{% extends "base.html" %}
{% block content %}

<div class="pve-panel" id="step1">
  <div class="pve-panel-header">
    <span class="pve-panel-title">New Conversion Session</span>
  </div>
  <div class="pve-panel-body">

  <form id="session-form" onsubmit="startSession(event)">
    <div class="pve-form-group">
      <label for="vm-name">VM Name *</label>
      <input type="text" id="vm-name" name="vm_name" required class="pve-input"
             placeholder="e.g. debian-test" value="{{ prefill_vmname or '' }}">
      <span class="pve-hint">Display name for the VM on the Proxmox host.</span>
    </div>

    <div class="pve-form-group">
      <label for="vmid">VM ID *</label>
      <input type="number" id="vmid" name="vmid" required class="pve-input"
             placeholder="e.g. 21050" min="21000" max="21100">
      <span class="pve-hint">Range 21000–21100. Must be unique on the Proxmox host.</span>
    </div>

    <div class="pve-form-group">
      <label for="source-url">Download URL *</label>
      <input type="url" id="source-url" name="source_url" required class="pve-input"
             placeholder="https://example.com/image.7z">
      <span class="pve-hint">Direct URL to a disk image or archive (.vmdk, .7z, .zip, etc.)</span>
    </div>

    <button type="submit" id="start-btn" class="pve-btn pve-btn-primary">Download &amp; Analyse</button>
  </form>

  <hr class="pve-divider">
  <p class="pve-dim" style="font-size:0.78rem; margin-bottom:0.5rem;">
    Files on a remote server? Pull directly via SCP:
  </p>
  <a href="/scp" class="pve-btn">SCP Pull</a>

  <!-- Progress area -->
  <div id="session-status" class="pve-hidden" style="margin-top:1rem;">
    <div id="phase-label" style="margin-bottom:0.5rem;"></div>
    <div class="pve-progress">
      <div class="pve-progress-bar" id="pve-progress-bar" style="width:0%">0%</div>
    </div>
    <div id="session-error"></div>
  </div>
  </div>
</div>

<div id="analysis-section"></div>
<div id="polling-section"></div>

<script>
function setPhase(label, pct, isSpinner) {
  const el = document.getElementById('phase-label');
  const fill = document.getElementById('pve-progress-bar');
  if (el) el.innerHTML = (isSpinner ? '<span class="pve-spinner"></span> ' : '') + label;
  if (fill) { fill.style.width = pct + '%'; fill.textContent = pct > 0 ? pct + '%' : ''; }
}

function showError(msg) {
  const el = document.getElementById('session-error');
  if (el) el.innerHTML += '<div class="pve-alert pve-alert-error" style="margin-top:0.5rem;">' + msg + '</div>';
}

function sleep(ms) { return new Promise(resolve => setTimeout(resolve, ms)); }

async function startSession(e) {
  e.preventDefault();
  const btn = document.getElementById('start-btn');
  const status = document.getElementById('session-status');
  const analysis = document.getElementById('analysis-section');
  const polling = document.getElementById('polling-section');
  btn.disabled = true;
  analysis.innerHTML = '';
  polling.innerHTML = '';
  document.getElementById('session-error').textContent = '';

  const vmid = document.getElementById('vmid').value;
  const vmName = document.getElementById('vm-name').value.trim();
  const url = document.getElementById('source-url').value.trim();
  if (!url) { showError('Please enter a download URL.'); btn.disabled = false; return; }

  const sessionId = window.VM_BENCH_SID || '';
  const formData = new FormData();
  formData.append('vmid', vmid);
  formData.append('vm_name', vmName);
  formData.append('source_type', 'url');
  formData.append('source_url', url);
  formData.append('session_id', sessionId);

  status.classList.remove('pve-hidden');
  setPhase('Starting download...', 0, true);

  try { await handleDownload(formData); }
  catch (err) { setPhase('Download failed', 0, false); showError(err.message); }
  btn.disabled = false;
}

async function handleDownload(formData) {
  let resp;
  try { resp = await fetch('/session/upload', { method: 'POST', body: formData }); }
  catch (err) { throw new Error('Network error: ' + err.message); }

  const data = await resp.json();
  if (data.phase === 'error') { throw new Error(data.error); }
  if (data.phase !== 'downloading') { throw new Error('Unexpected: ' + data.phase); }

  const filename = data.filename;
  setPhase('Downloading source file...', 0, true);

  for (;;) {
    await sleep(2000);
    try {
      const pr = await fetch('/session/progress/' + encodeURIComponent(filename));
      const pdata = await pr.json();

