Add run loop implementation plan

docs/plans/2026-02-24-run-loop-plan.md

@@ -0,0 +1,586 @@
+# Run Loop Implementation Plan
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Create a fight → reward → fight → die → restart loop so the game never dead-ends.
+
+**Architecture:** Add a run state layer above combat state that tracks the player's evolving deck, HP, and card rewards deck across multiple combats. After victory, show 3 cards from the rewards deck for the player to pick from (or skip). After defeat, restart everything fresh. Combat state is created from run state each fight.
+
+**Tech Stack:** Vanilla JS, ES modules, bun test, biome
+
+---
+
+### Task 1: Run state module
+
+**Files:**
+- Create: `src/run.js`
+- Test: `src/run.test.js`
+
+**Step 1: Write failing tests for createRunState**
+
+```javascript
+import { describe, test, expect } from "bun:test";
+import { createRunState } from "./run.js";
+import { initCards } from "./cards.js";
+
+describe("createRunState", () => {
+  test("initializes ironclad run with starter deck", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    expect(run.character).toBe("ironclad");
+    expect(run.hp).toBe(11);
+    expect(run.maxHp).toBe(11);
+    expect(run.deck).toEqual([
+      "strike_r", "strike_r", "strike_r", "strike_r", "strike_r",
+      "defend_r", "defend_r", "defend_r", "defend_r",
+      "bash",
+    ]);
+    expect(run.combatCount).toBe(0);
+  });
+
+  test("builds rewards deck from common + uncommon cards", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    expect(run.cardRewardsDeck.length).toBe(56);
+    // should not contain starters, rares, or upgraded cards
+    expect(run.cardRewardsDeck).not.toContain("strike_r");
+    expect(run.cardRewardsDeck).not.toContain("bash");
+    expect(run.cardRewardsDeck).not.toContain("barricade");
+    expect(run.cardRewardsDeck).not.toContain("anger+");
+    // should contain common and uncommon
+    expect(run.cardRewardsDeck).toContain("anger");
+    expect(run.cardRewardsDeck).toContain("battle_trance");
+  });
+
+  test("rewards deck is shuffled (not alphabetical)", async () => {
+    await initCards();
+    const run1 = createRunState("ironclad");
+    const run2 = createRunState("ironclad");
+    // extremely unlikely both are identical if shuffled
+    const same = run1.cardRewardsDeck.every((c, i) => c === run2.cardRewardsDeck[i]);
+    expect(same).toBe(false);
+  });
+});
+```
+
+**Step 2: Run tests to verify they fail**
+
+Run: `bun test src/run.test.js`
+Expected: FAIL - module not found
+
+**Step 3: Write createRunState implementation**
+
+In `src/run.js`:
+
+```javascript
+import { getStarterDeck, getCard } from "./cards.js";
+import { shuffle } from "./state.js";
+
+export function createRunState(character) {
+  return {
+    character,
+    hp: 11,
+    maxHp: 11,
+    deck: [...getStarterDeck(character)],
+    cardRewardsDeck: buildRewardsDeck(character),
+    combatCount: 0,
+  };
+}
+
+function buildRewardsDeck(character) {
+  const cards = [];
+  // getCard returns undefined for unknown ids, so we need to iterate all cards
+  // we need access to the card database - add a getAllCards export to cards.js
+  for (const card of getAllCards()) {
+    if (
+      card.character === character &&
+      (card.rarity === "common" || card.rarity === "uncommon") &&
+      !card.id.endsWith("+")
+    ) {
+      cards.push(card.id);
+    }
+  }
+  return shuffle([...cards]);
+}
+```
+
+Note: this requires exporting `shuffle` from state.js and adding `getAllCards` to cards.js. See step 4.
+
+**Step 4: Export shuffle from state.js, add getAllCards to cards.js**
+
+In `src/state.js`, the `shuffle` function needs to be exported. Find the existing shuffle function and add `export` keyword.
