/* Charts are reconstructed from current model scores and stored addition dates. */
(() => {
  'use strict';
  const escapeHtml = value => String(value).replace(/[&<>"']/g, char => ({
    '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#039;'
  })[char]);
  const calendarTime = value => Date.parse(`${value}T00:00:00Z`);
  const dayLength = 86400000;
  const formatDate = (value, year = false) => new Intl.DateTimeFormat('en-AU', {
    day: 'numeric', month: 'short', ...(year ? { year: 'numeric' } : {}), timeZone: 'UTC'
  }).format(new Date(calendarTime(value)));
  const lastIncluded = value => new Date(calendarTime(value) - dayLength).toISOString().slice(0, 10);
  const lab = key => ORGS[key] || { name: key, chartBorder: '#c2b6ff', url: null };

  function dateAxis(history, wrapperClass = '') {
    const start = calendarTime(history.start);
    const span = calendarTime(history.endExclusive) - start;
    const ticks = [{ value: history.start, label: formatDate(history.start) }];
    const cursor = new Date(start);
    cursor.setUTCDate(1);
    cursor.setUTCMonth(cursor.getUTCMonth() + 1);
    while (cursor.getTime() < calendarTime(history.asOf)) {
      const fraction = (cursor.getTime() - start) / span;
      if (fraction > .12 && fraction < .88) {
        ticks.push({ value: cursor.toISOString().slice(0, 10), label: new Intl.DateTimeFormat('en-AU', { month: 'short', timeZone: 'UTC' }).format(cursor) });
      }
      cursor.setUTCMonth(cursor.getUTCMonth() + 1);
    }
    ticks.push({ value: history.endExclusive, label: formatDate(history.asOf) });
    return `<div class="history-date-axis ${wrapperClass}" aria-hidden="true">${ticks.map(tick =>
      `<span class="history-tick" style="left:${(calendarTime(tick.value) - start) / span * 100}%">${escapeHtml(tick.label)}</span>`
    ).join('')}</div>`;
  }

  function categoryLegend(classes) {
    return `<div class="legend-bar history-legend" aria-label="Size category colors">${classes.map(category =>
      `<span class="legend-item history-legend-item"><span class="legend-dot history-swatch" style="background:${category.color}"></span>${escapeHtml(category.key)}</span>`
    ).join('')}</div>`;
  }

  function organizationLegend(keys) {
    return `<div class="legend-bar history-legend" aria-label="Organization colors">${[...new Set(keys)].map(key => {
      const organization = lab(key);
      return `<span class="legend-item history-legend-item"><span class="legend-dot history-swatch" style="background:${escapeHtml(organization.chartBorder)}"></span>${escapeHtml(organization.name)}</span>`;
    }).join('')}</div>`;
  }

