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

const inputClass =
  'w-full bg-slate-900/80 border border-slate-700/80 rounded-xl px-3.5 py-3 text-sm text-slate-100 placeholder-slate-500 focus:outline-none focus:border-sky-500 transition-colors'

const labelClass = 'block text-[10px] font-black uppercase tracking-wider text-slate-500 mb-1.5'

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

  const errorBox = h('p', { class: 'hidden text-xs font-bold text-rose-300 bg-rose-500/10 border border-rose-500/25 rounded-xl px-3 py-2' })
  const codeHint = h('p', { class: 'hidden text-xs text-slate-500 font-semibold' })
  const submitBtn = h('button', {
    class: 'w-full bg-sky-500 text-slate-950 text-sm font-extrabold py-3.5 rounded-xl active:scale-[0.98] transition-transform',
  })
  const toggleBtn = h('button', {
    class: 'w-full text-xs font-black text-sky-400 py-2.5 active:scale-95 transition-transform',
  })

  const showError = (message: string): void => {
    errorBox.textContent = message
    errorBox.classList.remove('hidden')
  }

  const renderMode = (): void => {
    const create = getMode() === 'create'
    submitBtn.replaceChildren(
      create ? 'Créer la classe' : 'Rejoindre la classe',
    )
    toggleBtn.replaceChildren(
      create ? 'Déjà un code ? Rejoindre une classe' : 'Créer une nouvelle classe',
    )
    codeHint.classList.toggle('hidden', create)
    nameInput.parentElement?.classList.toggle('hidden', !create)
    levelInput.parentElement?.classList.toggle('hidden', !create)
    codeInput.parentElement?.classList.toggle('hidden', create)
    errorBox.classList.add('hidden')
  }

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

    submitBtn.disabled = true
    submitBtn.classList.add('opacity-60')
    try {
      if (getMode() === 'create') {
        const name = nameInput.value.trim()
        if (name.length < 2) {
          showError('Nom de classe trop court.')
          submitBtn.disabled = false
          submitBtn.classList.remove('opacity-60')
          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 de classe.')
          submitBtn.disabled = false
          submitBtn.classList.remove('opacity-60')
          return
        }
        const result = await api.joinClass({ code, nickname })
        await loginAs(result.token, { member: result.member, klass: result.klass })
      }
      rerender()
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Connexion impossible'
      showError(message)
      submitBtn.disabled = false
      submitBtn.classList.remove('opacity-60')
    }
  }

  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()

  mount(
    root,
    h(
      'div',
      { class: 'flex flex-col items-center justify-center min-h-[70vh] px-6' },
      h(
        'div',
        { class: 'w-20 h-20 rounded-[1.75rem] bg-gradient-to-tr from-sky-400 to-indigo-500 flex items-center justify-center text-white font-black text-3xl shadow-float mb-6' },
        'ME',
      ),
      h('h1', { class: 'text-2xl font-black text-white text-center tracking-tight' }, 'Météo Exam'),
      h('p', { class: 'text-xs font-bold text-sky-400 mt-1 mb-8 text-center' },
        'Le calendrier des évaluations, en bulletin météo.'),
      h(
        'div',
        { class: 'w-full space-y-4' },
        field('Votre pseudo', nicknameInput),
        getMode() === 'join' ? field('Code de classe', codeInput) : null,
        getMode() === 'join'
          ? h('p', { class: 'text-[11px] text-slate-500 font-semibold -mt-2' },
              'Demander le code à l’admin de la classe (ex. TERMS2).')
          : null,
        getMode() === 'create' ? field('Nom de la classe', nameInput) : null,
        getMode() === 'create' ? field('Niveau (optionnel)', levelInput) : null,
        field('Serveur', serverInput, 'Adresse de l’API. Emulateur Android : 10.0.2.2:8787'),
        errorBox,
        submitBtn,
        toggleBtn,
        codeHint,
      ),
      h(
        'p',
        { class: 'text-[10px] text-slate-600 font-semibold mt-8 text-center' },
        'L’admin de la classe crée le calendrier. Les élèves le consultent et participent au radar.',
      ),
    ),
  )

  function field(label: string, control: HTMLElement, hint?: string): HTMLElement {
    return h(
      'label',
      { class: 'block' },
      h('span', { class: labelClass }, label),
      control,
      hint ? h('span', { class: 'block text-[10px] text-slate-600 font-semibold mt-1' }, hint) : null,
    )
  }
}