+
+In `src/cards.js`, add:
+
+```javascript
+export function getAllCards() {
+  return Object.values(cardDb);
+}
+```
+
+**Step 5: Run tests to verify they pass**
+
+Run: `bun test src/run.test.js`
+Expected: PASS (3 tests)
+
+**Step 6: Commit**
+
+```
+Add run state module with createRunState and rewards deck builder
+```
+
+---
+
+### Task 2: Reveal and pick reward cards
+
+**Files:**
+- Modify: `src/run.js`
+- Test: `src/run.test.js`
+
+**Step 1: Write failing tests for revealRewards and pickReward**
+
+Add to `src/run.test.js`:
+
+```javascript
+import { createRunState, revealRewards, pickReward, skipRewards } from "./run.js";
+
+describe("revealRewards", () => {
+  test("reveals top 3 cards from rewards deck", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    const top3 = run.cardRewardsDeck.slice(0, 3);
+    const result = revealRewards(run);
+    expect(result.revealed).toEqual(top3);
+    expect(result.cardRewardsDeck.length).toBe(53);
+  });
+
+  test("reveals fewer if deck has < 3 cards", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    run.cardRewardsDeck = ["anger", "flex"];
+    const result = revealRewards(run);
+    expect(result.revealed).toEqual(["anger", "flex"]);
+    expect(result.cardRewardsDeck.length).toBe(0);
+  });
+});
+
+describe("pickReward", () => {
+  test("adds picked card to deck", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    const revealed = ["anger", "flex", "cleave"];
+    const result = pickReward(run, revealed, 0);
+    expect(result.deck).toContain("anger");
+    expect(result.deck.length).toBe(11); // 10 starter + 1
+  });
+
+  test("does not return unpicked cards to rewards deck", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    // remove these from rewards deck so we can track them
+    run.cardRewardsDeck = run.cardRewardsDeck.filter(
+      (c) => !["anger", "flex", "cleave"].includes(c)
+    );
+    const revealed = ["anger", "flex", "cleave"];
+    const result = pickReward(run, revealed, 0);
+    // flex and cleave are gone (not in deck, not in rewards)
+    expect(result.deck).not.toContain("flex");
+    expect(result.cardRewardsDeck).not.toContain("flex");
+  });
+});
+
+describe("skipRewards", () => {
+  test("shuffles all revealed cards back into rewards deck", async () => {
+    await initCards();
+    const run = createRunState("ironclad");
+    run.cardRewardsDeck = ["a", "b", "c"];
+    const revealed = ["x", "y", "z"];
+    const result = skipRewards(run, revealed);
+    expect(result.cardRewardsDeck.length).toBe(6);
+    expect(result.cardRewardsDeck).toContain("x");
+    expect(result.cardRewardsDeck).toContain("y");
+    expect(result.cardRewardsDeck).toContain("z");
+  });
+});
+```
+
+**Step 2: Run tests to verify they fail**
+
+Run: `bun test src/run.test.js`
+Expected: FAIL - functions not exported
+
+**Step 3: Implement revealRewards, pickReward, skipRewards**
+
+Add to `src/run.js`:
+
+```javascript
+export function revealRewards(run) {
+  const count = Math.min(3, run.cardRewardsDeck.length);
+  const revealed = run.cardRewardsDeck.slice(0, count);
+  const remaining = run.cardRewardsDeck.slice(count);
+  return { ...run, revealed, cardRewardsDeck: remaining };
+}
+
+export function pickReward(run, revealed, index) {
+  const picked = revealed[index];
+  return {
+    ...run,
+    deck: [...run.deck, picked],
+  };
+}
+
+export function skipRewards(run, revealed) {
+  return {
+    ...run,
+    cardRewardsDeck: shuffle([...run.cardRewardsDeck, ...revealed]),
+  };
+}
+```
+
+**Step 4: Run tests to verify they pass**
+
+Run: `bun test src/run.test.js`
+Expected: PASS (all tests)
+
+**Step 5: Commit**
+
+```
+Add reward reveal, pick, and skip functions
+```
+
+---
+
+### Task 3: Create combat from run state
+
+**Files:**
+- Modify: `src/state.js`
+- Test: `src/state.test.js` (or add to existing tests)
+
+**Step 1: Write failing tests for createCombatFromRun**
+
+Find existing state tests and add (or create `src/run.test.js` additions):
+
+```javascript
+import { createCombatFromRun } from "./state.js";
+import { initCards } from "./cards.js";
+import { initEnemies } from "./enemies.js";
