import { i18n } from '../i18n'
import { sdk } from '../sdk'
import { listGames } from '../serverApi'
import type { GameRow } from '../serverApi'

/** "3 Aug 2026, 14:32" — a timestamp a person reads, not an epoch they decode. */
function when(ms: number): string {
  return new Date(ms).toLocaleString('en-GB', {
    dateStyle: 'medium',
    timeStyle: 'short',
  })
}

function describe(g: GameRow): string {
  const who = g.playerNames.join(', ')
  if (g.state === 'lobby') {
    return [
      i18n('Waiting to start — nobody has played a turn yet.'),
      `${i18n('Seats')} (${g.playerCount}): ${who}`,
      `${i18n('Created')}: ${when(g.createdAt)}`,
    ].join('\n')
  }
  const waiting =
    g.status === 'finished'
      ? i18n('Finished — this game is over and waits on nobody.')
      : g.waitingOn
        ? `${i18n('Waiting on')}: ${g.waitingOn.name} (${i18n('seat')} ${g.waitingOn.seat})`
        : `${i18n('Waiting on')}: ${i18n('nobody — the Mainline Phase is running itself')}`
  return [
    `${i18n('Players')} (${g.playerCount}): ${who}`,
    `${i18n('Day')} ${g.day}, ${i18n('Stage')} ${g.stage} — ${g.phase}`,
    waiting,
    `${i18n('Started')}: ${when(g.createdAt)}`,
    `${i18n('Last move')}: ${g.lastMoveAt === undefined ? i18n('unknown') : when(g.lastMoveAt)}`,
  ].join('\n')
}

/**
 * Read-only, and separate from Manage Game on purpose: this is the one you run without thinking,
 * so it must not be the one that can delete anything.
 *
 * `only-running` because none of this exists on disk in readable form. A save is the seed plus the
 * intents, so "whose turn is it" is only answerable by replaying the game through the engine —
 * which lives in the game repo, not in this package. The running server has already done that work
 * and is asked for the answer.
 */
export const gamesInProgress = sdk.Action.withoutInput(
  'games-in-progress',

  async () => ({
    name: i18n('Games in Progress'),
    description: i18n(
      'List every game and lobby on this server, and where each one has got to',
    ),
    warning: null,
    allowedStatuses: 'only-running',
    group: null,
    visibility: 'enabled',
  }),

  async ({ effects }) => {
    const games = await listGames(effects)
    if (games.length === 0) {
      return {
        version: '1',
        title: i18n('Games in Progress'),
        message: i18n('There are no games on this server.'),
        result: null,
      }
    }
    return {
      version: '1',
      title: i18n('Games in Progress'),
      message: `${games.length} ${i18n('game(s) on this server. Use Manage Game to save one for later, or to end it.')}`,
      result: {
        type: 'group',
        value: games.map((g) => ({
          type: 'single' as const,
          name: g.gameCode ?? g.gameId,
          description: null,
          value: describe(g),
          masked: false,
          copyable: false,
          qr: false,
        })),
      },
    }
  },
)