  function buildHistory() {
    const classes = [
      { key: '<150M', limit: 150000000, color: '#2b65bd' },
      { key: '<100M', limit: 100000000, color: '#f5d657' },
      { key: '<50M', limit: 50000000, color: '#e984bf' },
      { key: '<10M', limit: 10000000, color: '#4bc4ba' },
      { key: '<3M', limit: 3000000, color: '#70d18b' }
    ];
    const excluded = new Set(['facebook', 'huggingface', 'openai', 'google', 'microsoft']);
    const parts = new Intl.DateTimeFormat('en-AU', {
      timeZone: 'Australia/Sydney', year: 'numeric', month: '2-digit', day: '2-digit'
    }).formatToParts(new Date());
    const today = Object.fromEntries(parts.map(part => [part.type, part.value]));
    const asOf = `${today.year}-${today.month}-${today.day}`;
    const endExclusive = new Date(calendarTime(asOf) + dayLength).toISOString().slice(0, 10);
    const entries = getModelEntries().map(model => ({ ...model, score: getIntelligenceIndex(model) }))
      .filter(model => !excluded.has(model.org) && Number.isFinite(model.score) && model.params > 0 && model.params < 150000000
        && /^\d{4}-\d{2}-\d{2}$/.test(model.addedDate || '') && Number.isFinite(calendarTime(model.addedDate)) && model.addedDate <= asOf);
    const additionDates = [...new Set(entries.map(model => model.addedDate))].sort();
    const reigns = [];
    const finish = (active, end) => {
      if (!active) return;
      active.endExclusive = end;
      active.days = Math.round((calendarTime(end) - calendarTime(active.start)) / dayLength);
      if (active.days > 0) reigns.push(active);
    };
    classes.forEach(category => {
      let active = null;
      additionDates.forEach(day => {
        let winner = null, best = -Infinity;
        for (const model of entries) {
          if (model.params < category.limit && model.addedDate <= day && model.score > best) {
            winner = model;
            best = model.score;
          }
        }
        if (!winner) return;
        const identity = winner.links.card;
        if (active?.modelId === identity) return;
        finish(active, day);
        active = { modelId: identity, model: winner.name, org: winner.org, card: winner.links.card,
          params: winner.params, category: category.key, start: day };
      });
      finish(active, endExclusive);
    });
    const totals = new Map();
    reigns.forEach(reign => {
      if (!totals.has(reign.org)) totals.set(reign.org, { org: reign.org, categories: {}, days: 0 });
      const row = totals.get(reign.org);
      row.categories[reign.category] = (row.categories[reign.category] || 0) + reign.days;
      row.days += reign.days;
    });
    return { start: additionDates[0] || asOf, asOf, endExclusive, classes, reigns,
      labs: [...totals.values()].sort((a, b) => b.days - a.days || a.org.localeCompare(b.org)) };
  }

  function currentModel(model) {
    const entries = getModelEntries();
    const exact = entries.find(entry => entry.links?.card === model.card || (entry.org === model.org && entry.name === model.model));
    if (exact) return exact;
    const sameName = entries.filter(entry => entry.name === model.model);
    return sameName.length === 1 ? sameName[0] : null;
  }

  function modelTotals(history) {
    const groups = new Map();
    history.reigns.forEach(reign => {
      const identity = reign.modelId || reign.card;
      if (!groups.has(identity)) groups.set(identity, { model: reign.model, card: reign.card, org: reign.org, params: reign.params, categories: {}, reigns: [], days: 0 });
      const group = groups.get(identity);
      group.categories[reign.category] = (group.categories[reign.category] || 0) + reign.days;
      group.days += reign.days;
      group.reigns.push(reign);
    });
    for (const group of groups.values()) {
      group.longest = 0;
      history.classes.forEach(category => {
        const reigns = group.reigns.filter(reign => reign.category === category.key).sort((a, b) => a.start.localeCompare(b.start));
        let streak = 0, end = null;
        reigns.forEach(reign => {
          streak = end === reign.start ? streak + reign.days : reign.days;
          end = reign.endExclusive;
          group.longest = Math.max(group.longest, streak);
        });
      });
    }
    return [...groups.values()].sort((a, b) => b.days - a.days || a.model.localeCompare(b.model));
  }

