×'}
      </span>
    </div>
    <p className="text-xs text-gray-500 mt-2">
      Increases the power of all enchantments. Wired from Task 5 implementation.
    </p>
  </CardContent>
</Card>
```
**Description:** This is labeled "Wired from Task 5 implementation" but the underlying `enchantPower` stat is not actually computed in `upgrade-effects.ts`. The display uses a type cast workaround.

---

## Effects System Overview

### How Effects Are Applied

The effects system is implemented across two main files:

#### 1. `src/lib/game/upgrade-effects.ts` - Skill Upgrade Effects
- **Interface:** `ComputedEffects` (lines 16-48)
- **Function:** `computeEffects()` (lines 260-330)
- Processes skill upgrade effects from `skillUpgrades` and `skillTiers`
- Handles three effect types:
  - `multiplier` - multiplies a stat (e.g., `maxMana`, `regen`, `clickMana`)
  - `bonus` - adds to a stat (e.g., `maxMana`, `regen`, `baseDamage`)
  - `special` - adds a special effect ID to the `specials` set

#### 2. `src/lib/game/effects.ts` - Unified Effects (Skill + Equipment)
- **Function:** `computeEquipmentEffects()` (lines 20-78)
  - Processes equipped item enchantments
  - Returns `bonuses`, `multipliers`, and `specials`
  - For each enchantment:
    - `bonus` type: adds `effect.value * ench.stacks` to `bonuses[effect.stat]`
    - `multiplier` type: multiplies `multipliers[effect.stat]` by `effect.value` for each stack
    - `special` type: adds `effect.specialId` to `specials` set

- **Function:** `computeAllEffects()` (lines 91-137)
  - Merges skill upgrade effects with equipment effects
  - Merging strategy:
    - Bonuses: ADD together
    - Multipliers: MULTIPLY together
    - Specials: UNION of sets

### Where Enchantment Power Multiplier Would Go

The `enchantmentPower` (or `enchantPower`) multiplier should:

1. **Be added to `ComputedEffects` interface** in `upgrade-effects.ts`:
   ```typescript
   enchantmentPowerMultiplier: number; // defaults to 1
   ```

2. **Be handled in `computeEffects()` switch statement** in `upgrade-effects.ts`:
   ```typescript
   case 'enchantPower':
     effects.enchantmentPowerMultiplier *= effect.value;
     break;
   ```

3. **Be applied in `computeEquipmentEffects()` or `computeAllEffects()`** in `effects.ts`:
   - Option A: Apply to `effect.value` when processing each enchantment
   - Option B: Apply as an additional multiplier in `computeAllEffects()`

The most logical place is in `computeEquipmentEffects()` where enchantment values are calculated:
```typescript
// When processing bonus effects:
bonuses[effect.stat] = (bonuses[effect.stat] || 0) + effect.value * ench.stacks * enchantmentPowerMultiplier;

// When processing multiplier effects:
// Each stack applies the multiplier, also modified by enchantmentPowerMultiplier
for (let i = 0; i < ench.stacks; i++) {
  multipliers[key] *= (effect.value - 1) * enchantmentPowerMultiplier + 1;
  // OR simpler: just multiply the final multiplier by enchantmentPowerMultiplier
}
```

### Current Multiplier Application (from effects.ts lines 48-57):
```typescript
} else if (effect.type === 'multiplier' && effect.stat && effect.value) {
  // Multiplier effects multiply together
  const key = effect.stat;
  if (!multipliers[key]) {
    multipliers[key] = 1;
  }
  // Each stack applies the multiplier
  for (let i = 0; i < ench.stacks; i++) {
    multipliers[key] *= effect.value;
  }
}
```

**Note:** The `enchantmentPower` multiplier would need to be passed into `computeEquipmentEffects()` or applied after the fact in `computeAllEffects()`.

