import {updateState} from './version.mjs';

const $ = id => document.getElementById(id);
const EXTENSION_ID = 'kiolgjoohhgdohcafgelhikpgkbmckbg';
let generation = 0, currentOwner, currentState, dragging = false, juiceBusy = false;
const masterItems = new Map();
const openVaults = new Set();

$('signOutButton').hidden = true;
$('signOutButton').textContent = 'Sign out';
$('userList').innerHTML = `
  <div id="vaultSummary" class="vaultSummary" hidden>
    <span id="extensionState" class="lockIcon" role="img"></span>
    <div><strong id="vaultCount"></strong><div id="extensionHelp" class="hint"></div></div>
  </div>
  <div id="onboarding" class="empty">
    <p id="onboardingHelp"></p>
    <button id="createAccount" class="primary" hidden>Create account</button>
    <button id="getExtension" class="primary" hidden>Get extension</button>
    <button id="updateExtension" hidden>Update available</button>
  </div>
  <div id="vaultItems"></div>`;

function extensionMessage(type, owner, extra = {}) {
  return new Promise(resolve => {
    const timer = setTimeout(() => resolve(null), type === 'persimmons.juice.v1' ? 180000 : 2500);
    try {
      chrome.runtime.sendMessage(EXTENSION_ID, {type, owner, ...extra}, result => {
        const failed = chrome.runtime.lastError;
        clearTimeout(timer);
        resolve(failed ? null : result);
      });
    } catch {
      clearTimeout(timer);
      resolve(null);
    }
  });
}

const extensionStatus = owner => extensionMessage('persimmons.connection.v1', owner);
const extensionInventory = owner => extensionMessage('persimmons.inventory.v1', owner);

async function latestVersion() {
  try {
    const response = await fetch('/assets/version.json', {cache: 'no-store'});
    return response.ok ? (await response.json()).version : null;
  } catch { return null; }
}

// One refresh at a time. Signed in, a pass (session, then the vault index and the vault list, then the extension)
// takes longer than the 1.5 s poll, and each new pass used to make the one in flight bail out before rendering, so
// the vault stayed empty forever. Now a refresh asked for during another runs once more after it (actions, focus),
// and the poll simply skips while one is running.
let refreshing = null, refreshAgain = false;
function refresh() {
  if (refreshing) { refreshAgain = true; return refreshing; }
  refreshing = (async () => {
    try { do { refreshAgain = false; await refreshOnce(); } while (refreshAgain); }
    finally { refreshing = null; }
  })();
  return refreshing;
}

async function refreshOnce() {
  if (dragging || juiceBusy) return;
  const current = ++generation;
  const response = await fetch('/api/session', {credentials: 'same-origin', cache: 'no-store'});
  if (current !== generation) return;
  if (!response.ok && response.status !== 401) throw new Error();

  const signedIn = response.ok;
  const identity = signedIn ? await response.json() : null;
  const owner = identity?.owner || identity?.login?.toLowerCase() || identity?.user?.login?.toLowerCase() || identity?.name?.toLowerCase();
  const [state, latest, vault, named] = await Promise.all([
    extensionStatus(owner),
    latestVersion(),
    signedIn
      ? fetch('/api/vault-index', {credentials: 'same-origin', cache: 'no-store'})
          .then(async response => response.ok ? response.json() : null)
          .catch(() => null)
      : Promise.resolve(null),
    signedIn ? fetch('/api/vaults', {credentials: 'same-origin', cache: 'no-store'})
      .then(async response => response.ok ? response.json() : null).catch(() => null) : null
  ]);
  if (current !== generation) return;
  const decrypted = state?.unlocked ? await extensionInventory(owner) : null;
  if (current !== generation || dragging || juiceBusy) return;

