// ── Admin · Rust · Servers — chat titles and the voice (phase 17) ─────────
//
// Two things the servers page gained with BetterChat and PopupNotifications
// becoming optional (PLAN.md §33):
//
//  • **A server's chat titles** (D135, D136): rules that rank the current wipe,
//    in the operator's order, and how many a player shows. Saved with their own
//    PUT, because they are not part of the server row — an operator retitling
//    "Top Killer" must not have to re-type a sidecar address.
//  • **The voice** (D140): the one styled permission group news and event lines
//    are said in. A fleet setting, so it sits once at the foot of the page.
//
// Neither needs BetterChat to save. Titles are held by the plugin until BetterChat
// arrives, and the voice is said by our own plugin whether BetterChat is there or
// not; the "What this server has" line says which is which.

import { useState } from 'react'

import { ErrorState, Loading, useAsync } from '../../core.js'
import api from '../../api.js'
import { contrastInk } from '../../lib/format.js'

const STATS = [
  { id: 'kills', label: 'Kills' },
  { id: 'npckills', label: 'NPC kills' },
  { id: 'playtime', label: 'Playtime' },
]

const MODES = [
  { id: 'first', label: 'The first title they earn', hint: 'The rule highest in the list wins.' },
  { id: 'all', label: 'Every title they earn' },
  { id: 'upto', label: 'Up to a number of titles', hint: 'In list order.' },
]

const statLabel = (id) => (STATS.find((s) => s.id === id) || { label: id }).label

/** One line summarising a server's titles, for its row on the list. */
export function titlesSummary(titles, push) {
  const rules = (titles && titles.rules) || []
  if (!rules.length) return 'No chat titles.'
  const list = rules.map((r) => `${r.text} (top ${r.topN} ${statLabel(r.stat).toLowerCase()})`).join(', ')
  const shown = push ? ` Last pushed: ${push.count} player${push.count === 1 ? '' : 's'} hold one${push.betterChat ? '' : ' — BetterChat is not loaded, so they are not showing in game yet'}.` : ''
  return `Chat titles: ${list}.${shown}`
}

/** A title as the leaderboard will show it. */
function Chip({ text, color }) {
  return (
    <span
      className="sans"
      style={{ padding: '1px 6px', borderRadius: 999, fontSize: '0.72rem', fontWeight: 600, background: color, color: contrastInk(color) }}
    >
      {text || '…'}
    </span>
  )
}

export function TitlesForm({ server, onSaved, onCancel }) {
  const start = server.titles || { mode: 'first', max: 2, rules: [] }
  const [mode, setMode] = useState(start.mode)
  const [max, setMax] = useState(start.max)
  const [rules, setRules] = useState(start.rules.map((r) => ({ ...r })))
  const [busy, setBusy] = useState(false)
  const [error, setError] = useState('')

  const setRule = (i, key) => (e) => {
    const value = e.target.value
    setRules((list) => list.map((r, n) => (n === i ? { ...r, [key]: key === 'topN' ? Number(value) : value } : r)))
  }
  const move = (i, by) => setRules((list) => {
    const next = [...list]
    const [r] = next.splice(i, 1)
    next.splice(i + by, 0, r)
    return next
  })

  const save = async (e) => {
    e.preventDefault()
    setBusy(true)
    setError('')
    try {
      await api.admin.saveTitles(server.id, { mode, max: Number(max), rules })
      onSaved()
    } catch (err) {
      setError(err.message || 'That did not save.')
    } finally {
      setBusy(false)
    }
  }

  return (
    <form onSubmit={save} className="panel" style={{ padding: '16px 18px', display: 'grid', gap: 12, marginBottom: 18 }}>
      <h2 className="display" style={{ fontSize: '1.05rem', margin: 0, color: 'var(--head)' }}>Chat titles on {server.name}</h2>
      <p className="sans dim" style={{ fontSize: '0.78rem', margin: 0 }}>
        Each rule gives a title to the top players on this wipe for one stat. A stat of zero earns nothing, so a fresh wipe
        has no titles until somebody plays. Titles show in game chat when BetterChat is installed, and beside the name on
        the leaderboard here and in the app. Up to ten rules; a title is at most 24 characters and cannot carry markup.
      </p>

      {rules.map((r, i) => (
        <div key={i} className="sans" style={{ display: 'flex', flexWrap: 'wrap', gap: 8, alignItems: 'center', fontSize: '0.84rem' }}>
          <span className="dim" style={{ width: 18 }}>{i + 1}</span>
          <span>Top</span>
          <input type="number" min={1} max={10} value={r.topN} onChange={setRule(i, 'topN')} style={{ ...inputStyle, width: 60 }} aria-label="How many players" />
          <select value={r.stat} onChange={setRule(i, 'stat')} style={inputStyle} aria-label="Stat">
            {STATS.map((s) => <option key={s.id} value={s.id}>{s.label}</option>)}
          </select>
          <span>earn</span>
          <input value={r.text} onChange={setRule(i, 'text')} maxLength={24} required style={{ ...inputStyle, width: 160 }} aria-label="Title" />
          <input type="color" value={r.color} onChange={setRule(i, 'color')} aria-label="Colour" style={{ width: 36, height: 28, padding: 0, border: 'none', background: 'none' }} />
          <Chip text={r.text} color={r.color} />
          <span style={{ marginLeft: 'auto', display: 'flex', gap: 4 }}>
            <button type="button" className="btn" disabled={i === 0} onClick={() => move(i, -1)} aria-label="Move up">↑</button>
            <button type="button" className="btn" disabled={i === rules.length - 1} onClick={() => move(i, 1)} aria-label="Move down">↓</button>
            <button type="button" className="btn" onClick={() => setRules((list) => list.filter((_, n) => n !== i))}>Remove</button>
          </span>
        </div>
      ))}
      {rules.length < 10 && (
        <div>
          <button type="button" className="btn" onClick={() => setRules((list) => [...list, { stat: 'kills', topN: 1, text: '', color: '#ffaa55' }])}>
            Add a rule
          </button>
        </div>
      )}