---

## Summary of Required Changes for Task 5 (Enchantment Power)

1. Add `enchantmentPowerMultiplier` field to `ComputedEffects` interface
2. Handle `enchantPower` stat in `computeEffects()` switch statement
3. Pass `enchantmentPowerMultiplier` to `computeEquipmentEffects()` or apply in `computeAllEffects()`
4. Update EquipmentTab.tsx stub to display actual value
5. Update StatsTab.tsx to use proper type-safe access for `enchantmentPowerMultiplier`

---

## Results (Task 18 Implementation)

### Implemented Changes

1. **Added `enchantmentPowerMultiplier` to `ComputedEffects` interface** in `src/lib/game/upgrade-effects.ts`:
   - Added field `enchantmentPowerMultiplier: number;` to the interface
   - Initialized to `1` in the `computeEffects()` function

2. **Handled `enchantPower` stat in `computeEffects()` switch statement** in `src/lib/game/upgrade-effects.ts`:
   - Added case for `enchantPower` in the multiplier effects switch statement
   - Multiplier is applied as: `effects.enchantmentPowerMultiplier *= effect.value;`

3. **Updated `computeEquipmentEffects()` to apply `enchantmentPowerMultiplier`** in `src/lib/game/effects.ts`:
   - Added optional parameter `enchantmentPowerMultiplier: number = 1.0`
   - Applied multiplier to both bonus and multiplier effect values:
     - `const adjustedValue = effect.value * enchantmentPowerMultiplier;`
     - Used `adjustedValue` instead of `effect.value` when computing enchantment effects

4. **Updated `computeAllEffects()` to pass the multiplier** in `src/lib/game/effects.ts`:
   - Now passes `upgradeEffects.enchantmentPowerMultiplier` to `computeEquipmentEffects()`

5. **Replaced stub in EquipmentTab.tsx**:
   - Changed from: "Increases the power of all enchantments. Will be wired from Task 5 implementation."
   - Changed to: "Increases the power of all enchantments by X%. Multiplier applied to all enchantment effects."
   - Now displays actual `enchantmentPowerMultiplier` value from `getUnifiedEffects(store)`
   - Added `getUnifiedEffects` import from `@/lib/game/effects`

6. **Updated StatsTab.tsx to use type-safe access**:
   - Changed from type cast workaround: `(upgradeEffects as Record<string, number>).enchantPower`
   - Changed to proper access: `upgradeEffects?.enchantmentPowerMultiplier`
   - Now displays the actual multiplier value and percentage

### Audit of Other Unwired Stubs

1. **AttunementsTab.tsx - Disenchanting TODO (Line 198)**: Logged in `docs/task5.md` under "Known Gaps" - waiting for Bug 13
2. **AttunementsTab.tsx - Research TODO (Line 249)**: Logged in `docs/task5.md` under "Known Gaps" - waiting for Bug 12
3. **AttunementsTab.tsx.backup - TODOs**: Backup file - ignored
4. **skill-evolution.ts - Attunement Requirement Placeholder (Line 2218)**: Logged in `docs/task5.md` under "Known Gaps" - placeholder for future implementation
5. **StatsTab.tsx - Enchantment Power**: ✅ Fixed (was already labeled "Wired" but now properly implemented)

### Files Modified
- `src/lib/game/upgrade-effects.ts` - Added `enchantmentPowerMultiplier` field and handler
- `src/lib/game/effects.ts` - Updated `computeEquipmentEffects()` and `computeAllEffects()` to apply multiplier
- `src/components/game/tabs/EquipmentTab.tsx` - Replaced stub, added import, displays actual value
- `src/components/game/tabs/StatsTab.tsx` - Updated to use type-safe access for `enchantmentPowerMultiplier`
- `docs/task5.md` - Added "Known Gaps" section documenting unwired stubs

### Testing Notes
- The `enchantmentPowerMultiplier` defaults to `1.0` (no effect)
- Skill perks that use `{ type: 'multiplier', stat: 'enchantPower', value: <decimal> }` will now properly affect enchantment power
- All enchantment effect values (both bonus and multiplier types) are multiplied by `enchantmentPowerMultiplier`
- The multiplier is applied per stack (each stack's effect value is multiplied)

### Status
✅ All tasks completed successfully