define('OLG_BLUE', '#81a8e4');
define('OLG_BLUE_INK', '#3f6cae');
define('OLG_ORANGE', '#e4a881');
define('OLG_ORANGE_INK', '#b8672f');
define('OLG_INK', '#171717');
define('OLG_INK_SOFT', '#4a4a4a');
define('OLG_LINE', '#e9e6e1');
define('OLG_SANS', 'Mulish, system-ui, sans-serif');

function olg_esc($s) { return htmlspecialchars((string)$s, ENT_QUOTES, 'UTF-8'); }

function olg_is_numeric_cell($s) {
  return (bool) preg_match('/^\$?\d+(\.\d+)?\s*(to|-|\x{2013})?\s*\$?\d*(\.\d+)?\s*(lb|kg|months?|years?|hours?|hrs?|min|minutes?|cups?|kcal|calories?|days?|weeks?|%|x)?\.?$/iu', trim($s));
}

function olg_parse_numeric($s) {
  preg_match_all('/\d+\.?\d*/', $s, $m);
  if (empty($m[0])) return null;
  $nums = array_map('floatval', $m[0]);
  return [$nums[0], end($nums)];
}

function olg_wrap_lines($s, $width, $max_lines = 2) {
  $wrapped = wordwrap($s, $width, "\n", false);
  $lines = explode("\n", $wrapped);
  return array_slice($lines, 0, $max_lines);
}

function olg_svg_line_chart($labels, $series, $title, $ylabel, $aria_label, $width = 640, $height = 460) {
  $pad_l = 90; $pad_r = 40; $pad_t = 80; $pad_b = 70;
  $pw = $width - $pad_l - $pad_r; $ph = $height - $pad_t - $pad_b;
  $all_vals = [];
  foreach ($series as $pairs) { foreach ($pairs as $p) { $all_vals[] = $p[0]; $all_vals[] = $p[1]; } }
  $ymin = min($all_vals); $ymax = max($all_vals);
  $yrange = ($ymax - $ymin) ?: 1;
  $ymin -= $yrange * 0.08; $ymax += $yrange * 0.08;
  $n = count($labels);
  $X = function($i) use ($pad_l, $pw, $n) { return $pad_l + ($pw * $i / max($n - 1, 1)); };
  $Y = function($v) use ($pad_t, $ph, $ymin, $ymax) { return $pad_t + $ph - ($ph * ($v - $ymin) / ($ymax - $ymin)); };
  $colors = [[OLG_BLUE_INK, OLG_BLUE], [OLG_ORANGE_INK, OLG_ORANGE]];
  $parts = [];
  $parts[] = '<svg role="img" aria-label="' . olg_esc($aria_label) . '" viewBox="0 0 ' . $width . ' ' . $height . '" xmlns="http://www.w3.org/2000/svg" font-family="' . OLG_SANS . '">';
  $parts[] = '<text x="' . ($width/2) . '" y="38" text-anchor="middle" font-size="26" font-weight="700" fill="' . OLG_INK . '">' . olg_esc($title) . '</text>';
  $steps = 5;
  for ($i = 0; $i <= $steps; $i++) {
    $v = $ymin + ($ymax - $ymin) * $i / $steps;
    $y = $Y($v);
    $yf = number_format($y, 1, '.', '');
    $parts[] = '<line x1="' . $pad_l . '" y1="' . $yf . '" x2="' . ($width - $pad_r) . '" y2="' . $yf . '" stroke="' . OLG_LINE . '" stroke-width="1"/>';
    $parts[] = '<text x="' . ($pad_l - 12) . '" y="' . number_format($y + 6, 1, '.', '') . '" text-anchor="end" font-size="19" fill="' . OLG_INK_SOFT . '">' . round($v) . '</text>';
  }
  $parts[] = '<text x="24" y="' . number_format($pad_t + $ph/2, 1, '.', '') . '" text-anchor="middle" font-size="18" fill="' . OLG_INK_SOFT . '" transform="rotate(-90 24 ' . number_format($pad_t + $ph/2, 1, '.', '') . ')">' . olg_esc($ylabel) . '</text>';
  foreach ($labels as $i => $lab) {
    $parts[] = '<text x="' . number_format($X($i), 1, '.', '') . '" y="' . ($height - 20) . '" text-anchor="middle" font-size="17" fill="' . OLG_INK_SOFT . '">' . olg_esc($lab) . '</text>';
  }
  $si = 0;
  foreach ($series as $name => $pairs) {
    [$line_c, $fill_c] = $colors[$si % count($colors)];
    $lo_pts = []; $hi_pts = [];
    foreach ($pairs as $i => $p) { $lo_pts[] = number_format($X($i),1,'.','') . ',' . number_format($Y($p[0]),1,'.',''); }
    foreach (array_reverse($pairs, true) as $i => $p) { $hi_pts[] = number_format($X($i),1,'.','') . ',' . number_format($Y($p[1]),1,'.',''); }
    $parts[] = '<polygon points="' . implode(' ', $lo_pts) . ' ' . implode(' ', $hi_pts) . '" fill="' . $fill_c . '" opacity="0.22"/>';
    $mid_pts = [];
    foreach ($pairs as $i => $p) { $mid_pts[] = number_format($X($i),1,'.','') . ',' . number_format($Y(($p[0]+$p[1])/2),1,'.',''); }
    $parts[] = '<polyline points="' . implode(' ', $mid_pts) . '" fill="none" stroke="' . $line_c . '" stroke-width="3.2"/>';
    foreach ($pairs as $i => $p) {
      $parts[] = '<circle cx="' . number_format($X($i),1,'.','') . '" cy="' . number_format($Y(($p[0]+$p[1])/2),1,'.','') . '" r="5" fill="' . $line_c . '"/>';
    }
    $ly = $pad_t + 18 + $si * 30;
    $parts[] = '<line x1="' . ($pad_l+12) . '" y1="' . $ly . '" x2="' . ($pad_l+40) . '" y2="' . $ly . '" stroke="' . $line_c . '" stroke-width="3.2"/>';
    $parts[] = '<text x="' . ($pad_l+50) . '" y="' . ($ly+6) . '" font-size="18" fill="' . OLG_INK_SOFT . '">' . olg_esc($name) . '</text>';
    $si++;
  }
  $parts[] = '</svg>';
  return implode('', $parts);
}