+import { createRunState } from "./run.js";
+
+describe("createCombatFromRun", () => {
+  test("uses run deck instead of starter deck", async () => {
+    await initCards();
+    await initEnemies();
+    const run = createRunState("ironclad");
+    run.deck = [...run.deck, "anger"]; // 11 cards
+    const state = createCombatFromRun(run, "jaw_worm");
+    const allCards = [
+      ...state.players[0].drawPile,
+      ...state.players[0].hand,
+      ...state.players[0].discardPile,
+    ];
+    expect(allCards.length).toBe(11);
+    expect(allCards).toContain("anger");
+  });
+
+  test("uses run HP", async () => {
+    await initCards();
+    await initEnemies();
+    const run = createRunState("ironclad");
+    run.hp = 7;
+    const state = createCombatFromRun(run, "jaw_worm");
+    expect(state.players[0].hp).toBe(7);
+    expect(state.players[0].maxHp).toBe(11);
+  });
+
+  test("increments combatCount on run", async () => {
+    await initCards();
+    await initEnemies();
+    const run = createRunState("ironclad");
+    expect(run.combatCount).toBe(0);
+    const state = createCombatFromRun(run, "jaw_worm");
+    // combat state should carry the combat number
+    expect(state.combat.combatCount).toBe(1);
+  });
+});
+```
+
+**Step 2: Run tests to verify they fail**
+
+Run: `bun test src/state.test.js` (or whichever file)
+Expected: FAIL
+
+**Step 3: Implement createCombatFromRun**
+
+Add to `src/state.js`:
+
+```javascript
+export function createCombatFromRun(run, enemyIdOrIds) {
+  const enemyIds = Array.isArray(enemyIdOrIds) ? enemyIdOrIds : [enemyIdOrIds];
+  const enemies = enemyIds.map((id, i) => makeEnemy(id, i));
+
+  const player = {
+    id: 0,
+    character: run.character,
+    hp: run.hp,
+    maxHp: run.maxHp,
+    energy: 3,
+    maxEnergy: 3,
+    block: 0,
+    strength: 0,
+    vulnerable: 0,
+    weak: 0,
+    drawPile: shuffle([...run.deck]),
+    hand: [],
+    discardPile: [],
+    exhaustPile: [],
+    powers: [],
+  };
+
+  return {
+    players: [player],
+    enemies,
+    combat: {
+      turn: 1,
+      phase: "player_turn",
+      dieResult: null,
+      selectedCard: null,
+      log: [],
+      playerCount: 1,
+      activePlayerIndex: null,
+      playersReady: [],
+      combatCount: run.combatCount + 1,
+    },
+    player,
+    enemy: enemies[0],
+  };
+}
+```
+
+**Step 4: Run tests to verify they pass**
+
+Run: `bun test`
+Expected: PASS
+
+**Step 5: Commit**
+
+```
+Add createCombatFromRun to build combat state from run
+```
+
+---
+
+### Task 4: Wire the run loop in main.js
+
+**Files:**
+- Modify: `src/main.js`
+
+This task connects the run state, combat, rewards, and restart flow. No unit tests for this task (it's DOM wiring) - we'll verify by playing.
+
+**Step 1: Update init() to create run state**
+
+Replace the current init:
+
+```javascript
+import { createRunState, revealRewards, pickReward, skipRewards } from "./run.js";
+import { createCombatFromRun } from "./state.js";
+
+let state = null;
+let run = null;
+let revealed = null;
+
+async function init() {
+  await Promise.all([initCards(), initEnemies()]);
+  startNewRun();
+}
+
+function startNewRun() {
+  run = createRunState("ironclad");
+  startNextCombat();
+}
+
+function startNextCombat() {
+  run = { ...run, combatCount: run.combatCount + 1 };
+  state = createCombatFromRun(run, "jaw_worm");
+  state = startTurn(state);
+  revealed = null;
+  render(state);
+}
+```
+
+**Step 2: Update victory handling to show rewards phase**
+
+When combat ends in victory, transition to rewards instead of dead-ending. In the places where `checkCombatEnd` returns "victory":
+
+```javascript
+const result = checkCombatEnd(state);
+if (result === "victory") {
+  state = { ...state, combat: { ...state.combat, phase: "rewards" } };
+  const rewardResult = revealRewards(run);
+  run = rewardResult;
+  revealed = rewardResult.revealed;
+  render(state, revealed);
+  return;
+}
+if (result === "defeat") {
+  state = { ...state, combat: { ...state.combat, phase: "ended", result: "defeat" } };
+  render(state);
+  return;
+}
+```
+
+**Step 3: Update defeat handling to allow restart**
+
