/**
 * WiFi Portal Engine
 * Handles the guest payment & authorization flow.
 * Requires window.PORTAL to be set before this script loads.
 */
(function () {
  'use strict';

  const P = window.PORTAL;
  if (!P) return;

  // ── DOM refs ──────────────────────────────────────────────────────────────
  const $ = id => document.getElementById(id);

  const screens = {
    select:   $('screen-select'),
    waiting:  $('screen-waiting'),
    code:     $('screen-code'),
    success:  $('screen-success'),
  };

  function showScreen(name) {
    Object.values(screens).forEach(s => s && s.classList.remove('active'));
    if (screens[name]) screens[name].classList.add('active');
  }

  function showError(elId, msg) {
    const el = $(elId);
    if (!el) return;
    el.textContent = msg;
    el.classList.add('show');
  }

  function clearError(elId) {
    const el = $(elId);
    if (el) { el.textContent = ''; el.classList.remove('show'); }
  }

  async function readJsonSafe(res) {
    const text = await res.text();
    try {
      return text ? JSON.parse(text) : {};
    } catch {
      return { error: text || 'Unexpected server response' };
    }
  }

  // ── State ─────────────────────────────────────────────────────────────────
  let selectedPlanId    = null;
  let selectedPlanPrice = null;
  let selectedPlanIsPromo = false;
  let pollTimer         = null;
  let currentReference  = null;
  let purchaseInFlight  = false;

  // ── Plan selection ────────────────────────────────────────────────────────
  const planRadios = document.querySelectorAll('input[name="plan"]');
  const payBtn     = $('pay-btn');
  const phoneInput = $('phone-input');

  function isPhoneValid() {
    return phoneInput?.value?.replace(/\D/g, '').length >= 9;
  }

  function updatePayBtn() {
    if (!payBtn) return;
    if (selectedPlanId && isPhoneValid()) {
      payBtn.textContent = selectedPlanIsPromo
        ? 'Claim promo'
        : `Pay ${parseInt(selectedPlanPrice).toLocaleString()} TZS & Connect`;
      payBtn.disabled = false;
    } else if (selectedPlanId) {
      payBtn.textContent = 'Enter your phone number';
      payBtn.disabled = true;
    } else {
      payBtn.textContent = 'Select a plan to continue';
      payBtn.disabled = true;
    }
  }

  planRadios.forEach(radio => {
    radio.addEventListener('change', () => {
      selectedPlanId    = radio.dataset.planId;
      selectedPlanPrice = radio.dataset.planPrice;
      selectedPlanIsPromo = radio.dataset.planPromo === '1' || Number(selectedPlanPrice) === 0;
      updatePayBtn();
    });
  });

  if (phoneInput) {
    phoneInput.addEventListener('input', () => {
      // Auto-format TZ numbers: 0765 123 456 (groups 4-3-3)
      let digits = phoneInput.value.replace(/\D/g, '').slice(0, 10);
      if (digits.length > 7)
        digits = digits.slice(0, 4) + ' ' + digits.slice(4, 7) + ' ' + digits.slice(7);
      else if (digits.length > 4)
        digits = digits.slice(0, 4) + ' ' + digits.slice(4);
      phoneInput.value = digits;
      updatePayBtn();
    });
  }

  // ── Pay button ────────────────────────────────────────────────────────────
  if (payBtn) {
    payBtn.addEventListener('click', async () => {
      if (purchaseInFlight) return;
      clearError('select-error');
      const phone = phoneInput?.value?.trim();
      if (!selectedPlanId) return showError('select-error', 'Please select a plan.');
      if (!phone || phone.replace(/\D/g, '').length < 9) {
        return showError('select-error', 'Enter a valid phone number.');
      }
      if (selectedPlanIsPromo && !P.clientMac) {
        return showError('select-error', 'Open this portal from the WiFi login page on the device you want to connect.');
      }

      purchaseInFlight = true;
      payBtn.disabled = true;
      showScreen('waiting');

      try {
        const endpoint = selectedPlanIsPromo ? 'promo' : 'purchase';
        const payload = selectedPlanIsPromo
          ? { planId: selectedPlanId, phone, clientMac: P.clientMac }
          : { planId: selectedPlanId, phone };
        const res = await fetch(`/portal/${P.siteId}/${endpoint}`, {
          method:  'POST',
          headers: { 'Content-Type': 'application/json' },
          body:    JSON.stringify(payload),
        });
        const data = await readJsonSafe(res);