  $('signInLink').hidden = signedIn;
  $('signOutButton').hidden = !signedIn;
  $('addCredential').hidden = !signedIn || !state?.connected || !state?.initialized;
  $('userState').hidden = true;
  $('userState').textContent = '';
  const displayName = identity?.name || identity?.login || identity?.user?.login || owner || '';
  $('userIdentity').textContent = signedIn ? 'Signed in as ' + displayName : '';
  currentOwner = owner; currentState = state;
  if (!await renderVaults(signedIn, named, current)) return;
  if (current !== generation || dragging || juiceBusy) return;

  const stale = !!state && updateState(state.version, latest) === 'Update available';
  $('updateExtension').hidden = !signedIn || !stale;
  $('createAccount').hidden = signedIn;
  $('getExtension').hidden = !signedIn || !!state;

  if (!signedIn) {
    $('vaultSummary').hidden = true;
    $('onboarding').hidden = false;
    $('onboardingHelp').textContent = 'Sign in or create an account to use your encrypted vault.';
    $('vaultItems').replaceChildren();
    return;
  }

  const linked = state?.connected === true;
  const ready = linked && state.initialized;
  $('vaultSummary').hidden = !ready;
  $('onboarding').hidden = ready;
  $('extensionState').textContent = state?.unlocked ? '🔓' : '🔒';
  $('extensionState').ariaLabel = state?.unlocked ? 'Vault unlocked' : 'Vault locked';
  $('extensionState').title = $('extensionState').ariaLabel;
  $('extensionHelp').textContent = state?.unlocked ? 'Drag a credential to a named vault to create Juice.' : 'Open 🍊 to unlock. Choose a timed auto-lock in Settings for Juice.';
  $('onboardingHelp').textContent =
    !state ? 'Install Persimmons in this browser.' :
    !linked ? 'Open 🍊 and choose Link vault.' :
    !state.initialized ? 'Open 🍊 and choose a vault passphrase.' :
    '';

  const inventory = $('vaultItems');
  inventory.replaceChildren();
  const serverItems = Array.isArray(vault?.items) ? vault.items : null;
  const extensionItems = Array.isArray(decrypted?.items) ? decrypted.items : null;
  const sourceItems = serverItems || extensionItems;
  const vaultAvailable = Array.isArray(sourceItems);
  const items = vaultAvailable ? sourceItems.filter(item => {
    try { return /^[0-9a-f]{32}$/.test(item.id) && new URL(item.origin).protocol === 'https:'; }
    catch { return false; }
  }) : [];
  $('vaultCount').textContent = !vaultAvailable ? 'Credential list unavailable' :
    items.length === 1 ? '1 saved credential' : items.length + ' saved credentials';
  masterItems.clear();
  for (const item of items) masterItems.set(item.id, item);
  if (!items.length) {
    const empty = document.createElement('div');
    empty.className = 'empty';
    empty.textContent = vaultAvailable ?
      'No saved credentials yet. Add one from the site where you use it.' :
      'Credentials could not be loaded. The page will retry automatically.';
    inventory.append(empty);
  } else {
    const usernames = new Map((decrypted?.items || []).map(item => [item.id, item.username]));
    for (const item of items) {
      const url = new URL(item.origin);
      const username = item.username || usernames.get(item.id);
      const card = document.createElement('article');
      card.className = 'connection';
      card.dataset.sourceId = item.id;
      card.draggable = !!(state?.connected && state?.initialized && state?.unlocked);
      card.ondragstart = event => {
        dragging = true;
        event.dataTransfer.effectAllowed = 'copy';
        event.dataTransfer.setData('application/x-persimmons-source', item.id);
      };
      card.ondragend = () => { dragging = false; };

      const top = document.createElement('div');
      top.className = 'cardtop';
      const description = document.createElement('div');
      const name = document.createElement('div');
      name.className = 'title';
      name.textContent = '🔑 ' + (username || url.hostname);
      const label = document.createElement('div');
      label.className = 'account';
      label.textContent = username ? 'Website credential' : 'Credential · ID ' + item.id.slice(-6).toUpperCase();
      description.append(name, label);
      const status = document.createElement('span');
      status.className = 'badge';
      status.textContent = state?.unlocked ? '🔓' : '🔒';
      status.ariaLabel = state?.unlocked ? 'Vault unlocked' : 'Vault locked';
      status.title = status.ariaLabel;
      top.append(description, status);

      const source = document.createElement('div');
      source.className = 'credentialSource';
      const sourceLabel = document.createElement('span');
      sourceLabel.textContent = 'Source';
      const sourceLink = document.createElement('a');
      sourceLink.href = item.origin;
      sourceLink.target = '_blank';
      sourceLink.rel = 'noreferrer';
      sourceLink.textContent = item.origin;
      source.append(sourceLabel, sourceLink);

