# Task6-1 Context: Proposal 1 - Unlocked Mana Type Capacity

## Overview
Gathered context for implementing Proposal 1: Unlocked Mana Type Capacity. This proposal likely relates to either:
1. Increasing the mana capacity (max) of unlocked mana types
2. Increasing the number of mana types that can be unlocked

## 1. Existing Prestige Upgrade Structure

**File:** `src/lib/game/constants/prestige.ts`

### PrestigeDef Interface (from `src/lib/game/types/skills.ts`)
```typescript
export interface PrestigeDef {
  name: string;
  desc: string;
  max: number;
  cost: number;
}
```

### Current Prestige Upgrades (relevant to mana/elements)
```typescript
export const PRESTIGE_DEF: Record<string, PrestigeDef> = {
  // ... other upgrades ...
  
  // Existing elemental capacity upgrade
  elementalAttune: { 
    name: "Elemental Attunement", 
    desc: "+25 elemental mana cap", 
    max: 10, 
    cost: 600 
  },
  
  // Starting elemental mana upgrade
  elemStart: { 
    name: "Elem. Start",   
    desc: "Start with 5 of each unlocked element", 
    max: 3, 
    cost: 800 
  },
  
  // ... other upgrades ...
};
```

**Key observations:**
- All prestige upgrades use the same structure: name, description, max level, cost
- `elementalAttune` already provides +25 elemental mana cap per level (max 10 levels = +250 cap)
- `elemStart` gives starting elemental mana when a new loop begins
- Upgrades are stored as `Record<string, number>` where the value is the current level

---

## 2. How Mana Type Unlocks Are Tracked

### Element State Structure
**File:** `src/lib/game/types/elements.ts`
```typescript
export interface ElementState {
  current: number;
  max: number;
  unlocked: boolean;
}
```

### Elements Storage in GameState
**File:** `src/lib/game/types/game.ts`
```typescript
export interface GameState {
  // ...
  elements: Record<string, ElementState>;
  // ...
}
```

### Base Unlocked Elements
**File:** `src/lib/game/constants/elements.ts`
```typescript
export const BASE_UNLOCKED_ELEMENTS = ['transference'];
```

**Key observations:**
- Only `transference` starts unlocked by default
- All other 12 elements (fire, water, air, earth, light, dark, death, metal, sand, lightning, crystal, stellar, void) start locked
- Elements have a boolean `unlocked` field - no partial unlocking or limits on number of unlocked types

### Unlocking New Elements
**File:** `src/lib/game/store.ts` (lines 2176-2195)
```typescript
unlockElement: (element: string) => {
  const state = get();
  if (state.elements[element]?.unlocked) return;

  const cost = 500;
  if (state.rawMana < cost) return;

  // ELEMENTAL_AFFINITY: New elements start with 10 capacity
  const effects = getUnifiedEffects(state.skillUpgrades, state.skillTiers);
  const newElementMax = hasSpecial(effects, SPECIAL_EFFECTS.ELEMENTAL_AFFINITY) ? 10 : 0;

  set({
    rawMana: state.rawMana - cost,
    elements: {
      ...state.elements,
      [element]: { ...state.elements[element], unlocked: true, max: newElementMax },
    },
    log: [`✨ ${ELEMENTS[element].name} affinity unlocked!`, ...state.log.slice(0, 49)],
  });
},
```

**Key observations:**
- Unlocking an element costs 500 raw mana
- When unlocked, the element gets `unlocked: true`
- New elements start with `max: 0` unless ELEMENTAL_AFFINITY special effect is active (then max: 10)
- No limit on the NUMBER of elements that can be unlocked - players can unlock all 12+ types

### Element Definitions
**File:** `src/lib/game/constants/elements.ts`

Total element types:
- **Base (7):** fire, water, air, earth, light, dark, death
- **Utility (1):** transference
- **Composite (3):** metal, sand, lightning
- **Exotic (3):** crystal, stellar, void

**Total: 14 element types** (13 unlockable + transference which starts unlocked)

---

## 3. How Mana Capacity Is Applied

### computeElementMax Function
**File:** `src/lib/game/store.ts` (lines 415-432)
```typescript
export function computeElementMax(
  state: Pick<GameState, 'skills' | 'prestigeUpgrades' | 'skillUpgrades' | 'skillTiers'>,
  effects?: ComputedEffects | UnifiedEffects,
  element?: string
): number {
  const pu = state.prestigeUpgrades;
  const base = 10 + (state.skills.elemAttune || 0) * 50 + (pu.elementalAttune || 0) * 25;
  
  // Apply upgrade effects if provided
  if (effects) {
    let bonus = effects.elementCapBonus; // Global bonus
    
    // Add per-element bonus if element is specified and available
    if (element && (effects as UnifiedEffects).perElementCapBonus) {
      const perElementBonus = (effects as UnifiedEffects).perElementCapBonus[element];
      if (perElementBonus) {
        bonus += perElementBonus;
      }
    }
    
    return Math.floor((base + bonus) * effects.elementCapMultiplier);
  }
  return base;
}
```