        if (selectedPlanIsPromo && res.ok && data.code) {
          purchaseInFlight = false;
          payBtn.disabled = false;
          showCodeEntry(data.code);
          return;
        }

        if (!res.ok || !data.reference) {
          showScreen('select');
          purchaseInFlight = false;
          payBtn.disabled = false;
          return showError('select-error', data.error || (selectedPlanIsPromo ? 'Could not issue promo code. Please ask the attendant.' : 'Purchase failed. Try again.'));
        }

        currentReference = data.reference;
        startPolling(data.reference);
      } catch (err) {
        showScreen('select');
        purchaseInFlight = false;
        payBtn.disabled = false;
        showError('select-error', 'Network error. Please try again.');
      }
    });
  }

  // ── Polling ───────────────────────────────────────────────────────────────
  function startPolling(reference) {
    let attempts = 0;
    const MAX    = 100; // ~5 min at 3s

    clearInterval(pollTimer);
    pollTimer = setInterval(async () => {
      attempts++;
      if (attempts > MAX) {
        clearInterval(pollTimer);
        purchaseInFlight = false;
        showScreen('select');
        if (payBtn) payBtn.disabled = false;
        showError('select-error', 'Payment timed out. Please try again.');
        return;
      }

      try {
        const res  = await fetch(`/portal/${P.siteId}/check/${reference}`);
        const data = await res.json();

        if (data.status === 'paid' && data.code) {
          clearInterval(pollTimer);
          await authorizeWithCode(data.code);
        } else if (data.status === 'failed') {
          clearInterval(pollTimer);
          purchaseInFlight = false;
          showScreen('select');
          if (payBtn) payBtn.disabled = false;
          showError('select-error', 'Payment was declined. Please try again.');
        }
      } catch { /* network blip — keep polling */ }
    }, 3000);
  }

  // Cancel button
  const cancelBtn = $('cancel-btn');
  if (cancelBtn) {
    cancelBtn.addEventListener('click', () => {
      clearInterval(pollTimer);
      purchaseInFlight = false;
      showScreen('select');
      if (payBtn) payBtn.disabled = false;
    });
  }

  // ── Auth with code ────────────────────────────────────────────────────────
  async function authorizeWithCode(code) {
    if (!P.clientMac) {
      purchaseInFlight = false;
      showScreen('code');
      showError('code-error', 'This page was opened outside the WiFi login flow. Reopen the hotspot portal on the device that is joining the WiFi.');
      return;
    }

    await authorizeViaServer(code, 'select-error');
  }

  // Call WiFiBiz's /portal/:siteId/omada-auth directly. WiFiBiz validates the
  // voucher with Omada server-side and records the session in one step — no
  // fragile browser→Omada redirect hop that can silently fail and leave
  // WiFiBiz unaware the guest connected.
  async function authorizeViaServer(code, errorElId) {
    showScreen('waiting');
    const waitingText = $('waiting-text');
    if (waitingText) waitingText.textContent = 'Connecting your device...';

    try {
      const res = await fetch(`/portal/${P.siteId}/omada-auth`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(omadaAuthPayload(code)),
      });
      const data = await readJsonSafe(res);

      if (res.ok && data.success) {
        purchaseInFlight = false;
        showSuccess(data);
        // Redirect to Omada's landing URL immediately — this is what makes the
        // captive portal detect connectivity and close the login screen. Don't
        // wait; the guest is already authorized.
        const target = data.landingUrl || (P.originUrl && /^https?:\/\//i.test(P.originUrl) ? P.originUrl : null);
        if (target) {
          window.location.href = target;
        }
        return;
      }

      // Server-side auth failed — fall back to the redirect approach as a
      // last resort so the guest isn't stuck.
      const msg = data.error || data.msg || 'Could not validate the voucher.';
      showError(errorElId, msg + ' Retrying via Omada...');
      setTimeout(() => redirectToOmadaAuth(code, errorElId), 2000);
    } catch (err) {
      // Network error talking to WiFiBiz — fall back to redirect.
      redirectToOmadaAuth(code, errorElId);
    }
  }

  function showSuccess(data) {
    const codeEl = $('success-code');
    if (codeEl) codeEl.textContent = data.code || '—';