  function renderFrontier(history) {
    const container = document.getElementById('history-frontier');
    if (!container) return;
    if (typeof Chart === 'undefined') {
      container.innerHTML = '<p class="history-empty">The chart library could not load. Reload the page to view the frontier.</p>';
      return;
    }
    const start = calendarTime(history.start);
    const offset = value => (calendarTime(value) - start) / dayLength;
    const end = offset(history.endExclusive);
    const datasets = history.classes.map((category, index) => {
      const reigns = history.reigns.filter(reign => reign.category === category.key)
        .sort((a, b) => a.start.localeCompare(b.start));
      const data = [];
      reigns.forEach(reign => {
        const entry = currentModel(reign);
        const score = entry ? getIntelligenceIndex(entry) : null;
        if (!Number.isFinite(score)) return;
        const x = offset(reign.start);
        // Repeat the arrival's x coordinate to draw a vertical jump on that date.
        if (data.length) data.push({ ...data[data.length - 1], x, record: false });
        data.push({ x, y: score, record: true, reign });
      });
      if (data.length) data.push({ ...data[data.length - 1], x: end, record: false });
      return {
        label: category.key, data, borderColor: category.color, backgroundColor: category.color,
        borderWidth: 4, order: history.classes.length - index,
        borderJoinStyle: 'round', fill: false, tension: 0,
        segment: {
          borderColor: context => {
            const left = data[context.p0DataIndex];
            const right = data[context.p1DataIndex];
            // Plateaus belong to the preceding model; jumps to the new record.
            const owner = left.x === right.x ? right : left;
            return lab(owner.reign.org).chartBorder;
          }
        },
        pointBackgroundColor: context => context.raw?.reign ? lab(context.raw.reign.org).chartBorder : category.color,
        pointRadius: context => context.raw?.record ? 6 : 0,
        pointHoverRadius: context => context.raw?.record ? 9 : 0,
        pointHitRadius: 10, pointBorderWidth: 1.5,
        pointBorderColor: getComputedStyle(container).getPropertyValue('--surface').trim() || '#141416'
      };
    });
    const summaries = datasets.filter(dataset => dataset.data.length).map(dataset =>
      `${dataset.label}: ${dataset.data[dataset.data.length - 1].y.toFixed(2)} II`
    ).join('; ');
    container.innerHTML = `<div class="filter-group"><span class="filter-label">Size category</span><div class="filter-bar" aria-label="Show or hide frontier categories">${history.classes.map((category, index) =>
      `<button type="button" class="filter-btn active history-frontier-toggle" data-frontier-category="${index}" aria-pressed="true" aria-label="${escapeHtml(category.key)} frontier">${escapeHtml(category.key)}</button>`
    ).join('')}</div></div>${organizationLegend(history.reigns.map(reign => reign.org))}
      <div class="history-frontier-plot"><canvas aria-label="Intelligence Index frontier by category, ${escapeHtml(formatDate(history.start, true))} to ${escapeHtml(formatDate(history.asOf, true))}. ${escapeHtml(summaries)}" role="img" aria-describedby="history-frontier-note">${escapeHtml(summaries)}</canvas></div>`;
    const styles = getComputedStyle(container);
    const muted = styles.getPropertyValue('--text-muted').trim();
    const chart = new Chart(container.querySelector('canvas'), {
      type: 'line', data: { datasets },
      options: {
        responsive: true, maintainAspectRatio: false, animation: false,
        interaction: { mode: 'nearest', intersect: true },
        layout: { padding: { top: 12, right: 12 } },
        plugins: {
          legend: { display: false },
          tooltip: {
            ...getChartTooltipOptions(),
            filter: item => item.raw.record,
            callbacks: {
              title: items => items[0]?.raw.reign?.model || '',
              label: item => {
                const reign = item.raw.reign;
                return [
                  `${lab(reign.org).name} · ${reign.category}`,
                  `Intelligence Index: ${item.raw.y.toFixed(2)}`,
                  `Lead began: ${formatDate(reign.start, true)}`,
                  `Time at #1: ${reign.days} ${reign.days === 1 ? 'day' : 'days'}`,
                  `Parameters: ${new Intl.NumberFormat('en-AU', { maximumFractionDigits: 2 }).format(reign.params / 1e6)}M`
                ];
              }
            }
          }
        },
        scales: {
          x: {
            type: 'linear', min: 0, max: end,
            afterBuildTicks: scale => {
              const ticks = [{ value: 0 }];
              const cursor = new Date(start);
              cursor.setUTCDate(1);
              cursor.setUTCMonth(cursor.getUTCMonth() + 1);
              while (cursor.getTime() < calendarTime(history.asOf)) {
                const value = (cursor.getTime() - start) / dayLength;
                if (value > end * .12 && value < end * .88) ticks.push({ value });
                cursor.setUTCMonth(cursor.getUTCMonth() + 1);
              }
              ticks.push({ value: end });
              scale.ticks = ticks;
            },
            ticks: {
              color: muted, maxRotation: 0, autoSkip: true, maxTicksLimit: 7,
              font: { family: "'Space Mono', monospace", size: 10 },
              callback: value => {
                if (value === 0) return formatDate(history.start);
                if (value === end) return formatDate(history.asOf);
                return new Intl.DateTimeFormat('en-AU', { month: 'short', timeZone: 'UTC' }).format(new Date(start + value * dayLength));
              }
            },
            grid: { display: false }, border: { display: false }
          },
          y: {
            grace: '8%',
            title: { display: true, text: 'Intelligence Index', color: muted, font: { family: "'Space Mono', monospace", size: 10 } },
            ticks: { color: muted, maxTicksLimit: 6, font: { family: "'Space Mono', monospace", size: 10 } },
            grid: { color: 'rgba(255,255,255,0.03)' }, border: { display: false }
          }
        }
      }
    });
    container.addEventListener('click', event => {
      const button = event.target.closest('[data-frontier-category]');
      if (!button) return;
      const visible = button.getAttribute('aria-pressed') !== 'true';
      chart.data.datasets[Number(button.dataset.frontierCategory)].hidden = !visible;
      button.setAttribute('aria-pressed', String(visible));
      button.classList.toggle('active', visible);
      chart.update();
    });
  }