**Key observations:**
- Base capacity formula: `10 + (elemAttune skill levels * 50) + (elementalAttune prestige levels * 25)`
- Effects system can modify capacity via:
  - `elementCapBonus`: Global flat bonus
  - `elementCapMultiplier`: Global multiplier
  - `perElementCapBonus[element]`: Per-element flat bonus (from equipment)
- **Currently, all unlocked elements share the SAME max capacity** (calculated once and applied to all)
- The `perElementCapBonus` exists but is currently only used for equipment effects

### Usage in Store Initialization
**File:** `src/lib/game/store.ts` (lines 670-710)
```typescript
function makeInitial(overrides: Partial<GameState> = {}): GameState {
  const pu = overrides.prestigeUpgrades || {};
  // ...
  const elemMax = computeElementMax(
    { skills: overrides.skills || {}, prestigeUpgrades: pu, skillUpgrades: overrides.skillUpgrades, skillTiers: overrides.skillTiers }, 
    effects
  );
  
  const elements: Record<string, { current: number; max: number; unlocked: boolean }> = {};
  Object.keys(ELEMENTS).forEach((k) => {
    const isUnlocked = BASE_UNLOCKED_ELEMENTS.includes(k);
    let startAmount = 0;
    
    // Start with some elemental mana if elemStart upgrade
    if (isUnlocked && pu.elemStart) {
      startAmount = pu.elemStart * 5;
    }
    
    elements[k] = {
      current: overrides.elements?.[k]?.current ?? startAmount,
      max: elemMax,  // <-- Same max for ALL elements
      unlocked: isUnlocked,
    };
  });
  // ...
}
```

**Key observation:** The same `elemMax` is applied to ALL elements regardless of type or unlock status.

---

## 4. Save Data Structure (Cross-Loop Persistence)

### GameState Prestige-Related Fields
**File:** `src/lib/game/types/game.ts`
```typescript
export interface GameState {
  // ...
  
  // Prestige
  insight: number;
  totalInsight: number;
  prestigeUpgrades: Record<string, number>;
  memorySlots: number;
  memories: string[];
  
  // Elements
  elements: Record<string, ElementState>;
  
  // ...
}
```

### What Persists Through Loops
**File:** `src/lib/game/store.ts` (lines 2255-2290)
```typescript
startNewLoop: () => {
  const state = get();
  const insightGained = state.loopInsight || calcInsight(state);
  const total = state.insight + insightGained;
  
  // ... (keep some spells through temporal memory)
  
  const newState = makeInitial({
    loopCount: state.loopCount + 1,
    insight: total,
    totalInsight: (state.totalInsight || 0) + insightGained,
    prestigeUpgrades: state.prestigeUpgrades,  // <-- PERSISTS
    memories: state.memories,
    skills: state.skills,
    manaHeartBonus: newHeartBonus,
  });
  
  // ...
  set(newState);
},
```

**Key observations:**
- `prestigeUpgrades` (all upgrade levels) persist through loops
- `insight` and `totalInsight` persist and accumulate
- `elements` are NOT persisted - they are reinitialized in `makeInitial()`
- On new loop, element unlocks are lost (player must re-unlock elements)
- `BASE_UNLOCKED_ELEMENTS` and `pu.elemStart` determine which elements start unlocked/have starting mana

### Purchasing Prestige Upgrades
**File:** `src/lib/game/store.ts` (lines 2235-2250)
```typescript
doPrestige: (id: string) => {
  // ...
  const lvl = state.prestigeUpgrades[id] || 0;
  if (lvl >= pd.max || state.insight < pd.cost) return;

  const newPU = { ...state.prestigeUpgrades, [id]: lvl + 1 };
  set({
    insight: state.insight - pd.cost,
    prestigeUpgrades: newPU,
    // ...
  });
},
```

**Key observations:**
- Upgrades purchased with `insight` currency
- Each level costs the same amount (flat cost model)
- Max level check prevents over-purchasing
- New upgrade level is saved to `prestigeUpgrades` record

---

## Summary of Key Points for Task6-1

1. **Prestige upgrades** follow a simple structure: `{ name, desc, max, cost }`
2. **Element capacity** is currently global (same for all elements), calculated from:
   - Base: 10
   - Skill: `elemAttune` levels × 50
   - Prestige: `elementalAttune` levels × 25
   - Effects: bonuses and multipliers
3. **Element unlocks** are per-type (boolean), cost 500 raw mana each
4. **No limit** on number of unlocked element types currently exists
5. **Per-element capacity** bonuses exist in effects system (`perElementCapBonus`) but aren't widely used
6. **Cross-loop persistence:** prestige upgrades and insight persist; element unlocks do NOT persist
7. **14 total element types** available (13 unlockable + transference)

## Questions for Implementation

Depending on what "Unlocked Mana Type Capacity" means:

**If it means increasing capacity (max mana) of unlocked types:**
- Could add a new prestige upgrade similar to `elementalAttune`
- Could modify the `computeElementMax` function
- Could add per-element capacity tracking

**If it means increasing the NUMBER of types that can be unlocked:**
- Need to add a limit/cap on unlocked types (currently unlimited)
- Need to add a prestige upgrade to increase this limit
- Need to modify `unlockElement` to check against the limit