      if (pdata.phase === 'complete') {
        setPhase('Download complete (' + (pdata.file_size_gb || 0) + ' GiB)', 100, false);
        await sleep(500);
        await runAnalysis(data.vmid, filename, data.vm_name);
        return;
      }
      if (pdata.phase === 'error') { throw new Error(pdata.error); }
      if (pdata.phase === 'too_slow') {
        throw new Error('<strong>Download too slow.</strong><br><br>' + (pdata.message || '') +
          '<br><br>Try downloading to a server and using SCP Pull instead.');
      }
      if (pdata.phase === 'downloading') {
        const gb = (pdata.file_size_gb || 0).toFixed(1);
        let label = 'Downloading source file... ' + gb + ' GiB';
        if (pdata.speed_mbps) label += ' (' + pdata.speed_mbps + ' MB/s)';
        if (pdata.eta) label += ' — ' + pdata.eta;
        const totalGb = pdata.content_length_gb;
        const pct = totalGb ? Math.round((pdata.file_size_gb / totalGb) * 100) : 0;
        setPhase(label, pct, totalGb ? false : true);
      }
    } catch (_) {}
  }
}

async function runAnalysis(vmid, filename, vmName) {
  setPhase('Step 2/2: Analysing source image...', 0, true);
  const fd = new FormData();
  fd.append('vmid', vmid); fd.append('filename', filename); fd.append('vm_name', vmName);
  fd.append('session_id', window.VM_BENCH_SID || '');
  const resp = await fetch('/session/analyze', { method: 'POST', body: fd });
  const data = await resp.json();

  if (data.phase === 'error') {
    setPhase('Analysis failed', 0, false);
    showError(data.error);
    return;
  }

  var analysisId = data.analysis_id;
  if (!analysisId) {
    setPhase('Analysis failed', 0, false);
    showError('Backend returned invalid response — may need restart.');
    return;
  }

  var startTime = Date.now();
  var pollErrors = 0;

  for (;;) {
    await sleep(2000);
    try {
      var pr = await fetch('/session/analyze/status/' + analysisId);
      var sdata = await pr.json();
      var elapsed = Math.round((Date.now() - startTime) / 1000);
      setPhase('Analysing... ' + (sdata.message || '') + ' (' + elapsed + 's)', sdata.status === 'completed' ? 100 : 50, sdata.status !== 'completed');

      if (sdata.status === 'completed') {
        await sleep(500);
        var rr = await fetch('/session/analyze/result/' + analysisId + '?source_filename=' + encodeURIComponent(filename) + '&vm_name=' + encodeURIComponent(vmName) + '&vmid=' + vmid);
        var html = await rr.text();
        document.getElementById('analysis-section').innerHTML = html;
        document.getElementById('session-status').classList.add('pve-hidden');
        initConfirmForm();
        return;
      }
      if (sdata.status === 'failed') {
        setPhase('Analysis failed', 0, false);
        showError(sdata.error_details || 'Analysis failed');
        return;
      }
      if (sdata.error) {
        pollErrors++;
        if (pollErrors > 15) {
          setPhase('Analysis failed', 0, false);
          showError('Backend unavailable — analysis may need restart.');
          return;
        }
      } else {
        pollErrors = 0;
      }
    } catch (_) {}
  }
}

function initConfirmForm() {
  const form = document.getElementById('confirm-form');
  if (!form) return;
  form.addEventListener('submit', submitJob);
  const bootSel = form.querySelector('select[name="auto_detect_boot"]');
  if (bootSel) {
    bootSel.addEventListener('change', function() {
      document.getElementById('boot-type-group').style.display =
        this.value === 'false' ? 'block' : 'none';
    });
  }
}

async function submitJob(e) {
  e.preventDefault();
  const form = e.target;
  const btn = form.querySelector('#submit-btn');
  const status = document.getElementById('submit-status');
  btn.disabled = true;
  status.classList.remove('pve-hidden');
  status.innerHTML = '<div class="pve-spinner"></div> Submitting job...';
  const formData = new FormData(form);
  formData.append('session_id', window.VM_BENCH_SID || '');
  try {
    const resp = await fetch('/session/confirm', { method: 'POST', body: formData });
    const html = await resp.text();
    document.getElementById('step1').style.display = 'none';
    document.getElementById('analysis-section').innerHTML = '';
    document.getElementById('polling-section').innerHTML = html;
    initPolling();
  } catch (err) {
    status.innerHTML = '<div class="pve-alert pve-alert-error">Failed: ' + err.message + '</div>';
    btn.disabled = false;
  }
}

let _pollTimer = null;
function initPolling() {
  const container = document.getElementById('polling-container');
  if (!container) return;
  const jobId = container.dataset.jobId;
  const vmid = container.dataset.vmid;
  const sourceFilename = container.dataset.sourceFilename;
  const startTime = Date.now();
  let completed = false;

  document.getElementById('btn-clone').onclick = () => cloneVM(jobId, vmid);
  document.getElementById('btn-copy').onclick = () => {
    document.getElementById('copy-options').classList.remove('pve-hidden');
  };
  document.getElementById('btn-cleanup').onclick = () => reuseImage(jobId, vmid, sourceFilename, false);
  document.getElementById('btn-copy-start').onclick = () => copyVM(jobId, vmid, sourceFilename);
  const prevVmid = parseInt(vmid) || 21000;
  document.getElementById('reuse-vmid').value = prevVmid + 1;
  document.getElementById('reuse-vmname').value = (sourceFilename.split('.')[0] || 'vm') + '-2';