      <div className="sans" style={{ display: 'flex', flexWrap: 'wrap', gap: 12, alignItems: 'center', fontSize: '0.84rem' }}>
        <label style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
          A player shows
          <select value={mode} onChange={(e) => setMode(e.target.value)} style={inputStyle}>
            {MODES.map((m) => <option key={m.id} value={m.id}>{m.label}</option>)}
          </select>
        </label>
        {mode === 'upto' && (
          <label style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
            at most
            <input type="number" min={1} max={5} value={max} onChange={(e) => setMax(e.target.value)} style={{ ...inputStyle, width: 60 }} />
          </label>
        )}
        <span className="dim" style={{ fontSize: '0.74rem' }}>{(MODES.find((m) => m.id === mode) || {}).hint || ''}</span>
      </div>

      <div className="sans" style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
        <button type="submit" className="btn" disabled={busy}>{busy ? 'Saving…' : 'Save titles'}</button>
        <button type="button" className="btn" onClick={onCancel} disabled={busy}>Cancel</button>
        {error && <span style={{ color: '#d08a2a', fontSize: '0.8rem' }}>{error}</span>}
      </div>
    </form>
  )
}

/** What a server says it has loaded, as one sentence (§33.2 `integrations`). */
export function integrationsLine(r) {
  if (!r || !r.integrations) {
    return r && r.ok === false
      ? `The game could not be asked (${r.status}).`
      : 'This server’s plugin is older than protocol 12, so it cannot say which optional mods it has.'
  }
  const one = (name, x, without) => (x && x.loaded ? `${name} ${x.version || ''} is loaded`.trim() : `${name} is not loaded — ${without}`)
  return `${one('BetterChat', r.integrations.betterChat, 'titles and group styles wait for it')}. ${one('PopupNotifications', r.integrations.popupNotifications, 'a popup is refused, and chat still works')}.`
}

export function VoiceCard() {
  const [reloads, setReloads] = useState(0)
  const { data, error: loadError } = useAsync(() => api.admin.voice(), [reloads])
  const [busy, setBusy] = useState(false)
  const [error, setError] = useState('')

  if (loadError) return <ErrorState error={loadError} />
  if (!data) return <Loading />

  const choose = async (group) => {
    setBusy(true)
    setError('')
    try {
      await api.admin.saveVoice(group)
      setReloads((n) => n + 1)
    } catch (err) {
      setError(err.message || 'That did not save.')
    } finally {
      setBusy(false)
    }
  }

  const current = data.options.find((o) => o.group === data.voice)

  return (
    <section className="panel sans" style={{ padding: '16px 18px', marginBottom: 18, fontSize: '0.84rem' }}>
      <h2 className="display" style={{ fontSize: '1.05rem', margin: '0 0 6px', color: 'var(--head)' }}>Announcement voice</h2>
      <p className="dim" style={{ fontSize: '0.78rem', margin: '0 0 10px' }}>
        News posts and event announcements said in game chat can wear the title and colours of one permission group that
        has a chat style. The line has no sender, so no player’s name appears. It works whether or not BetterChat is
        installed. Popups are plain text.
      </p>
      <label style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
        Say them as
        <select value={data.voice} onChange={(e) => choose(e.target.value)} disabled={busy} style={inputStyle}>
          <option value="">Plain chat</option>
          {data.options.map((o) => <option key={o.group} value={o.group}>{o.group} — {o.title}</option>)}
        </select>
      </label>
      {data.voice && !current && (
        <p style={{ color: '#d08a2a', fontSize: '0.78rem', margin: '8px 0 0' }}>
          The group “{data.voice}” no longer has a chat style, so lines are said in plain chat until it has one again or
          another voice is chosen.
        </p>
      )}
      {current && <p className="dim" style={{ fontSize: '0.74rem', margin: '8px 0 0' }}>The line: <code>{current.format}</code></p>}
      {!data.options.length && (
        <p className="dim" style={{ fontSize: '0.76rem', margin: '8px 0 0' }}>No group has a chat style yet. Give one a style under Permissions.</p>
      )}
      {error && <p style={{ color: '#d08a2a', fontSize: '0.8rem', margin: '8px 0 0' }}>{error}</p>}
    </section>
  )
}

const inputStyle = {
  background: 'var(--panel-flat, transparent)',
  color: 'var(--text)',
  border: '1px solid var(--line)',
  borderRadius: 'var(--radius-input, 6px)',
  padding: '5px 8px',
  fontSize: '0.84rem',
}