let authToken = sessionStorage.getItem('authToken');
let selectedFilePath = '';
let currentConfig = {};

function apiHeaders() {
  const h = { 'Content-Type': 'application/json' };
  if (authToken) h['Authorization'] = `Basic ${authToken}`;
  return h;
}

async function api(method, url, body) {
  const res = await fetch(url, {
    method,
    headers: apiHeaders(),
    body: body ? JSON.stringify(body) : undefined
  });
  if (res.status === 401) {
    sessionStorage.removeItem('authToken');
    authToken = null;
    showLogin();
    throw new Error('Unauthorized');
  }
  return res;
}

async function apiJson(method, url, body) {
  const res = await api(method, url, body);
  const data = await res.json();
  if (!res.ok) throw new Error(data.error || 'Request failed');
  return data;
}

// Login
function showLogin() {
  document.getElementById('login-screen').classList.remove('hidden');
  document.getElementById('main-screen').classList.add('hidden');
  document.getElementById('login-error').classList.add('hidden');
}

function showMain() {
  document.getElementById('login-screen').classList.add('hidden');
  document.getElementById('main-screen').classList.remove('hidden');
}

document.getElementById('login-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const username = document.getElementById('login-username').value;
  const password = document.getElementById('login-password').value;
  try {
    const res = await fetch('/api/auth/login', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ username, password })
    });
    const data = await res.json();
    if (data.authenticated) {
      authToken = data.token;
      sessionStorage.setItem('authToken', authToken);
      showMain();
      initApp();
    } else {
      document.getElementById('login-error').textContent = data.error;
      document.getElementById('login-error').classList.remove('hidden');
    }
  } catch (err) {
    document.getElementById('login-error').textContent = 'Connection failed';
    document.getElementById('login-error').classList.remove('hidden');
  }
});

document.getElementById('logout-btn').addEventListener('click', () => {
  sessionStorage.removeItem('authToken');
  authToken = null;
  showLogin();
});

// Tab navigation
document.querySelectorAll('button.tab').forEach(btn => {
  btn.addEventListener('click', () => {
    document.querySelectorAll('button.tab').forEach(b => b.classList.remove('active'));
    btn.classList.add('active');
    document.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));
    document.getElementById(btn.dataset.tab).classList.add('active');
    if (btn.dataset.tab === 'dashboard') loadJobs();
    if (btn.dataset.tab === 'files') loadFilesList();
  });
});

// Mini tabs (video source)
document.querySelectorAll('button.tab-mini').forEach(btn => {
  btn.addEventListener('click', () => {
    document.querySelectorAll('button.tab-mini').forEach(b => b.classList.remove('active'));
    btn.classList.add('active');
    document.querySelectorAll('.src-panel').forEach(p => p.classList.remove('active'));
    document.getElementById('src-' + btn.dataset.src).classList.add('active');
  });
});

// File upload
document.getElementById('video-upload').addEventListener('change', () => {
  const file = document.getElementById('video-upload').files[0];
  if (file) selectedFilePath = null;
});

// Refresh browse files
document.getElementById('refresh-files').addEventListener('click', loadBrowseFiles);
async function loadBrowseFiles() {
  try {
    const data = await apiJson('GET', '/api/files');
    const sel = document.getElementById('video-select');
    sel.innerHTML = '<option value="">-- Select file --</option>';
    data.files.forEach(f => {
      sel.innerHTML += `<option value="${f.filePath}">${f.filename} (${formatSize(f.size)})</option>`;
    });
  } catch (err) {
    console.error(err);
  }
}

document.getElementById('video-select').addEventListener('change', (e) => {
  if (e.target.value) selectedFilePath = e.target.value;
});

// YouTube download
document.getElementById('download-url').addEventListener('click', async () => {
  const url = document.getElementById('youtube-url').value;
  if (!url) return;
  const status = document.getElementById('download-status');
  status.textContent = 'Downloading...';
  status.className = 'status';
  try {
    const data = await apiJson('POST', '/api/files/youtube', { url });
    status.textContent = `Downloaded: ${data.filename}`;
    status.className = 'status success';
    selectedFilePath = data.filePath;
    document.getElementById('video-select').innerHTML += `<option value="${data.filePath}" selected>${data.filename}</option>`;
  } catch (err) {
    status.textContent = `Error: ${err.message}`;
    status.className = 'status error';
  }
});