    const metaEl = $('success-meta');
    if (metaEl) {
      const hours = data.expiresIn ? Math.ceil(data.expiresIn / 3600) : '?';
      const validFor = hours === '?'
        ? 'Available'
        : hours < 24
          ? `${hours} ${hours === 1 ? 'hour' : 'hours'}`
          : `${Math.ceil(hours / 24)} ${Math.ceil(hours / 24) === 1 ? 'day' : 'days'}`;
      metaEl.innerHTML = `
        <div class="meta-row"><span class="meta-key">Time left</span><strong class="meta-val">${validFor}</strong></div>
        <div class="meta-row"><span class="meta-key">Download</span><strong class="meta-val">${data.speedDown || 'Active'}</strong></div>
        <div class="meta-row"><span class="meta-key">Upload</span><strong class="meta-val">${data.speedUp || 'Active'}</strong></div>
        <div class="meta-row"><span class="meta-key">Reconnect</span><strong class="meta-val">Use this code</strong></div>
      `;
    }
    showScreen('success');
  }

  const successCopyBtn = $('success-copy-btn');
  if (successCopyBtn) {
    successCopyBtn.addEventListener('click', async () => {
      const code = $('success-code')?.textContent?.trim();
      if (!code || code === '—') return;
      try {
        await navigator.clipboard.writeText(code);
        successCopyBtn.textContent = 'Copied';
        setTimeout(() => { successCopyBtn.textContent = 'Copy code'; }, 1800);
      } catch {
        successCopyBtn.textContent = 'Select code';
        setTimeout(() => { successCopyBtn.textContent = 'Copy code'; }, 1800);
      }
    });
  }

  const successContinueBtn = $('success-continue-btn');
  if (successContinueBtn) {
    successContinueBtn.addEventListener('click', () => {
      const target = P.originUrl && /^https?:\/\//i.test(P.originUrl) ? P.originUrl : 'http://example.com';
      window.location.href = target;
    });
  }

  function omadaAuthPayload(code) {
    return {
      code,
      clientMac: P.clientMac,
      apMac: P.apMac,
      gatewayMac: P.gatewayMac,
      ssidName: P.ssidName,
      radioId: P.radioId,
      vid: P.vid,
      originUrl: P.originUrl,
    };
  }

  function redirectToOmadaAuth(code, errorElId) {
    const returnUrl = P.omadaReturnUrl;
    if (!returnUrl) {
      showError(errorElId, 'Open this portal from the WiFi login page, then enter the voucher again.');
      return;
    }

    try {
      const url = new URL(returnUrl, window.location.href);
      url.searchParams.set('authCode', code);
      url.searchParams.set('authSource', 'wifibiz');
      window.location.href = url.toString();
    } catch {
      showError(errorElId, 'Could not return to Omada to validate the voucher. Reopen the WiFi login page.');
    }
  }

  // ── Code entry (reconnect) ────────────────────────────────────────────────
  const showCodeEntryLink = $('show-code-entry');
  const showPlansLink     = $('show-plans');
  const codeInput         = $('code-input');
  const codeSubmitBtn     = $('code-submit-btn');

  if (showCodeEntryLink) {
    showCodeEntryLink.addEventListener('click', () => {
      clearError('code-error');
      showScreen('code');
    });
  }
  if (showPlansLink) {
    showPlansLink.addEventListener('click', () => showScreen('select'));
  }

  function showCodeEntry(prefill) {
    if (codeInput && prefill) codeInput.value = prefill;
    clearError('code-error');
    showScreen('code');
  }

  if (codeInput) {
    codeInput.addEventListener('input', () => {
      codeInput.value = codeInput.value.replace(/[^a-zA-Z0-9]/g, '').slice(0, 32);
    });
  }

  if (codeSubmitBtn) {
    codeSubmitBtn.addEventListener('click', async () => {
      clearError('code-error');
      const code = codeInput?.value?.trim();
      if (!code || code.length < 6) {
        return showError('code-error', 'Enter the voucher code exactly as shown.');
      }
      if (!P.clientMac) {
        return showError('code-error', 'Open this portal from the WiFi login page on the device you want to connect.');
      }

      codeSubmitBtn.disabled = true;
      codeSubmitBtn.textContent = 'Connecting...';

      try {
        await authorizeViaServer(code, 'code-error');
      } catch {
        showError('code-error', 'Could not connect. Please try again.');
      } finally {
        codeSubmitBtn.disabled = false;
        codeSubmitBtn.textContent = 'Connect';
      }
    });
  }

  // If clientMac is missing (portal opened in browser), warn in console only
  if (!P.clientMac) {
    console.warn('[WiFi Portal] No clientMac — running in preview mode');
  }

})();