import { h, mount } from '../dom'
import { api } from '../api'
import { getBaseUrl, setBaseUrl, DEFAULT_BASE_URL } from '../config'
import { loginAs } from '../store'
import { showToast } from '../toast'

type Mode = 'join' | 'create'

export function renderJoin(root: HTMLElement, rerender: () => void): void {
  let _mode: Mode = 'join'
  const getMode = (): Mode => _mode

  const nameInput = h('input', { class: 'app-input', placeholder: 'Terminale S2' })
  const levelInput = h('input', { class: 'app-input', placeholder: 'Lycée' })
  const codeInput = h('input', { class: 'app-input', placeholder: 'TERMS2', autocomplete: 'off' })
  const nicknameInput = h('input', { class: 'app-input', placeholder: 'Votre pseudo' })
  const serverInput = h('input', {
    class: 'app-input',
    placeholder: DEFAULT_BASE_URL,
    value: getBaseUrl(),
    autocomplete: 'off',
    inputMode: 'url',
  })

  // Wrappers pour toggle display
  const codeWrap = h('div', {})
  const nameWrap = h('div', {})
  const levelWrap = h('div', {})

  const errorBox = h('p', {
    style: 'display:none;font-size:12px;font-weight:700;color:#FB7185;background:color-mix(in srgb,var(--red) 10%,transparent);border:1px solid color-mix(in srgb,var(--red) 25%,transparent);border-radius:10px;padding:8px 12px',
  })
  const submitBtn = h('button', { class: 'btn-primary', style: 'width:100%' })
  const toggleBtn = h('button', {
    style: 'width:100%;font-size:12px;font-weight:900;color:var(--blue2);padding:10px;background:none;border:0;cursor:pointer',
  })

  const showError = (message: string): void => {
    errorBox.textContent = message
    errorBox.style.display = 'block'
  }

  const renderMode = (): void => {
    const create = getMode() === 'create'
    submitBtn.replaceChildren(create ? 'Créer la classe' : 'Rejoindre la classe')
    toggleBtn.replaceChildren(create ? 'Déjà un code ? Rejoindre' : 'Créer une nouvelle classe')
    nameWrap.style.display = create ? '' : 'none'
    levelWrap.style.display = create ? '' : 'none'
    codeWrap.style.display = create ? 'none' : ''
    errorBox.style.display = 'none'
  }

  const submit = async (): Promise<void> => {
    const nickname = nicknameInput.value.trim()
    if (!nickname) { showError('Choisissez un pseudo.'); return }
    setBaseUrl(serverInput.value.trim().replace(/\/+$/, '') || DEFAULT_BASE_URL)

    submitBtn.disabled = true
    submitBtn.style.opacity = '0.6'
    try {
      if (getMode() === 'create') {
        const name = nameInput.value.trim()
        if (name.length < 2) { showError('Nom trop court.'); submitBtn.disabled = false; submitBtn.style.opacity = '1'; return }
        const result = await api.createClass({ name, level: levelInput.value.trim() || null, nickname })
        showToast(`Classe créée — code ${result.code}`, 'success')
        await loginAs(result.token, { member: result.member, klass: result.klass })
      } else {
        const code = codeInput.value.trim()
        if (!code) { showError('Entrez le code.'); submitBtn.disabled = false; submitBtn.style.opacity = '1'; return }
        const result = await api.joinClass({ code, nickname })
        await loginAs(result.token, { member: result.member, klass: result.klass })
      }
      rerender()
    } catch (error) {
      showError(error instanceof Error ? error.message : 'Connexion impossible')
      submitBtn.disabled = false
      submitBtn.style.opacity = '1'
    }
  }

  submitBtn.addEventListener('click', submit)
  toggleBtn.addEventListener('click', () => { _mode = _mode === 'join' ? 'create' : 'join'; renderMode() })
  codeInput.addEventListener('keydown', (e) => { if (e.key === 'Enter') submit() })
  nicknameInput.addEventListener('keydown', (e) => { if (e.key === 'Enter') submit() })
  codeInput.addEventListener('input', () => { codeInput.value = codeInput.value.toUpperCase() })

  renderMode()

  const field = (label: string, control: HTMLElement, hint?: string): HTMLElement =>
    h('div', {},
      h('span', { class: 'app-label' }, label),
      control,
      hint ? h('span', { style: 'display:block;font-size:10px;color:var(--muted);font-weight:700;margin-top:4px' }, hint) : null,
    )

  // Remplir les wrappers
  codeWrap.append(field('Code de classe', codeInput, 'Demander le code à l’admin.'))
  nameWrap.append(field('Nom de la classe', nameInput))
  levelWrap.append(field('Niveau (optionnel)', levelInput))

  mount(
    root,
    h('div', { style: 'display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:70vh;padding:0 24px' },
      h('div', { class: 'app-mark paper-grid', style: 'width:80px;height:80px;border-radius:24px;margin-bottom:24px' },
        h('div', { style: 'font-family:\"Comic Sans MS\",\"Bradley Hand\",cursive;color:#EF4444;font-size:60px;font-weight:900;font-style:italic;line-height:80px;text-align:center;transform:rotate(-8deg)' }, '0'),
      ),
      h('h1', { style: 'font-size:24px;font-weight:700;color:var(--text);text-align:center;font-family:Fredoka,sans-serif' }, 'Météo Exam'),
      h('p', { style: 'font-size:12px;font-weight:700;color:var(--blue2);margin:6px 0 32px;text-align:center' },
        'Le ciel de tes évaluations.'),
      h('div', { style: 'width:100%;display:grid;gap:16px' },
        field('Votre pseudo', nicknameInput),
        codeWrap,
        nameWrap,
        levelWrap,
        field('Serveur', serverInput, 'Émulateur : 10.0.2.2:8787 · Réseau : IP du PC'),
        errorBox,
        submitBtn,
        toggleBtn,
      ),
      h('p', { style: 'font-size:10px;color:var(--muted);font-weight:800;margin-top:32px;text-align:center' },
        'L’admin crée le calendrier. Les élèves le consultent.'),
    ),
  )
}