// New job form
document.getElementById('new-job-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  if (!selectedFilePath) {
    const fileEl = document.getElementById('video-upload');
    if (fileEl.files.length > 0) {
      const formData = new FormData();
      formData.append('video', fileEl.files[0]);
      try {
        const res = await fetch('/api/files/upload', { method: 'POST', headers: { Authorization: `Basic ${authToken}` }, body: formData });
        const data = await res.json();
        if (!res.ok) throw new Error(data.error || 'Upload failed');
        selectedFilePath = data.filePath;
      } catch (err) {
        alert('Upload error: ' + err.message);
        return;
      }
    } else {
      alert('Please select a video file or source');
      return;
    }
  }

  const fd = new FormData(e.target);
  const config = {};
  for (const [key, val] of fd.entries()) {
    if (key === '') continue;
    if (val === 'on') config[key] = true;
    else if (val === 'off') config[key] = false;
    else if (!isNaN(val) && val !== '') config[key] = parseFloat(val);
    else config[key] = val;
  }

  const outputOptions = {
    audio: fd.get('output-audio') === 'on',
    subtitles: fd.get('output-subtitles') === 'on',
    muxed: fd.get('output-muxed') === 'on'
  };

  // Build config with vision/tts providers
  if (config.visionProvider) {
    config.visionProviders = {};
    config.visionProviders[config.visionProvider] = {
      model: config.visionModel || 'gpt-4o',
      maxTokens: config.visionMaxTokens ? parseInt(config.visionMaxTokens) : 300
    };
  }
  if (config.ttsProvider) {
    config.ttsProviders = {};
    config.ttsProviders[config.ttsProvider] = {
      model: config.ttsModel || 'tts-1',
      voice: config.ttsVoice || 'alloy'
    };
  }

  delete config.visionModel;
  delete config.visionMaxTokens;
  delete config.ttsModel;
  delete config['output-audio'];
  delete config['output-subtitles'];
  delete config['output-muxed'];

  try {
    const data = await apiJson('POST', '/api/jobs', { videoPath: selectedFilePath, config, outputOptions });
    await apiJson('POST', `/api/jobs/${data.job.id}/start`);
    selectedFilePath = '';
    document.getElementById('video-upload').value = '';
    document.getElementById('new-job-form').reset();
    document.querySelector('.tab[data-tab="dashboard"]').click();
    loadJobs();
  } catch (err) {
    alert('Error creating job: ' + err.message);
  }
});

// Load jobs
async function loadJobs() {
  try {
    const data = await apiJson('GET', '/api/jobs');
    renderJobs(data.jobs);
  } catch (err) {
    console.error(err);
  }
}

function renderJobs(jobs) {
  const container = document.getElementById('jobs-list');
  if (!jobs.length) {
    container.innerHTML = '<p class="empty">No jobs yet. Create one from the "New Job" tab.</p>';
    return;
  }

  container.innerHTML = jobs.map(j => {
    const segs = JSON.parse(j.segments || '[]');
    const progressClass = j.status === 'completed' ? 'completed' : j.status === 'failed' ? 'failed' : '';
    const downloads = [];
    if (j.status === 'completed') {
      if (j.output_audio) downloads.push(`<a href="/api/jobs/${j.id}/download/audio" download>Audio</a>`);
      if (j.output_subtitles_srt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=srt" download>SRT</a>`);
      if (j.output_subtitles_vtt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=vtt" download>VTT</a>`);
      if (j.output_muxed) downloads.push(`<a href="/api/jobs/${j.id}/download/muxed" download>Muxed</a>`);
    }

    let actions = '';
    if (j.status === 'pending' || j.status === 'queued') {
      actions += `<button class="start-job" data-id="${j.id}">Start</button>`;
    }
    if (j.status === 'processing') {
      actions += `<button class="pause-job" data-id="${j.id}">Pause</button>`;
    }
    if (j.status === 'failed' || j.status === 'paused' || j.status === 'cancelled') {
      actions += `<button class="restart-job" data-id="${j.id}">Restart</button>`;
    }
    if (j.status !== 'processing') {
      actions += `<button class="delete-job danger" data-id="${j.id}">Delete</button>`;
    }

    return `
      <div class="job-card" data-id="${j.id}">
        <div class="job-card-header">
          <h3>${escapeHtml(j.video_filename)}</h3>
          <div class="job-actions">${actions}</div>
        </div>
        <span class="status-badge status-${j.status}">${j.status}</span>
        <div class="progress-bar"><div class="progress-fill ${progressClass}" style="width:${j.progress}%"></div></div>
        <div class="job-meta">
          <span>${Math.round(j.progress)}%</span>
          <span>Index: ${j.current_index}/${j.total_units}</span>
          <span>${new Date(j.created_at).toLocaleString()}</span>
        </div>
        ${j.error ? `<div class="error-msg">${escapeHtml(j.error)}</div>` : ''}
        ${downloads.length ? `<div class="download-links">${downloads.join('')}</div>` : ''}
        <div class="job-detail" data-id="${j.id}">
          <div class="segment-log">${segs.map((s, i) => `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`).join('')}</div>
        </div>
        <button class="toggle-detail" data-id="${j.id}">${segs.length} segments</button>
      </div>`;
  }).join('');

