// ── Admin · Rust · Permissions — a group's chat style (phase 17, D138) ─────
//
// All twelve of BetterChat's group fields, on a group this site authors. A style
// is the whole of a BetterChat group or nothing, so the editor always shows all
// twelve, starting from BetterChat's own defaults.
//
// Three things the section says out loud, because each looks like success from
// here:
//
//   • a server where BetterChat is not loaded holds nothing yet — the style
//     lands when BetterChat does, at the next sync;
//   • a field somebody changed in game is NOT overwritten — it shows under
//     "Changed in game", to adopt or put back;
//   • a field BetterChat refused (`InvalidValue`) is named with its server.
//
// Removing a style removes the group from BetterChat on the next sync (D139),
// which is BetterChat's own `chat group remove` — it has no quieter way.

import { useState } from 'react'

const LABELS = {
  Priority: 'Priority (lower wins when a player is in several groups)',
  Title: 'Title',
  TitleColor: 'Title colour',
  TitleSize: 'Title size',
  TitleHidden: 'Hide the title',
  TitleHiddenIfNotPrimary: 'Hide the title unless this is the player’s main group',
  UsernameColor: 'Name colour',
  UsernameSize: 'Name size',
  MessageColor: 'Message colour',
  MessageSize: 'Message size',
  ChatFormat: 'Chat format',
  ConsoleFormat: 'Console format',
}

/** BetterChat's defaults for this group, from the field list the server sent. */
function defaultsFor(group, fields) {
  const out = {}
  for (const f of fields) out[f.name] = f.default === null ? '' : f.default
  out.Title = group === 'default' ? '[Player]' : `[${group}]`
  return out
}

/** What each server's last sync said about this group's style. */
function styleNotes(group, servers) {
  const notes = []
  for (const s of servers) {
    const chat = s.report && s.report.chat
    if (!chat) continue
    if (chat.loaded === false) {
      notes.push(`${s.serverId}: BetterChat is not loaded, so nothing is styled there yet.`)
      continue
    }
    for (const f of chat.failed || []) {
      if (f.group !== group) continue
      notes.push(`${s.serverId}: BetterChat refused ${f.field || 'the group'} (${f.reason}).`)
    }
  }
  return notes
}

export default function ChatStyleSection({ group, fields, servers, busy, onSave }) {
  const [editing, setEditing] = useState(null)

  if (!fields || !fields.length) return null

  const notes = group.chat ? styleNotes(group.name, servers) : []

  const set = (name, value) => setEditing((e) => ({ ...e, [name]: value }))

  return (
    <>
      <div className="field-label" style={{ marginTop: 18 }}>
        Chat style (BetterChat)
      </div>
      {!editing && !group.chat && (
        <p className="sans dim" style={{ fontSize: '0.8rem', margin: '4px 0' }}>
          No chat style. BetterChat, where it is installed, styles this group’s members as it does anybody else.
        </p>
      )}
      {!editing && group.chat && (
        <p className="sans" style={{ fontSize: '0.82rem', margin: '4px 0' }}>
          <span style={{ color: /^#[0-9a-f]{6}$/i.test(group.chat.TitleColor) ? group.chat.TitleColor : undefined, fontWeight: 600 }}>
            {group.chat.TitleHidden === 'true' ? '(title hidden)' : group.chat.Title}
          </span>{' '}
          <span className="dim" style={{ fontSize: '0.76rem' }}>
            priority {group.chat.Priority} · <code>{group.chat.ChatFormat}</code>
          </span>
        </p>
      )}
      {notes.map((n) => (
        <p key={n} className="sans" style={{ color: '#d08a2a', fontSize: '0.76rem', margin: '2px 0' }}>{n}</p>
      ))}

      {!editing && (
        <div style={{ display: 'flex', gap: 8, marginTop: 6 }}>
          <button
            type="button"
            className="btn"
            disabled={busy}
            onClick={() => setEditing({ ...defaultsFor(group.name, fields), ...(group.chat || {}) })}
          >
            {group.chat ? 'Edit the style' : 'Give it a chat style'}
          </button>
          {group.chat && (
            <button type="button" className="btn btn-ghost" disabled={busy} onClick={() => onSave(null)}>
              Remove the style
            </button>
          )}
        </div>
      )}

      {editing && (
        <form
          onSubmit={async (event) => {
            event.preventDefault()
            if (await onSave(editing)) setEditing(null)
          }}
          className="sans"
          style={{ display: 'grid', gap: 8, marginTop: 8, fontSize: '0.82rem' }}
        >
          {fields.map((f) => (
            <label key={f.name} style={{ display: 'grid', gridTemplateColumns: 'minmax(160px, 1fr) 2fr', gap: 8, alignItems: 'center' }}>
              <span>{LABELS[f.name] || f.name}</span>
              {f.type === 'bool' ? (
                <select className="input" value={editing[f.name]} onChange={(e) => set(f.name, e.target.value)}>
                  <option value="false">No</option>
                  <option value="true">Yes</option>
                </select>
              ) : f.type === 'color' ? (
                <span style={{ display: 'flex', gap: 6 }}>
                  <input
                    type="color"
                    value={/^#[0-9a-f]{6}$/i.test(editing[f.name]) ? editing[f.name] : '#ffffff'}
                    onChange={(e) => set(f.name, e.target.value)}
                    aria-label={LABELS[f.name]}
                    style={{ width: 36, height: 28, padding: 0, border: 'none', background: 'none' }}
                  />
                  <input className="input" value={editing[f.name]} onChange={(e) => set(f.name, e.target.value)} style={{ flex: 1 }} />
                </span>
              ) : (
                <input
                  className="input"
                  type={f.type === 'int' || f.type === 'size' ? 'number' : 'text'}
                  value={editing[f.name]}
                  onChange={(e) => set(f.name, e.target.value)}
                />
              )}
            </label>
          ))}
          <p className="dim" style={{ fontSize: '0.74rem', margin: 0 }}>
            A format must hold <code>{'{Message}'}</code> exactly once; <code>{'{Title}'}</code> and <code>{'{Username}'}</code>{' '}
            are where the title and name go. A hand edit in game is reported rather than overwritten.
          </p>
          <div style={{ display: 'flex', gap: 8 }}>
            <button type="submit" className="btn" disabled={busy}>Save the style</button>
            <button type="button" className="btn btn-ghost" disabled={busy} onClick={() => setEditing(null)}>Cancel</button>
          </div>
        </form>
      )}
    </>
  )
}