import { storeJson } from './fileModels/store.json'
import { uiPort } from './utils'
import { T } from '@start9labs/start-sdk'
import { i18n } from './i18n'

/**
 * The one place this package talks to the game server.
 *
 * Everything the health check and the actions report — how many games are running, who is in them,
 * whose turn it is — exists only inside the running server. This package cannot work any of it out
 * for itself: the engine lives in the game repo, and answering "whose turn is it" means replaying
 * a game's whole intent history through it. So the server is asked, and these functions require
 * the daemon to be up. That is why the game actions declare `allowedStatuses: 'running'`.
 */
const base = `http://localhost:${uiPort}`

export type GameRow = {
  gameId: string
  gameCode: string | null
  state: 'running' | 'lobby'
  playerCount: number
  playerNames: string[]
  createdAt: number
  /**
   * The seats a HUMAN holds a session token for — absent on a lobby. Bots never appear: the server
   * reads this from its session map rather than guessing from `playerNames` (Gitea#33).
   */
  seatedPlayers?: number[]
  // Absent on a lobby — it has no game to be part-way through.
  lastMoveAt?: number
  status?: 'active' | 'finished'
  day?: number
  stage?: number
  phase?: string
  waitingOn?: { seat: number; name: string } | null
}

export type HealthCounts = { active: number; lobby: number }

/** `null` when nothing answered — a server still replaying saved games has not bound its port yet. */
export async function fetchHealth(): Promise<HealthCounts | null> {
  try {
    const res = await fetch(`${base}/api/health`)
    if (!res.ok) return null
    const body = (await res.json()) as { games?: HealthCounts }
    return body.games ?? { active: 0, lobby: 0 }
  } catch {
    return null
  }
}

async function adminFetch(
  effects: T.Effects,
  path: string,
  init?: RequestInit,
): Promise<Response> {
  const adminSecret = await storeJson.read((s) => s.adminSecret).once()
  if (!adminSecret) {
    throw new Error(
      i18n(
        'No admin secret is stored for this service, so its games cannot be managed.',
      ),
    )
  }
  const res = await fetch(`${base}${path}`, {
    ...init,
    headers: { ...init?.headers, 'x-admin-secret': adminSecret },
  })
  if (!res.ok) {
    // 404 with a correct secret means the game is gone, not that the route is missing — the
    // routes themselves 404 only when the server has no admin secret at all, and it was given
    // one at install.
    const detail =
      res.status === 404
        ? i18n('that game no longer exists')
        : `${i18n('the server answered')} ${res.status}`
    throw new Error(`${i18n('Could not reach the game server')} — ${detail}.`)
  }
  return res
}

export async function listGames(effects: T.Effects): Promise<GameRow[]> {
  const res = await adminFetch(effects, '/api/games')
  return ((await res.json()) as { games: GameRow[] }).games
}

export async function exportGame(
  effects: T.Effects,
  gameId: string,
): Promise<unknown> {
  const res = await adminFetch(effects, `/api/games/${gameId}/save`)
  return ((await res.json()) as { save: unknown }).save
}

export async function deleteGame(
  effects: T.Effects,
  gameId: string,
): Promise<{ gameCode: string | null; save: unknown }> {
  const res = await adminFetch(effects, `/api/games/${gameId}`, {
    method: 'DELETE',
  })
  return (await res.json()) as { gameCode: string | null; save: unknown }
}

/**
 * Mint a one-time code that puts one player back into their seat — Gitea#33.
 *
 * A session token is the only identity the game has, and it lives in one browser's local storage.
 * Lose it and the seat is unreachable: nothing else on the server will accept a claim to it. So the
 * administrator mints a code for a named seat, and the player opens a link carrying it.
 *
 * THE CODE IS NOT THE TOKEN. The game's own `lobby-and-sessions.md` §1 says to keep the token out of
 * URLs, and this code is going into one — so it is short-lived, single-use, and exchanged for the
 * real token by the page over a POST. `Content-Type` is set here because `adminFetch` spreads these
 * headers alongside the admin secret rather than assuming a body.
 */
export async function mintClaim(
  effects: T.Effects,
  gameId: string,
  player: number,
): Promise<{ code: string; expiresAt: number; player: number; displayName: string; gameCode: string | null }> {
  const res = await adminFetch(effects, `/api/games/${gameId}/claim`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ player }),
  })
  return (await res.json()) as {
    code: string
    expiresAt: number
    player: number
    displayName: string
    gameCode: string | null
  }
}