  function installHistoryTooltip(section, history, models) {
    const tooltip = document.createElement('div');
    tooltip.id = 'history-tooltip';
    tooltip.className = 'history-tooltip';
    tooltip.setAttribute('role', 'tooltip');
    tooltip.hidden = true;
    document.body.append(tooltip);
    let active = null;
    const selector = '[data-history-reign], [data-history-model], [data-history-lab]';
    const targetFor = element => element?.closest?.(selector);
    const number = value => new Intl.NumberFormat('en-AU', { maximumFractionDigits: 2 }).format(value);
    const parameters = value => value >= 1e6 ? `${number(value / 1e6)}M` : value >= 1e3 ? `${number(value / 1e3)}K` : number(value);
    const detailRows = rows => `<dl>${rows.filter(([, value]) => value !== null && value !== undefined).map(([name, value]) => `<dt>${escapeHtml(name)}</dt><dd>${escapeHtml(value)}</dd>`).join('')}</dl>`;
    const currentII = model => {
      const entry = currentModel(model);
      const score = entry ? getIntelligenceIndex(entry) : null;
      return Number.isFinite(score) ? score.toFixed(2) : null;
    };

    function content(target) {
      if (target.dataset.historyReign !== undefined) {
        const reign = history.reigns[Number(target.dataset.historyReign)];
        if (!reign) return '';
        return `<strong class="history-tooltip-name">${escapeHtml(reign.model)}</strong><span class="history-tooltip-sub">${escapeHtml(lab(reign.org).name)} · ${escapeHtml(reign.category)}</span>${detailRows([
          ['Time at #1', `${reign.days} ${reign.days === 1 ? 'day' : 'days'}`],
          ['Reign', `${formatDate(reign.start)} – ${formatDate(lastIncluded(reign.endExclusive), true)}`],
          ['Parameters', Number.isFinite(reign.params) ? parameters(reign.params) : null],
          ['Current II', currentII(reign)]
        ])}`;
      }
      if (target.dataset.historyModel !== undefined) {
        const model = models[Number(target.dataset.historyModel)];
        if (!model) return '';
        const category = target.dataset.historyCategory;
        const organizationNames = [...new Set(model.reigns.map(reign => lab(reign.org).name))].join(' / ');
        const entry = currentModel(model);
        const params = entry?.params ?? model.params;
        return `<strong class="history-tooltip-name">${escapeHtml(model.model)}</strong><span class="history-tooltip-sub">${escapeHtml(organizationNames)}</span>${detailRows([
          ['Total #1 time', `${model.days} class-days`],
          ['Longest streak', `${model.longest} days`],
          ...(category ? [[category, `${model.categories[category]} days`]] : history.classes.filter(item => model.categories[item.key]).map(item => [item.key, `${model.categories[item.key]} days`])),
          ['Parameters', Number.isFinite(params) ? parameters(params) : null],
          ['Current II', currentII(model)]
        ])}`;
      }
      const organization = target.dataset.historyLab;
      const row = history.labs.find(item => item.org === organization);
      if (!row) return '';
      const category = target.dataset.historyCategory;
      return `<strong class="history-tooltip-name">${escapeHtml(lab(organization).name)}</strong><span class="history-tooltip-sub">Time at #1 across size categories</span>${detailRows([
        ['Total #1 time', `${row.days} class-days`],
        ...(category ? [[category, `${row.categories[category]} days`]] : history.classes.filter(item => row.categories[item.key]).map(item => [item.key, `${row.categories[item.key]} days`]))
      ])}`;
    }