  async function poll() {
    try {
      const resp = await fetch('/session/status/' + jobId);
      const data = await resp.json();
      const pct = data.progress_percentage || 0;
      const fill = document.getElementById('pve-progress-bar');
      if (fill) { fill.style.width = pct + '%'; fill.textContent = pct + '%'; }
      const elMsg = document.getElementById('status-message');
      if (elMsg) elMsg.textContent = data.message || '';
      document.getElementById('elapsed').textContent = 'Elapsed: ' + Math.round((Date.now() - startTime) / 1000) + 's';
      const badge = document.getElementById('status-badge');
      const map = { 'queued': ['pve-badge pve-badge-queued', 'Queued'], 'processing_conversion': ['pve-badge pve-badge-running', 'Converting...'], 'importing_storage': ['pve-badge pve-badge-running', 'Importing...'], 'completed': ['pve-badge pve-badge-completed', 'Completed'], 'failed': ['pve-badge pve-badge-failed', 'Failed'] };
      const [cls, text] = map[data.status] || ['pve-badge pve-badge-queued', data.status];
      if (badge) { badge.className = 'badge ' + cls; badge.innerHTML = (data.status === 'processing_conversion' || data.status === 'importing_storage') ? '<span class="pve-spinner"></span> ' + text : text; }
      if (data.error_details) { const eb = document.getElementById('error-block'); if (eb) { eb.classList.remove('pve-hidden'); eb.textContent = data.error_details; } }
      if (data.status === 'completed' || data.status === 'failed') { completed = true; if (data.status === 'completed') { const rs = document.getElementById('reuse-section'); if (rs) { rs.classList.remove('pve-hidden'); rs.scrollIntoView({ behavior: 'smooth' }); } } return; }
      if (!completed) _pollTimer = setTimeout(poll, 2000);
    } catch (err) { const eb = document.getElementById('error-block'); if (eb) { eb.classList.remove('pve-hidden'); eb.textContent = 'Polling error: ' + err.message; } if (!completed) _pollTimer = setTimeout(poll, 5000); }
  }
  _pollTimer = setTimeout(poll, 3000);
}

async function reuseImage(jobId, vmid, sourceFilename, keep) {
  await fetch('/session/cleanup/' + jobId, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ delete_staging_files: true, session_id: window.VM_BENCH_SID || '' }) });
  window.location.href = '/';
}

async function cloneVM(jobId, sourceVmid) {
  const newVmid = parseInt(document.getElementById('reuse-vmid').value) || 0;
  const newName = document.getElementById('reuse-vmname').value.trim();
  if (!newVmid || !newName) { alert('Please fill VM Name and ID.'); return; }
  const status = document.getElementById('reuse-submit-status');
  status.classList.remove('pve-hidden');
  status.innerHTML = '<div class="pve-spinner"></div> Cloning VM...';
  try {
    const resp = await fetch('/session/clone', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ source_vmid: sourceVmid, target_vmid: newVmid, target_name: newName }) });
    const data = await resp.json();
    status.innerHTML = data.status === 'completed' ? '<div class="pve-alert pve-alert-success">VM ' + newVmid + ' cloned!</div>' : '<div class="pve-alert pve-alert-error">Clone failed: ' + (data.error_details || 'Unknown') + '</div>';
  } catch (err) { status.innerHTML = '<div class="pve-alert pve-alert-error">Clone failed: ' + err.message + '</div>'; }
}

async function copyVM(jobId, vmid, sourceFilename) {
  const newVmid = parseInt(document.getElementById('reuse-vmid').value) || 0;
  const newName = document.getElementById('reuse-vmname').value.trim();
  if (!newVmid || !newName) { alert('Please fill VM Name and ID.'); return; }
  const status = document.getElementById('copy-status');
  status.classList.remove('pve-hidden');
  status.innerHTML = '<div class="pve-spinner"></div> Submitting job...';
  const payload = new FormData();
  payload.append('vmid', newVmid); payload.append('vm_name', newName);
  payload.append('source_filename', sourceFilename);
  payload.append('disk_format', 'vmdk');
  payload.append('cpu_cores', document.getElementById('copy-cores').value || '2');
  payload.append('ram_mb', document.getElementById('copy-ram').value || '4096');
  payload.append('target_storage', document.getElementById('copy-storage').value || 'local-lvm');
  const diskGb = document.getElementById('copy-disk').value;
  if (diskGb) payload.append('target_disk_size_gb', diskGb);
  payload.append('auto_detect_boot', 'true');
  payload.append('boot_type', 'legacy');
  payload.append('session_id', window.VM_BENCH_SID || '');
  try {
    const resp = await fetch('/session/confirm', { method: 'POST', body: payload });
    document.getElementById('polling-section').innerHTML = await resp.text();
    initPolling();
  } catch (err) { status.innerHTML = '<div class="pve-alert pve-alert-error">Failed: ' + err.message + '</div>'; }
}
</script>

{% endblock %}