function olg_svg_key_points_card($rows, $title, $aria_label, $width = 680) {
  $row_specs = [];
  foreach ($rows as [$label, $detail]) { $row_specs[] = [$label, olg_wrap_lines($detail, 62, 2)]; }
  $row_h_base = 46; $line_h = 26; $row_gap = 24; $y = 60;
  $row_ys = [];
  foreach ($row_specs as [$label, $lines]) {
    $row_ys[] = $y;
    $y += $row_h_base + $line_h * max(count($lines) - 1, 0) + $row_gap;
  }
  $height = $y + 12;
  $parts = [];
  $parts[] = '<svg role="img" aria-label="' . olg_esc($aria_label) . '" viewBox="0 0 ' . $width . ' ' . $height . '" xmlns="http://www.w3.org/2000/svg" font-family="' . OLG_SANS . '">';
  $parts[] = '<text x="20" y="34" font-size="26" font-weight="700" fill="' . OLG_INK . '">' . olg_esc($title) . '</text>';
  foreach ($row_specs as $idx => [$label, $lines]) {
    $ry = $row_ys[$idx];
    $parts[] = '<circle cx="24" cy="' . ($ry-6) . '" r="5.5" fill="' . OLG_BLUE_INK . '"/>';
    $parts[] = '<text x="42" y="' . $ry . '" font-size="20" font-weight="700" fill="' . OLG_BLUE_INK . '">' . olg_esc($label) . '</text>';
    foreach ($lines as $li => $line) {
      $parts[] = '<text x="42" y="' . ($ry + 26 + $li*$line_h) . '" font-size="18" fill="' . OLG_INK_SOFT . '">' . olg_esc($line) . '</text>';
    }
    $div_y = $ry + $row_h_base + $line_h * max(count($lines)-1,0) + $row_gap - 14;
    $parts[] = '<line x1="20" y1="' . $div_y . '" x2="' . ($width-20) . '" y2="' . $div_y . '" stroke="' . OLG_LINE . '" stroke-width="1"/>';
  }
  $parts[] = '</svg>';
  return implode('', $parts);
}