    function position(target, event) {
      const bounds = target.getBoundingClientRect();
      const pointer = event && Number.isFinite(event.clientX);
      const x = pointer ? event.clientX : bounds.left + Math.min(bounds.width / 2, 100);
      const y = pointer ? event.clientY : bounds.bottom;
      const width = tooltip.offsetWidth, height = tooltip.offsetHeight;
      const left = Math.max(12, Math.min(x + 16, window.innerWidth - width - 12));
      let top = y + 16;
      if (top + height > window.innerHeight - 12) top = y - height - 16;
      tooltip.style.left = `${left}px`;
      tooltip.style.top = `${Math.max(12, top)}px`;
    }

    function hide() {
      active?.removeAttribute('aria-describedby');
      active = null;
      tooltip.hidden = true;
    }

    function show(target, event) {
      if (active !== target) {
        const markup = content(target);
        if (!markup) return;
        active?.removeAttribute('aria-describedby');
        active = target;
        tooltip.innerHTML = markup;
        target.setAttribute('aria-describedby', tooltip.id);
        tooltip.hidden = false;
      }
      position(target, event);
    }

    section.addEventListener('pointerover', event => {
      const target = targetFor(event.target);
      if (target) show(target, event);
    });
    section.addEventListener('pointermove', event => {
      if (active && active.contains(event.target)) position(active, event);
    });
    section.addEventListener('pointerout', event => {
      const target = targetFor(event.target);
      if (target && target === active && !target.contains(event.relatedTarget) && !target.contains(document.activeElement)) hide();
    });
    section.addEventListener('focusin', event => {
      const target = targetFor(event.target);
      if (target) show(target);
    });
    section.addEventListener('focusout', event => {
      if (active && !active.contains(event.relatedTarget) && !active.matches(':hover')) hide();
    });
    document.addEventListener('keydown', event => { if (event.key === 'Escape') hide(); });
    document.addEventListener('scroll', hide, true);
    window.addEventListener('resize', hide);
  }

  function renderHistory() {
    const section = document.getElementById('org-performance');
    const history = buildHistory();
    if (!section) return;
    if (!history || !history.reigns.length) {
      document.getElementById('history-dominance').innerHTML = '<p class="history-empty">History data is unavailable.</p>';
      return;
    }
    document.getElementById('history-period').textContent =
      `Indie model leads across five size categories, ${formatDate(history.start, true)} – ${formatDate(history.asOf, true)}.`;
    renderFrontier(history);
    const start = calendarTime(history.start);
    const span = calendarTime(history.endExclusive) - start;
    const position = reign => ({
      left: (calendarTime(reign.start) - start) / span * 100,
      width: (calendarTime(reign.endExclusive) - calendarTime(reign.start)) / span * 100
    });
    const reignTitle = reign => `${reign.model} · ${lab(reign.org).name} · ${reign.category}: ${reign.days} ${reign.days === 1 ? 'day' : 'days'}, ${formatDate(reign.start, true)} – ${formatDate(lastIncluded(reign.endExclusive), true)}`;

