{% extends "base.html" %}
{% block title %}Cassandra · Import Portfolio{% endblock %}

{% block main %}
<section class="panel" style="grid-column: 1 / -1; max-width: 760px; margin: 0 auto;">
  <div class="panel-header">
    <span class="title">Import portfolio (Trading 212 CSV)</span>
    <span class="meta">no broker credentials required</span>
  </div>

  <div class="panel-body" style="padding: 18px clamp(16px, 4vw, 32px) 24px;">
    <p style="color: var(--muted); font-size: 12.5px; margin: 0 0 14px; line-height: 1.6;">
      Export your pie from the T212 web app
      (<span class="neu">Trading 212 → Investing → Your Pie → ⋯ → Export</span>)
      and drop the CSV here. We resolve each Slice to its Yahoo ticker via
      a catalogue we maintain in the background.
    </p>

    <form id="upload-form" autocomplete="off">
      <div id="drop-zone" class="dz">
        <input type="file" id="file-input" name="file" accept=".csv,text/csv" hidden>
        <div class="dz__icon">▱</div>
        <div class="dz__label">Drop a T212 pie CSV here</div>
        <div class="dz__hint">or <a href="#" id="browse-link">browse</a> · max 2 MB</div>
        <div class="dz__filename" id="dz-filename"></div>
      </div>

      <div class="form-row" style="margin-top: 14px;">
        <label for="portfolio-name">Portfolio name (optional)</label>
        <input type="text" id="portfolio-name" name="portfolio_name"
               placeholder="auto-derived from CSV's Total row" maxlength="64">
      </div>

      <div class="form-row" style="margin-top: 6px;">
        <label for="currency">Account currency</label>
        <select id="currency" name="currency">
          <option value="GBP">GBP</option>
          <option value="EUR">EUR</option>
          <option value="USD">USD</option>
        </select>
      </div>

      <button id="submit-btn" type="submit" disabled>Import</button>
    </form>

    <div id="result" class="result" hidden></div>
  </div>
</section>

<script>
(function () {
  var dropZone = document.getElementById('drop-zone');
  var fileInput = document.getElementById('file-input');
  var browseLink = document.getElementById('browse-link');
  var filenameEl = document.getElementById('dz-filename');
  var submitBtn = document.getElementById('submit-btn');
  var form = document.getElementById('upload-form');
  var resultEl = document.getElementById('result');

  function setFile(file) {
    if (!file) return;
    var dt = new DataTransfer();
    dt.items.add(file);
    fileInput.files = dt.files;
    filenameEl.textContent = file.name + ' (' + Math.round(file.size / 1024) + ' KB)';
    submitBtn.disabled = false;
  }

  browseLink.addEventListener('click', function (e) { e.preventDefault(); fileInput.click(); });
  fileInput.addEventListener('change', function () {
    if (fileInput.files[0]) setFile(fileInput.files[0]);
  });

  ['dragenter', 'dragover'].forEach(function (ev) {
    dropZone.addEventListener(ev, function (e) {
      e.preventDefault(); e.stopPropagation();
      dropZone.classList.add('dz--over');
    });
  });
  ['dragleave', 'drop'].forEach(function (ev) {
    dropZone.addEventListener(ev, function (e) {
      e.preventDefault(); e.stopPropagation();
      dropZone.classList.remove('dz--over');
    });
  });
  dropZone.addEventListener('drop', function (e) {
    if (e.dataTransfer.files && e.dataTransfer.files[0]) setFile(e.dataTransfer.files[0]);
  });
  dropZone.addEventListener('click', function (e) {
    if (e.target.tagName !== 'A') fileInput.click();
  });

  form.addEventListener('submit', async function (e) {
    e.preventDefault();
    if (!fileInput.files[0]) return;
    submitBtn.disabled = true;
    submitBtn.textContent = 'Importing…';
    resultEl.hidden = true;
    resultEl.className = 'result';

    var fd = new FormData();
    fd.append('file', fileInput.files[0]);
    var name = document.getElementById('portfolio-name').value.trim();
    if (name) fd.append('portfolio_name', name);
    fd.append('currency', document.getElementById('currency').value);

    try {
      var r = await fetch('/api/portfolios/upload', { method: 'POST', body: fd });
      var data = await r.json();
      if (!r.ok) {
        renderError(data.detail || ('HTTP ' + r.status));
        return;
      }
      renderSuccess(data);
    } catch (err) {
      renderError(err.message);
    } finally {
      submitBtn.textContent = 'Import';
      submitBtn.disabled = false;
    }
  });

  function fmt(n) {
    return (n === null || n === undefined) ? '—' : Number(n).toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
  }

  function renderSuccess(d) {
    var unmappedTxt = d.unmapped && d.unmapped.length
      ? '<div class="result__warn"><strong>' + d.unmapped.length + ' unmapped slice(s):</strong> '
        + d.unmapped.map(function(s) { return '<code>' + s + '</code>'; }).join(', ')
        + ' — these won’t get live prices until the catalogue is extended.</div>'
      : '<div class="result__row neu">All slices resolved to Yahoo tickers.</div>';
    resultEl.className = 'result result--ok';
    resultEl.innerHTML =
      '<div class="result__head">▸ Imported <strong>' + d.portfolio_name + '</strong>'
      + (d.is_new_portfolio ? ' <span class="result__tag">new</span>' : ' <span class="result__tag">new snapshot</span>')
      + '</div>'
      + '<div class="result__grid">'
      +   '<div><div class="k">Positions</div><div class="v">' + d.positions + '</div></div>'
      +   '<div><div class="k">Invested</div><div class="v">' + fmt(d.invested) + '</div></div>'
      +   '<div><div class="k">Value</div><div class="v">' + fmt(d.value) + '</div></div>'
      +   '<div><div class="k">Result</div><div class="v ' + (d.result >= 0 ? 'pos' : 'neg') + '">'
      +     (d.result >= 0 ? '+' : '') + fmt(d.result) + '</div></div>'
      + '</div>'
      + unmappedTxt
      + '<div class="result__row"><a href="/">Back to dashboard →</a></div>';
    resultEl.hidden = false;
  }
  function renderError(msg) {
    resultEl.className = 'result result--err';
    resultEl.innerHTML = '<div class="result__head">✕ Import failed</div><div class="result__row">'
      + String(msg).replace(/[<>]/g, '') + '</div>';
    resultEl.hidden = false;
  }
})();
</script>
{% endblock %}