      const mask = document.createElement('div');
      mask.className = 'mask';
      mask.textContent = '••••••••••••••••';
      const capability = document.createElement('span');
      capability.className = 'scope';
      capability.textContent = 'Fill only on ' + url.hostname;
      const metadata = document.createElement('div');
      metadata.className = 'meta credentialId';
      metadata.textContent = 'ID ' + item.id.slice(-6);

      const actions = document.createElement('div');
      actions.className = 'actions';
      const open = document.createElement('a');
      open.className = 'buttonLink';
      open.href = item.origin;
      open.target = '_blank';
      open.rel = 'noreferrer';
      open.textContent = 'Open site';
      const remove = document.createElement('button');
      remove.type = 'button';
      remove.className = 'danger';
      remove.textContent = 'Delete';
      remove.onclick = async () => {
        if (!confirm('Delete this saved credential? This cannot be undone.')) return;
        remove.disabled = true;
        try {
          const deleted = await fetch('/api/vault-index/' + item.id, {
            method: 'DELETE', credentials: 'same-origin', headers: {'X-Requested-With': 'Persimmons'}
          });
          if (!deleted.ok) throw new Error();
          await refresh();
        } catch {
          remove.disabled = false;
          $('userState').hidden = false;
          $('userState').textContent = 'Delete unavailable. Retry shortly.';
        }
      };
      actions.append(open, remove);
      card.append(top, source, mask, capability, metadata, actions);
      inventory.append(card);
    }
  }
}

async function renderVaults(signedIn, result, current) {
  const contents = new Map();
  if (signedIn && Array.isArray(result?.vaults)) await Promise.all(result.vaults.map(async vault => {
    try { contents.set(vault.id, await pageJuice('list', vault)); } catch {}
  }));
  // Resolve all network reads before touching cards. Never replace a drag target mid-gesture.
  if (current !== generation || dragging || juiceBusy) return false;
  $('namedVaults').hidden = !signedIn;
  const list = $('namedVaultList');
  list.replaceChildren();
  if (!signedIn) return true;
  if (!Array.isArray(result?.vaults) || !result.vaults.length) {
    const empty = document.createElement('p');
    empty.className = 'empty';
    empty.textContent = Array.isArray(result?.vaults) ? 'No named vaults yet. Create a private vault when you need one.' : 'Vaults could not be loaded. Retrying shortly.';
    list.append(empty);
    return true;
  }
  for (const vault of result.vaults) {
    const card = document.createElement('article');
    card.className = 'connection namedVaultCard';
    card.dataset.vaultId = vault.id;
    card.ondragover = event => {
      if (!currentState?.connected || !currentState?.initialized || !currentState?.unlocked ||
          !event.dataTransfer.types.includes('application/x-persimmons-source')) return;
      event.preventDefault(); event.dataTransfer.dropEffect = 'copy'; card.classList.add('juiceHover');
    };
    card.ondragleave = event => { if (!card.contains(event.relatedTarget)) card.classList.remove('juiceHover'); };
    card.ondrop = event => {
      event.preventDefault(); dragging = false; card.classList.remove('juiceHover');
      const item = masterItems.get(event.dataTransfer.getData('application/x-persimmons-source'));
      if (item && currentState?.connected && currentState?.initialized && currentState?.unlocked) openJuice(item, vault);
    };


    const top = document.createElement('div');
    top.className = 'cardtop';
    const description = document.createElement('div');
    const name = document.createElement('div');
    name.className = 'title';
    name.textContent = '📦 ' + vault.name;
    const owner = document.createElement('div');
    owner.className = 'account';
    owner.textContent = vault.owner + '/' + vault.name;
    description.append(name, owner);

    const badge = document.createElement('span');
    badge.className = 'badge active';
    badge.textContent = 'private ✓';
    top.append(description, badge);

    const meta = document.createElement('div');
    meta.className = 'namedVaultMeta';
    const state = document.createElement('span');
    state.className = 'namedVaultBadge';
    const juiceCount = contents.get(vault.id)?.items.length;
    state.textContent = juiceCount ? juiceCount + ' Juice' : vault.empty ? 'Empty vault' : 'Vault';
    meta.append(state);