    const dominance = history.classes.map(category => {
      const reigns = history.reigns.filter(reign => reign.category === category.key);
      return `<div class="history-dominance-row">
        <span class="history-category-label">${escapeHtml(category.key)}</span>
        <div class="history-dominance-track" role="group" aria-label="${escapeHtml(category.key)} leadership over time">${reigns.map(reign => {
          const { left, width } = position(reign);
          const organization = lab(reign.org);
          const description = escapeHtml(reignTitle(reign));
          return `<a class="history-dominance-segment${width >= 8 ? ' has-label' : ''}" data-history-reign="${history.reigns.indexOf(reign)}" href="${escapeHtml(reign.card)}" target="_blank" rel="noopener noreferrer" aria-label="${description}" style="left:${left}%;width:max(1px, calc(${width}% - 1px));--org-color:${escapeHtml(organization.chartBorder)}">
            ${width >= 8 ? `<span class="history-segment-model">${escapeHtml(reign.model)}</span>` : ''}
          </a>`;
        }).join('')}</div>
      </div>`;
    }).join('');
    const labLegend = organizationLegend(history.labs.slice(0, 10).map(row => row.org));
    document.getElementById('history-dominance').innerHTML = `<div class="history-dominance-rows">${dominance}</div>` + dateAxis(history, 'history-timeline-axis') + labLegend;

    const labs = history.labs.slice(0, 10);
    const maxDays = Math.ceil(labs[0].days / 50) * 50;
    const labChart = labs.map(row => {
      const organization = lab(row.org);
      return `<div class="history-lab-row">
        ${organization.url ? `<a class="history-lab-label" data-history-lab="${escapeHtml(row.org)}" href="${escapeHtml(organization.url)}" target="_blank" rel="noopener noreferrer">${escapeHtml(organization.name)}</a>` : `<span class="history-lab-label" data-history-lab="${escapeHtml(row.org)}">${escapeHtml(organization.name)}</span>`}
        <div class="history-lab-track" role="group" aria-label="${escapeHtml(organization.name)}: ${row.days} class-days">${history.classes.map(category => {
          const days = row.categories[category.key] || 0;
          if (!days) return '';
          const description = `${organization.name} · ${category.key}: ${days} days`;
          return `<span class="history-lab-segment" data-history-lab="${escapeHtml(row.org)}" data-history-category="${escapeHtml(category.key)}" tabindex="0" role="img" aria-label="${escapeHtml(description)}" style="width:${days / maxDays * 100}%;--history-bar-color:${category.color}"></span>`;
        }).join('')}<span class="history-day-total history-lab-total" style="left:${row.days / maxDays * 100}%">${row.days}d</span></div>
      </div>`;
    }).join('');
    const labAxis = `<div class="history-date-axis history-lab-axis" aria-hidden="true">${[0, .2, .4, .6, .8, 1].map(fraction =>
      `<span class="history-tick" style="left:${fraction * 100}%">${Math.round(maxDays * fraction)}</span>`
    ).join('')}</div>`;
    document.getElementById('history-labs').innerHTML = labChart + labAxis + categoryLegend(history.classes);

    const models = modelTotals(history).slice(0, 10);
    const maxModelDays = Math.ceil(models[0].days / 10) * 10;
    const modelChart = models.map((model, index) => {
      const entry = currentModel(model);
      return `<div class="history-model-row">
        <a class="history-model-label" data-history-model="${index}" href="${escapeHtml(entry?.links.card || model.card)}" target="_blank" rel="noopener noreferrer">${escapeHtml(model.model)}</a>
        <div class="history-model-bar-row"><div class="history-model-track" role="group" aria-label="${escapeHtml(model.model)}: ${model.days} class-days"><span class="history-model-segment" data-history-model="${index}" tabindex="0" role="img" aria-label="${escapeHtml(model.model)}: ${model.days} class-days" style="width:${model.days / maxModelDays * 100}%;--history-bar-color:${escapeHtml(lab(model.org).chartBorder)}"></span><span class="history-day-total history-lab-total" style="left:${model.days / maxModelDays * 100}%">${model.days}d</span></div></div>
      </div>`;
    }).join('');
    const modelAxis = `<div class="history-date-axis history-model-axis" aria-hidden="true">${[0, .2, .4, .6, .8, 1].map(fraction => `<span class="history-tick" style="left:${fraction * 100}%">${Math.round(maxModelDays * fraction)}</span>`).join('')}</div>`;
    document.getElementById('history-models').innerHTML = modelChart + modelAxis + organizationLegend(models.map(model => model.org));
    installHistoryTooltip(section, history, models);
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', renderHistory);
  else renderHistory();
})();