import { useEffect, useState } from 'react'
import { Link, useNavigate } from 'react-router-dom'
import ProviderIcon from '../../components/ProviderIcon.jsx'
import { useAuth } from '../../contexts/AuthContext.jsx'
import { api } from '../../api/client.js'
import PlayerShell, { honeypotStyle } from './PlayerShell.jsx'

export default function PlayerRegister() {
  const { user, register } = useAuth()
  const navigate = useNavigate()

  const [username, setUsername] = useState('')
  const [password, setPassword] = useState('')
  const [email, setEmail] = useState('')
  const [company, setCompany] = useState('') // honeypot — must stay empty
  const [error, setError] = useState('')
  const [busy, setBusy] = useState(false)

  // Which methods are enabled (derived, from /public/settings). null = loading.
  const [avail, setAvail] = useState(null)
  const [providers, setProviders] = useState([])

  useEffect(() => {
    if (user && user.role === 'player') navigate('/player', { replace: true })
  }, [user, navigate])

  useEffect(() => {
    let active = true
    api
      .publicSettings()
      .then((s) => active && setAvail(s?.registration || { password: false, sso: false }))
      .catch(() => active && setAvail({ password: false, sso: false }))
    api
      .authProviders()
      .then((list) => active && setProviders(Array.isArray(list) ? list : []))
      .catch(() => active && setProviders([]))
    return () => {
      active = false
    }
  }, [])

  function startSso(provider) {
    window.location.assign(provider.loginUrl + `?returnTo=${encodeURIComponent('/account')}`)
  }

  async function onSubmit(e) {
    e.preventDefault()
    setError('')
    if (username.trim().length < 3) return setError('Username must be at least 3 characters.')
    if (password.length < 8) return setError('Password must be at least 8 characters.')
    setBusy(true)
    try {
      await register(username.trim(), password, { email: email.trim() || undefined, company })
      navigate('/player', { replace: true })
    } catch (err) {
      if (err.status === 409) setError('That username is already taken.')
      else if (err.status === 403) setError('Registration is not open right now.')
      else if (err.status === 400) setError(err.message || 'Please check your details and try again.')
      else setError('Could not create your account right now.')
      setBusy(false)
    }
  }

  const closed = avail && !avail.password && !avail.sso

  return (
    <PlayerShell
      subtitle="Create a player account"
      footer={
        <p className="sans" style={{ textAlign: 'center', margin: '16px 0 0', color: 'var(--dim)', fontSize: '0.84rem' }}>
          Already have an account?{' '}
          <Link to="/account/login" style={{ color: 'var(--accent)', textDecoration: 'none' }}>
            Sign in
          </Link>
        </p>
      }
    >
      {avail === null && (
        <div style={{ display: 'grid', placeItems: 'center', padding: 20 }}>
          <span className="spin" />
        </div>
      )}
      {avail !== null && closed && (
        <p className="sans" style={{ margin: 0, color: 'var(--muted)', fontSize: '0.9rem', textAlign: 'center', lineHeight: 1.6 }}>
          Self-registration is currently closed. Please check back later.
        </p>
      )}
      {avail !== null && !closed && (
        <>
          {avail.password && (
            <form onSubmit={onSubmit}>
              <label style={{ display: 'block', marginBottom: 16 }}>
                <span className="field-label">Username</span>
                <input type="text" autoComplete="username" autoFocus value={username} onChange={(e) => setUsername(e.target.value)} className="input" />
              </label>
              <label style={{ display: 'block', marginBottom: 16 }}>
                <span className="field-label">Password</span>
                <input type="password" autoComplete="new-password" value={password} onChange={(e) => setPassword(e.target.value)} className="input" />
              </label>
              <label style={{ display: 'block', marginBottom: 22 }}>
                <span className="field-label">Email (optional)</span>
                <input type="email" autoComplete="email" value={email} onChange={(e) => setEmail(e.target.value)} className="input" placeholder="player@example.com" />
                <span className="sans" style={{ display: 'block', marginTop: 6, color: 'var(--dim)', fontSize: '0.74rem' }}>
                  Used only for account recovery help. No password-reset emails yet — a forgotten password
                  is reset by an administrator.
                </span>
              </label>
              <div style={honeypotStyle} aria-hidden="true">
                <label>
                  Company
                  <input type="text" name="company" tabIndex={-1} autoComplete="off" value={company} onChange={(e) => setCompany(e.target.value)} />
                </label>
              </div>

              {error && (
                <p className="sans" style={{ margin: '0 0 14px', color: '#d98b84', fontSize: '0.85rem', textAlign: 'center' }}>
                  {error}
                </p>
              )}

              <button type="submit" disabled={busy} className="btn btn-primary" style={{ display: 'block', width: '100%', borderRadius: 8, padding: 12, textAlign: 'center' }}>
                {busy ? 'Creating…' : 'Create account'}
              </button>
            </form>
          )}

          {avail.sso && providers.length > 0 && (
            <div style={{ marginTop: avail.password ? 20 : 0 }}>
              {avail.password && (
                <div style={{ display: 'flex', alignItems: 'center', gap: 12, margin: '0 0 16px', color: 'var(--dim)' }}>
                  <span style={{ flex: 1, height: 1, background: 'var(--line)' }} />
                  <span className="sans" style={{ fontSize: '0.72rem', letterSpacing: '0.14em', textTransform: 'uppercase' }}>or</span>
                  <span style={{ flex: 1, height: 1, background: 'var(--line)' }} />
                </div>
              )}
              <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
                {providers.map((p) => (
                  <button key={p.id} type="button" onClick={() => startSso(p)} className="btn" style={ssoBtnStyle}>
                    <span style={{ display: 'inline-flex', width: 18, height: 18 }}>
                      <ProviderIcon icon={p.icon} size={18} />
                    </span>
                    Sign up with {p.name}
                  </button>
                ))}
              </div>
            </div>
          )}
        </>
      )}
    </PlayerShell>
  )
}

const ssoBtnStyle = {
  display: 'flex',
  alignItems: 'center',
  justifyContent: 'center',
  gap: 10,
  width: '100%',
  borderRadius: 8,
  padding: 11,
  border: '1px solid var(--line)',
  background: 'rgba(255,255,255,0.04)',
  color: 'var(--ink)',
}
