{% extends "base.html" %}
{% block title %}Distributions — FastAPI Showcase{% endblock %}

{% block content %}
<div class="page-header">
  <h1>Distributions</h1>
  <p class="page-subtitle">Histograms, box plots, and statistical views</p>
</div>

<!-- Tab bar -->
<div class="tab-bar">
  <button class="tab-btn active" data-tab="histogram">Histogram</button>
  <button class="tab-btn" data-tab="boxplot">Box Plot</button>
</div>

<!-- Shared controls -->
<div class="panel-layout">
  <div class="card controls-panel">
    <label class="control-label">Variable</label>
    <select id="dist-var" class="control-select">
      <option value="sales" selected>Sales</option>
      <option value="profit">Profit</option>
      <option value="units">Units</option>
    </select>

    <label class="control-label">Group by</label>
    <select id="dist-group" class="control-select">
      <option value="none" selected>None</option>
      <option value="category">Category</option>
      <option value="region">Region</option>
    </select>

    <div id="bins-control">
      <label class="control-label">Bins</label>
      <input type="range" id="dist-bins" min="5" max="60" value="20" class="control-range">
      <span id="dist-bins-val" class="range-value">20</span>
    </div>

    <button id="dist-update" class="btn-primary">Update</button>
  </div>

  <div class="chart-panel">
    <div id="tab-histogram" class="tab-content active">
      <div class="card">
        <div class="chart-box chart-box-tall"><canvas id="histChart"></canvas></div>
      </div>
    </div>
    <div id="tab-boxplot" class="tab-content">
      <div class="card">
        <div id="box-container" class="box-plot-container"></div>
      </div>
    </div>
  </div>
</div>
{% endblock %}

{% block scripts %}
<script>
(function() {
  const PALETTE = ['#0072B5','#00b894','#6c5ce7','#fdcb6e','#e17055','#00cec9','#d63031','#636e72'];
  let histInstance = null;

  initTabs();

  document.getElementById('dist-bins').addEventListener('input', function() {
    document.getElementById('dist-bins-val').textContent = this.value;
  });

  function loadHistogram() {
    const v = document.getElementById('dist-var').value;
    const g = document.getElementById('dist-group').value;
    const b = document.getElementById('dist-bins').value;
    fetch(`api/distribution?var=${v}&group=${g}&bins=${b}`)
      .then(r => r.json())
      .then(d => {
        if (histInstance) histInstance.destroy();
        const datasets = d.datasets.map((ds, i) => ({
          label: ds.label,
          data: ds.data,
          backgroundColor: PALETTE[i % PALETTE.length] + 'aa',
          borderColor: PALETTE[i % PALETTE.length],
          borderWidth: 1,
          borderRadius: 2
        }));
        histInstance = new Chart(document.getElementById('histChart'), {
          type: 'bar',
          data: {labels: d.labels, datasets},
          options: chartOpts({
            x: {title: {display: true, text: v.charAt(0).toUpperCase() + v.slice(1), font: {family: 'Inter'}}},
            y: {title: {display: true, text: 'Count', font: {family: 'Inter'}}}
          })
        });
      });
  }

  function loadBoxPlot() {
    const v = document.getElementById('dist-var').value;
    const g = document.getElementById('dist-group').value;
    fetch(`api/box?var=${v}&group=${g}`)
      .then(r => r.json())
      .then(d => {
        const container = document.getElementById('box-container');
        let html = '<div class="box-row-header"><span class="box-label-col">Group</span><span class="box-viz-col">Distribution</span><span class="box-stats-col">Min / Q1 / Median / Q3 / Max</span></div>';
        const allMax = Math.max(...d.stats.map(s => s.max));
        const allMin = Math.min(...d.stats.map(s => s.min));
        const range = allMax - allMin || 1;

        d.stats.forEach((s, i) => {
          const pct = v => ((v - allMin) / range * 100).toFixed(1);
          const left = pct(s.q1);
          const right = 100 - parseFloat(pct(s.q3));
          const medPos = pct(s.median);
          const whiskerL = pct(s.min);
          const whiskerR = pct(s.max);
          const color = PALETTE[i % PALETTE.length];

          html += `<div class="box-row">
            <span class="box-label-col">${d.labels[i]}</span>
            <span class="box-viz-col">
              <div class="box-track">
                <div class="box-whisker" style="left:${whiskerL}%;width:${left - whiskerL}%;border-color:${color}"></div>
                <div class="box-iqr" style="left:${left}%;right:${right}%;background:${color}33;border-color:${color}">
                  <div class="box-median" style="left:${((medPos - left) / (100 - right - parseFloat(left)) * 100).toFixed(1)}%;background:${color}"></div>
                </div>
                <div class="box-whisker" style="left:${100 - right}%;width:${parseFloat(whiskerR) - (100 - right)}%;border-color:${color}"></div>
              </div>
            </span>
            <span class="box-stats-col">${s.min} / ${s.q1} / ${s.median} / ${s.q3} / ${s.max}</span>
          </div>`;
        });
        container.innerHTML = html;
      });
  }

  function update() {
    loadHistogram();
    loadBoxPlot();
  }

  document.getElementById('dist-update').addEventListener('click', update);
  update();
})();
</script>
{% endblock %}