# Account Sync Drafts Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** Add lightweight account/password auth, cloud draft persistence, cross-device restore, resumable episode conversion, and full-regenerate controls.

**Architecture:** Keep the current Vite frontend, add a minimal Express + SQLite backend under `server/`, and let the frontend auto-save/load the current draft for the logged-in account. Continue using the existing conversion UI, but persist the generated episode results and resume state remotely.

**Tech Stack:** React 19, TypeScript, Vite, Express, better-sqlite3, Node crypto, SQLite

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### Task 1: Create backend skeleton and shared storage model

**Files:**
- Create: `server/index.ts`
- Create: `server/db.ts`
- Create: `server/auth.ts`
- Modify: `package.json`
- Modify: `vite.config.ts`

**Step 1: Add a backend run script**
- Add `dev:server` and `dev:full` scripts.
- Keep existing frontend scripts unchanged.

**Step 2: Create SQLite schema helpers**
- Add `users`, `sessions`, and `drafts` tables.
- Store one current draft JSON blob per user for now.

**Step 3: Add Express server bootstrap**
- Enable JSON body parsing.
- Mount auth and draft endpoints under `/api`.

**Step 4: Add Vite proxy for local development**
- Proxy `/api` to the local backend server.

**Step 5: Verify backend compiles under TypeScript**
- Run `npm run lint`.

### Task 2: Implement lightweight account/password authentication

**Files:**
- Modify: `server/db.ts`
- Modify: `server/auth.ts`
- Modify: `server/index.ts`

**Step 1: Implement password hashing with Node crypto**
- Use `scryptSync` + random salt.

**Step 2: Add register endpoint**
- Accept `username` and `password`.
- Reject duplicate usernames and invalid payloads.

**Step 3: Add login endpoint**
- Verify password.
- Create a random session token and persist it.

**Step 4: Add auth middleware**
- Read bearer token.
- Resolve current user from `sessions`.

**Step 5: Add session restore endpoint**
- Return current user info when token is valid.

### Task 3: Add cloud draft persistence endpoints

**Files:**
- Modify: `server/db.ts`
- Modify: `server/index.ts`
- Create: `server/types.ts`

**Step 1: Define draft payload shape**
- Include conversion settings, extracted episodes, conversion episode results, finalized selections, and source metadata.

**Step 2: Add load current draft endpoint**
- Return the saved draft JSON for the authenticated user.

**Step 3: Add save current draft endpoint**
- Upsert the latest draft JSON and update timestamp.

**Step 4: Add reset/restart endpoint if needed**
- Allow frontend to intentionally replace cloud draft on full regeneration.

### Task 4: Add frontend auth state and draft synchronization

**Files:**
- Create: `src/services/api.ts`
- Modify: `src/App.tsx`
- Modify: `src/main.tsx` if needed

**Step 1: Add auth modal/panel UI**
- Support register and login with username/password.

**Step 2: Add token persistence**
- Save token locally and restore session on app load.

**Step 3: Load remote draft on login/app restore**
- Hydrate the conversion state from the server.

**Step 4: Auto-save remote draft**
- Debounce save calls when relevant conversion state changes.
- Save generated content and manual edits.

### Task 5: Strengthen resumable conversion workflow

**Files:**
- Modify: `src/App.tsx`
- Modify: `src/services/ai.ts`
- Modify: `src/lib/conversionWorkflow.ts`
- Modify: `tests/conversionWorkflow.test.ts`

**Step 1: Preserve current stop/resume behavior**
- Keep paused episode/version state intact.

**Step 2: Add `重新全部生成` control**
- When a resumable state exists, show both `继续续集生成` and `重新全部生成`.
- Full regenerate clears existing generated episode results before starting from episode 1.

**Step 3: Ensure manual edits persist**
- Save edited episode version content into draft state and remote storage.

### Task 6: Enforce continuity and scope constraints in generation

**Files:**
- Modify: `src/App.tsx`
- Modify: `src/services/ai.ts`

**Step 1: Build previous-episode continuity context**
- For episode N, pass episode N-1 selected final version, or current active version if not finalized.

**Step 2: Restrict generation scope**
- Explicitly tell the model to only generate within the current episode outline shown on the left.

**Step 3: Reassert global constraints**
- Require adherence to worldview, story outline, and core character settings.

**Step 4: Keep resume continuation safe**
- Continue from already generated content without rewriting earlier text.

### Task 7: Verification

**Files:**
- Test: `tests/conversionWorkflow.test.ts`
- Test: backend endpoint smoke verification via local commands

**Step 1: Run draft workflow unit test**
- Run `node --experimental-strip-types tests/conversionWorkflow.test.ts`

**Step 2: Run type-check**
- Run `npm run lint`

**Step 3: Run production build**
- Run `npm run build`

**Step 4: Smoke-test backend boot if possible**
- Start local backend and verify auth/draft endpoints respond.