<?php
require_once('include/headscript.php');

/**
 * Propagazione di una classe sul calendario (serviceschedule).
 * Genera le occorrenze settimanali tra data inizio e data fine,
 * saltando le date già presenti e i giorni di pausa (dayoff).
 *
 * Script di sola logica: nessun output, redirect finale.
 */

$pdo = DBHandlerSelect::getInstance()->getConnection();

// --- Input dal form (con default vuoti) ---
$propagatestartdate = trim($_POST['propagatestartdate'] ?? '');
$propagateenddate   = trim($_POST['propagateenddate'] ?? '');
$idservice          = isset($_POST['idservice']) ? (int) $_POST['idservice'] : 0;
$dayclass           = trim($_POST['dayclass'] ?? '');
$timeclass          = trim($_POST['timeclass'] ?? '');
$durationtime       = isset($_POST['durationtime']) ? (float) $_POST['durationtime'] : 0;

// --- Mappa giorni settimana ---
$daysOfWeek = [
  "Sunday" => 0,
  "Monday" => 1,
  "Tuesday" => 2,
  "Wednesday" => 3,
  "Thursday" => 4,
  "Friday" => 5,
  "Saturday" => 6,
];

// --- Validazione minima: senza questi non si procede ---
if (
  $propagatestartdate === '' || $propagateenddate === ''
  || $idservice <= 0 || !isset($daysOfWeek[$dayclass])
) {
  header('Location: admin-services.php?message=error');
  exit;
}

// --- Calcolo della prima occorrenza del giorno desiderato ---
$startTs = strtotime($propagatestartdate);
$endTs   = strtotime($propagateenddate);

if ($startTs === false || $endTs === false) {
  header('Location: admin-services.php?message=error');
  exit;
}

$dayOfWeekStart  = (int) date('w', $startTs);
$desiredDayValue = $daysOfWeek[$dayclass];
$daysUntilNext   = ($desiredDayValue + 7 - $dayOfWeekStart) % 7;

$currentTs = $startTs + $daysUntilNext * 86400;
$dateEnd   = date('Y-m-d', $endTs);

// --- Statement preparati una sola volta e riusati nel loop ---
$checkClass = $pdo->prepare(
  "SELECT idserviceschedule FROM serviceschedule
     WHERE dateschedule = :dateschedule AND idservice = :idservice
     LIMIT 1"
);
$checkDayoff = $pdo->prepare(
  "SELECT iddayoff FROM dayoff WHERE dayoffdate = :dayoffdate LIMIT 1"
);
$insertSchedule = $pdo->prepare(
  "INSERT INTO serviceschedule (idservice, dateschedule, scheduleday, startingtime, durationtime)
     VALUES (:idservice, :dateschedule, :scheduleday, :startingtime, :durationtime)"
);

$inserted = 0;

while (date('Y-m-d', $currentTs) <= $dateEnd) {
  $currentDate      = date('Y-m-d', $currentTs);
  $datetimeSchedule = $currentDate . ' ' . $timeclass;

  // La data è già schedulata per questo servizio?
  $checkClass->execute([
    ':dateschedule' => $datetimeSchedule,
    ':idservice'    => $idservice,
  ]);
  $alreadyScheduled = $checkClass->fetchColumn();

  // È un giorno di pausa?
  $checkDayoff->execute([':dayoffdate' => $currentDate]);
  $isDayoff = $checkDayoff->fetchColumn();

  if (!$alreadyScheduled && !$isDayoff) {
    $insertSchedule->execute([
      ':idservice'    => $idservice,
      ':dateschedule' => $datetimeSchedule,
      ':scheduleday'  => $dayclass,
      ':startingtime' => $timeclass,
      ':durationtime' => $durationtime,
    ]);
    $inserted++;
  }

  // Avanza di 7 giorni
  $currentTs = strtotime('+7 day', $currentTs);
}

header('Location: admin-services.php?message=success');
exit;