/// Entry detail view — shows fields, TOTP countdown, copy/fill shortcuts.

import { getState, setState, sendMessage, navigate, escapeHtml } from '../popup';
import type { ManifestEntry } from '../../shared/types';

let totpInterval: ReturnType<typeof setInterval> | null = null;

function stopTotpTimer(): void {
  if (totpInterval !== null) {
    clearInterval(totpInterval);
    totpInterval = null;
  }
}

async function copyToClipboard(text: string): Promise<void> {
  try {
    await navigator.clipboard.writeText(text);
  } catch {
    // Fallback for older browsers.
    const ta = document.createElement('textarea');
    ta.value = text;
    ta.style.position = 'fixed';
    ta.style.left = '-9999px';
    document.body.appendChild(ta);
    ta.select();
    document.execCommand('copy');
    document.body.removeChild(ta);
  }
}

export function renderEntryDetail(app: HTMLElement): void {
  const state = getState();
  const entry = state.selectedEntry;
  const id = state.selectedId;
  if (!entry || !id) {
    navigate('list');
    return;
  }

  stopTotpTimer();

  let html = `
    <div class="detail-header">
      <span class="detail-title">${escapeHtml(entry.name)}</span>
      <button class="btn" id="back-btn" style="font-size:11px;">esc</button>
    </div>
  `;

  // URL
  if (entry.url) {
    html += `
      <div class="field">
        <div class="label">url</div>
        <div class="field-value">${escapeHtml(entry.url)}</div>
      </div>
    `;
  }

  // Username
  if (entry.username) {
    html += `
      <div class="field">
        <div class="label">username</div>
        <div class="field-value" id="username-val">${escapeHtml(entry.username)}</div>
      </div>
    `;
  }

  // Password (masked by default)
  html += `
    <div class="field">
      <div class="label">password</div>
      <div class="field-value" id="password-val" style="cursor:pointer;">
        <span id="password-display">********</span>
      </div>
    </div>
  `;

  // TOTP
  if (entry.totp_secret) {
    html += `
      <div class="field">
        <div class="label">totp</div>
        <div class="totp-code" id="totp-code">------</div>
        <div class="totp-bar"><div class="totp-bar-fill" id="totp-bar-fill" style="width:100%;"></div></div>
      </div>
    `;
  }

  // Notes
  if (entry.notes) {
    html += `
      <div class="field">
        <div class="label">notes</div>
        <div class="field-value">${escapeHtml(entry.notes)}</div>
      </div>
    `;
  }

  // Group
  if (entry.group) {
    html += `
      <div class="field">
        <div class="label">group</div>
        <div class="field-value">${escapeHtml(entry.group)}</div>
      </div>
    `;
  }

  // Metadata
  html += `
    <div class="field">
      <div class="muted">updated ${escapeHtml(entry.updated_at)}</div>
    </div>
  `;

  // Key hints
  html += `
    <div class="keyhints">
      <span><kbd>c</kbd> copy user</span>
      <span><kbd>p</kbd> copy pass</span>
      ${entry.totp_secret ? '<span><kbd>t</kbd> copy totp</span>' : ''}
      <span><kbd>f</kbd> autofill</span>
      <span><kbd>e</kbd> edit</span>
      <span><kbd>d</kbd> delete</span>
    </div>
  `;

  app.innerHTML = html;

  // --- Password toggle ---
  let passwordVisible = false;
  const passwordDisplay = document.getElementById('password-display')!;
  const passwordVal = document.getElementById('password-val')!;
  passwordVal?.addEventListener('click', () => {
    passwordVisible = !passwordVisible;
    passwordDisplay.textContent = passwordVisible ? entry.password : '********';
  });

  // --- Back button ---
  document.getElementById('back-btn')?.addEventListener('click', goBack);

  // --- TOTP timer ---
  if (entry.totp_secret) {
    refreshTotp(id);
    totpInterval = setInterval(() => refreshTotp(id), 1000);
  }

  // --- Keyboard shortcuts ---
  const handler = async (e: KeyboardEvent) => {
    // Ignore if typing in an input.
    if ((e.target as HTMLElement).tagName === 'INPUT') return;

    switch (e.key) {
      case 'Escape':
        document.removeEventListener('keydown', handler);
        goBack();
        break;

      case 'c':
        if (entry.username) await copyToClipboard(entry.username);
        break;

      case 'p':
        await copyToClipboard(entry.password);
        break;

      case 't':
        if (entry.totp_secret) {
          const codeEl = document.getElementById('totp-code');
          if (codeEl) await copyToClipboard(codeEl.textContent ?? '');
        }
        break;

      case 'f': {
        const resp = await sendMessage({
          type: 'fill_credentials',
          username: entry.username ?? '',
          password: entry.password,
        });
        if (!resp.ok) setState({ error: resp.error });
        break;
      }

      case 'e':
        document.removeEventListener('keydown', handler);
        stopTotpTimer();
        navigate('edit');
        break;

      case 'd':
        e.preventDefault();
        showDeleteConfirm(id, entry.name, handler);
        break;
    }
  };

  document.addEventListener('keydown', handler);
}

async function refreshTotp(id: string): Promise<void> {
  const resp = await sendMessage({ type: 'get_totp', id });
  if (resp.ok) {
    const data = resp.data as { code: string; remaining_seconds: number };
    const codeEl = document.getElementById('totp-code');
    const barEl = document.getElementById('totp-bar-fill');
    if (codeEl) codeEl.textContent = data.code;
    if (barEl) barEl.style.width = `${(data.remaining_seconds / 30) * 100}%`;
  }
}

function goBack(): void {
  stopTotpTimer();
  // Reload the entry list.
  sendMessage({ type: 'list_entries' }).then(resp => {
    if (resp.ok) {
      const data = resp.data as { entries: Array<[string, ManifestEntry]> };
      navigate('list', {
        entries: data.entries,
        selectedId: null,
        selectedEntry: null,
      });
    }
  });
}

function showDeleteConfirm(id: string, name: string, parentHandler: (e: KeyboardEvent) => void): void {
  const overlay = document.createElement('div');
  overlay.className = 'confirm-overlay';
  overlay.innerHTML = `
    <div class="confirm-box">
      <p>Delete <strong>${escapeHtml(name)}</strong>?</p>
      <button class="btn" id="cancel-delete">cancel</button>
      <button class="btn btn-danger" id="confirm-delete">delete</button>
    </div>
  `;
  document.body.appendChild(overlay);

  document.getElementById('cancel-delete')?.addEventListener('click', () => {
    overlay.remove();
  });

  document.getElementById('confirm-delete')?.addEventListener('click', async () => {
    overlay.remove();
    setState({ loading: true });
    const resp = await sendMessage({ type: 'delete_entry', id });
    if (resp.ok) {
      document.removeEventListener('keydown', parentHandler);
      stopTotpTimer();
      goBack();
    } else {
      setState({ loading: false, error: resp.error });
    }
  });
}