function olg_svg_comparison_card($col_a_name, $col_b_name, $rows, $title, $aria_label, $width = 680) {
  $row_h = 62; $y0 = 108;
  $height = $y0 + $row_h * count($rows) + 20;
  $col_a_x = $width * 0.42; $col_b_x = $width * 0.74;
  $parts = [];
  $parts[] = '<svg role="img" aria-label="' . olg_esc($aria_label) . '" viewBox="0 0 ' . $width . ' ' . $height . '" xmlns="http://www.w3.org/2000/svg" font-family="' . OLG_SANS . '">';
  $parts[] = '<text x="' . ($width/2) . '" y="34" text-anchor="middle" font-size="24" font-weight="700" fill="' . OLG_INK . '">' . olg_esc($title) . '</text>';
  $parts[] = '<text x="' . number_format($col_a_x,1,'.','') . '" y="66" text-anchor="middle" font-size="19" font-weight="700" fill="' . OLG_BLUE_INK . '">' . olg_esc($col_a_name) . '</text>';
  $parts[] = '<text x="' . number_format($col_b_x,1,'.','') . '" y="66" text-anchor="middle" font-size="19" font-weight="700" fill="' . OLG_ORANGE_INK . '">' . olg_esc($col_b_name) . '</text>';
  $parts[] = '<line x1="20" y1="78" x2="' . ($width-20) . '" y2="78" stroke="' . OLG_INK . '" stroke-width="1.5"/>';
  foreach ($rows as $i => [$label, $a_val, $b_val]) {
    $ry = $y0 + $i * $row_h;
    $a_lines = olg_wrap_lines($a_val, 20, 2); $b_lines = olg_wrap_lines($b_val, 20, 2);
    $n_lines = max(count($a_lines), count($b_lines), 1);
    $label_y = $ry + 6 + ($n_lines-1)*10;
    $parts[] = '<text x="20" y="' . $label_y . '" font-size="17" fill="' . OLG_INK_SOFT . '">' . olg_esc($label) . '</text>';
    $val_start_y = $ry + 6 - ($n_lines-1)*10;
    foreach ($a_lines as $li => $line) {
      $parts[] = '<text x="' . number_format($col_a_x,1,'.','') . '" y="' . ($val_start_y+$li*22) . '" text-anchor="middle" font-size="17" fill="' . OLG_INK . '">' . olg_esc($line) . '</text>';
    }
    foreach ($b_lines as $li => $line) {
      $parts[] = '<text x="' . number_format($col_b_x,1,'.','') . '" y="' . ($val_start_y+$li*22) . '" text-anchor="middle" font-size="17" fill="' . OLG_INK . '">' . olg_esc($line) . '</text>';
    }
    if ($i < count($rows)-1) {
      $parts[] = '<line x1="20" y1="' . ($ry+$row_h-12) . '" x2="' . ($width-20) . '" y2="' . ($ry+$row_h-12) . '" stroke="' . OLG_LINE . '" stroke-width="1"/>';
    }
  }
  $parts[] = '</svg>';
  return implode('', $parts);
}

function olg_auto_generate_compact($table_headers, $table_rows, $title, $category = null) {
  $numeric_cols = [];
  for ($ci = 1; $ci < count($table_headers); $ci++) {
    $col_cells = [];
    foreach ($table_rows as $row) { if (isset($row[$ci])) $col_cells[] = $row[$ci]; }
    if (empty($col_cells)) continue;
    $numeric_count = 0;
    foreach ($col_cells as $c) { if (olg_is_numeric_cell($c)) $numeric_count++; }
    if ($numeric_count / count($col_cells) >= 0.85) $numeric_cols[] = $ci;
  }

  if (!empty($numeric_cols)) {
    $labels = array_map(fn($r) => $r[0], $table_rows);
    $series = [];
    foreach ($numeric_cols as $ci) {
      $parsed = [];
      $ok = true;
      foreach ($table_rows as $row) {
        $p = isset($row[$ci]) ? olg_parse_numeric($row[$ci]) : null;
        if ($p === null) { $ok = false; break; }
        $parsed[] = $p;
      }
      if ($ok) $series[$table_headers[$ci]] = $parsed;
    }
    if (!empty($series)) {
      $names = array_keys($series);
      if (count($names) > 1) {
        $wsets = array_map(fn($n) => array_filter(preg_split('/\W+/', strtolower($n))), $names);
        $common = array_shift($wsets);
        foreach ($wsets as $ws) { $common = array_intersect($common, $ws); }
        $ylabel = !empty($common) ? ucfirst(reset($common)) : 'Value';
      } else {
        $ylabel = $names[0];
      }
      $unit = null;
      foreach ($table_rows as $row) {
        foreach ($numeric_cols as $ci) {
          if (isset($row[$ci]) && preg_match('/\b(lb|kg|months?|years?|hours?|days?|weeks?|cups?|kcal)\b/i', $row[$ci], $m)) { $unit = strtolower($m[1]); break 2; }
        }
      }
      if ($unit && stripos($ylabel, $unit) === false) { $ylabel = "$ylabel ($unit)"; }
      $aria = "Chart showing $title";
      $svg = olg_svg_line_chart($labels, $series, $title, $ylabel, $aria);
      return ['chart', $svg, ['series'=>$names]];
    }
  }