  // Wire up buttons
  container.querySelectorAll('.start-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'start')));
  container.querySelectorAll('.pause-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'pause')));
  container.querySelectorAll('.restart-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'restart')));
  container.querySelectorAll('.delete-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'delete')));
  container.querySelectorAll('.toggle-detail').forEach(b => b.addEventListener('click', () => {
    const detail = container.querySelector(`.job-detail[data-id="${b.dataset.id}"]`);
    detail.classList.toggle('open');
    b.textContent = detail.classList.contains('open') ? 'Hide segments' : `${JSON.parse((jobs.find(j => j.id === b.dataset.id) || {}).segments || '[]').length} segments`;
  }));
}

async function handleJobAction(id, action) {
  const method = action === 'delete' ? 'DELETE' : 'POST';
  const url = `/api/jobs/${id}${action === 'delete' ? '' : '/' + action}`;
  try {
    await api(method, url);
    loadJobs();
  } catch (err) {
    alert(`Error: ${err.message}`);
  }
}

// Jobs refresh
document.getElementById('refresh-jobs').addEventListener('click', loadJobs);

// Auto-refresh jobs
let jobsInterval;
function startJobsPolling() {
  jobsInterval = setInterval(loadJobs, 5000);
}
function stopJobsPolling() {
  clearInterval(jobsInterval);
}

// Settings
async function loadSettings() {
  try {
    const data = await apiJson('GET', '/api/config');
    const container = document.getElementById('settings-fields');
    const config = data.config || {};
    currentConfig = config;
    let html = '';
    for (const [key, value] of Object.entries(config)) {
      html += `<label>${key} <input type="text" name="${key}" value="${escapeHtml(String(value))}"></label>`;
    }
    if (!Object.keys(config).length) {
      html = '<p class="empty">No custom settings yet. Settings from .env are used as defaults.</p>';
    }
    container.innerHTML = html;
  } catch (err) {
    console.error(err);
  }
}

document.getElementById('settings-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const fd = new FormData(e.target);
  const config = {};
  for (const [key, val] of fd.entries()) {
    config[key] = val;
  }
  try {
    await apiJson('PUT', '/api/config', config);
    alert('Settings saved');
  } catch (err) {
    alert('Error: ' + err.message);
  }
});

// Files list
let selectedFiles = new Set();
async function loadFilesList() {
  try {
    const data = await apiJson('GET', '/api/files');
    const tbody = document.querySelector('#files-table tbody');
    tbody.innerHTML = data.files.map(f => `
      <tr>
        <td><input type="checkbox" class="file-checkbox" data-path="${escapeHtml(f.filePath)}"></td>
        <td>${escapeHtml(f.filename)}</td>
        <td>${formatSize(f.size)}</td>
      </tr>
    `).join('');

    document.querySelectorAll('.file-checkbox').forEach(cb => {
      cb.addEventListener('change', () => updateFileSelection());
    });
  } catch (err) {
    console.error(err);
  }
}

function updateFileSelection() {
  selectedFiles.clear();
  document.querySelectorAll('.file-checkbox:checked').forEach(cb => {
    selectedFiles.add(cb.dataset.path);
  });
  document.getElementById('delete-selected-files').disabled = selectedFiles.size === 0;
}

document.getElementById('select-all-files').addEventListener('change', (e) => {
  document.querySelectorAll('.file-checkbox').forEach(cb => { cb.checked = e.target.checked; });
  updateFileSelection();
});

document.getElementById('delete-selected-files').addEventListener('click', async () => {
  if (!confirm(`Delete ${selectedFiles.size} file(s)?`)) return;
  for (const path of selectedFiles) {
    // Files are served from uploads dir, delete via fs on server... 
    // Not implementing server-side file deletion for now
  }
  alert('File deletion not yet implemented');
});

document.getElementById('refresh-files-list').addEventListener('click', loadFilesList);

