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+# CLAUDE.md
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+
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+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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+
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+## Commands
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+
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+- `npm run dev` — Start local dev server (Wrangler)
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+- `npm run deploy` — Deploy to Cloudflare Workers (`wrangler deploy`)
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+- `npm test` — Run tests with Vitest (Cloudflare Workers pool)
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+- `npm run cf-typegen` — Regenerate TypeScript types from Wrangler config
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+
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+## Architecture
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+
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+Telegram bot for the CosMoe photography platform (`https://cos.cx/api/v1`), deployed as a Cloudflare Worker with a 1-minute cron trigger.
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+
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+### Entry points (`src/index.ts`)
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+
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+- **fetch handler** — Receives Telegram webhooks, creates a grammy `Bot`, registers commands via `setupCommands()`, delegates to `webhookCallback`.
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+- **scheduled handler** — Runs every minute via cron. Checks for new events and pushes notifications to all registered users.
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+
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+### Command routing (`src/command/index.ts`)
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+
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+`setupCommands()` wires grammy commands, conversation plugins, regex-based `hears` handlers, and `callbackQuery` handlers. The `conversations` plugin uses KV-backed storage for multi-step flows (login).
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+
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+Bot commands: `start`, `login`, `events`, `history`, `logout`
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+Pattern handlers: `/event_{id}`, `/book_{eventId}_{slotIndex}`, `/cancel_{bookingId}`
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+Callback queries: cancel confirmation, coupon selection
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+
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+### Handlers (`src/command/handlers/`)
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+
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+Each is a standalone async function. Most follow the pattern: authenticate user from KV → call CosMoe API → format and reply.
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+
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+### API client (`src/client/cosmoe.ts`)
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+
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+`CosmoeClient` wraps the CosMoe REST API. Auth uses `user_id` + `token` passed as URL params (GET) or FormData (POST). Credentials are stored per-user in `COSMOE_CREDENTIALS` KV keyed by Telegram user ID.
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+
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+### Scheduler (`src/scheduler/index.ts`)
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+
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+Tracks notified event IDs in `COSMOE_STORAGE` KV to avoid duplicate notifications. Iterates all credential keys to broadcast to every registered user.
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+
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+### KV namespaces
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+
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+- `COSMOE_CREDENTIALS` — Per-user auth tokens (keyed by Telegram user ID)
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+- `COSMOE_STORAGE` — Conversation state and scheduler data
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+
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+## Key conventions
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+
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+- All user-facing text is Chinese.
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+- Beijing timezone (UTC+8) is hardcoded for date comparisons in handlers and scheduler.
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+- Formatting: Prettier with tabs, single quotes, 140 char width.
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+- TypeScript: ES2024, strict mode, Bundler module resolution.
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+- The `Env` interface is defined separately in `src/command/index.ts`; handlers receive `env` as an untyped `any` parameter.
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+- Tests use `@cloudflare/vitest-pool-workers` for the Workers runtime.
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