  if (count($table_headers) === 3 && $category === 'Dog Breed Comparisons') {
    $rows = array_map(fn($r) => [$r[0], $r[1] ?? '', $r[2] ?? ''], $table_rows);
    $aria = "Comparison chart: $title";
    $svg = olg_svg_comparison_card($table_headers[1], $table_headers[2], $rows, $title, $aria);
    return ['comparison_card', $svg, ['row_count'=>count($rows)]];
  }

  $rows_for_card = array_map(fn($r) => [$r[0], count($r) > 1 ? implode(' \xc2\xb7 ', array_slice($r,1)) : ''], $table_rows);
  $aria = "Key points summary: $title";
  $svg = olg_svg_key_points_card($rows_for_card, $title, $aria);
  return ['card', $svg, ['row_count'=>count($rows_for_card)]];
}

function olg_citation_for_category($category, $title) {
  $t = strtolower($title);
  if ($category === 'Dog Interactive Tools') {
    if (strpos($t,'age') !== false || strpos($t,'human year') !== false) { $category = '__senior__'; }
    elseif (strpos($t,'joint') !== false) { $category = '__joint__'; }
    elseif (strpos($t,'feed') !== false || strpos($t,'food') !== false || strpos($t,'portion') !== false) { $category = '__feeding__'; }
    else { $category = '__growth__'; }
  }
  $map = [
    'Dog Breed Growth' => '__growth__',
    'Dog Puppy Essentials' => '__growth__',
    'Dog Exercise & Safety' => '__growth__',
    'Dog Exercise &amp; Safety' => '__growth__',
    'Dog Breed Comparisons' => '__growth__',
    'Dog Breed Traits & Behaviour' => '__growth__',
    'Dog Breed Traits &amp; Behaviour' => '__growth__',
    'Big Dog Facts' => '__growth__',
    'Dog Feeding & Nutrition' => '__feeding__',
    'Dog Feeding &amp; Nutrition' => '__feeding__',
    'Dog Joint & Mobility Health' => '__joint__',
    'Dog Joint & Mobility' => '__joint__',
    'Dog Joint &amp; Mobility' => '__joint__',
    'Dog Joint &amp; Mobility Health' => '__joint__',
    'Senior Big Dog Care' => '__senior__',
  ];
  $key = $map[$category] ?? $category;
  if (!in_array($key, ['__growth__','__feeding__','__joint__','__senior__'])) { $key = '__growth__'; }
  $sources = [
    '__growth__' => "The American Kennel Club's Chief Veterinary Officer, Dr. Jerry Klein, DVM, has written extensively on the slower growth and development timeline of large and giant breeds. Read more from the <a href=\"https://www.akc.org/expert-advice/puppy-information/how-to-care-for-your-large-breed-dog/\" target=\"_blank\" rel=\"noopener noreferrer\">AKC's guidance on caring for large-breed dogs</a>.",
    '__feeding__' => "The World Small Animal Veterinary Association's Global Nutrition Committee publishes evidence-based guidance for evaluating dog food and feeding practices. Read more from the <a href=\"https://wsava.org/global-guidelines/global-nutrition-guidelines/\" target=\"_blank\" rel=\"noopener noreferrer\">WSAVA Global Nutrition Guidelines</a>.",
    '__joint__' => "Cornell University's College of Veterinary Medicine covers how growth rate, nutrition, and exercise interact with joint development in large breed dogs. Read more from <a href=\"https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/canine-hip-dysplasia-chd\" target=\"_blank\" rel=\"noopener noreferrer\">Cornell's canine hip dysplasia overview</a>.",
    '__senior__' => "The American Veterinary Medical Association notes that larger breeds are generally considered senior earlier than small breeds, given their shorter typical lifespans. Read more from the <a href=\"https://www.avma.org/resources-tools/pet-owners/petcare/senior-pets\" target=\"_blank\" rel=\"noopener noreferrer\">AVMA's guidance on caring for senior pets</a>.",
  ];
  return '<p class="olg-citation">' . $sources[$key] . '</p>';
}