'segunda','Ter'=>'terça','Qua'=>'quarta','Qui'=>'quinta','Sex'=>'sexta','Sab'=>'sábado'];
$rows = $data ?? [];
$week_values = array_values($week_day);
$today_map = [1=>'segunda', 2=>'terça', 3=>'quarta', 4=>'quinta', 5=>'sexta', 6=>'sábado'];
$default_day = $today_map[(int) date('N')] ?? null;
if (!in_array($default_day, $week_values, true)) { $default_day = $week_values[0]; }
// Distinct start times → grid rows; days → columns. Split Manhã (<12:00) / Tarde.
$slot_times = [];
foreach ($rows as $d) { $slot_times[$d['hora_inicio']] = true; }
ksort($slot_times);
$slot_times = array_keys($slot_times);
$morning = $afternoon = [];
foreach ($slot_times as $t) { if ((int) substr($t, 0, 2) < 12) { $morning[] = $t; } else { $afternoon[] = $t; } }
$row_of = []; $sections = []; $gr = 2; // row 1 = day headers
if ($morning) { $sections[] = ['Manhã', $gr++]; foreach ($morning as $t) { $row_of[$t] = $gr++; } }
if ($afternoon) { $sections[] = ['Tarde', $gr++]; foreach ($afternoon as $t) { $row_of[$t] = $gr++; } }
$total_rows = $gr - 1;
$grid = [];
foreach ($rows as $d) { $grid[$d['dia_semana']][$d['hora_inicio']][] = $d; }
?>
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