    const actions = document.createElement('div');
    actions.className = 'namedVaultActions';
    const open = document.createElement('button');
    open.type = 'button';
    open.textContent = 'Open vault';

    const body = document.createElement('div');
    body.className = 'namedVaultBody';
    body.hidden = !openVaults.has(vault.owner + '/' + vault.name);
    const bodyTitle = document.createElement('strong');
    bodyTitle.textContent = vault.name;
    const bodyText = document.createElement('span');
    bodyText.textContent = 'Drop an unlocked Master credential here to create Juice.';
    body.append(bodyTitle, bodyText);
    try {
      const result = contents.get(vault.id);
      for (const item of result.items) body.append(juiceCard(item, vault));
      if (result.items.length) bodyText.remove();
    } catch { bodyText.textContent = 'Juice metadata unavailable. Retry shortly.'; }


    open.textContent = body.hidden ? 'Open vault' : 'Close vault';
    open.onclick = () => {
      const key = vault.owner + '/' + vault.name;
      if (openVaults.has(key)) openVaults.delete(key);
      else openVaults.add(key);
      body.hidden = !openVaults.has(key);
      open.textContent = body.hidden ? 'Open vault' : 'Close vault';
    };
    actions.append(open);

    card.append(top, meta, actions, body);
    list.append(card);
  }
  return true;
}

async function pageJuice(operation, vault, extra = {}) {
  const response = await fetch('/api/juice/' + operation, {method: 'POST', credentials: 'same-origin', cache: 'no-store',
    headers: {'Content-Type': 'application/json', 'X-Vault-Owner': currentOwner, 'X-Requested-With': 'Persimmons'},
    body: JSON.stringify({target: {id: vault.id, name: vault.name}, ...extra})});
  if (!response.ok) throw new Error();
  return response.json();
}

function juiceCard(item, vault) {
  const card = document.createElement('article');
  card.className = 'juiceCard'; card.dataset.juiceId = item.id;
  const title = document.createElement('strong');
  title.textContent = '💧 Gitea · ' + item.source_username + '@' + new URL(item.source_origin).hostname;
  const details = document.createElement('p');
  details.textContent = item.scopes.join(', ') + ' · ' + item.status + ' · ' + item.created_at;
  const boundary = document.createElement('p');
  boundary.textContent = 'Provider API-class scopes; not restricted to this vault or a single repository.';
  const status = document.createElement('p');
  status.textContent = 'Target secret: ' + item.target_status + ' · Provider token: ' + item.provider_status;
  if (item.status === 'partial-failure' || item.status === 'pending') status.textContent += ' · ANDON: cleanup may be required. Retry Revoke.';
  const actions = document.createElement('div'); actions.className = 'actions';
  for (const action of ['rotate', 'revoke']) {
    const button = document.createElement('button'); button.textContent = action === 'rotate' ? 'Rotate' : 'Revoke';
    button.disabled = action === 'rotate' && (item.status !== 'active' || !currentState?.unlocked);
    if (action === 'revoke' && item.status === 'revoked') button.disabled = true;
    button.onclick = async () => {
      juiceBusy = true; button.disabled = true;
      try {
        if (action === 'revoke') await pageJuice('remove', vault, {id: item.id});
        const result = await extensionMessage('persimmons.juice.v1', currentOwner,
          {action, target: {id: vault.id, name: vault.name}, id: item.id});
        if (!result && action === 'revoke') {
          status.textContent = 'ANDON: Target secret removed; provider revocation unconfirmed. Connect and unlock the source to retry.';
        } else if (!result?.ok) {
          status.textContent = (action === 'revoke' ? 'ANDON: Target secret removed; provider cleanup unconfirmed. ' : '') +
            (result?.message || 'ANDON: Operation outcome unknown. Refresh and inspect Juice before retrying.');
        } else {
          openVaults.add(vault.owner + '/' + vault.name);
          juiceBusy = false; await refresh();
        }
      } catch { status.textContent = 'ANDON: Operation outcome unknown. Inspect Juice before retrying.'; }
      finally { juiceBusy = false; button.disabled = false; }
    };
    actions.append(button);
  }
  card.append(title, details, boundary, status, actions);
  return card;
}