// Pre-fill new job form with config defaults
async function loadConfigDefaults() {
  try {
    const data = await apiJson('GET', '/api/config');
    const config = data.config || {};

    if (config.visionProvider) {
      const sel = document.querySelector('[name="visionProvider"]');
      sel.innerHTML = '<option value="openai">OpenAI</option><option value="gemini">Gemini</option><option value="ollama">Ollama</option><option value="openrouter">OpenRouter</option>';
      sel.value = config.visionProvider;
    }
    if (config.visionModel) document.querySelector('[name="visionModel"]').value = config.visionModel;
    if (config.ttsProvider) {
      const sel = document.querySelector('[name="ttsProvider"]');
      sel.innerHTML = '<option value="openai">OpenAI</option><option value="elevenlabs">ElevenLabs</option><option value="google">Google Cloud</option>';
      sel.value = config.ttsProvider;
    }
    if (config.ttsModel) document.querySelector('[name="ttsModel"]').value = config.ttsModel;
    if (config.ttsVoice) document.querySelector('[name="ttsVoice"]').value = config.ttsVoice;
    if (config.ttsSpeedFactor) document.querySelector('[name="ttsSpeedFactor"]').value = config.ttsSpeedFactor;
    if (config.ttsInstructions) document.querySelector('[name="ttsInstructions"]').value = config.ttsInstructions;
    if (config.batchWindowDuration) document.querySelector('[name="batchWindowDuration"]').value = config.batchWindowDuration;
    if (config.framesInBatch) document.querySelector('[name="framesInBatch"]').value = config.framesInBatch;
    if (config.captureIntervalSeconds) document.querySelector('[name="captureIntervalSeconds"]').value = config.captureIntervalSeconds;
    if (config.contextWindowSize) document.querySelector('[name="contextWindowSize"]').value = config.contextWindowSize;
    if (config.defaultPrompt) document.querySelector('[name="defaultPrompt"]').value = config.defaultPrompt;
    if (config.changePrompt) document.querySelector('[name="changePrompt"]').value = config.changePrompt;
    if (config.batchPrompt) document.querySelector('[name="batchPrompt"]').value = config.batchPrompt;
  } catch (err) {
    console.error(err);
  }
}

// Setup SSE for live progress
const sseConnections = {};
function connectSSE(jobId) {
  if (sseConnections[jobId]) return;
  const source = new EventSource(`/api/jobs/${jobId}/progress`);
  source.onmessage = (event) => {
    const data = JSON.parse(event.data);
    updateJobCard(jobId, data);
    if (data.status === 'completed' || data.status === 'failed' || data.status === 'cancelled') {
      source.close();
      delete sseConnections[jobId];
    }
  };
  source.onerror = () => {
    source.close();
    delete sseConnections[jobId];
  };
  sseConnections[jobId] = source;
}

function updateJobCard(jobId, data) {
  const card = document.querySelector(`.job-card[data-id="${jobId}"]`);
  if (!card) return;

  const badge = card.querySelector('.status-badge');
  badge.className = `status-badge status-${data.status}`;
  badge.textContent = data.status;

  const fill = card.querySelector('.progress-fill');
  fill.style.width = data.progress + '%';
  fill.className = 'progress-fill';
  if (data.status === 'completed') fill.classList.add('completed');
  if (data.status === 'failed') fill.classList.add('failed');

  const metaSpans = card.querySelectorAll('.job-meta span');
  if (metaSpans[0]) metaSpans[0].textContent = Math.round(data.progress) + '%';
  if (metaSpans[1]) metaSpans[1].textContent = `Index: ${data.currentIndex}/${data.totalUnits}`;

  // Update segments
  const log = card.querySelector('.segment-log');
  if (data.segments && log) {
    log.innerHTML = data.segments.map((s, i) => `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`).join('');
  }

  // Update segment count button
  const toggleBtn = card.querySelector('.toggle-detail');
  if (toggleBtn && data.segments) {
    toggleBtn.textContent = `${data.segments.length} segments`;
  }
}

// Initialize
function initApp() {
  loadJobs();
  loadBrowseFiles();
  loadConfigDefaults();
  startJobsPolling();
}

// Escape HTML for safe rendering
function escapeHtml(str) {
  if (!str) return '';
  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}

function formatSize(bytes) {
  if (!bytes) return '0 B';
  const units = ['B', 'KB', 'MB', 'GB'];
  let i = 0;
  let size = bytes;
  while (size >= 1024 && i < units.length - 1) { size /= 1024; i++; }
  return `${size.toFixed(1)} ${units[i]}`;
}

// Check if already authenticated
(async () => {
  if (authToken) {
    try {
      const res = await fetch('/api/auth/check', { headers: { Authorization: `Basic ${authToken}` } });
      const data = await res.json();
      if (data.authenticated) {
        showMain();
        initApp();
        return;
      }
    } catch (e) {}
  }
  showLogin();
})();