import type { Card, Session } from './types'

const SESSION_KEY = 'sapbg-session'

async function post(path: string, body: unknown): Promise<Session> {
  const res = await fetch(path, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  const data = await res.json()
  if (!res.ok) throw new Error(data.error ?? 'request failed')
  return data as Session
}

export type BotDifficulty = 'easy' | 'medium' | 'hard'

export function createGame(name: string): Promise<Session> {
  return post('/api/games', { name })
}

export function joinGame(code: string, name: string): Promise<Session> {
  return post('/api/join', { code, name })
}

export async function fetchCatalog(pack?: string): Promise<Card[]> {
  const url = pack ? `/api/catalog?pack=${encodeURIComponent(pack)}` : '/api/catalog'
  const res = await fetch(url)
  if (!res.ok) throw new Error('failed to load catalog')
  return (await res.json()) as Card[]
}

export function loadSession(): Session | null {
  try {
    const raw = localStorage.getItem(SESSION_KEY)
    return raw ? (JSON.parse(raw) as Session) : null
  } catch {
    return null
  }
}

export function saveSession(s: Session) {
  localStorage.setItem(SESSION_KEY, JSON.stringify(s))
}

export function clearSession() {
  localStorage.removeItem(SESSION_KEY)
}