function openJuice(item, vault) {
  const dialog = ensureDialog(), body = $('siteModalBody');
  body.replaceChildren(closeButton(dialog));
  const title = document.createElement('h2');
  title.style.cssText = 'font-size:20px;overflow-wrap:anywhere;line-height:1.3';
  title.textContent = 'Juice ' + (item.username || 'credential') + '@' + new URL(item.origin).hostname + ' → ' + vault.name;
  body.append(title);
  if (item.origin !== 'https://teahub.xyz') {
    const note = document.createElement('p'); note.textContent = 'Juice adapter not available yet.'; body.append(note);
  } else {
    const form = document.createElement('form');
    form.innerHTML = `<label>Gitea PAT scopes<select name="scope"><option value="read:repository">Read repositories</option><option value="read:issue">Read issues</option><option value="write:issue">Read and write issues</option></select></label>
      <p class="hint">Scopes apply across the source account’s accessible resources in that API category. They are not limited to this vault or one repository. No automatic expiry.</p>
      <button type="submit" class="primary">Create Juice</button><p role="status"></p>`;
    form.onsubmit = async event => {
      event.preventDefault(); juiceBusy = true; form.querySelector('button').disabled = true;
      const result = await extensionMessage('persimmons.juice.v1', currentOwner, {action: 'create', source_id: item.id,
        target: {id: vault.id, name: vault.name}, policy: {scopes: [form.elements.scope.value]}});
      juiceBusy = false;
      if (result?.ok) {
        openVaults.add(vault.owner + '/' + vault.name); dialog.close(); await refresh();
      } else {
        form.querySelector('[role=status]').textContent = result?.message || 'ANDON: Outcome unknown. Close and inspect Juice before retrying.';
        form.querySelector('button').disabled = false;
      }
    };
    body.append(form);
  }
  dialog.showModal();
}

function openNewVault() {
  const dialog = ensureDialog();
  const body = $('siteModalBody');
  body.replaceChildren(closeButton(dialog));
  const title = document.createElement('h2');
  title.textContent = 'New vault';
  const form = document.createElement('form');
  form.innerHTML = `<label>Vault name<input id="vaultName" name="name" autocomplete="off" maxlength="100" required></label>
    <p class="hint">Creates an empty private vault owned by you. Spaces become hyphens.</p>
    <button type="submit" class="primary">Create vault</button><p id="vaultStatus" role="status"></p>`;
  form.onsubmit = async event => {
    event.preventDefault();
    form.querySelector('button').disabled = true;
    try {
      const response = await fetch('/api/vaults', {method: 'POST', credentials: 'same-origin',
        headers: {'Content-Type': 'application/json', 'X-Requested-With': 'Persimmons'},
        body: JSON.stringify({name: form.querySelector('#vaultName').value})});
      const result = await response.json();
      if (!response.ok) {
        form.querySelector('#vaultStatus').textContent = result.error || 'Vault creation unavailable. Retry shortly.';
        form.querySelector('button').disabled = false;
        return;
      }
      dialog.close();
      await refresh();
    } catch {
      form.querySelector('#vaultStatus').textContent = 'Vault creation unavailable. Refresh the page before retrying.';
      form.querySelector('button').disabled = false;
    }
  };
  body.append(title, form);
  dialog.showModal();
}

function ensureDialog() {
  let dialog = $('siteModal');
  if (dialog) return dialog;
  dialog = document.createElement('dialog');
  dialog.id = 'siteModal';
  dialog.style.cssText = 'border:0;border-radius:16px;padding:0;width:min(460px,calc(100vw - 32px));box-shadow:0 24px 80px rgba(36,26,20,.24)';
  dialog.innerHTML = '<div id="siteModalBody" style="padding:22px;background:#fffdfa"></div>';
  document.body.append(dialog);
  dialog.addEventListener('close', () => refresh().catch(failed));
  return dialog;
}

function closeButton(dialog) {
  const button = document.createElement('button');
  button.type = 'button';
  button.textContent = '×';
  button.setAttribute('aria-label', 'Close');
  button.style.cssText = 'float:right;border:0;background:none;font-size:22px';
  button.onclick = () => dialog.close();
  return button;
}