+Add click handler on overlay for restart:
+
+```javascript
+document.getElementById("overlay").addEventListener("click", () => {
+  if (state.combat.phase === "ended" && state.combat.result === "defeat") {
+    startNewRun();
+  }
+});
+```
+
+**Step 4: Commit**
+
+```
+Wire run loop in main.js with victory rewards and defeat restart
+```
+
+---
+
+### Task 5: Render rewards screen and handle pick/skip
+
+**Files:**
+- Modify: `src/render.js`
+- Modify: `src/main.js`
+- Modify: `index.html`
+
+**Step 1: Add skip button to HTML**
+
+In `index.html`, inside or near the overlay, add a skip button (can be dynamically shown):
+
+```html
+<div id="overlay" hidden>
+  <div id="overlay-text"></div>
+  <div id="reward-cards"></div>
+  <button id="skip-btn" hidden>skip</button>
+</div>
+```
+
+**Step 2: Update renderOverlay to handle rewards phase**
+
+In `src/render.js`, update `renderOverlay`:
+
+```javascript
+function renderOverlay(state, revealed) {
+  const overlay = document.getElementById("overlay");
+  const overlayText = document.getElementById("overlay-text");
+  const rewardCards = document.getElementById("reward-cards");
+  const skipBtn = document.getElementById("skip-btn");
+
+  if (state.combat.phase === "rewards" && revealed) {
+    overlay.hidden = false;
+    overlayText.textContent = "card reward";
+    rewardCards.innerHTML = "";
+    for (const cardId of revealed) {
+      const card = getCard(cardId);
+      const img = document.createElement("img");
+      img.src = card.image || "";
+      img.alt = card.name;
+      img.title = `${card.name} (${card.cost}) - ${card.description}`;
+      img.dataset.cardId = cardId;
+      img.className = "reward-card";
+      rewardCards.appendChild(img);
+    }
+    skipBtn.hidden = false;
+  } else if (state.combat.phase === "ended") {
+    overlay.hidden = false;
+    overlayText.textContent = state.combat.result === "defeat"
+      ? "defeat - click to restart"
+      : "victory";
+    rewardCards.innerHTML = "";
+    skipBtn.hidden = true;
+  } else {
+    overlay.hidden = true;
+    rewardCards.innerHTML = "";
+    skipBtn.hidden = true;
+  }
+}
+```
+
+Update `render` function signature to pass `revealed`:
+
+```javascript
+export function render(state, revealed) {
+  renderEnemy(state);
+  renderInfoBar(state);
+  renderHand(state);
+  renderOverlay(state, revealed);
+}
+```
+
+**Step 3: Add reward pick and skip event handlers in main.js**
+
+```javascript
+document.getElementById("reward-cards").addEventListener("click", (e) => {
+  const img = e.target.closest(".reward-card");
+  if (!img || !revealed) return;
+  const cardId = img.dataset.cardId;
+  const index = revealed.indexOf(cardId);
+  if (index === -1) return;
+  run = pickReward(run, revealed, index);
+  // sync hp back from combat
+  run = { ...run, hp: state.players[0].hp };
+  revealed = null;
+  startNextCombat();
+});
+
+document.getElementById("skip-btn").addEventListener("click", () => {
+  if (!revealed) return;
+  run = skipRewards(run, revealed);
+  run = { ...run, hp: state.players[0].hp };
+  revealed = null;
+  startNextCombat();
+});
+```
+
+**Step 4: Commit**
+
+```
+Add reward card rendering with pick and skip handlers
+```
+
+---
+
+### Task 6: Run checks and verify
+
+**Step 1: Run biome check**
+
+Run: `bun run check`
+Expected: PASS (lint + format + tests)
+
+**Step 2: Manual play test**
+
+Run: `bun run dev`
+
+Verify:
+- Fight jaw worm, win → see 3 reward cards
+- Pick a card → new combat starts, HP carried over
+- Win again → rewards again (deck is bigger now)
+- Lose → "defeat - click to restart" → click → fresh run
+- Skip rewards → next combat starts, rewards deck has those cards back
+
+**Step 3: Fix any issues found**
+
+**Step 4: Commit any fixes**
+
+---
+
+## Task checklist
+
+- [ ] Task 1: Run state module (createRunState, rewards deck builder)
+- [ ] Task 2: Reveal and pick reward cards (revealRewards, pickReward, skipRewards)
+- [ ] Task 3: Create combat from run state (createCombatFromRun)
+- [ ] Task 4: Wire the run loop in main.js
+- [ ] Task 5: Render rewards screen and handle pick/skip
+- [ ] Task 6: Run checks and verify