// ── Player: game-account linking + reads ───────────────────────────────────
//
// The player-facing surface for the uo-link integration. A logged-in player
// runs [link in game, gets a one-time code, and enters it here — the server
// confirms it with the sidecar (which permanently tags the game account with the
// website user id) and mirrors the link locally. Roster/vendor reads are
// ownership-checked against that mirror so a player can only see accounts they
// have linked. The sidecar token stays server-side throughout.

const uoLinkClient = require('../../../utils/uoLinkClient')
const shardLinks = require('../../../model/shardLinks/shardLinks.model')
const shardEvents = require('../../../model/shardEvents/shardEvents.model')
const activity = require('../../../model/activity/activity.model')

const log = require('../../../utils/logger')('player-shard')

const SERIAL_RE = /^0x[0-9a-fA-F]+$/

// POST /player/shard/link — confirm an in-game link code.
async function link(req, res) {
  const { code } = req.body
  try {
    const result = await uoLinkClient.confirmLink(code, req.user.id)

    if (result.ok && result.data && result.data.kind === 'link.ok') {
      const account = result.data.account
      await shardLinks.link({ account, userId: req.user.id, charName: result.data.char || null })
      await activity.log({ req, action: 'uoLink.account.link', detail: { account } })
      log.info('player linked game account', { user: req.user.username, account })
      return res.json({ linked: true, account })
    }

    // Sidecar reports bad/expired codes as 400 link.error or 404.
    if (result.status === 400 || result.status === 404) {
      return res.status(400).json({ message: 'That code is unknown or has expired. Run [link in game for a new one.' })
    }
    if (result.status === 503 || result.status === 0) {
      return res.status(503).json({ message: 'The shard is unavailable right now — try again shortly.' })
    }
    return res.status(502).json({ message: 'Could not confirm the link with the shard.' })
  } catch (err) {
    log.error('player.shard.link', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /player/shard/accounts — the caller's linked game accounts.
async function listAccounts(req, res) {
  try {
    return res.json(await shardLinks.listForUser(req.user.id))
  } catch (err) {
    log.error('player.shard.listAccounts', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// Admins may view any character's data; everyone else is limited to accounts
// they have personally linked. The same handlers back /player/shard (role
// `player`, never admin) and /admin/shard (staff), so this bypass only ever
// widens access for genuine admins.
const isAdmin = (req) => req.user && req.user.role === 'admin'

// Shared ownership gate + live round-trip for roster/vendors. `fetcher` is the
// uoLinkClient method to call with the account.
async function ownedRoundTrip(req, res, fetcher, label) {
  const { account } = req.params
  try {
    const owns = isAdmin(req) || (await shardLinks.ownsAccount(account, req.user.id))
    if (!owns) return res.status(403).json({ message: 'That account is not linked to your profile.' })

    const result = await fetcher(account)
    if (result.ok) return res.json(result.data)
    if (result.status === 404) return res.status(404).json({ message: 'Not found.' })
    if (result.status === 503 || result.status === 0) {
      return res.status(503).json({ message: 'The shard is unavailable right now — try again shortly.' })
    }
    return res.status(502).json({ message: 'Could not reach the shard.' })
  } catch (err) {
    log.error(`player.shard.${label}`, err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /player/shard/roster/:account — characters on a linked account.
const roster = (req, res) => ownedRoundTrip(req, res, uoLinkClient.getRoster, 'roster')

// GET /player/shard/vendors/:account — player vendors on a linked account.
const vendors = (req, res) => ownedRoundTrip(req, res, uoLinkClient.getVendors, 'vendors')

// GET /player/shard/char/:serial — a character sheet, but ONLY if the character's
// account is linked to the caller. The sidecar returns the owning account in the
// profile, which we check against the caller's links before returning anything.
async function getChar(req, res) {
  const { serial } = req.params
  if (!SERIAL_RE.test(serial)) return res.status(400).json({ message: 'Invalid serial.' })
  try {
    const result = await uoLinkClient.getCharBySerial(serial)
    if (result.ok) {
      // Admins see any character; others only characters on an account they linked.
      if (!isAdmin(req)) {
        const acct = result.data && result.data.acct
        const owns = acct ? await shardLinks.ownsAccount(acct, req.user.id) : false
        if (!owns) return res.status(403).json({ message: 'That character is not on an account linked to you.' })
      }
      return res.json(result.data)
    }
    if (result.status === 404) return res.status(404).json({ message: 'Character not found.' })
    if (result.status === 503 || result.status === 0) {
      return res.status(503).json({ message: 'The game server is restarting — try again shortly.' })
    }
    return res.status(502).json({ message: 'Could not reach the shard.' })
  } catch (err) {
    log.error('player.shard.getChar', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

// GET /player/shard/sales — recent player-vendor sales for the caller's linked
// accounts only (as seller/owner). Read from the site's own event log.
async function getSales(req, res) {
  try {
    const links = await shardLinks.listForUser(req.user.id)
    const accounts = new Set(links.map((l) => l.account))
    if (accounts.size === 0) return res.json([])
    const events = await shardEvents.list({ kind: 'vendor.sale', limit: 500 })
    const mine = events
      .filter((e) => e.payload && accounts.has(e.payload.ownerAcct))
      .slice(0, 50)
      .map((e) => ({
        t: e.t,
        itemType: e.payload.itemType,
        amount: e.payload.amount,
        price: e.payload.price,
        commission: e.payload.commission,
        ownerAcct: e.payload.ownerAcct,
      }))
    return res.json(mine)
  } catch (err) {
    log.error('player.shard.getSales', err)
    return res.status(500).json({ message: 'Internal Server Error' })
  }
}

module.exports = { link, listAccounts, roster, vendors, getChar, getSales }