function openAuth(mode = 'login') {
  const dialog = ensureDialog();
  const body = $('siteModalBody');
  body.replaceChildren(closeButton(dialog));
  const title = document.createElement('h2');
  title.textContent = mode === 'register' ? 'Create account' : 'Sign in';
  const form = document.createElement('form');
  form.autocomplete = 'on';
  form.innerHTML = `
    <label>Username<input id="modalName" name="username" autocomplete="username" autocapitalize="none" spellcheck="false" minlength="3" maxlength="64" required></label>
    <label>Password<input id="modalPassword" name="password" type="password" autocomplete="current-password" minlength="12" maxlength="1024" required></label>
    <button type="submit" class="primary">${mode === 'register' ? 'Create account' : 'Sign in'}</button>
    <p id="modalStatus" role="status"></p>`;
  form.onsubmit = async event => {
    event.preventDefault();
    const password = form.querySelector('#modalPassword');
    const payload = {name: form.querySelector('#modalName').value, password: password.value};
    password.value = '';
    form.querySelector('button').disabled = true;
    try {
      const response = await fetch('/api/auth/' + mode, {
        method: 'POST', credentials: 'same-origin',
        headers: {'Content-Type': 'application/json'}, body: JSON.stringify(payload)
      });
      payload.password = '';
      if (!response.ok) throw new Error();
      dialog.close();
      await refresh();
    } catch {
      payload.password = '';
      form.querySelector('#modalStatus').textContent = 'Sign-in unavailable. Check details and retry.';
      form.querySelector('button').disabled = false;
    }
  };
  body.append(title, form);
  dialog.showModal();
}

function openInstall(update = false) {
  const dialog = ensureDialog();
  const body = $('siteModalBody');
  body.replaceChildren(closeButton(dialog));
  const title = document.createElement('h2');
  title.textContent = update ? 'Update Persimmons' : 'Get Persimmons';
  const text = document.createElement('p');
  text.textContent = update ? 'Install the current build into your unpacked extension folder, then reload it in Chromium.' : 'Download the current build, unzip it, then use Chromium → Extensions → Developer mode → Load unpacked.';
  const link = document.createElement('a');
  link.href = '/assets/extension.zip';
  link.className = 'buttonLink primary';
  link.textContent = update ? 'Download current build' : 'Download extension';
  body.append(title, text, link);
  dialog.showModal();
}

function openAddCredential() {
  const dialog = ensureDialog();
  const body = $('siteModalBody');
  body.replaceChildren(closeButton(dialog));
  const title = document.createElement('h2');
  title.textContent = 'Add a credential';
  const text = document.createElement('p');
  text.textContent = 'Open the HTTPS site where you use the credential, enter it without submitting, then open 🍊 and choose Save for this site.';
  const note = document.createElement('p');
  note.className = 'hint';
  note.textContent = 'The page updates automatically after the extension saves it.';
  body.append(title, text, note);
  dialog.showModal();
}

const failed = () => {
  $('userState').hidden = false;
  $('userState').textContent = 'Service unavailable. Retry shortly.';
  $('extensionState').hidden = false;
  $('extensionState').textContent = 'Connection could not be checked.';
};

$('signOutButton').onclick = async () => {
  try {
    const response = await fetch('/api/logout', {method: 'POST'});
    if (!response.ok) throw new Error();
    await refresh();
  } catch {
    $('userState').hidden = false;
    $('userState').textContent = 'Sign-out unavailable. Retry shortly.';
  }
};
$('signInLink').onclick = event => { event.preventDefault(); openAuth('login'); };
$('createAccount').onclick = () => openAuth('register');
$('getExtension').onclick = () => openInstall(false);
$('updateExtension').onclick = () => openInstall(true);
$('addCredential').onclick = openAddCredential;
$('newVault').onclick = openNewVault;

window.addEventListener('pointerdown', event => {
  if (event.target.closest?.('.connection[draggable="true"]')) dragging = true;
}, true);
window.addEventListener('pointerup', () => { dragging = false; }, true);
window.addEventListener('pageshow', () => refresh().catch(failed));
window.addEventListener('focus', () => refresh().catch(failed));
setInterval(() => { if (!refreshing && !document.hidden && !$('siteModal')?.open) refresh().catch(() => {}); }, 1500);
refresh().catch(failed);